Detector and classified audio signal automatic gain control device

Abstract

The invention provides a digital detector, and the detector comprises a modulo operation module which is used for obtaining a digital audio signal and carrying out the modulo operation, and obtaining a value after the modulo operation; the delayer is used for delaying an envelope signal of one period of a current amplitude envelope value, and transmitting a first value obtained by first operation of the modular operation module to the first comparator; the first comparator is used for receiving the first value and a second value obtained by second operation of the modulo operation module, and comparing the first value with the second value; the second comparator is used for receiving the first value and a noise threshold value and comparing the first value with the noise threshold value; the third comparator is used for receiving a product of the first value and a time parameter and a noise threshold value, and comparing the product of the first value and the time parameter and the noise threshold value; according to the invention, rapid detection and noise threshold setting can be realized to prevent noise signal output, so that the efficiency and the broadcasting effect are improved.

Description

technical field [0001] The invention relates to the field of audio signal processing, in particular to a wave detector, a classification audio processing device, a classification audio signal automatic gain control device, a transmitter and a classification audio signal automatic gain control method. Background technique [0002] During the broadcasting of audio programs, different programs or large differences in sound loudness in the same program will affect the modulation degree of the audio broadcasting transmitting equipment, so that the transmitter cannot transmit audio signals with a relatively balanced modulation degree, resulting in waste of power. The listening effect is not good; the current amplitude control of the audio signal is mainly divided into two categories, one is the use of analog circuits, the analog envelope tracking method plus automatic gain control to achieve the purpose of controlling the signal amplitude; the second category is A professional aud...

AI Technical Summary

Problems solved by technology

[0002] During the broadcasting of audio programs, different programs or large differences in sound loudness in the same program will affect the modulation degree of audio broadcasting transmitting equipment, so that the transmitter cannot The audio signal is transmitted with a relatively balanced modulation degree, resulting in waste of power, and the user's listening effect is not good; the current amplitude control of the audio signal is mainly divided into two categories, one is the use of analog circuits, and the method of analog envelope tracking is added. Automatic gain control to achieve the purpose of controlling the signal amplitude; the second type is to use a professional audio processor to control the gain of the sound signal

However, the former cannot process digital audio signals, and has poor consistency in the processing of analog signals, and has the defect of amplifying noise together, and it is also inconvenient to adjust the audio amplitude; the latter, although the audio processor has comprehensive functions, is expensive. Poor integration and pertinence

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