DESC:TECHNICAL FIELD OF THE INVENTION

[0001] The present invention relates generally to the field of acoustic power amplifiers. The invention particularly relates to multiple output acoustic power amplifiers. More particularly, the present invention relates to an autonomous multi-output acoustic power amplifier with frequency driven input switching, a method and system thereof.

BACKGROUND OF THE INVENTION

[0002] Traditional power amplifier systems predominantly use multiple power amplifiers for multi-output functionality, which requires dedicated input corresponding to each output. But integration of channel selection mechanism to automatically switch between the output channels based on input frequency is a challenge.
[0003] For example, US Patent Application US355097A discloses an acoustic amplifier comprising a starter circuit which sets the output potential of an output amplifier circuit at ground potential upon the connection of the power supply and then gradually raises the output potential up to the operating voltage of the output amplifier circuit, whereby the load of the acoustic amplifier is made operative without 'pop' noise.
[0004] The US Patent Application US12/256,179 A1 discloses an acoustic amplifier in which automatic tuning will happen based on frequency of transducer on sonar transmitter and receiver.
[0005] The cited US Patent Application US08/737,022 discusses an acoustic amplifier in which an acoustic transmitter sources transmits sound waves in water, particularly low-frequency sound waves.
[0006] The US Patent Application document US08/664,314 discusses an acoustic amplifier in which an electrical wave generated for powering loudspeaker drivers. More particularly, the invention relates to waveform generators and power amplifiers for producing electrical signals for powering loudspeaker drivers to emit acoustic signals and finds particular application to powering acoustic warning devices such as foghorns.
[0007] The above disclosed patents disclose methods and system that suffer from integration of channel selection mechanism to automatically switch between the output channels based on input frequency. Further, none of the above documents provides or discloses an intelligent acoustic power amplifier with output power selection feature; and a power amplifier with a digital bus notification based on the output channel selected.
[0008] In brief, there is a requirement of autonomous acoustic power amplifier system with multi-output functionality, where the amplifier system can integrate a channel selection mechanism to automatically switch between the output channels based on input frequency and provide an intelligent output power selection feature.
SUMMARY OF THE INVENTION

[0009] This summary is provided to introduce concepts of the present invention. This summary is neither intended to identify essential features of the present invention nor is it intended for use in determining or limiting the scope of the present invention.
[0010] In one aspect, the present invention provided an acoustic power amplifier with frequency driven input switching. An acoustic power amplifier is an electronic device that converts the amplitude of an incoming signal, mostly in the acoustic frequency band, to a higher voltage level. The amplifier disclosed herewith in the present invention comprises band pass filters, full bridge amplifiers, digital data bus notification, and current/voltage/temperature monitoring circuits. These devices or amplifiers, in addition to signal amplification, also ensure whether it can supply respective currents required to drive acoustic loads.
[0011] An acoustic power amplifier with frequency driven input switching, the amplifier comprising an input band pass filter configured to receive a multi frequency acoustic input signal from a signal source and allow BPF signals being the signal of a predetermined frequency band to pass through the filter while blocking signal of all other frequencies, a digital notification bus circuitry in communication with the input band pass filter, the circuitry configured to generate digital bus voltages from the BPF signals; a full bridge amplifier in communication with the input band pass filter, the amplifier configured to amplify the BPF signal and generate full bridge amplifier (FBA) signals; a voltage/ current/ temperature monitoring circuitry in communication with the full bridge amplifier, the circuity configured to generate analog signals equivalent to a measured load voltage, a measured load current and an ambient temperature from the FBA signal.
[0012] The amplifier is further configured to compare the BPF signal with a fixed reference voltage, generate a trigger signal based on the comparison, and feed the trigger signal to a timer circuit to generate a pulse corresponding to the BPF signal.
[0013] Typically, the input band pass filter comprises multiple filter circuits arranged within the input band pass filter, wherein a common multi frequency acoustic input signal is given to each filter circuit and each filter circuit generates a single BPF signal based on the respective bandpass circuit coefficients.
[0014] Further, the input band pass filter has one input signal channel and multiple output signal channels, wherein the number of output signal channels giving simultaneous outputs depends on the circuit characteristics of each filter.
[0015] Furthermore, an automatic output channel selection technique is implemented in the input band pass filter based on the frequency of the multi frequency acoustic input signal.
[0016] Typically, a complex input signal is simultaneously coupled to the multiple output signal channels of bandpass filter (201) based on the band pass filter (201) characteristics to obtain a simultaneous power amplifier channel outputs.
[0017] The full bridge amplifier comprises a ramp generator configured to generate a fixed ramp reference signal; a first Pulse Width Modulator (PWM) generator configured to receive the fixed ramp reference signal and to generate a normal PWM-N signal based on the fixed ramp reference signal and an amplitude of single BPF signal, irrespective of frequency of the BPF signal; an inverter configured to invert the single BPF signal; a second Pulse Width Modulator (PWM) generator connected to the invertor, the generator configured to receive the fixed ramp reference signal and to generate a PWM-I signal based on the ramp reference signal and the amplitude of inverted single BPF signal, irrespective of frequency of the BPF signal; one or more isolated gate drivers with dead time circuitry, configured to receive PWM-N & PWM-I signals and generate control signals; and a full bridge switched circuitry configured to receive the control signal and generate the FBA signal corresponding to the control signals.
[0018] Preferably, the dead time circuitry in one or more isolated gate drivers with dead time circuitry is implemented using operational amplifiers.
[0019] The voltage/current/temperature monitoring circuitry comprises a thermistor circuitry configured to monitor the ambient temperature of the acoustic power amplifier and generate an equivalent analog signal corresponding to the ambient temperature; a voltage monitoring circuitry configured to monitor the FBA signal received from the full bridge amplifier using a voltage divider and generate an amplified buffered analog signal as output using a voltage amplifier circuitry, and current sense circuitry configured to sense a current across a load using a sense resistor and generate an amplified buffered analog signal corresponding to the current sensed using a current amplifier circuitry.
[0020] In another aspect, the present invention provides an autonomous multi-output acoustic power amplifier system with frequency driven input switching. The autonomous power amplifier system with multi-output functionality also provides dead time handling mechanism to obtain stability to switching circuits and improves efficiency of an amplifier and signal inversion circuitry to generate full bridge output using single band pass filter input.
[0021] An acoustic power amplifier system with frequency driven input switching, wherein the system comprises: an acoustic power amplifier; a signal source; an acoustic loads; and a power source.
[0022] In the third aspect, the present invention provides for an autonomous multi-output acoustic power amplifier method with frequency driven input switching. An acoustic power amplifier method with frequency driven input switching, wherein the method comprises the steps: receiving by an acoustic power amplifier, an acoustic input signal from a signal source; filtering by an input band pass filter block of the acoustic power amplifier, the acoustic input signal for generating BPF signals; generating by a digital notification bus circuitry of the acoustic power amplifier, digital bus voltages from the BPF signals; generating by a full bridge amplifier block of the acoustic power amplifier, FBA signals from the BPF signals; comparing by the amplifier the BPF signal with a fixed reference voltage; generating a trigger signal based on the comparison; and feeding the trigger signal to a timer circuit for generating a pulse corresponding to the BPF signal.
[0023] The acoustic power amplifier method further comprises the steps of monitoring by a thermistor circuitry an ambient temperature of the acoustic power amplifier and generating an equivalent analog signal corresponding to the ambient temperature; monitoring by a voltage monitoring circuitry the FBA signal received from the full bridge amplifier using a voltage divider and generating an amplified buffered analog signal as output using a voltage amplifier circuitry, and sensing by a current sense circuitry a current across a load using a sense resistor and generating an amplified buffered analog signal corresponding to the current sensed using a current amplifier circuitry.
[0024] Other aspects, advantages, and salient features of the invention will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses exemplary embodiments of the invention.
BRIEF DESCRIPTION OF ACCOMPANYING DRAWINGS

[0025] The detailed description is described with reference to the accompanying figures. In the figures, the left-most digit(s) of a reference number identifies the figure in which the reference number first appears. The same numbers are used throughout the drawings to reference features and modules.
[0026] Figure 1 illustrates a detailed block diagram of an autonomous multi-output power amplifier system with acoustic load and power supply in accordance with an embodiment of the present invention.
[0027] Figure 2 illustrates a detailed block diagram of power amplifier card, in accordance with an embodiment of the present invention.
[0028] Figure 3 illustrates a schematic diagram of band pass filter, in accordance with an embodiment of the present invention.
[0029] Figure 4 illustrates a detailed block diagram of a full bridge amplifier, in accordance with an embodiment of the present invention.
[0030] Figure 5 illustrates a current voltage monitoring circuit, in accordance with an embodiment of the present invention.
[0031] It should be appreciated by those skilled in the art that any block diagrams herein represent conceptual views of illustrative methods embodying the principles of the present invention. Similarly, it will be appreciated that any flow charts, flow diagrams, and the like represent various processes which may be substantially represented in computer readable medium and so executed by a computer or processor, whether or not such computer or processor is explicitly shown.

DETAILED DESCRIPTION OF THE INVENTION

[0032] The various embodiments of the present invention describe an autonomous multi-output acoustic power amplifier with frequency driven input switching, a method and system thereof.
[0033] In the following description, for the purpose of explanation, specific details are set forth in order to provide an understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without these details. One skilled in the art will recognize that embodiments of the present invention, some of which are described below, may be incorporated into a number of systems.
[0034] However, the systems and methods are not limited to the specific embodiments described herein. Further, structures and devices shown in the figures are illustrative of exemplary embodiments of the present invention and are meant to avoid obscuring of the present invention.
[0035] It should be noted that the description merely illustrates the principles of the present invention. It will thus be appreciated that those skilled in the art will be able to devise various arrangements that, although not explicitly described herein, embody the principles of the present invention. Furthermore, all examples recited herein are principally intended expressly to be only for explanatory purposes to help the reader in understanding the principles of the invention and the concepts contributed by the inventor to furthering the art and are to be construed as being without limitation to such specifically recited examples and conditions. Moreover, all statements herein reciting principles, aspects, and embodiments of the invention, as well as specific examples thereof, are intended to encompass equivalents thereof.
[0036] The present invention relates to methodology and system for an autonomous multi-output acoustic power amplifier with frequency driven input switching. The system implements the functionality without the aid of any controller ICs.
[0037] In an aspect, present invention provides an autonomous acoustic power amplifier system, wherein the number of outputs & operating frequency can be configured based on end application.
[0038] In another aspect, the present invention provides an autonomous acoustic power amplifier system, wherein the automatic channel selection is implemented based on input signal frequency. Based on the band pass filter characteristics, the input signal gets coupled to respective output channel.
[0039] In another aspect, the present invention provides an autonomous acoustic power amplifier system, wherein simultaneous power amplifier channel outputs can be obtained if the input source is a complex signal having frequencies supported by bandpass filter.
[0040] Yet in another aspect, the present invention provides an autonomous acoustic power amplifier with frequency driven input switching, wherein an intelligent output power selection is implemented based on the input signal amplitude. Fixed ramp reference signal generates variable PWM signals based on incoming signal amplitude irrespective of frequency.
[0041] In another aspect, the present invention provides the autonomous acoustic power amplifier with frequency driven input switching, wherein output channel based digital bus notification technique is implemented. The digital bus circuitry generates digital bus voltages based on band pass filter outputs.
[0042] Further, in another aspect, the autonomous acoustic power amplifier with frequency driven input switching, dead time handling circuitry is implemented using operational amplifiers.
[0043] Yet in another aspect of the present invention, the full bridge amplifier of the autonomous acoustic power amplifier with frequency driven input switching, wherein the signal inversion mechanism to generate full bridge output is implemented using single band pass filter input.
[0044] In another aspect, the present invention provides an autonomous acoustic power amplifier with frequency driven input switching, wherein voltage, current and temperature monitoring circuitry are implemented.
[0045] In one embodiment, the present invention provides an autonomous multi-output acoustic power amplifier system with frequency driven input switching. The autonomous power amplifier system with multi-output functionality also provides dead time handling mechanism to obtain stability to switching circuits and improves efficiency of an amplifier and signal inversion circuitry to generate full bridge output using single band pass filter input.
[0046] Referring to Figure 1, a detailed block diagram of an autonomous multi-output power amplifier system with acoustic load and power supply is illustrated. The system comprises a power amplifier card (101), a signal source (102), an acoustic loads (107) and a power source (108).
[0047] As shown in figure 1, the power amplifier card (101) converts a multi frequency acoustic input received from signal source (102) and transmits the amplified output to acoustic loads (107). The system is powered using the power source (108). This system gives analog output voltages corresponding to voltage monitored (103), current monitored (104), and temperature monitored (105), in addition to digital bus notification (106) corresponding to the output channel selected.
[0048] In another embodiment of the present invention relates an acoustic power amplifier with frequency driven input switching. An acoustic power amplifier is an electronic device that converts the amplitude of an incoming signal, mostly in the acoustic frequency band, to a higher voltage level. The amplifier disclosed herewith in the present invention comprises band pass filters, full bridge amplifiers, digital data bus notification, and current/voltage/temperature monitoring circuits. These devices or amplifiers, in addition to signal amplification, also ensures whether it can supply respective currents required to drive acoustic loads.
[0049] Now, referring to Figure 2, a detailed block diagram of acoustic power amplifier also referred as a power amplifier card (101) is illustrated. The power amplifier card (101) comprises an input band pass filter (201), a full bridge amplifier (204), a digital notification bus circuitry (202) and voltage/current/temperature monitoring circuitry (203). The band pass filter (201) gets acoustic input from source (102). The input band pass filter (201) receives an acoustic input signal from the signal source (102), supports a particular frequency band in the input signal and allows the particular frequency band in the signal i.e. BPF signals to pass through and blocking all other frequencies. The BPF signal from the input band pass filter (201) is fed to the full bridge amplifier (204) for amplification and generation of FBA signals. The digital bus circuitry (202) is generating digital bus voltages based on band pass filter (201) and the outputs i.e. the BPF signals from the input band pass filter (201) is fed to the digital notification bus circuitry (202) for generating digital bus voltages. The bandpass filter outputs are compared with respect to a fixed reference voltage and a trigger signal is generated. This trigger is fed as input to a timer circuit which generates a pulse corresponding to the filtered signal. Thus, multiple pulse signals generated gives the digital notification to the bus (202). The voltage-current-temperature monitoring circuitry (203) generates analog signals equivalent to measured load voltage, load current and ambient temperature.
[0050] Referring to Figure 3, a schematic diagram of band pass filter in accordance with an embodiment of the present invention is illustrated. The band pass filter (201) comprises multiple filter circuits (BPF1, BPF2, ----- BPFn) arranged within the said filter (201).
[0051] As shown in figure 3, each filter circuit (BPF1, BPF2, ----- BPFn) shares a common input signal and generates filtered outputs based on the respective bandpass circuit coefficients. The band pass filter has only one input signal path/channel but multiple output signal paths/ channels. The number of output signal paths/channels giving simultaneous outputs depends on the filter circuit characteristics i.e. which frequency to pass and is implemented automatically. Thus, this implementation is termed as “an automatic channel selection technique”. The technique is implemented based on input signal frequency i.e. based on the band pass filter (201) characteristics; the input signal gets coupled to respective output channel.
[0052] Further, in the acoustic power amplifier (101) of the present invention, simultaneous power amplifier channel outputs can be obtained if the input source is a complex signal. Considering that the filter circuit (BPF1, BPF2, ----- BPFn) supports the input signals of frequency f1, f2, ... fn, then the complex signal is the combination of those signals which enables all BPF block outputs. The simultaneous power amplifier channel outputs can be obtained when the complex input signal having multiple frequencies get coupled simultaneously to respective output channel of bandpass filter (201) based on the band pass filter (201) characteristics.
[0053] Referring to Figure 4, details of full bridge amplifier (204) are illustrated. The full bridge amplifier (204) comprises Pulse Width Modulator (PWM) generators (401, 404), a ramp generator (402), an inverter (403), one or more isolated gate drivers with dead time circuitry (405, 406), and full bridge switched circuitry (407). The ramp generator (402) is configured to generate a fixed ramp reference signal. The first Pulse Width Modulator (PWM) generator (401) is configured to receive the fixed ramp reference signal and to generate a normal PWM-N signal based on the fixed ramp reference signal and an amplitude of single BPF signal, irrespective of frequency of the BPF signal. Further, the inverter (403) is configured to invert the single BPF signal, and the second Pulse Width Modulator (PWM) generator (404) is connected to the invertor (403). The generator (404) receives the fixed ramp reference signal and generates a PWM-I signal based on the ramp reference signal and the amplitude of inverted single BPF signal, irrespective of frequency of the BPF signal. The one or more isolated gate drivers with dead time circuitry (405, 406), configured to receive PWM-N & PWM-I signals and generate control signals. The full bridge switched circuitry (407) configured to receive the control signal and generate the FBA signal corresponding to the control signal.
[0054] The PWM generators (401 & 404), based on signal amplitude of the incoming filtered signal (BPF signals), convert the incoming filtered signal (BPF signals) to equivalent pulse width modulated outputs using fixed ramp reference signal generated by ramp generator (402). Thus, the fixed ramp reference signal generates variable PWM signals based on incoming BPF signal amplitude irrespective of frequency. Thus, the PWM ON period varies based on the BPF signal amplitude. The BPF signal amplitude thus determines the output signal peak voltage generated. Accordingly, an intelligent output power selection is implemented based on the input signal (BPF signal) amplitude. Further, the output signal peak voltage generation is linearly related to the output power of the acoustic power amplifier (101).
[0055] The dead time circuitry is realized using operational amplifiers to ensure stability to switching circuits and improves efficiency of amplifier. The isolated gate driver (405 & 406) receives PWM-N & PWM-I signals and generates control signals for full bridge switched circuitry (407). Full bridge switched circuitry (407) generates the amplified FBA signal corresponding to the control signals and are fed to an acoustic load (107).
[0056] Referring to Figure 5, details of voltage/current/temperature monitoring circuitry (203) are illustrated. The voltage/current/temperature monitoring circuitry (203) comprises a thermistor circuitry (501), voltage monitoring circuitry and current sense circuitry. Thermistor circuitry (501) monitors the ambient temperature of the acoustic amplifier system and generates an equivalent analog signal corresponding to the same. Voltage monitoring circuitry monitors the signal sampled using voltage divider (502) and produce an amplified buffered analog signal as output using the voltage amplifier circuitry (503). Current monitoring circuitry sense the current across load using sense resistor (505) and gives an amplified buffered analog signal corresponding to current sensed using the current amplifier circuitry (504).
[0057] In third embodiment of the present invention, the present invention provides an acoustic power amplifier method with frequency driven input switching, wherein the method comprises the following steps:
[0058] receiving by an acoustic power amplifier (101), an acoustic input signal from a signal source (102);
[0059] filtering by an input band pass filter block (201) of the acoustic power amplifier (101) the acoustic input signal to generate BPF signal being the signal of a predetermined frequency band to pass through the filter while blocking signal of all other frequencies;
[0060] generating by a digital notification bus circuitry (202) of the acoustic power amplifier (101) digital bus voltages from the BPF signals;
[0061] generating by a full bridge amplifier block (204) of the acoustic power amplifier (101) FBA signals from the BPF signals;
[0062] comparing by the amplifier (101) the BPF signal with a fixed reference voltage;
[0063] generating a trigger signal based on the comparison; and
[0064] feeding the trigger signal to a timer circuit for generating a pulse corresponding to the BPF signal.
[0065] The method simultaneously comprises the following steps:
[0066] monitoring by a thermistor circuitry (501) an ambient temperature of the acoustic power amplifier (101) and generating an equivalent analog signal corresponding to the ambient temperature;
[0067] monitoring by a voltage monitoring circuitry the FBA signal received from the full bridge amplifier (204) using a voltage divider (502) and generating an amplified buffered analog signal as output using a voltage amplifier circuitry (503), and
[0068] sensing by a current sense circuitry a current across a load (107) using a sense resistor (505) and generating an amplified buffered analog signal corresponding to the current sensed using a current amplifier circuitry (504).
[0069] This present methodology and system for an autonomous multi-output acoustic power amplifier with frequency driven input switching as discussed above provides the following advantage of:
[0070] Implementing the functionality without the aid of any controller ICs. Further, based on application, number of outputs and operational frequency can be configured.
[0071] The system disclosed implements automatic output channel selection based on input frequency. Band pass filter characteristics at the input of full bridge amplifier decide which output channel gets selected.
[0072] Moreover, simultaneous power amplifier channel outputs can be obtained if the input source is a complex signal having frequencies supported by bandpass filter block.
[0073] The system filter coefficients are configurable to support user application.
[0074] The system implements output power selection based on the input signal amplitude.
[0075] The system implements digital bus notification based on the output channel selected.
[0076] The system incorporates dead time handling circuitry to obtain stability to switching circuits and improves efficiency of amplifier.
[0077] The system implements signal inversion to generate full bridge output using single band pass filter input.
[0078] The foregoing description of the invention has been set merely to illustrate the invention and is not intended to be limiting. Since modifications of the disclosed embodiments incorporating the substance of the invention may occur to person skilled in the art, the invention should be construed to include everything within the scope of the invention.
,CLAIMS:

1. An acoustic power amplifier (101) with frequency driven input switching, the amplifier (101) comprising:
an input band pass filter (201) configured to receive a multi frequency acoustic input signal from a signal source (102) and allow BPF signals being the signal of a predetermined frequency band to pass through the filter while blocking signal of all other frequencies,
a digital notification bus circuitry (202) in communication with the input band pass filter (201), the circuitry (202) configured to generate digital bus voltages from the BPF signals;
a full bridge amplifier (204) in communication with the input band pass filter (201), the amplifier (204) configured to amplify the BPF signals and generate full bridge amplifier (FBA) signals;
a voltage/ current/ temperature monitoring circuitry (203) in communication with the full bridge amplifier (204), the circuity (203) configured to generate analog signals equivalent to a measured load voltage, a measured load current and an ambient temperature from the FBA signal.

2. The acoustic power amplifier (101) as claimed in claim 1, wherein the amplifier is further configured to compare the BPF signal with a fixed reference voltage, generate a trigger signal based on the comparison, and feed the trigger signal to a timer circuit to generate a pulse corresponding to the BPF signal.

3. The acoustic power amplifier (101) as claimed in claim 1, wherein the input band pass filter (201) comprises multiple filter circuits (BPF1, BPF2, ….. BPFn) arranged within the input band pass filter (201),
wherein a common multi frequency acoustic input signal is given to each filter circuit (BPF1, BPF2, BPF3) and each filter circuit generates a single BPF signal based on the respective bandpass circuit coefficients,
wherein the input band pass filter (201) has one input signal channel and multiple output signal channels and the number of output signal channels giving simultaneous outputs depends on the circuit characteristics of each filter (BPF1, BPF2,….. BPFn),
wherein an automatic output channel selection technique is implemented in the input band pass filter (201) based on the frequency of the multi frequency acoustic input signal.

4. The acoustic power amplifier (101) as claimed in any one of claims 1-3, wherein a complex input signal is simultaneously coupled to the multiple output signal channels of bandpass filter (201) based on the band pass filter (201) characteristics to obtain a simultaneous power amplifier channel outputs.

5. The acoustic power amplifier (101) as claimed in claim 1, wherein the full bridge amplifier (204) comprises:
a ramp generator (402) configured to generate a fixed ramp reference signal;
a first Pulse Width Modulator (PWM) generator (401) configured to receive the fixed ramp reference signal and to generate a normal PWM-N signal based on the fixed ramp reference signal and an amplitude of single BPF signal, irrespective of frequency of the BPF signal;
an inverter (403) configured to invert the single BPF signal;
a second Pulse Width Modulator (PWM) generator (404) connected to the invertor (403), the generator (404) configured to receive the fixed ramp reference signal and to generate a PWM-I signal based on the ramp reference signal and the amplitude of inverted single BPF signal, irrespective of frequency of the BPF signal;
one or more isolated gate drivers with dead time circuitry (405, 406), configured to receive PWM-N & PWM-I signals and generate control signals; and
a full bridge switched circuitry (407) configured to receive the control signal and generate the FBA signal corresponding to the control signals.

6. The acoustic power amplifier (101) as claimed in claim 5, wherein the dead time circuitry in the one or more isolated gate drivers with dead time circuitry (405, 406) is implemented using operational amplifiers.

7. The acoustic power amplifier (101) as claimed in claim 1, wherein the voltage/current/temperature monitoring circuitry (203) comprises:
a thermistor circuitry (501) configured to monitor the ambient temperature of the acoustic power amplifier (101) and generate an equivalent analog signal corresponding to the ambient temperature;
voltage monitoring circuitry configured to monitor he FBA signal received from the full bridge amplifier (204) using a voltage divider (502) and generate an amplified buffered analog signal as output using a voltage amplifier circuitry (503), and
current sense circuitry configured to sense a current across a load (107) using a sense resistor (505) and generate an amplified buffered analog signal corresponding to the current sensed using a current amplifier circuitry (504).

8. An acoustic power amplifier system with frequency driven input switching, the system comprising:
an acoustic power amplifier (101) as claimed in claims 1-7;
a signal source (102);
an acoustic load (107); and
a power source (108).

9. An acoustic power amplifier method with frequency driven input switching, the method comprises the steps:
receiving by an acoustic power amplifier (101), an acoustic input signal from a signal source (102);
filtering by an input band pass filter block (201) of the acoustic power amplifier (101), the acoustic input signal for generating BPF signals;
generating by a digital notification bus circuitry (202) of the acoustic power amplifier (101), digital bus voltages from the BPF signals;
generating by a full bridge amplifier block (204) of the acoustic power amplifier (101), FBA signals from the BPF signals;
comparing by the amplifier (101) the BPF signal with a fixed reference voltage;
generating a trigger signal based on the comparison; and
feeding the trigger signal to a timer circuit for generating a pulse corresponding to the BPF signal.

10. The acoustic power amplifier method as claimed in claim 9, wherein the method further comprises the steps:
monitoring by a thermistor circuitry (501) an ambient temperature of the acoustic power amplifier (101) and generating an equivalent analog signal corresponding to the ambient temperature;
monitoring by a voltage monitoring circuitry the FBA signal received from the full bridge amplifier (204) using a voltage divider (502) and generating an amplified buffered analog signal as output using a voltage amplifier circuitry (503), and
sensing by a current sense circuitry a current across a load (107) using a sense resistor (505) and generating an amplified buffered analog signal corresponding to the current sensed using a current amplifier circuitry (504).