Method and system for translating digital signal sampled at variable frequency
First Claim
1. A method of reconverting a digital signal into a signal which is a replica of an original analog signal, said digital signal comprising a series of data set each including a digital sample indicating the amplitude of an analog sample which occurs at clock intervals and a sampling code indicating an integral multiple of the clock interval, said integral multiple being proportional to the interval between successive digital samples corresponding to analog samples occurring approximately at zero crosspoints of the waveform of the original analog signal, comprising:
- (a) detecting a difference in digital quantity between the digital samples of successive equi-spaced data sets between successive zero crossings;
(b) dividing said difference by the sampling code of each data set to derive a digital slope signal;
(c) converting said digital slope signal into an analog slope signal; and
(d) integrating said analog slope signal to generate said replica of the original analog signal.
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Accused Products
Abstract
In a data compression system, a digital signal comprising a series of digital samples and a sampling datum associated with each digital sample is received by a decoder. The sampling datum indicates the sampling interval of the associated digital sample. The decoder includes a microcomputer for storing the digital signal into a memory (M2) and reading each digital sample and the associated sampling datum. The digital sample is divided by the sampling datum to derive a quotient which indicates the slope of the signal to be recovered. The quotient is integrated by an integrator (6b) to provide interpolation between successive sampling points, so that the original signal is approximated by a plurality of line segments.
29 Citations
10 Claims
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1. A method of reconverting a digital signal into a signal which is a replica of an original analog signal, said digital signal comprising a series of data set each including a digital sample indicating the amplitude of an analog sample which occurs at clock intervals and a sampling code indicating an integral multiple of the clock interval, said integral multiple being proportional to the interval between successive digital samples corresponding to analog samples occurring approximately at zero crosspoints of the waveform of the original analog signal, comprising:
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(a) detecting a difference in digital quantity between the digital samples of successive equi-spaced data sets between successive zero crossings; (b) dividing said difference by the sampling code of each data set to derive a digital slope signal; (c) converting said digital slope signal into an analog slope signal; and (d) integrating said analog slope signal to generate said replica of the original analog signal.
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2. A method of reconverting a digital signal into a signal which is a replica of an original analog signal, said digital signal comprising a series of data set each including a digital sample indicating the amplitude of an analog sample which occurs at clock intervals and a sampling code indicating an integral multiple of the clock interval, said integral multiple being proportional to the interval between successive digital samples corresponding to analog samples occurring approximately at zero cross-points of the wavefrom of the original analog signal, comprising:
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(a) detecting a difference in digital quantity between the digital samples of successive equi-spaced data sets between successive zero crossings; (b) converting said difference to an analog value; (c) converting said sampling code to an analog value; (d) dividing the analog value of the step (b) by the analog value of the step (c); and (e) integrating the divided analog value to generate said replica of the original analog signal.
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3. A system for translating a digital signal into a signal which is a replica of an original analog signal, said digital signal comprising a series of data set each including a digital sample indicating the amplitude of an analog sample which occurs at clock intervals and a sampling code indicating an integral multiple of the clock interval, said integral multiple being proportional to the interval between successive digital samples corresponding to analog samples occurring approximately at zero crosspoints of the waveform of the original analog signal, comprising:
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(a) means for detecting a difference in digital quantity between the digital samples of successive equi-time spaced data sets between successive zero crossings; (b) means for dividing said difference by the sampling code of each data to derive a digital slope signal; (c) means for converting said digital slop signal into an analog slop signal; and (d) means for integrating said analog slop signal to generate said replica of the original analog signal. - View Dependent Claims (5, 6, 7, 8)
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4. A system for reconverting a digital signal into a signal which is a replica of an original analog signal, said digital signal comprising a series of data sets each including a digital sample indicating the amplitude of an analog sample which occurs at clock intervals and a sampling code indicating an integral multiple of the clock interval, said integral multiple being proportional to the interval between successive digital samples corresponding to analog samples occurring at or near zero crosspoints of the wavefrom of the original analog signal, comprising:
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(a) means for detecting a difference in digital quantity between the digital samples of successive equi-time spaced data sets between successive zero crossings; (b) first means for converting said difference to a first analog signal value; (c) second means for converting said sampling code to a second analog signal value; (d) means for dividing the analog signal value derived by the first converting means by the analog signal value derived in the second converting means to derive an analog signal representing the quotient of the values of the first and second signal values; and (e) means for integrating the analog quotient signal to generate said replica of the original analog signal. - View Dependent Claims (9, 10)
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Specification