Description:AN AUDIO SYSTEM WITH PULSE WIDTH MODULATION BASED COMMUNICATION AND A METHOD THEREOF

TECHNICAL FIELD
[0001] The present disclosure, in general, relates to audio system and method performed by audio system of a vehicle. The present disclosure, particularly, relates to an audio system with pulse width modulation based communication and a method thereof.

BACKGROUND
[0002] Audio systems are usually provided in vehicles for entertainment and information purposes. In-vehicle entertainment has come a long way, from basic AM radio receiver with a single speaker to complex electronic systems reproducing music and other entertainment from both radio signals and recorded formats. Many available audio systems today can play music from a staggering array of audio sources like radio, CD, portable music players like the iPod, USB flash drives, SD cards, Bluetooth audio and hard-disk drives.
[0003] Nowadays, automakers use original equipment manufacturer systems. The audio system comprises a main system, an external amplifier and one or more speakers, sub-woofers and tweeters. The main system includes an infotainment system or a CD player or a stereo. The main system act as an interface. The main system is configured to transmit sound signals to the external amplifier. The external amplifier is configured to amplify the sound signals received from the main unit. The external amplifier is further configured to transmit the amplified sound signals to the one or more speakers, sub-woofers and tweeters.
[0004] For communication between the main system, the external amplifier and one or more speakers, sub-woofers and tweeters, a communication network is needed.
[0005] The existing audio systems, are equipped with CAN and LIN interfaces which uses pre-defined protocols to transmit and receive signals. For sound signal transmission, A2B communication protocol is used. The protocols need transmitters and receivers. Requirement of additional components in the audio system makes the system expansive and bulky.
[0006] Further, noise disruption is one of the major phenomenon disturbing the internal communication between the components of the audio system.
[0007] Accordingly, there is a need for an audio system and a method performed by the audio system through which noise disruption could be prevented.

SUMMARY
[0008] This summary is provided to introduce concepts related to an audio system with pulse width modulation based communication and a method thereof. The concepts are further described below in the detailed description. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter.
[0009] The present subject matter relates to a method performed by an audio system with pulse width modulation based communication. The method comprises transmitting, by a main unit, sound signals S1 to an external amplifier; generating, by a main digital signal processor of the main unit, encoded data signals S2 based on a first data D1, a second data D2, a third data D3 and a fourth data D4; transmitting, by the main digital signal processor of the main unit, the generated encoded data signals S2 in the form of pulse width modulation to the external amplifier; receiving, by a digital signal processor of the external amplifier, the transmitted encoded data signals S2 in the form of pulse width modulation signals and the sound signals S1; decoding, by the digital signal processor of the external amplifier, the received encoded data signals S2 and retrieving the first data D1, the second data D2, the third data D3 and the fourth data D4; amplifying, by a power amplifier of the external amplifier, the received sound signals S1 based on the retrieved first data D1, second data D2, third data D3 and fourth data D4; and transmitting, by the power amplifier of the external amplifier, the amplified sound signals S1 to one or more speakers and/or one or more sub-woofers and/or one or more tweeters based on the frequency of the amplified sound signals S1.
[0010] In an aspect, the first data D1 is frequency of sound, the second data D2 is phase of sound, the third data D3 is sound pressure level and the fourth data D4 is user input at the main unit.
[0011] In an aspect, the fourth data D4 includes at least one of: low ranges gain demand and phase in the range 20 Hz to 120 Hz; low-mid gain demand and phase in the range 120 Hz to 5 KHz; high-mid gain demand and phase in the range up to 5 KHz; high node 1 gain demand and phase in the range 5 KHz to 15 KHz; and high node 2 gain demand and phase in the range 15 KHz to 20 KHz.
[0012] In an aspect, the main digital signal processor of the main unit encodes and transmits low frequency ranges to the external amplifier by manipulating data signals S2 in the form of pulse width modulation signal with 1 milliseconds changeover.
[0013] In an aspect, the main digital signal processor of the main unit encodes and transmits low frequency ranges to the external amplifier by manipulating data signals S2 in the form of pulse width modulation of 5 volts.
[0014] In an aspect, the main digital signal processor encodes and transmits high frequency ranges to the external amplifier by manipulating the data signals S2 in the form of pulse width modulation with 5 milliseconds changeover.
[0015] In an aspect, the digital signal processor encodes and transmits high frequency ranges to the external amplifier by manipulating the data signals S2 in the form of pulse width modulation of 10 volts.
[0016] In an aspect, the communication between the main unit (101) and the external amplifier (102) is started by performing handshake process which transmits pulse width modulated initiation signals of specific voltage and time period.
[0017] In an aspect, the amplified sound signals S1 with frequency in the range 20 Hz to 120 Hz is sent to one or more sub-woofers by the power amplifier of the external amplifier.
[0018] In an aspect, the amplified sound signals S1 with frequency in the range 120 Hz to 5 KHz is sent to one or more speakers by the power amplifier of the external amplifier.
[0019] In an aspect, the amplifier sound signals S1 with frequency in the range 5 KHz to 20 KHz is sent to one or more tweeters by the power amplifier of the external amplifier.
[0020] The present subject matter further relates to an audio system with pulse width modulation based communication. The audio system comprises a main unit, an external amplifier and one or more speakers, sub-woofers and tweeters. The main unit is configured to transmit sound signals S1 and data signals S2. The main unit has a main digital signal processor capable of encoding and transmitting data signals S2, in the form of pulse width modulation, based on a first data D1, a second data D2, a third data D3 and a fourth data D4. The external amplifier is operatively connected to the main unit (101) and is configured to receive sound signals S1 and encoded data signals S2 transmitted by the main unit. The external amplifier has a digital signal d processor capable of receiving and decoding encoded data signals S2 received in the form of pulse width modulation signals to retrieve the first data D1, the second data D2, the third data D3 and the fourth data D4 and a power amplifier to amplify and transmit sound signals S1 based on the retrieved first data D1, second data D2, third data D3 and fourth data D4. The one or more speakers, sub-woofers and tweeters are each operatively connected to the external amplifier. The power amplifier of the external amplifier is configured to transmit amplified sound signals S1 based on the frequency of the amplified sound signals S1.
[0021] To further understand the characteristics and technical contents of the present subject matter, a description relating thereto will be made with reference to the accompanying drawings. However, the drawings are illustrative only but not used to limit the scope of the present subject matter.
[0022] Various objects, features, aspects, and advantages of the inventive subject matter will become more apparent from the following detailed description of preferred embodiments, along with the accompanying drawing figures in which like numerals represent like components.

BRIEF DESCRIPTION OF FIGURES
[0023] The illustrated embodiments of the present disclosure will be best understood by reference to the drawings, wherein like parts are designated by like numerals throughout. The following description is intended only by way of example, and simply illustrates certain selected embodiments of devices, systems, and processes that are consistent with the subject matter as claimed herein, wherein:
[0024] FIG. 1 illustrates an exemplary audio system that can be utilized to implement one or more exemplary embodiments of the present disclosure;
[0025] FIG. 2 illustrates a data band depicting content of data signals in accordance with one or more exemplary embodiments of the present disclosure.;
[0026] FIG. 3 illustrates a part of pulse width modulated data signal in accordance with one or more exemplary embodiments of the present disclosure;
[0027] FIG. 4 illustrates distribution of amplified sound signals based on frequency in accordance with one or more exemplary embodiments of the present disclosure.;
[0028] FIG. 5 illustrates flow chart of method performed by audio system that can be utilized to implement one or more exemplary embodiments of the present disclosure; and
[0029] FIG. 6 illustrates an encoding data signal in accordance with an exemplary embodiments of the present disclosure.
[0030] The figures depict embodiments of the present subject matter for the purposes of illustration only. A person skilled in the art will easily recognize from the following description that alternative embodiments of the structures and methods illustrated herein may be employed without departing from the principles of the disclosure described herein.

DETAILED DESCRIPTION
[0031] A few aspects of the present disclosure are explained in detail below with reference to the various figures. Example implementations are described to illustrate the disclosed subject matter, not to limit its scope, which is defined by the claims. Those of ordinary skill in the art will recognize a number of equivalent variations of the various features provided in the description that follows.

EXEMPLARY IMPLEMENTATIONS
[0032] While the present disclosure may be embodied in various forms, there are shown in the drawings, and will hereinafter be described, some exemplary and non-limiting embodiments, with the understanding that the present disclosure is to be considered an exemplification of the invention and is not intended to limit the invention to the specific embodiments illustrated. Not all of the depicted components described in this disclosure may be required, however, and some implementations may include additional, different, or fewer components from those expressly described in this disclosure. Variations in the arrangement and type of the components may be made without departing from the scope of the claims as set forth herein.
[0033] Some embodiments of this invention, illustrating all its features, will be discussed in detail.
[0034] The techniques described below may be implemented using one or more computer programs executed on (or executable by) a programmable computer including any combination of any number of the following: a processor, a sensor, a storage medium readable and/or writable by the processor (including for example volatile and non-volatile memory and/or storage elements), plurality of inputs units, plurality of output devices and networking devices.
[0035] The present disclosure provides audio system with pulse width modulation based communication and a method performed by the audio system. In this disclosure it is presumed that audio system is implemented in a vehicle. However, any person skilled in the art would appreciate that the audio system could be implemented in other environments also.
[0036] FIG. 1 illustrates an exemplary audio system that can be utilized to implement one or more exemplary embodiments of the present disclosure. The audio system 100 comprises a main unit 101, an external amplifier 102 and one or more speakers 103a, sub-woofers 103b and tweeters 103c. The main unit 101 and the external amplifier 102 is connected to an external power source (not shown). In an aspect, the external power source is battery of a vehicle. The main unit 101 includes an infotainment system or a CD player or a stereo. The main unit 101 is usually provided on the instrument panel of the vehicle. The main unit 101 is configured to transmit sound signals S1. The main unit acts as an interface to the user to input desirable data. The main unit 101 is further configured to generate and transmit data signals S2 to the external amplifier 102. The main unit 101 has a main digital signal processor 101a configured to encode data signals based on a first data D1, a second data D2, a third data D3 and a fourth data D4 inputted by the user through the main unit 101. Further, the main digital signal processor 101a is configured to transmit the encoded data signals S2 to the external amplifier 102 in the form of Pulse Width Modulation (PWM). The data signals S2 are encoded and transmitted in a way to prevent any noise disruption. The data could be parameters to manipulate sound signals S1. In an aspect, the first data D1 is frequency of sound, the second data D2 is phase of sound, the third data D3 is sound pressure level and the fourth data D4 is user input at the main unit 101. The fourth data D4 includes at least one of:
• D4-01: Low gain demand and phase in the range 20 Hz to 120 Hz
• D4-02: Low-mid gain demand and phase in the range 120 Hz to 5 KHz
• D4-03: High-mid gain demand and phase in the range up to 5 KHz
• D4-04: High node 1 gain demand and phase in the range 5 KHz to 15 KHz
• D4-05: High node 2 gain demand and phase in the range 15 KHz to 20 KHz.
[0037] The external amplifier 102 is operatively connected to the main unit 101. The external amplifier 102 is configured to receive sound signals S1 and data signals S2 transmitted by the main unit 101. The external amplifier 102 is configured to receive and decode the data signals S2 transmitted by the main unit 101 to retrieve the first data D1, the second data D2, the third data D3 and the fourth data D4. Further, the external amplifier 102 is configured to amplify the received sound signals S1 in accordance with the retrieved first data D1, the second data D2, the third data D3 and the fourth data D4. Accordingly, the external amplifier 102 comprises a digital signal processor 102a and a power amplifier 102b. The digital signal processor 102a of the external amplifier 102 is configured to receive the encoded data signals S2 transmitted by the main unit 101. Further, the digital signal processor 102a of the external amplifier 102 is configured to decode the encoded data signals S2 received in the form of Pulse Width Modulation and retrieve the first data D1, the second data D2, the third data D3 and the fourth data D4. The retrieved first data D1, second data D2, third data D3 and fourth data D4 are further processed in the power amplifier 102b to amplify the received sound signals S1. The power amplifier 102b is configured to amplify the sound signals S1 received from the main unit 101 based on the first data D1, the second data D2, the third data D3 and the fourth data D4 retrieved by the digital signal processor 102a.
[0038] The power amplifier 102b is operatively connected to the one or more speakers 103a, sub-woofers 103b and tweeters 103c. The power amplifier 102b is separately connected to the one or more speakers 103a and one or more sub-woofers 103b and one of more tweeters 103c. The power amplifier 102b is configured to transmit amplified sound signals S1 based on the frequency of the amplified sound signals S1.
[0039] FIG. 2 illustrates a data band depicting content of data signals in accordance with one or more exemplary embodiments of the present disclosure. The data band contains a first data D1 bit, a second data D2 bit, a third data D3 bit, a fourth data D4 bit with its sub-categorization bits D4-01, D4-02, D4-03, D4-04, D4-05, a data length bit and an end of data bit. The bits are encoded in the form of pulse width modulation shown in FIG. 3.
[0040] FIG. 3 illustrates a part of pulse width modulated data signal in accordance with one or more exemplary embodiments of the present disclosure. The encoding of the data in form of pulse width modulation is done based on two variables. In an aspect, the variables are voltage and time. The data is transmitted to the external amplifier 102 by manipulating voltage and time values based on the value of data to be transmitted. For instance, the low frequency ranges are transmitted to the external amplifier 102 by manipulating data signals D2 in the form of pulse width modulation signal with 1 milliseconds changeover of 5 volts. Further, the high frequency ranges are transmitted to the external amplifier 102 by manipulating data signals D2 in the form of pulse width modulation signal with 5 millisecond changeover of 10 volts. FIG. 3 only depicts a portion of data signals S2.
[0041] The data transmission between the main unit /Head Unit (101) and the external amplifier (102) is initiated by handshake process. Before encoding the data signals S2, handshake is performed. After data is encoded, at the end of the encoded data signals S2, check sum is performed. Check sum process ensures that the first data D1, the second data D2, the third data D3 and the fourth data D4 is received at the external amplifier (102) without any loss.
[0042] The handshake is performed to initiate transmission between the main unit (101) and the external amplifier (102). While performing handshake, the main digital signal processor (101a) transmits a pulse width modulated initiation signals of specific voltage and time period. The digital signal processor (102a) of the external amplifier (102) completes the handshake process by manipulating the initiation signal to different specific voltage and time period.
[0043] FIG. 4 illustrates distribution of amplified sound signals based on frequency in accordance with one or more exemplary embodiments of the present disclosure. It is desired that low frequency amplified sound signals should be played on sub-woofers 103b. Accordingly, the amplified sound signals S2 with frequency in the range 20 Hz to 120 Hz is transmitted to one or more sub-woofers 103b by the power amplifier 102b of the external amplifier 102.
[0044] It is desired that medium frequency amplified sound signals S2 should be played on speakers 103a. Accordingly, the amplified sound signals S2 with frequency in the range 120 Hz to 5 KHz is transmitted to one or more speakers 103a by the power amplifier 102b of the external amplifier 102.
[0045] It is desired that high frequency amplified sound signals S2 should be played on tweeters 103c. Accordingly, the amplified sound signals S2 with frequency in the range 5 KHz to 20 KHz is transmitted to one or more tweeters 103c by the power amplifier 102b of the external amplifier 102.
[0046] FIG. 5 illustrates flow chart of method performed by audio system that can be utilized to implement one or more exemplary embodiments of the present disclosure.
[0047] At step 502, the method 500 includes transmitting sound signals S1 to an external amplifier 102. The sound signals S1 are transmitted by the main unit 101 to the external amplifier 102. The main unit 101 includes an infotainment system or a CD player or a stereo. The sound signals S1 are transmitted by the main unit 101 to the external amplifier 102 for amplifying the sound signals S1. In addition to the sound signals S1, the data signals S2 are also transmitted by the main unit 101 containing data according to which the external amplifier 102 amplify the sound signals S1. However, there is possibility of noise disruption during transmission of the data signals S2. Accordingly, the data signals S2 are encoded before transmission.
[0048] At step 504, the method 500 includes generating encoded data signals. The data signals S2 are encoded before transmission to the external amplifier 102. This prevents noise disruption during transmission. The main unit 101 has a main digital signal processor 101a configured to encode the data signals S2 based on the first data D1, the second data D2, the third data D3 and the fourth data D2 inputted by the user through the main unit 101. The data signals S2 is encoded in a way to prevent any noise disruption. The data could be parameters to manipulate sound signals S1. In an aspect, the first data D1 is frequency of sound, the second data D2 is phase of sound, the third data D3 is sound pressure level and the fourth data D4 is user input at the main unit 101. The fourth data D4 includes at least one of:
• D4-01: Low gain demand and phase in the range 20 Hz to 120 Hz
• D4-02: Low-mid gain demand and phase in the range 120 Hz to 5 KHz
• D4-03: High-mid gain demand and phase in the range up to 5 KHz
• D4-04: High node 1 gain demand and phase in the range 5 KHz to 15 KHz
• D4-05: High node 2 gain demand and phase in the range 15 KHz to 20 KHz.
[0049] At step 506, the method 500 includes transmitting the generated encoded data signals S2 to the external amplifier 102. The main digital signal processor 101a is configured to transmit the encoded data signals S2 to the external amplifier 102 in the form of Pulse Width Modulation (PWM). The low frequency ranges are transmitted to the external amplifier 102 by manipulating data signals S2 in the form of pulse width modulation signal with 1 milliseconds changeover of 5 volts. Further, the high frequency ranges are transmitted to the external amplifier 102 by manipulating data signals S2 in the form of pulse width modulation signal with 5 millisecond changeover of 10 volts.
[0050] At step 508, the method 500 includes receiving the encoded data signals S2 and the sound signals S1. The encoded data signals S2 and the sound signals S1 transmitted by the main unit 101 is received by the external amplifier 102. The external amplifier 102 comprises a digital signal processor 102a and a power amplifier 102b. The digital signal processor 102a processes the received sound signals S1 and the encoded data signals S2.
[0051] At step 510, the method 500 includes decoding the received encoded data signals S2. Before, amplifying the sound signals S1 based on the data signals S2, it is necessary to decode the encoded data signals S2. The digital signal processor 102a of the external amplifier 102 is configured to decode the encoded data signals S2 received in the form of Pulse Width Modulation and retrieve the first data D1, the second data D2, the third data D3 and the fourth data D4.
[0052] At step 512, the method 500 includes amplifying the sound signals S1 based on the decoded data signals S2. The retrieved first data D1, second data D2, third data D3 and fourth data D4 are further processed in the power amplifier 102b to amplify the received sound signals S1. The power amplifier 102b is configured to amplify the sound signals S1 received from the main unit 101 based on the first data D1, the second data D2, the third data D3 and the fourth data D4 retrieved by the digital signal processor 102a of the external amplifier 102.
[0053] At step 514, the method 500 includes transmitting the amplified sound signals S1 to one or more speakers 103a, sub-woofers 103b and tweeters 103c. The power amplifier 102b is operatively connected to the one or more speakers 103a, sub-woofers 103b and tweeters 103c. The power amplifier 102b is separately connected to the one or more speakers 103a and one or more sub-woofers 103b and one of more tweeters 103c. The power amplifier 102b is configured to transmit amplified sound signals S1 based on the frequency of the amplified sound signals S1. The amplified sound signals S1 with frequency in the range 20 Hz to 120 Hz is transmitted to one or more sub-woofers 103b by the power amplifier 102b of the external amplifier 102. The amplified sound signals S1 with frequency in the range 120 Hz to 5 KHz is transmitted to one or more speakers 103a by the power amplifier of the external amplifier 102. The amplified sound signals S1 with frequency in the range 5 KHz to 20 KHz is transmitted to one or more tweeters 103c by the power amplifier 102b of the external amplifier 102.
WORKING EMBODIMENT
[0054] FIG. 6 illustrates an encoding data signal in accordance with an exemplary embodiments of the present disclosure.
[0055] The data signal shown is an exemplary data signal depicting pulse width modulated encoded data signal S2 based on the first data D1, the second data D2, the third data D3 and the fourth data D4. Before encoding the data signals S2, handshake is performed. After data is encoded, at the end of the encoded data signals S2, check sum is performed.
[0056] The handshake is performed to initiate transmission between the main unit (101) and the external amplifier (102). While performing handshake, the main digital signal processor (101a) transmits a pulse width modulated initiation signal of 5 volts of varying time. In the data signal S2, the volts are varied for 1 millisecond and 100 milliseconds. The digital signal processor (102a) of the external amplifier (102) completes the handshake process by manipulating the initiation signal to 5 volts for 50 milliseconds.
[0057] After handshake process, the encoded data signal S2 based on the first data D1, the second data D2, the third data D3 and the fourth data D4 is transmitted. Pulse width modulated data signals S2 conveying the first data D1, the second data D2, the third data D3 and the fourth data D4 is shown in FIG. 6.
[0058] The pulse width modulated encoded data signals S2 for first data D1 is of 10 volts of 50 milliseconds each. It signifies high frequency of sound. The pulse width modulated encoded data signal for second data D2 is of 5 volts of 50 milliseconds each. It signifies low frequency ranges. The pulse width modulated encoded data signal for third data D3 is of 5 volts of 50 milliseconds each. It signifies low frequency ranges. The pulse width modulated encoded data signal for fourth data D4 is of 5 volts of 50 milliseconds each. It signifies low frequency ranges.
[0059] The fourth data D4 further includes pulse width modulated encoded data signal of 10 volts of 50 milliseconds each. It signifier high frequency ranges. Afterwards check sum is performed.
[0060] The encoded data signal S2 is received on the digital signal processor (102a) of the external amplifier (102). The digital signal processor (102a) of the external amplifier (102) has an assembly of multiple filters to decode the encoded data signal S2 received from the main unit (101) and retrieve the first data D1, the second data D2, the third data D3 and the fourth data D4. The power amplifier (102b) of the external amplifier amplifies the sound signals S1 based on the retrieved first data D1, second data D2, third data D3 and fourth data D4. The power amplifier (102b) transmit the amplified sound signals S1 to one or more speakers, and/or one or more sub-woofers and/or one or more tweeters based on the frequency of the amplifier sound signals S1.
ADVANTAGES
[0061] The present disclosure provides an audio system with pulse width modulation based communication and a method performed by the audio system. The present system and method does not use CAN and LIN based communication protocols. Accordingly, the system and the method are economical as the system and method do not need additional electronic components to transmit and receive signals. Further, the system and method use pulse width modulation based communication which prevent noise disruption during communication.
[0062] The above description does not provide specific details of the manufacture or design of the various components. Those of skill in the art are familiar with such details, and unless departures from those techniques are set out, techniques, known, related art or later developed designs and materials should be employed. Those in the art are capable of choosing suitable manufacturing and design details.
[0063] It should be understood, however, that all of these and similar terms are to be associated with the appropriate physical quantities and are merely convenient labels applied to these quantities. Unless specifically stated otherwise, as apparent from the discussion herein, it is appreciated that throughout the description, discussions utilizing terms such as “receiving,” or “retrieving,” or “comparing,” or “generating,” or the like, refer to the action and processes of a computer system, or similar electronic computing device, that manipulates and transforms data represented as physical (electronic) quantities within the computer system's registers and memories into other data similarly represented as physical quantities within the computer system memories or registers or other such information storage, transmission or display devices.
[0064] The exemplary embodiment also relates to a system for performing the operations discussed herein. This system may be specially constructed for the required purposes, or it may comprise a general-purpose computer selectively activated or reconfigured by a computer program stored in the computer. Such a computer program may be stored in a computer-readable storage medium, such as, but is not limited to, any type of disk including floppy disks, optical disks, CD-ROMs, and magnetic-optical disks, read-only memories (ROMs), random access memories (RAMs), EPROMs, EEPROMs, solid state drives, magnetic or optical cards, or any type of media suitable for storing electronic instructions, and each coupled to a computer system bus.
[0065] Further, the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. It will be appreciated that several of the above-disclosed and other features and functions, or alternatives thereof, may be combined into other systems or applications. Various presently unforeseen or unanticipated alternatives, modifications, variations, or improvements therein may subsequently be made by those skilled in the art without departing from the scope of the present disclosure as encompassed by the following claims.
[0066] The claims, as originally presented and as they may be amended, encompass variations, alternatives, modifications, improvements, equivalents, and substantial equivalents of the embodiments and teachings disclosed herein, including those that are presently unforeseen or unappreciated, and that, for example, may arise from applicants/patentees and others.
[0067] It will be appreciated that variants of the above-disclosed and other features and functions, or alternatives thereof, may be combined into many other different systems or applications. Various presently unforeseen or unanticipated alternatives, modifications, variations, or improvements therein may be subsequently made by those skilled in the art which are also intended to be encompassed by the following claims.
, Claims:We Claim:
1. A method (500) performed by an audio system (100) with pulse width modulation based communication, the method (500) comprises:
transmitting (502), by a main unit (101), sound signals S1 to an external amplifier (102);
generating (504), by a main digital signal processor (101a) of the main unit (101), encoded data signals S2 based on a first data D1, a second data D2, a third data D3 and a fourth data D4;
transmitting (504), by the main digital signal processor (101a) of the main unit (101), the generated encoded data signals S2 in the form of pulse width modulation to the external amplifier (102);
receiving (506), by a digital signal processor (102a) of the external amplifier (102), the transmitted encoded data signals S2 in the form of pulse width modulation signals and the sound signals S1;
decoding (508), by the digital signal processor (102a) of the external amplifier (102), the received encoded data signals S2 and retrieving the first data D1, the second data D2, the third data D3 and the fourth data D4;
amplifying (510), by a power amplifier (102b) of the external amplifier (102), the received sound signals S1 based on the retrieved first data D1, second data D2, third data D3 and fourth data D4; and
transmitting (512), by the power amplifier (102b) of the external amplifier (102), the amplified sound signals S1 to one or more speakers (103a) and/or one or more sub-woofers (103b) and/or one or more tweeters (103c) based on the frequency of the amplified sound signals S1.
2. The method (500) as claimed in claim 1, wherein the first data D1 is frequency of sound, the second data D2 is phase of sound, the third data D3 is sound pressure level and the fourth data D4 is user input at the main unit (101).
3. The method (500) as claimed in claim 1, wherein the fourth data D4 includes at least one of:
low ranges gain demand and phase in the range 20 Hz to 120 Hz;
low-mid gain demand and phase in the range 120 Hz to 5 KHz;
high-mid gain demand and phase in the range up to 5 KHz;
high node 1 gain demand and phase in the range 5 KHz to 15 KHz; and
high node 2 gain demand and phase in the range 15 KHz to 20 KHz.
4. The method (500) as claimed in claim 1, wherein the main digital signal processor (101a) of the main unit (101) encodes and transmits low frequency ranges to the external amplifier (102) by manipulating data signals S2 in the form of pulse width modulation signal with 1 milliseconds changeover.
5. The method (500) as claimed in claim 1 and 4, wherein the main digital signal processor (101a) of the main unit (101) encodes and transmits low frequency ranges to the external amplifier (102) by manipulating data signals S2 in the form of pulse width modulation of 5 volts.
6. The method (500) as claimed in claim 1, wherein the main digital signal processor (101a) encodes and transmits high frequency ranges to the external amplifier (102) by manipulating the data signals S2 in the form of pulse width modulation with 5 milliseconds changeover.
7. The method (500) as claimed in claim 1 and 6, wherein the digital signal processor (101a) encodes and transmits high frequency ranges to the external amplifier (102) by manipulating the data signals S2 in the form of pulse width modulation of 10 volts.
8. The method as claimed in claim 1, wherein the communication between the main unit (101) and the external amplifier (102) is started by performing handshake process which transmits pulse width modulated initiation signals of specific voltage and time period.
9. The method (500) as claimed in claim 1, wherein the amplified sound signals S1 with frequency in the range 20 Hz to 120 Hz is sent to one or more sub-woofers (103b) by the power amplifier (102b) of the external amplifier (102).
10. The method (500) as claimed in claim 1, wherein the amplified sound signals S1 with frequency in the range 120 Hz to 5 KHz is sent to one or more speakers (103a) by the power amplifier (102b) of the external amplifier (102).
11. The method (500) as claimed in claim 1, wherein the amplifier sound signals S1 with frequency in the range 5 KHz to 20 KHz is sent to one or more tweeters (103c) by the power amplifier (102b) of the external amplifier (102).
12. An audio system (100) with pulse width modulation based communication, the audio system (100) comprises:
a main unit (101) configured to transmit sound signals S1 and data signals S2, wherein the main unit (101) has a main digital signal processor (101a) capable of encoding and transmitting data signals S2, in the form of pulse width modulation, based on a first data D1, a second data D2, a third data D3 and a fourth data D4;
an external amplifier (102), operatively connected to the main unit (101), configured to receive sound signals S1 and encoded data signals S2 transmitted by the main unit (101), wherein the external amplifier (102) has a digital signal processor (102a) capable of receiving and decoding encoded data signals S2 received in the form of pulse width modulation signals to retrieve the first data D1, the second data D2, the third data D3 and the fourth data D4 and a power amplifier (102b) to amplify and transmit sound signals S1 based on the retrieved first data D1, second data D2, third data D3 and fourth data D4; and
one or more speakers (103a), sub-woofers (103b) and tweeters (103c) each operatively connected to the external amplifier (102), wherein the power amplifier (102b) of the external amplifier (102) is configured to transmit amplified sound signals S1 based on the frequency of the amplified sound signals S1.
13. The system (100) as claimed in claim 12, wherein the first data D1 is frequency of sound, the second data D2 is phase of sound, the third data D3 is sound pressure level and the fourth data D4 is user input at the main unit (101).
14. The system (100) as claimed in claim 12, wherein the fourth data D4 includes at least one of:
low gain demand and phase in the range 20 Hz to 120 Hz;
low-mid gain demand and phase in the range 120 Hz to 5 KHz;
high-mid gain demand and phase in the range up to 5 KHz;
high node 1 gain demand and phase in the range 5 KHz to 15 KHz; and
high node 2 gain demand and phase in the range 15 KHz to 20 KHz.
15. The system (100) as claimed in claim 12, wherein the main digital signal processor (101a) encodes and transmits low frequency ranges to the external amplifier (102) by manipulating data signals S2 in the form of pulse width modulation signal with 1 milliseconds changeover.
16. The system (100) as claimed in claims 12 and 15, wherein the main digital signal processor (101a) encodes and transmit low frequency ranges to the external amplifier (102) by manipulating data signals S2 in the form of pulse width modulation of 5 volts.
17. The system (100) as claimed in claim 12, wherein the main digital signal processor (101a) encodes and transmits high frequency ranges to the external amplifier (102) by manipulating the data signals S2 in the form of pulse width modulation with 5 milliseconds changeover.
18. The system (100) as claimed in claims 12 and 17, wherein the main digital signal processor (101a) encodes and transmits high frequency ranges to the external amplifier (102) by manipulating the data signals S2 in the form of pulse width modulation of 10 volts.
19. The system as claimed in claim 12, wherein the communication between the main unit and the external amplifier is started by performing handshake process which transmits a pulse width modulated initiation signals of specific voltage and time period.
20. The system (100) as claimed in claim 12, wherein the amplified sound signals S1 with frequency in the range 20 Hz to 120 Hz is transmitted to one or more sub-woofers (103b) by the power amplifier (102b) of the external amplifier (102).
21. The system (100) as claimed in claim 12, wherein the amplified sound signals S1 with frequency in the range 120 Hz to 5 KHz is transmitted to one or more speakers (103a) by the power amplifier (102b) of the external amplifier (102).

22. The system (100) as claimed in claim 12, wherein the amplifier sound signals S1 with frequency in the range 5 KHz to 20 KHz is transmitted to one or more tweeters (103c) by the power amplifier ((102b) of the external amplifier (102).