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Output control device of pulse width modulated inverter

A technology of pulse width modulator and output control, applied in the direction of pulse duration/width modulation, DC amplifier with modulator-demodulator, duration/width modulation pulse demodulation, etc., which can solve the problem of sound quality deterioration, etc. question

Inactive Publication Date: 2006-04-12
SONIX TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Therefore, the known method of reducing the volume will highlight the background noise and make the sound quality significantly worse

Method used

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  • Output control device of pulse width modulated inverter
  • Output control device of pulse width modulated inverter
  • Output control device of pulse width modulated inverter

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Embodiment Construction

[0027] The present invention proposes a new framework, which adjusts the volume by adjusting the output pulse level, so as to improve the problem of low-volume sound quality deterioration and achieve the purpose of improving sound quality.

[0028] see Figure 4 , Figure 4 It is a schematic diagram of the application environment of the output control device 40 of the present invention. Figure 4 What is drawn is to use the output control device 40 of the present invention as volume output control. Before the sound signal is output, the pulse code modulation data (Pulse Code Modulation data, PCM data) representing the sound signal must be processed by the pulse code to pulse width converter (PCM-to-PWM converter) 14, and the pulse code The modulated data is converted to a pulse width modulated signal. Then, the output control device 40 of the present invention receives the pulse width modulation signal and at the same time receives the external volume control. Through the ...

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Abstract

The invention relates to an output control device of a pulse width modulator, comprising: a control signal generator for generating a digital control signal; a digital-to-analog converter for outputting a predetermined level according to the digital control signal; an output circuit comprising a Negative feedback circuit, the negative feedback circuit includes an amplifier combination and a plurality of switching elements for receiving the pulse width modulation signal and receiving the predetermined level by the negative feedback circuit, and when the pulse width modulation signal is logic "0" , the switching element will make the amplifier non-conducting and the negative feedback circuit will not work, so as to control the level of the pulse width modulation signal at a basic level; when the pulse width modulation signal is logic "1", the switching element The negative feedback circuit can be started to control the level of the pulse width modulation signal at the predetermined level; the present invention adjusts the volume by changing the amplitude level of the output pulse; better sound quality can be obtained when the volume is output at a low volume, As a result, richer sound can be played.

Description

technical field [0001] The invention relates to an output control device of a pulse width modulator, in particular to an output control device capable of adjusting the output amplitude of a pulse width modulation signal. Background technique [0002] The pulse width modulation (Pulse Width Modulation, PWM; hereinafter referred to as pulse width modulation) sound output mode has been widely used in consumer products, especially in portable electronic products. In portable products that use batteries as energy sources, power consumption has always been one of the most important considerations. The biggest advantage of the pulse width modulation output method is its high power efficiency. [0003] see figure 1 , figure 1 It is a schematic diagram of a known pulse width modulation sound output device 10 . The conventional pulse width modulation sound output device 10 includes a digital volume controller 12 , a pulse code modulation to pulse width modulation converter (PCM-to-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F3/38H03K7/08H03K9/08
Inventor 魏维信何昇宜张荣麟
Owner SONIX TECH
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