Communications: electrical – Digital comparator systems
Patent
1977-08-11
1979-03-27
Smith, Jerry
Communications: electrical
Digital comparator systems
3401461AG, 360 32, G06F 1110
Patent
active
041460995
ABSTRACT:
Signal recording method and apparatus for efficiently correcting a bit error due to dropout occurred in recording an analog data into a digital data and reproducing the digital data is disclosed. The digital signal converted from the analog signal is divided into a plurality of groups to each of which a parity check bit is added. Record pattern is recorded on a record medium by a recording apparatus in accordance with a regular coding such as FM (frequency modulation) or MFM (modified frequency modulation) coding such that more than one bits in a group are not simultaneously influenced by the dropout, e.g. individual bits in a group are spaced from each other by several tracks. On reproducing, the coded digital signal is decoded into the original digital signal and the dropout is detected utilizing the nature of the regularity of the coding. The parity is checked for each of the groups. In this a single error in the group can be corrected and a double error is supplemented by holding a previous value, whereby the error due to the dropout is reduced.
REFERENCES:
patent: 3921132 (1975-11-01), Baldwin
patent: 3979721 (1976-09-01), Umemoto et al.
A. H. Jones et al., "Digital Stereo Sound Recorder", Wireless World, Sep. 1972, pp. 432-435.
N. Sato, "PCM Recorder-A New Type of Audio Magnetic Tape Recorder", Journal of the Audio Engineering Society, vol. 21, No. 7, pp. 542-548.
Kihara Nobuyoshi
Matsushima Hiroshi
Shimeki Yasuharu
Christopher Scientific Company
Smith Jerry
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