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What are the functions of digital audio processor, feedback suppressor, equalizer and mixer?
Digital audio processor functions: The input part generally includes input gain control, input equalization, input delay, input polarity conversion and other functions.

Function of feedback suppressor: When acoustic feedback occurs, it will immediately find and calculate its frequency and attenuation, and execute the command to suppress acoustic feedback according to the calculation results.

The function of equalizer: adjust timbre, adjust sound field and suppress sound feedback.

Function of mixer: The mixer is not only suitable for family singing, but also suitable for stage performances and multi-person conference rooms. Can be used in series. If you need to use multiple microphones at the same time, you can also choose a multi-function mixer (12 inputs and one output). Powerful four-in-one circuit design: four groups of audio signals can be input at the same time, and each group of circuits does not interfere with each other and cross talk with each other.

Each signal input has an independent volume regulator, and its internal circuit adopts internationally recognized audio operational amplifier IC: NE 5532 or JRC4558 operational amplifier to ensure clear and beautiful sound.

Digital audio processor, feedback suppressor, equalizer and mixer cannot replace each other.

Extended data:

The main features of digital audio processor are input gain, input equalization, input delay and input polarity conversion.

The working principle of feedback suppressor: using computer technology to quickly scan and automatically find the audio signal frequency that starts screaming (that is, the screaming frequency), and automatically generate a set of narrowband filters with the same screaming frequency to cut off the screaming frequency, thus automatically suppressing screaming and eliminating acoustic feedback.

The feedback suppressor consists of amplifier, A/D converter, narrowband digital filter bank, digital signal processor, feedback center frequency detector and D/A converter.

Equalizers are divided into frequency domain equalizer and time domain equalizer. Frequency domain equalizer uses the frequency characteristics of tunable filter to compensate the amplitude-frequency characteristics and group delay characteristics of the actual channel. The total frequency characteristics of the whole system, including the equalizer, meet the transmission conditions without intersymbol interference.

Considering the time domain equalizer directly from the perspective of time response, the impulse response of the whole transmission system including the equalizer meets the condition of no inter-symbol interference. Frequency domain equalization meets the requirements of Nyquist shaping theorem, and the condition of decision point without isi is relatively loose. Therefore, time domain equalizer has been widely used in digital communication.

The input signal of hardware mixer can be computer audio output signal (with anti-static design circuit), wired microphone signal, wireless microphone signal, CD/VCD/DVD audio signal, wireless earphone output audio signal, MP3/MP4 audio signal, etc. Suitable for families, dance halls, recording studios, etc.

The input signal of software mixer can be digital audio file, computer system sound and input signal of computer terminal (such as microphone), which is suitable for audio editing.

Baidu Encyclopedia-Digital Audio Processor

Baidu encyclopedia-feedback suppressor

Baidu encyclopedia-equalizer

Baidu encyclopedia-mixer