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Mobile phone aural signal output circuit

A sound signal and output circuit technology, which is applied in the field of improving the sound quality of the speaker output sound in mobile phones, can solve problems such as poor sound quality and sound attenuation in low frequency bands, and achieve the effect of high-quality sound performance

Inactive Publication Date: 2005-11-02
LG ELECTRONICS (CHINA) R&D CENT CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The conference call mode of the previous mobile phone cuts off the sound signal output through the receiver, and outputs the sound signal through the speaker installed on the outside. At this time, the sound in the low frequency band will be attenuated and cause poor sound quality.

Method used

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  • Mobile phone aural signal output circuit
  • Mobile phone aural signal output circuit
  • Mobile phone aural signal output circuit

Examples

Experimental program
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Embodiment Construction

[0025] image 3 It is a block diagram of an embodiment of the mobile phone sound signal output circuit in the present invention. As shown in the figure, its structure includes: a modem main chipset 31 that performs processing functions for receiving and sending data and sound; Modulation (PCM) is converted into a digital bit stream suitable for transmission, output to the above-mentioned modem main chip set 31, the received sound digital signal is converted into an analog signal output by the modem main chip set 31, only to the receiver 33 during the hands-free mode Output, the codec 32 that outputs to receiver 33 and loudspeaker 35 simultaneously during conference call mode; The sound signal outputted from the side output path of above-mentioned codec 32 is amplified by specified level, output to the third power of loudspeaker 35 Amplifier 34.

[0026] The codec 32 includes: a finite impulse response (FIR) filter 32A for filtering the sound signal output from the modem main ...

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Abstract

The invention relates to the technique enhancing the audio output of the speaker in conference calling mode and improving the output audio quality. The device of the invention includes: a modem main chip set (31) receiving and transmitting the date and the audio; a coder decoder (32) which uses the pulse code modulation (PCM) to transform the audio analog signal to the bitstream fitting for transmitting and outputs to modem main chip set (31), transforming the audio digital signal received from the modem main chip set (31) to the analog signal, in the handfree mode only outputting to the receiver (33) and in the conference calling mode outputting to the receiver (33) and the speaker (35); the third power amplifier (34) amplifying the power of the audio signal outputted by the output route of the said coder decoder (32) according to the assigned level and outputting to the above-mentioned speaker (35).

Description

technical field [0001] The invention relates to a technology for improving the sound quality of the speaker output sound in a mobile phone, in particular, a mobile phone sound signal output circuit that enhances the sound output of the speaker in a conference call mode and improves the sound quality of the output sound. Background technique [0002] Recently, the functions of mobile communication terminals (such as mobile phones) have enhanced multimedia functions in order to comply with the 3rd generation (3G). Among the call functions of the terminals, the conference call function is widely used, and the hands-free function is used at this time. Therefore, a receiver speaker and a loud speaker are built into a terminal using a hands-free phone. Among them, the receiver is used in the form of being closely attached to the user's ear, and the speaker is provided for loudspeaking the phone. [0003] In the hands-free mode, the sound signal is output through the above receive...

Claims

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Application Information

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IPC IPC(8): H04B1/40H04M1/60
CPCH04M1/035H04M1/6016H04M2201/30H04M2250/62
Inventor 申俊秀
Owner LG ELECTRONICS (CHINA) R&D CENT CO LTD
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