FM decoding chip, stereo decoding system and method

A decoding system, stereo technology, applied in the field of stereo decoding system, can solve the problem that the stereo signal and the synchronous signal are large, the left channel signal and the right channel signal cannot be clearly separated, so as to increase the degree of separation and reduce the phase drift Effect

Inactive Publication Date: 2012-05-09
MEDIATEK INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the delay between the stereo signal and the sync signal is too large, the left and right channel signals cannot be clearly separated

Method used

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  • FM decoding chip, stereo decoding system and method
  • FM decoding chip, stereo decoding system and method
  • FM decoding chip, stereo decoding system and method

Examples

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Embodiment Construction

[0017] figure 1 It is a block diagram of a stereo decoding system according to an embodiment of the present invention. The FM demodulator 10 receives and demodulates the radio frequency signal to generate a stereo multiplexed signal, wherein the stereo multiplexed signal includes a pilot signal, a left channel signal and a right channel signal. The bandpass filter 11 has a center frequency fc, and a bandwidth between frequencies fa and fb, where fa is the low frequency cutoff frequency of the bandpass filter 11 and fb is the high frequency cutoff frequency of the bandpass filter 11 . The oscillator 12 generates and transmits a first signal with a frequency fx between the frequencies fa and fb to the bandpass filter 11 to filter out the pilot signal from the stereo multiplexed signal. The oscillator 12 also transmits the first signal to the digital correction circuit 14 to correct the frequency fx of the first signal to the center frequency fc. Please refer to figure 2 , ...

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Abstract

A stereo decoding system comprises an oscillator, a bandpass filter, a PLL unit and a stereo decoder. The oscillator generates a first signal with a center frequency. The bandpass filter receives a stereo multiplexed signal and the first signal to filter out a pilot signal. The PLL unit receives the pilot signal to generate a PLL output signal. The stereo decoder receives the stereo multiplexed signal and the PLL output signal to separate a left channel signal and a right channel signal from the stereo multiplexed signal.

Description

technical field [0001] The invention relates to a stereo decoding system, in particular to a stereo decoding system and method capable of reducing phase drift during signal transmission and its FM decoding chip. Background technique [0002] Due to the characteristics of frequency modulation (hereinafter referred to as FM) signals, such as better suppression ability and longer transmission distance than amplitude modulation (amplitude modulation) signals, an advantage of FM signals is that they can be transmitted in stereo. When a stereo decoding system receives and decodes a stereo signal, a synchronization signal is needed to separate the left channel signal and the right channel signal from the stereo signal. The degree of separation of the left and right channel signals is determined by the delay between the stereo signal and the sync signal, such as phase delay or frequency delay. If the delay between the stereo signal and the sync signal is too large, the left and rig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04H40/63H04B1/16
CPCH04B1/1653H04H40/63
Inventor 张湘辉黄志坚陈界弘
Owner MEDIATEK INC
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