Broadcast equipment of delta-sigma pulse width modulation capable of eliminating distortion

Abstract

The broadcast equipment includes following parts: a delta-sigma pulse width modulation unit is in use for receiving an input signal, which passes through delta-sigma pulse width modulation and generates a signal of pulse width modulation; receiving signal of pulse width modulation, a drive unit generates a drive signal; a loudspeaker unit is in use for receiving a drive signal to generate sound; receiving signal of pulse width modulation, a unit of predicting error value generates a feedback prediction signal based on error data setup in advance. Delta-sigma pulse width modulation unit receives the feedback prediction signal as a feedback signal.

Description

technical field [0001] The present invention relates to a broadcasting device with delta-sigma pulse width modulation, in particular to a broadcasting device with delta-sigma pulse width modulation capable of eliminating distortion. Background technique [0002] figure 1 The broadcasting device 10 exhibits well-known delta-sigma pulse width modulation (sigma-delta PWM). A general Δ-Σ PWM broadcasting device 10 includes a Δ-Σ PWM unit 11 , a driving unit 12 , and a speaker unit 13 . The delta-sigma pulse width modulation unit 11 generates a PWM signal y after receiving the input data, and the PWM signal y is sequence data of 1, 0 or -1. After receiving the PWM signal y, the driving unit 12 generates analog output signals AUDP and AUDN to drive the speaker unit 13 to generate sound. [0003] figure 2 It is a circuit of a general delta-sigma pulse width modulation unit 11 . The Δ-Σ pulse width modulation unit 11 is used to generate a sequence of PWM signals y according to...

AI Technical Summary

Problems solved by technology

[0007] However, the resolution of the general delta-sigma pulse width modulation unit is relatively high, so the analog-to-digital converter must also have a relatively high resolution (for example, more than 16 bits)

However, high-resolution analog-to-digital converters are quite expensive, and if this method is used, the overall circuit cost will be too high

On the other hand, since the noise of the general delta-sigma pulse width modulation unit is higher and the processing speed is faster, the analog-to-digital converter must also have higher noise immunity and faster processing speed, which will increase the difficulty of analog-to-digital converter design

Therefore, if the analog-to-digital converter is used to eliminate the distortion caused by the deformation of the output signal of the drive unit, it will cause problems of high cost and difficult design, so it is not feasible

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