Dynamic magnetic information storage or retrieval – Manual input recording
Patent
1976-03-24
1977-12-13
Cardillo, Jr., Raymond F.
Dynamic magnetic information storage or retrieval
Manual input recording
358 4, 358138, 358147, 360 24, 360 27, 360 32, 360 33, H04N 579, H04N 5745
Patent
active
040632903
ABSTRACT:
Apparatus for directly recording television signals on a magnetic medium strips out sync and blanking information. Low frequency components of the television signals are time compressed, i.e. frequency shifted, and recorded as a substitute for the stripped-out sync and blanking information. Thus, high frequency components of each video line are recorded, followed by that line's low frequency components, thereby facilitating the playback of low frequency information. The low frequency video information is time compressed sufficiently to provide time, during the time slot which corresponds to sync and blanking information, for the recording of reference signal information. During playback, the reference signal information is employed to set the gain of the playback circuit. In time compressing the low frequency information, the video signal content of a line is sampled at a predetermined rate. Each sample is then quantized for purposes of improving playback signal-to-noise ratio, i.e. the effect of tape modulation, and other, noise is nullified by sample quantization. To assure against the loss during playback of significant low frequency signal information, the quantization bits are rearranged according to their significance, bits of higher significance being recorded in proximity to the reference signal information, and vice versa.
REFERENCES:
patent: 2850574 (1958-09-01), Kretzmer
patent: 3335218 (1967-08-01), Johnson
patent: 3392233 (1968-07-01), Houghton
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patent: 3723643 (1973-03-01), Suzuki et al.
patent: 3781463 (1973-12-01), Vanden Bussche
patent: 3821797 (1974-06-01), Suzuki et al.
Granger Edward Maurice
Metildi Frederic Howell
Cardillo, Jr. Raymond F.
Cody Robert F.
Eastman Kodak Company
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