Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1987-11-30
1990-03-27
Griffin, Robert L.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
307266, 328 58, 375 22, 455617, 455618, H04B 900
Patent
active
049125249
ABSTRACT:
The invention relates to a system to transmit digital signals reproduced from a compact disk player, a digital audio tape recorder or the like. In order to increase the S/N ratio of transmission of the digital signals, the occurrence probability of data to be transmitted is made low and light emission time of a light emission element is made small, and the peak value of emission is increased corresponding to the above reduction. As a result, the S/N ratio can be increased in the same transmission band as that in the prior art. In order to reduce the occurrence probability of data, a method of generating pulses at the leading edge and the trailing edge of a pulse signal or a method of compressing data is provided.
REFERENCES:
patent: 4151407 (1979-04-01), McBride
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patent: 4354278 (1982-10-01), Clarke
patent: 4451916 (1984-05-01), Casper et al.
patent: 4524462 (1985-06-01), Cottatelucci
patent: 4563774 (1986-01-01), Gloge
patent: 4623887 (1986-11-01), Welles
Nagai Yutaka
Nakamura Masafumi
Takeuchi Tosifumi
Beek L. Van
Griffin Robert L.
Hitachi , Ltd.
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