Method for implementing voice integrated circuit

Abstract

The invention discloses a method for implementing a voice integrated circuit. A noise reduction unit is arranged between a digital-analog conversion unit and a speaker power operator; a main channel of the noise reduction unit is a variable band pass switching capacity filter; a secondary channel of the noise reduction unit is a signal analysis control unit; input ends of the main channel and the secondary channel are connected with an output end of the digital-analog conversion unit respectively; the output end of the main channel is connected with the speaker power amplifier; and the output end of the secondary channel is connected with a control signal input end of the main channel to adjust the bandwidth of the main channel. The method comprises the steps of: performing high-pass filtering on a voice signal which is subjected to analog-to-digital conversion by the secondary channel through the high pass filter; performing analog-digital conversion on the filtered voice signal by using an A / D converter; inputting the signal to a central processing unit; performing peaking operation and average calculating operation on the voice signal which is subjected to analog-to-digital conversion in the central processing unit; controlling the output frequency of a controllable clock source by using the operation result; and controlling the bandwidth of the variable band pass switching capacity filter by the controllable clock source.

Description

technical field [0001] The invention discloses a noise reduction method, in particular to a method for realizing the noise reduction function in a voice integrated circuit. Background technique [0002] Voice equipment is ubiquitous in people's daily life. With the development of science and technology, the integration level of circuits is getting higher and higher, and the functions are becoming more and more powerful. Please see attached figure 1 At present, the general voice integrated circuit includes a voice signal acquisition and conversion unit, a signal encoding / decoding unit, a digital-to-analog conversion unit, and a central processing unit, etc., and a microphone or other audio signal source inputs an audio signal to the signal acquisition and conversion unit, and the signal acquisition and conversion unit The converted audio signal is input to the signal encoding / decoding unit, and then input to the digital-to-analog conversion unit after being coded and decoded...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the above-mentioned shortcomings of the speech integrated circuit in the prior art without noise reduction function or having many filter elements for noise reduction, poor precision, difficult integration, and high cost, the present invention provides a new speech integrated circuit The realization method of the noise reduction function in the middle is that a noise reduction unit is added between the digital-to-analog conversion unit and the loudspeaker power amplifier, the main channel of the noise reduction unit adopts a variable band-pass switched capacitor filter, and the secondary channel of the noise reduction unit adopts signal detection and analysis In the control unit, the input ends of the main channel and the auxiliary channel are respectively connected to the output ends of the digital-to-analog conversion unit, the output end of the main channel is connected to the input end of the power amplifier, and the output end of the auxiliary channel is connected to the control signal input end of the main channel, Adjust the bandwidth of the main channel

Images