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Stereo playing system for mobile TV

A playback system and mobile TV technology, applied to TV system components, TVs, color TVs, etc., can solve the problems of reduced receiving sensitivity, achieve the effects of preventing the reduced receiving sensitivity, prolonging the playing time of the terminal, and ensuring the quality of reception

Inactive Publication Date: 2007-10-10
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Class D power amplifier has its disadvantages, it will bring strong electromagnetic interference EMI, resulting in reduced receiving sensitivity in certain frequency bands

Method used

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  • Stereo playing system for mobile TV

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Embodiment Construction

[0019] As shown in Fig. 1, mobile TV stereo playback system of the present invention comprises class D power amplifier 1, and the resonant circuit 2 of its output end is respectively connected respective speakers by two pairs of (SPKOUT_R+, SPKOUT_R-) and (SPKOUT_L+, SPKOUT_L-) audio output signal lines , and four groups of RC circuits 3 at the input end are connected in series respectively on (LEFT+, LEFT-) or (RIGHT+, RIGHT-) two pairs of source audio signal differential input lines; the class D power amplifier 1 in the figure specifically adopts TPA2010, and It can be MAX9701 and other devices that meet the requirements.

[0020] Further, the technical measures of the mobile TV stereo playback system of the present invention are specified:

[0021] (1) Capacitors C5~C8 are used as the decoupling of the power amplifier power supply, and are used to increase the power supply ripple rejection ratio PSRR performance of the power amplifier 1, which can be flexibly selected accor...

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PUM

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Abstract

The invention comprises: a D class amplifier; and a resonant circuit between the output of the amplifier and a stereo speaker or a earphone, which is used for removing EMI interference; the self-resonance point of the resonant circuit is at 470 MHZ where the maximum interference is generated; by the resonant circuit, the falling of receiving sensitivity caused by D class amplifier can be avoided.

Description

technical field [0001] The present invention relates to a mobile TV, in particular to a mobile TV stereo playback system which significantly reduces the power consumption of the playback system and prolongs the playback time of the terminal under the premise of ensuring the reception sensitivity and playback effect of the current mobile TV. Background technique [0002] Mobile TV is an emerging technology that enables consumers to watch TV programs conveniently anytime and anywhere. Among many technical standards that can realize this function, DVB-H (Digital Video Broadcasting Handheld Standard) is widely used at present, and there are many terminals in the market, among which TV mobile phones are the most common. In order for users to have a better audio and video experience, the terminal adopts a stereo playback system. Because the power of mobile portable devices is very limited, and the power consumption of the stereo playback system accounts for a large proportion in ...

Claims

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Application Information

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IPC IPC(8): H04N5/60H04R3/00
Inventor 黄旭
Owner ZTE CORP
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