Digital audio signal recorder
First Claim
1. A digital audio signal recorder for digitallizing analog signals in an audio frequency band to pulse-code-modulated signals and for recording the digitallized signals on a recording medium, the recorder comprising:
- first check code generating means for producing a first check code signal by the sume of module 2 per bit of signals for individual pieces of digitallized data sampled at a given time;
memory means connected to said first check code generating means for receiving the output of signals for said pieces of data in a set of signals for the set of pieces constituted by the individual pieces of sampled data and said first check code at addresses in said memory means spaces from each other along a time axis by a time interval greater than the expected time interval of the dropped-out signal;
second check code generating means connected to said memory means and for producing a second check code signal and adding it to the signals of said set; and
a recording means connected to said second check code generating means for receiving the output from said second check code generating meand and recording it on a recording medium.
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Abstract
A digital audio signal recorder for obtaining coded signals having a first check code generator for generating the sum of module 2 for each bit of pieces of predetermined sampled data; and further has a circuit operatively coupled to said generator for arranging the sampled data, a first check code and a second check code at positions spaced on a time axis from each other. This invention also provides a method of generating such a digital audio signal. This invention is advantageous because it makes possible a low rate of redundancy and a simple decode circuit.
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Citations
13 Claims
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1. A digital audio signal recorder for digitallizing analog signals in an audio frequency band to pulse-code-modulated signals and for recording the digitallized signals on a recording medium, the recorder comprising:
- first check code generating means for producing a first check code signal by the sume of module 2 per bit of signals for individual pieces of digitallized data sampled at a given time;
memory means connected to said first check code generating means for receiving the output of signals for said pieces of data in a set of signals for the set of pieces constituted by the individual pieces of sampled data and said first check code at addresses in said memory means spaces from each other along a time axis by a time interval greater than the expected time interval of the dropped-out signal;
second check code generating means connected to said memory means and for producing a second check code signal and adding it to the signals of said set; and
a recording means connected to said second check code generating means for receiving the output from said second check code generating meand and recording it on a recording medium. - View Dependent Claims (2, 3, 4, 5)
- first check code generating means for producing a first check code signal by the sume of module 2 per bit of signals for individual pieces of digitallized data sampled at a given time;
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6. A digital audio signal reproducing apparatus for reproducing digitallized signals produced by digitallizing analog signals in an audio frequency band to pulse-code-modulated signals, producing a first check code signal corresponding to the individual pieces of data sampled at a given time by the sum of module 2 per bit of the individual pieces of data, arranging the signals for the pieces of data in a set constituted by the individual pieces of data and the first check code at addresses spaced from each other along a time axis, and adding a second check code signal to the signals for said set, and which digitallized signals are recorded on a recording medium, said apparatus comprising:
- means for reproducing the recorded signals from the recording medium;
a second check code detecting means connected to said signal reproducing means for checking for the presence of the second check code signal in the reproduced signals;
reproduction memory means connected to said second check code detecting means for arranging the order of the reproduced signals in the original order of signals prior to their arrangement at spaced addresses for recording; and
output means connected to said reproduction memory means for supplying a missing piece of data in a set by the sum of module 2 per bit from remaining signals in said set when said second check code detecting means detects that data is missing due to failure to detect the presence of the second check code signal. - View Dependent Claims (7, 8)
- means for reproducing the recorded signals from the recording medium;
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9. A method of forming digitally coded signals, comprising:
- generating a first check code signal by the sum of module 2 per bit of signals for individual pieces of digitallized data sampled at a given time; and
positioning said signals for the individual pieces of data and for said first check code and a second check code signal for correcting data omission at positions spaced from each other along a time axis by a time interval greater than the expected time interval of the dropped-out signal. - View Dependent Claims (10, 11, 12, 13)
- generating a first check code signal by the sum of module 2 per bit of signals for individual pieces of digitallized data sampled at a given time; and
Specification