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Audio switching circuit and mobile terminal with same

A technology for switching circuits and audio, applied in transducer circuits, electrical components, sub-station voice amplifiers, etc., which can solve problems such as safety, low reliability, and digital switches being burnt out, so as to occupy less space on the circuit board, The effect of saving product space and power independent of each other

Active Publication Date: 2011-05-11
QINGDAO HISENSE MOBILE COMM TECH CO LTD
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AI Technical Summary

Problems solved by technology

[0005] For the audio switching circuit scheme designed with digital switches, although the digital switch can effectively isolate the square wave signal from the Class D audio power amplifier, the biggest disadvantage is that the on-resistance of this switch is extremely large, which will cause problems in practical applications. Generate unnecessary loss on the digital switch, and even burn the digital switch
Therefore, there are technical safety hazards and the reliability is not high
For the audio switching circuit scheme designed with two analog switches, since the analog switch cannot effectively isolate the square wave signal output by the class D power amplifier similar to the digital signal, it can effectively isolate the analog signal output by the earpiece channel.
Therefore, when the speaker channel is sounding, there will be an audio signal coupled to the earpiece channel, which will affect

Method used

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  • Audio switching circuit and mobile terminal with same
  • Audio switching circuit and mobile terminal with same
  • Audio switching circuit and mobile terminal with same

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Embodiment 1

[0024] Embodiment 1. The audio switching circuit of this embodiment uses an analog switch to perform gating control on the analog audio channel that outputs an analog signal. While effectively isolating the analog signal, when a square wave audio signal similar to a digital signal is coupled to the analog When the switch is on, the noise signal can be released to the ground through the grounding resistor connected to the analog switch, so as to realize the effective isolation of the square wave audio signal at the same time, which not only solves the mutual interference problem between the analog audio channel and the square wave audio channel , and can avoid damage to analog switches and other peripheral devices.

[0025] figure 1 It is a schematic block diagram of the design of the audio switching circuit, and a single-pole double-throw analog switch K is used as an example for illustration. Connect the common node COM of the analog switch K to the analog audio channel Au_A...

Embodiment 2

[0030] Embodiment 2. For mobile terminals currently designed with a baseband processing chip integrated with a Class D audio power amplifier and a two-in-one speaker, this embodiment uses a mobile phone as an example to illustrate, and the audio signal output by the Class D audio power amplifier It is a square wave signal similar to a digital signal, which is output by the speaker channel of the baseband processing chip, while the output through the earpiece channel of the baseband processing chip is an analog audio signal. The audio signals output through the two audio channels need to be output through the two-in-one speaker set in the mobile phone. In order to switch and output the two audio channels, this embodiment designs the following figure 2 The audio switching circuit shown. Since the audio signal output by the current baseband processing chip is usually a differential signal, a dual-channel single-pole double-throw analog switch U1 can be selected for circuit desi...

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Abstract

The invention discloses an audio switching circuit and a mobile terminal with the same. The audio switching circuit comprises a single-pole double-throw analog switch for switching and outputting audio signals output through a square wave audio channel and an analog audio channel; the public node of the single-pole double-throw analog switch in the audio switching circuit is connected with the analog audio channel, one path of movable contact is grounded through a resistor, the other path of movable contact is connected with the input end of a loudspeaker through a series stopping condenser, and the input end of the loudspeaker is simultaneously connected with the square wave audio channel; and the square wave audio channel is closed when the analog audio channel outputs audio signals. The analog switch is used reversely; and when the audio signals in a square wave form are output, the signals coupled to the analog audio channel are skillfully released to the ground through a grounding resistor so as to realize effective isolation of square wave audio signals and analog audio signals and prevent a baseband processing chip and the analog switch from being burnt out.

Description

technical field [0001] The invention belongs to the technical field of audio signal processing, and in particular relates to a selection switching circuit for multi-channel audio signals and a mobile terminal designed using the audio switching circuit. Background technique [0002] With the development of mobile communication technology, the baseband processing chips of mobile phones are also developing in the direction of small size, high integration, low power consumption and high performance. In terms of mobile phone audio, due to the high conversion efficiency of Class D audio power amplifiers, the system power consumption is effectively reduced, and now it has become the mainstream of various mobile phone platform applications. Now the baseband processing chips of mainstream mobile phone platforms integrate Class D audio power amplifiers into them to reduce customer development costs, enhance system reliability, and reduce power consumption. For example, Qualcomm's QSC...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R3/00H04M1/60
Inventor 张鹏
Owner QINGDAO HISENSE MOBILE COMM TECH CO LTD
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