Intelligent volume limiting device and method

Abstract

The invention discloses an intelligent volume limiting device, comprising a variable gain amplifier, an input end sampling circuit and / or an output end sampling device and a microprocessor, wherein the variable gain amplifier amplifies audio signals and outputs the audio signals to a loudspeaker; the input end sampling circuit carries out sampling on the audio signals input to the variable gain amplifier, and the output end sampling device carries out sampling on the audio signals output by the variable gain amplifier; the microprocessor calculates a control signal which can control the amplification factor of the variable gain amplifier according to sampled signals provided by the input end sampling circuit and / or the output end sampling device; and the variable gain amplifier amplifies and outputs the input audio signals according to the control signal provided by the microprocessor. In the intelligent volume limiting device, real-time monitoring is carried out on a signal input end or a signal output end, so that real-time limitation for audio output volume is realized.

Description

technical field [0001] The present invention relates to an intelligent volume limiting device and method, in particular to a volume limiting device and method on audio equipment. Background technique [0002] Currently, the volume of audio playback devices on the market can only be adjusted manually; when TVs and radios change channels, they will also be adjusted according to the volume difference between different channels. But these are just volume adjustment techniques, not volume limiting techniques. There are two existing volume limiting technologies. [0003] One is to simply limit the maximum output voltage, which can cause severe distortion of the output sound. The other is to convert an analog audio signal into a digital audio signal by using an analog-to-digital converter (ADC), then use a digital signal processor (DSP) to process the audio signal, and then convert the digital audio signal through a digital-to-analog converter (DAC) into an analog audio signal. ...

AI Technical Summary

Problems solved by technology

There are two disadvantages in this way: one is that the cost is difficult to reduce, and the other is that there will be a delay from audio input to output through three links, so this technology cannot be applied to many applications

At this time, simply setting a fixed power amplification factor can no longer adapt to these applications that are sensitive to volume intensity.

Images