Output control device of pulse width modulated inverter

A technology of output control and pulse width modulation, 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: 2004-10-13
SONIX TECH
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  • Claims
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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 The code modulated data is converted into a pulse width modulated signal. Then, the output control device 40 of the present invention receives the PWM signal and at the same time receives the external volume control. Through the operation of the ...

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Abstract

The invention refers to a kind of output control device of a kind of pulse width regulator, which includes: a control signal generator for generating a digital control signal; a digital / analog converter for outputting a preset level according to the digital control signal; a output circuit including a negative feedback circuit for receiving the pulse width regulating signal and using the negative feedback circuit to receive the preset level, and when the pulse width regulating signal is logic 'zero', the negative feedback circuit doesn't act, in order to control the pulse width regulating signal level at the base level; when the pulse width regulating signal is logic 'one', starts the negative feedback circuit in order to control the level of the pulse width regulating signal at preset level; the invention adjusts the volume through changing the vibration amplitude of output pulse; when outputs a small volume, the music quality is good, and it can play out voice with rich contents.

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 method 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 sound output device 10 of known pulse width modulation comprises a digital volume controller 12, a pulse code modulation to pulse width modulation converter (PCM-to-PW...

Claims

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Application Information

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IPC IPC(8): H03F3/38H03K7/08H03K9/08
Inventor 魏维信何昇宜张荣麟
Owner SONIX TECH
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