In one embodiment, a signal-processing apparatus for generating an amplified output signal based on an input signal is provided. The apparatus comprises: an amplifier configured to generate the output signal, wherein the amplifier is configured to receive a supply voltage; and a limiter configured to inhibit increases in the input signal power level from being applied to the amplifier, wherein the limiter comprises: a variable attenuator configured to selectively attenuate the input signal before being applied to the amplifier; wherein the limiter integrates over a voltage difference between a current measure of attenuated input signal power level and a limiter threshold level to control a level of attenuation applied by the variable attenuator to the input signal.

In one embodiment, a signal-processing apparatus for generating an amplified output signal based on an input signal is provided. The apparatus comprises: an amplifier configured to generate the output signal, wherein the amplifier is configured to receive a supply voltage; and a limiter configured to inhibit increases in the input signal power level from being applied to the amplifier, wherein the limiter comprises: a variable attenuator configured to selectively attenuate the input signal before being applied to the amplifier; wherein the limiter integrates over a voltage difference between a current measure of attenuated input signal power level and a limiter threshold level to control a level of attenuation applied by the variable attenuator to the input signal.

In at least one embodiment, an audio limiter system is provided. The system includes a first limiter block, a second limiter block, and a third limiter block. The first limiter block receives an incoming audio signal having a plurality of first frequencies and limits the incoming audio signal with the plurality of first frequencies based on at least a first gain threshold to generate at least a first high audio output signal. The second limiter block receives the incoming audio signal having a plurality of second frequencies and limits the incoming audio signal with the plurality of second frequencies based on at least a second gain threshold to generate at least a first low audio output signal. The third limiter block receives the first high audio output signal and/or the first low audio output signal and limits the first high audio output signal and/or the first low audio output signal.

In at least one embodiment, an audio limiter system is provided. The system includes a first limiter block, a second limiter block, and a third limiter block. The first limiter block receives an incoming audio signal having a plurality of first frequencies and limits the incoming audio signal with the plurality of first frequencies based on at least a first gain threshold to generate at least a first high audio output signal. The second limiter block receives the incoming audio signal having a plurality of second frequencies and limits the incoming audio signal with the plurality of second frequencies based on at least a second gain threshold to generate at least a first low audio output signal. The third limiter block receives the first high audio output signal and/or the first low audio output signal and limits the first high audio output signal and/or the first low audio output signal.

There is provided a limiter circuit and a power amplifier circuit that are capable of effectively limiting output power of an amplifying transistor based on the amplitude of an input signal. A limiter circuit is connectable to an amplifying transistor that amplifies and outputs a radio frequency signal and controls a voltage to be applied to the amplifying transistor, based on the radio frequency signal. The limiter circuit includes an input signal detection transistor that detects power of the radio frequency signal and a voltage limiting transistor that limits the voltage to be applied to the amplifying transistor, based on current flowing to the input signal detection transistor.

A method and apparatus for processing a recording is described. Analogue audio data is recorded and converted into digital audio data. The digital audio data is cached to a preset buffer. The digital audio data is called back from the buffer and is filtered according to a preset peak power threshold and an average power gradient threshold to obtain filtered audio data.

A method and apparatus for processing a recording is described. Analogue audio data is recorded and converted into digital audio data. The digital audio data is cached to a preset buffer. The digital audio data is called back from the buffer and is filtered according to a preset peak power threshold and an average power gradient threshold to obtain filtered audio data.

There is described herein a real-time scheme, implementable in software, hardware, or a combination thereof, to detect a resonating frequency of a structure from a sensed signal and dynamically set the center frequency of an adaptive compensator for effective attenuation of the resonating frequency.

The present invention discloses a speaker device and electronic equipment. The speaker device comprises a speaker body, an audio signal input terminal connected with the speaker body, and a DC voltage signal input terminal connected with the speaker body. The electronic equipment comprises the speaker device and a DC voltage signal output circuit. The present invention further discloses a method for reducing a low frequency distortion degree of the speaker of the electronic equipment, and the method is realized by additionally providing a DC voltage signal to the input end of the speaker. In the present invention, a distortion degree of the speaker device at a low-frequency working condition can be reduced, and inconsistency of low frequency distortion of the speaker device, caused by mass production, can be reduced.

The present invention discloses a speaker device and electronic equipment. The speaker device comprises a speaker body, an audio signal input terminal connected with the speaker body, and a DC voltage signal input terminal connected with the speaker body. The electronic equipment comprises the speaker device and a DC voltage signal output circuit. The present invention further discloses a method for reducing a low frequency distortion degree of the speaker of the electronic equipment, and the method is realized by additionally providing a DC voltage signal to the input end of the speaker. In the present invention, a distortion degree of the speaker device at a low-frequency working condition can be reduced, and inconsistency of low frequency distortion of the speaker device, caused by mass production, can be reduced.