Multi-parallel-channel error checking
PCM Recording and reproducing system
Single track audio-digital recorder and circuit for use therein having error correction
Signal recording method and apparatus Patent #: 4146099
ApplicationNo. 05/957270 filed on 11/03/1978
US Classes:714/758, Error correcting code with additional error detection code (e.g., cyclic redundancy character, parity)360/13, RECORD EDITING360/32, CONVERTING AN ANALOG SIGNAL TO DIGITAL FORM FOR RECORDING; REPRODUCING AND RECONVERTING360/53, Data verification369/47.16, Of plural interrelated channels369/59.2, Binary signal phase processing369/59.22, By interpolating or maximum likelihood detecting369/59.25, Format arrangement processing for auxiliary information386/48For synchronization signal
ExaminersPrimary: Atkinson, Charles E.
Attorney, Agent or Firm
International ClassesG11B 20/10 (20060101)
G11B 27/036 (20060101)
G11B 27/28 (20060101)
G11B 20/18 (20060101)
G11B 27/031 (20060101)
G11B 27/032 (20060101)
AbstractAn audio signal is sampled, quantized and the values are stored in a specific digital data block/sub-block format on alternate tracks of a recording medium. The block/sub-block format provides an inherent simplification of error correction techniques, and consists of dividing the digital audio data into groups of digital words, and recording alternate words on separate tracks in the medium. Cyclic redundancy check characters, synchronization, and parity information are selectively interspersed with the data to define sub-blocks which in turn are combined into separate blocks of the block/sub-block arrangement. On reproduce, any errors, dropouts, etc., are detected and corrected or concealed to reconstitute the original audio signal. Editing is facilitated by the separated block arrangement which allows entering and exiting the record mode without destroying any data.