Channel division recording/reproducing apparatus

Details Channel division recording/reproducing apparatus Channel division recording/reproducing apparatus

1980-03-10

1981-08-18

Cook, Daryl W.

Dynamic magnetic information storage or retrieval

Splitting one information signal for recording on plural...

358127, 360 33, H04N 579

Patent

active

042850142

ABSTRACT:
A channel division recording/reproducing apparatus is provided for dividing an input signal into signals for a plurality of channels through an Hadamard transformation, frequency modulating the signals of the respective channels and recording them and, after demodulating the recorded signals for the respective channels, subjecting the demodulated signals to an Hadamard inverse transformation and reproducing the input signal. Out of the Hadamard-transformed signals, the signal on the channel of the minimum frequency band is separated by a filter from the input signal and the separated signal processed by an additional Hadamard transformer and Hadamard inverse transformer and frequency modulated with a modulation index greater than the original signal and with a carrier of a lower frequency. An impovement in signal-to-noise ratio is thereby obtained. When recording a video signal, the "beat" phenomenon between the video signal and carrier signal is reduced while the signal-to-noise ratio of the video signal as a whole is improved.

REFERENCES:
patent: 4048658 (1977-09-01), Nakagawa

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