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Method for improving stereo crosstalk

A stereo and separation technology, applied in the field of communication, can solve the problems of weakening the stereo effect of sound and affecting the user experience, etc., and achieve the effect of improving stereo separation, reducing requirements, and simplifying design

Inactive Publication Date: 2011-04-20
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If the crosstalk between the two channels is large, the three-dimensional effect of the sound will be weakened, which will undoubtedly affect the user experience

Method used

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  • Method for improving stereo crosstalk
  • Method for improving stereo crosstalk
  • Method for improving stereo crosstalk

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Embodiment Construction

[0035] First set forth the principle of the inventive method:

[0036] The demodulated FM signal contains three different components, and its spectrogram is as follows figure 1 shown. Specifically, the demodulated FM signal includes: the sum signal M=L+R representing the stereo left and right channels, which occupies the frequency range from 0 to 15KHz; as required by FCC (Federal Communications Commission) regulations In that way, at 19KHz frequency, there is a 19KHz pilot signal; centered at 38KHz frequency, which is twice the frequency of the pilot signal, the information S=L-R of the left channel minus the right channel is modulated on the DSB- of the suppressed carrier In the SC (double sideband modulation) signal, its frequency band occupies a 30KHz range from 23KHz to 53KHz.

[0037] A traditional stereo decoder restores the sum and difference signals of the left and right channels through the pilot signal, and finally mixes these two signals to obtain the left and ri...

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Abstract

The invention provides a method for improving stereo crosstalk. The method adds a phase compensation module in a stereo decoding circuit to reduce the phase error between a pilot signal and a receivedstereo signal, and improve the stereo crosstalk. The phase compensation module consists of a phase error calculation circuit with a symmetrical internal structure, the circuit works out a compensation factor needed to compensate the phase error, and the decoded stereo signal is compensated by the compensation factor, so that the stereo crosstalk is optimized.

Description

technical field [0001] The invention relates to the communication field, in particular to a method for improving stereo separation in FM (frequency modulation) receiver stereo decoding technology. Background technique [0002] At present, FM stereo receivers are widely used in products such as mobile phones, MP3 and FM broadcasting. Traditional FM radio broadcasts are transmitted in a standard stereo scheme. The standard stereo signal spectrogram is as follows figure 1 shown. As shown in the figure, the stereo signal is composed of the sum signal M=L+R of the left and right channels, the difference signal S=L-R of the left and right channels, and a 19KHz pilot signal. In addition, the stereo signal may also contain RDS (Radio Data System) signals or RBDS (Radio Broadcast Data System) signals modulated at 57 KHz. [0003] The traditional stereo decoding method first needs to recover the 19KHz pilot signal, and obtain the 38KHz stereo carrier through the pilot signal. Thi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04S3/00H04H40/45
Inventor 张萌戴志生高星吴建辉汤佳健王声扬徐勐丁小军朱华成陆生礼
Owner SOUTHEAST UNIV