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Plosive eliminating circuit of audio system and mobile communication terminal

An audio system and elimination circuit technology, applied in the direction of telephone communication, transducer circuit, electrical components, etc., can solve the problem that the output delay hardware solution is not suitable for complex audio systems, etc., to increase hardware costs, improve sound quality, achieve easy results

Inactive Publication Date: 2010-07-28
QINGDAO HISENSE MOBILE COMM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] In order to solve the problem that the software solution of the existing audio system suppresses the POP sound, there is an output delay, and the hardware solution is not suitable for a complex audio system, a newly designed audio system POP sound elimination circuit is proposed, which is not only applicable to any Structural audio system with simple circuit design and low cost will not cause system output delay

Method used

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  • Plosive eliminating circuit of audio system and mobile communication terminal
  • Plosive eliminating circuit of audio system and mobile communication terminal
  • Plosive eliminating circuit of audio system and mobile communication terminal

Examples

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Embodiment 1

[0038] Embodiment one, see Figure 4 As shown, the audio system of this embodiment is composed of audio processing circuits, DC blocking capacitors C6023 / C6026, and electroacoustic devices. Wherein, the audio signal output by the audio processing circuit may be a single-ended monophonic signal or a single-ended stereo signal. In this embodiment, the single-ended stereo signals MIX_L and MIX_R are taken as an example for illustration. A voltage clamping circuit is set on the audio transmission channel that transmits the single-ended stereo signal MIX_L, MIX_R, such as Figure 4 As shown, the voltage clamping circuit composed of voltage dividing resistors R6003, R6005 and DC power supply VMSMP is connected to the transmission channel for transmitting the left channel single-ended audio signal MIX_L, that is, after the voltage dividing resistors R6003 and R6005 are connected in series, one end is connected to the DC power supply VMSMP, the other end is grounded, and its voltage...

Embodiment 2

[0046] Embodiment two, see Figure 5 As shown, the audio system of this embodiment is composed of main parts such as audio processing circuit, audio amplifier U2 / U3 and electro-acoustic devices. Wherein, the audio signal output by the audio processing circuit may be a single-ended audio signal, such as a single-ended stereo signal MIX_L, MIX_R; or a differential audio signal, such as AUXOP, AUXON. Since the more common audio amplifiers in the industry are in the form of differential input, such as Figure 5 As shown in the audio amplifiers U2 and U3, if the DC bias voltages of the two signals at the differential input terminals are inconsistent, the audio amplifiers U2 and U3 will generate POP sounds at the moment of switching. If the audio amplifiers U2 and U3 directly receive the conventional differential audio signals AUXOP and AUXON, since the DC bias voltages in the differential audio signals AUXOP and AUXON are equal, no POP sound will be generated when the audio amplif...

Embodiment 3

[0051] Embodiment three, see Figure 6 As shown, with the increasingly powerful functions of mobile phones, many current high-end mobile phones have complex audio systems, such as supporting MP3, MP4, FM audio broadcasting and other playback functions, so it is necessary to fully consider the output forms of various audio signals.

[0052] Such as Figure 6As shown, the voice signal and key tone during the mobile phone call are output in the form of differential mono signal AUXOP, AUXON and single-ended mono signal EAR20 through the audio codec CODEC1 integrated in the main chip; in MP3 and MP4 files The audio signal can be processed by the audio codec CODEC2 and output in the form of single-ended stereo signals HPOUTR and HPOUTL; while for FM broadcasting, it can be processed by the audio codec CODEC3 and output in the form of single-ended stereo signals FM_OUTR and FM_OUTL output. Among them, the single-ended mono signal EAR20 output through CODEC1 and the single-ended ste...

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Abstract

The invention discloses a plosive eliminating circuit of an audio system and a mobile communication terminal. The plosive eliminating circuit includes an audio processing circuit, an electroacoustic device and a stopping condenser; audio signals output by the audio processing circuit are output by an audio transmission channel to the stopping condenser; AC signals are output to the electroacoustic device and transformed into sound signals for output after DC bias voltage in the audio signals is isolated by the stopping condenser; a voltage clamp circuit connected on the audio transmission channel is used for clamping a DC level of the audio transmission channel on the level of the DC bias voltage of the transmitted audio signals. As the voltage clamp circuit is smartly designed on the audio signal transmission channel, the invention eliminates plosives output by the electroacoustic device and improves the sound effect quality of the audio system. The plosive eliminating circuit of the invention has simple structure, has no additional hardware cost, cannot cause such problems as output delay and the like, and is suitable for promotion and application in the mobile communication terminals such as cell phones and palm computers.

Description

technical field [0001] The invention belongs to the technical field of audio processing, and in particular relates to a processing circuit for eliminating plosive noise generated by an audio system and a mobile communication terminal designed using the plosive noise elimination circuit. Background technique [0002] The POP sound of the audio system (usually translated into popping sound in Chinese) is mainly caused by the sudden change of the DC bias voltage of each audio signal, resulting in a spike at the DC blocking capacitor connected to the electroacoustic device on the output side. These pulse signals contain rich frequency components, and the noise with a frequency between 20Hz and 20KHz can be heard by the human ear after being converted into a sound signal output by the electro-acoustic device. The greater the voltage change and the shorter the time, the more obvious the output POP sound. [0003] For a simple audio system, the voltage change mainly comes from the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R3/00H04M1/725
Inventor 王海盈
Owner QINGDAO HISENSE MOBILE COMM TECH CO LTD
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