发明授权
- 专利标题: Demodulating system for multivoice system
- 专利标题(中): 多发系统解调系统
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申请号: US914008申请日: 1986-10-01
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公开(公告)号: US4723287A公开(公告)日: 1988-02-02
- 发明人: Katsumi Tobita , Tamaki Yoshimoto
- 申请人: Katsumi Tobita , Tamaki Yoshimoto
- 申请人地址: JPX
- 专利权人: Alps Electric Co., Ltd.
- 当前专利权人: Alps Electric Co., Ltd.
- 当前专利权人地址: JPX
- 优先权: JPX60-219957 19851002
- 主分类号: H04H1/00
- IPC分类号: H04H1/00 ; H04H40/36 ; H04N5/60 ; H04H5/00
摘要:
A demodulating system for the multivoice TV system, which is constituted so that a tuner is tuned to receive the sum signal and the difference signal of an aural signal and a pilot signal which are transmitted together with a video signal, the selected signal is given to an intercarrier demodulator and an aural signal band-pass filter, the intercarrier demodulator provides a beat signal corresponding to the difference between the video carrier and the sound subcarrier, the beat signal is demodulated to obtain the sum signal, and the sound subcarrier provided by the sound signal band-pass filter is demodulated to obtain the difference signal and the pilot signal. The demodulating system is intended to eliminate disturbing signals included in the composite signal and buzzing, and to obviate the malfunction of the MPX decoder due to the disturbing signal having the same frequency as that of the pilot signal.
公开/授权文献
- US5857745A Vehicle seat 公开/授权日:1999-01-12
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