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Audio play device and audio play control method

A technology for audio playback and signal control, applied in digital recording/reproduction, signal processing to reduce distortion, etc., can solve problems such as loud noise, signal variation, speaker damage, etc., and achieve the effect of ensuring normal operation

Inactive Publication Date: 2009-11-18
LENOVO (BEIJING) LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the input signal of V1b changes near the voltage value set by R5b and R6b, the power amplifying part 20 will be turned on and off frequently, which will lead to two bad results: 1. Due to the frequent switching of the power amplifying part , will produce a strong POP sound, resulting in a lot of noise and may cause damage to the speaker; 2. Since the power amplifier device has a certain reaction time from on to off and from on to off, frequent switching power amplifier components 20 will cause the power amplifying part 20 to be unable to work in the normal amplifying state all the time, because the input sound and the amplified output signal are mutated

Method used

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  • Audio play device and audio play control method
  • Audio play device and audio play control method
  • Audio play device and audio play control method

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Embodiment Construction

[0013] like figure 2 As shown, the audio playback device according to the present invention includes an audio driver 11, an audio codec (codec) 12, a GPIO (general input / output) 17, an audio detection circuit 13, and a hardware normal audio logic judgment circuit 14 , a control circuit 15 and an audio power amplifier circuit 16.

[0014] When the application software will play an audio file, the application software will decode the format of the audio file accordingly, call the audio driver 11 through the OS kernel (operating system kernel), and send the audio data to the audio driver 11. The audio driver 11 performs mixing and other sound effect adjustments on the transmitted audio data, and then transmits the digital audio data to the hardware, that is, the audio codec 12 for processing. Therefore, it can be judged by the audio driver 11 whether there is audio data input. When judging that there is no audio data input, the audio driver 11 invokes the GPIO 17 to send a fir...

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PUM

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Abstract

The invention provides an audio play device and audio play control method. The audio play device includes an audio power amplification circuit and control circuit, thereinto, when said control circuit receives the first control signal, it closes said audio power amplification circuit or makes said audio power amplification circuit work in energy-saving mode, said first control signal is control signal which is generated by transferring the GPIO when audio drive judges it does not receive audio data, when audio coder and decoder judges that it does not receive digit audio signal or when hardware normal audio logic judging circuit confirms that swing of analogue audio signal during a definite time is smaller than preset threshold value.

Description

technical field [0001] The invention relates to an audio playing device and an audio playing control method. Background technique [0002] The power amplifier chip mainly amplifies the power of low-power audio signals to drive speakers or earphones. [0003] The current power amplifier chip will be in the working state no matter whether there is a sound signal output or not after it is powered on, unless there is external human control. For example: some chips (TPA0312) must be externally given a SHUTDOWN signal to make the chip enter the energy-saving mode. When the general equipment is working, even if there is no sound output, it cannot enter the energy saving mode. For example, when people use a notebook computer or a desktop computer, even if there is no audio signal output, the power amplifier chip cannot enter the power saving mode. [0004] The existing method of controlling the power amplifier chip according to the audio signal is only determined by simply detect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B20/10G11B20/22
Inventor 胡兆伟
Owner LENOVO (BEIJING) LTD
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