发明授权
US5072297A Method and system for transmitting and receiving PCM audio signals in
combination with a video signal
失效
与视频信号结合发送和接收PCM音频信号的方法和系统
- 专利标题： Method and system for transmitting and receiving PCM audio signals in combination with a video signal
- 专利标题（中）： 与视频信号结合发送和接收PCM音频信号的方法和系统
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申请号： US499874申请日： 1990-03-27
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公开(公告)号： US5072297A公开(公告)日： 1991-12-10
- 发明人: Masaru Kanazawa , Taiichiro Kurita , Kazuhiko Shibuya , Taiji Nishizawa , Yutaka Tanaka , Minoru Honda , Kazumasa Enami , Haruo Okuda , Hideki Suganami , Yoshiharu Hoshino , Toshiyuki Takegahara , Kaoru Watanabe
- 申请人： Masaru Kanazawa , Taiichiro Kurita , Kazuhiko Shibuya , Taiji Nishizawa , Yutaka Tanaka , Minoru Honda , Kazumasa Enami , Haruo Okuda , Hideki Suganami , Yoshiharu Hoshino , Toshiyuki Takegahara , Kaoru Watanabe
- 申请人地址： JPX Tokyo
- 专利权人： Nippon Hoso Kyokai
- 当前专利权人： Nippon Hoso Kyokai
- 当前专利权人地址： JPX Tokyo
- 主分类号： H04N7/04
- IPC分类号： H04N7/04 ; H04N7/088
摘要：
A method and system for multiplexing additional audio information in the form of pulse code modulation (PCM) audio signals onto a television signal. The PCM audio signal is time multiplexed into scanning retrace intervals of the video signal. At a receiver, the bit error rate of the decoded PCM audio signal is compared with a threshold so as to switch the audio output from the PCM audio signal to a conventional FM demodulated audio signal when the bit error rate exceeds the predetermined threshold. In this way, the benefits of both PCM audio and FM audio can be obtained by utilizing the higher immunity of FM signals in low signal-to-noise ratio environments, while the high fidelity PCM audio signal is utilized when the signal-to-noise ratio environment is relatively high.
公开/授权文献
- US3980619A Polyesterification 公开/授权日：1976-09-14
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