Method and apparatus for recording and reproducing an analog sig

Details Method and apparatus for recording and reproducing an analog sig Method and apparatus for recording and reproducing an analog sig

1983-04-14

1985-06-11

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

Recording for changing duration, frequency or redundant...

360 32, G11B 560

Patent

active

045232377

ABSTRACT:
For recording an analog signal by means of two recording heads equally spaced on a rotating drum, a magnetic tape is wrapped guide drum with an angular range of 90.degree., so that there are recording periods when a head is tracing the tape and free periods when neither head is tracing the tape. The analog signal to be recorded is converted to pulse code modulated (PCM) signals having real time periods longer than the recording periods. The free periods, during which neither head is in contact with the recording medium, are used to add redundant data such as parity data and a cyclic redundancy check (CRC) code to the PCM signals. The composite signal, which represents a PCM signal having the parity data and CRC code added to it, is time-base compressed to a period substantially equal to the recording periods and is recorded on the recording medium by one of the heads during its recording period. To reproduce the signal, the same head arrangement is used. The free periods are used for error correction and the error-corrected signal is time-base expanded to occupy the original or real time signal period and then reconverted into the corresponding analog signal.

REFERENCES:
patent: 4246615 (1981-01-01), Shirashi et al.
patent: 4477844 (1984-10-01), Nakano

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