Signal compression recording and reproducing method
First Claim
1. A signal compression recording method for changing a signal into a physical quantity corresponding to an amplitude of said signal and then recording said signal onto a recording medium, comprising the steps of:
- obtaining upper and lower deviation limits according to attributes of a waveform representing said signal;
detecting an amplitude of said signal at a reference time, and a continuous period defined from the reference time to a deviation time at which an amplitude variation quantity deviates from the upper and lower deviation limits;
repeatedly detecting the amplitude of the signal of a current reference time and the continuous period by repeating said detecting step making the deviation time as a new reference time; and
recording the amplitude of the signal and continuous period of the signal at the reference time obtained from said detecting step and said repeatedly detecting step.
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Abstract
Disclosed is a signal compression recording and reproducing method for cases wherein signals of similar frequency ranges occur sequentially. The method compresses a signal to record it without conversion into digital data, and then to reproduce the thus-compressed signal. The signal compression recording method determines a predetermined range, and detects an amplitude of a signal at a starting point, and a continuous period that the amplitude variation quantity from the starting point lasts within the upper and lower deviation limits, thereby recording the amplitude of the signal at the point and the continuous period. The signal reproducing method obtains the amplitude of the next signal and the current signal according to the state value, and reproduces the signal by the equation, ##EQU1## where m=1, 2, 3 . . . , am ε{a1, a2, a3 . . . } (amplitude of the reproduced signal); nm ε{n1, n2, n3 . . . } (continuous period of the reproduced signal); N=1, 2 . . . , nm ; and bm (N) is the amplitude of the reproducing signal.
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Citations
7 Claims
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1. A signal compression recording method for changing a signal into a physical quantity corresponding to an amplitude of said signal and then recording said signal onto a recording medium, comprising the steps of:
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obtaining upper and lower deviation limits according to attributes of a waveform representing said signal; detecting an amplitude of said signal at a reference time, and a continuous period defined from the reference time to a deviation time at which an amplitude variation quantity deviates from the upper and lower deviation limits; repeatedly detecting the amplitude of the signal of a current reference time and the continuous period by repeating said detecting step making the deviation time as a new reference time; and recording the amplitude of the signal and continuous period of the signal at the reference time obtained from said detecting step and said repeatedly detecting step.
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2. A method for reproducing a signal, comprising the steps of:
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comparing an amplitude of a current signal with an amplitude of a later signal to determine a state function where an amplitude of the reproduced signal is represented as one of a1, a2, a3, a4, . . . , and a reproduced continuous period is expressed as one of n1, n2, n3, n4, . . . ; corresponding one of upper and lower deviation limits to a state deviation SA according to the state function obtained from said comparing step; and restoring the reproduced signal at the continuous period where the reproduced signal lasts, according to the equation ##EQU6## where N=1, 2, 3 . . . , nm ;
m=1, 2, 3 . . . ; and
bm (N) denotes the amplitude of a signal restored by the amplitude am and the continuous period nm of the reproduced signal. - View Dependent Claims (3)
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4. A method for compressing received signals prior to recordation, said method comprising the steps of:
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detecting amplitudes of said received signals at a reference time, further detecting corresponding continuous periods defined as a time gap between said reference time and a deviation time, said deviation time occurring when one of said amplitudes of said received signals deviates from an amplitude determined at said reference time by one of an upper deviation limit and a lower deviation limit; recording the detected amplitudes and corresponding continuous periods of said received signals; and reproducing said received signals in response to the recorded amplitudes and the corresponding continuous periods. - View Dependent Claims (5, 6, 7)
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Specification