Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1990-03-27
1991-12-10
Shepperd, John W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358145, H04N 7093
Patent
active
050722972
ABSTRACT:
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.
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R. Futscher, Radio-Electronics p. 12 Jun. 1990.
Enami Kazumasa
Honda Minoru
Hoshino Yoshiharu
Kanazawa Masaru
Kurita Taiichiro
Nippon Hoso Kyokai
Shepperd John W.
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