Pulse-code modulation signal processing circuit
First Claim
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1. A signal processing circuit for recording PCM signals, comprising:
- A/D coverting means for sampling at a predetermined frequency analog signals to be recorded and converting sampled signals into digital signals forming sample words;
mode determining means for generating a first mode signal when a sample word from the A/D converting means consists of N bits, where N is a positive integer, and a second mode signal when a sample word from the A/D converting means consists of N+M bits, where M is a positive integer;
error correction word generating means connected to said A/D converting means and mode determining means for generating, in response to a first mode signal, K+L error correction words, each consisting of N bits, and where K and L are positive integers, for a predetermined number of N-bit sample words and for generating, in response to a second mode signal, K error correction words each consisting of M+N bits for the same number of (M+N)-bit words as that of the N-bit sample words;
first memory means connected to said A/D converting means and said error correction word generating means for interleaving error correction words among the sample words corresponding thereto;
arranging means to desired PCM signals connected to said first memory means and mode determining means for allotting, in response to a first mode signal, first by said predetermined number of N-bit sample words and then secondly the K+L error correction words to one horizontal scanning segment of a television signal and for dividing, in response to a second mode signal, each of the sample words and error correction words into an M-bit component and an N-bit component and then allotting to the horizontal scanning segment the M-bit components of said predetermined number of sample words, the M-bit components of K error correction words, the N-bit components of said predetermined number of sample words, and the N-bit components of K error correction words in that order, thereby allotting N-bit components of said predetermined number of said sample words and the N-bit components of K error correction words to a slot to which L error correction words are allotted in response to a first mode signal; and
means for recording on a video tape the PCM output signals from said arranging means and mode determining means in a form which is adapted to a data format for the television signal.
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Abstract
A PCM signal processing circuit records a predetermined number of PCM signals and also parity signals and a CRC signal after conversion into a signal having a data format conforming to the television signal with a VTR and detects the PCM signals from the reproduced signal from the VTR. In this PCM signal processing circuit, when the preset bit number of the PCM signals is greater than a reference bit number, the number of parity signals is reduced, and extra bit portions of the individual PCM signals are allotted to the vacant parity signal slot obtained as a result of the reduction of the parity signal number.
120 Citations
10 Claims
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1. A signal processing circuit for recording PCM signals, comprising:
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A/D coverting means for sampling at a predetermined frequency analog signals to be recorded and converting sampled signals into digital signals forming sample words; mode determining means for generating a first mode signal when a sample word from the A/D converting means consists of N bits, where N is a positive integer, and a second mode signal when a sample word from the A/D converting means consists of N+M bits, where M is a positive integer; error correction word generating means connected to said A/D converting means and mode determining means for generating, in response to a first mode signal, K+L error correction words, each consisting of N bits, and where K and L are positive integers, for a predetermined number of N-bit sample words and for generating, in response to a second mode signal, K error correction words each consisting of M+N bits for the same number of (M+N)-bit words as that of the N-bit sample words; first memory means connected to said A/D converting means and said error correction word generating means for interleaving error correction words among the sample words corresponding thereto; arranging means to desired PCM signals connected to said first memory means and mode determining means for allotting, in response to a first mode signal, first by said predetermined number of N-bit sample words and then secondly the K+L error correction words to one horizontal scanning segment of a television signal and for dividing, in response to a second mode signal, each of the sample words and error correction words into an M-bit component and an N-bit component and then allotting to the horizontal scanning segment the M-bit components of said predetermined number of sample words, the M-bit components of K error correction words, the N-bit components of said predetermined number of sample words, and the N-bit components of K error correction words in that order, thereby allotting N-bit components of said predetermined number of said sample words and the N-bit components of K error correction words to a slot to which L error correction words are allotted in response to a first mode signal; and means for recording on a video tape the PCM output signals from said arranging means and mode determining means in a form which is adapted to a data format for the television signal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A signal processing circuit for recording PCM signals, comprising:
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A/D converting means for sampling at a predetermined frequency analog signals to be recorded and converting sampled signals into a digital signal forming sample words; mode determining means for generating a first mode signal when a word from the A/D converting means consists of N bits, where N is a positive integer, and a second mode signal when a word from the A/D converting means consists of N+M bits, where M is a positive integer; error correction word generating means connected to said A/D converting means and mode determining means for generating, in response to a first mode signal, K+L error correction words, each consisting of N bits, and where K and L are positive integers, for a predetermined number of N-bit sample words and for generating, in response to a second mode signal, K error correction words each consisting of M+N bits for the same number of (M+L)-bit words as that of the N-bit words; arranging means connected to said A/D converting means and said error correction word generating means for allotting, in response to a first mode signal, first by said predetermined number of N-bit sample words and secondly K+L error correction words to one horizontal scanning segment of a television signal and for dividing, in response to a second mode signal, each of the sample words and error correction words into an M-bit component and an N-bit component and then allotting to the horizontal scanning segment the M-bit components of said predetermined number of sample words, the M-bit components of K error correction words, the N-bit components of said predetermined number of sample words and the N-bit components of K error correction words in that order, thereby allotting the N-bit components of said predetermined number of sample words and the N-bit components of K error correction words to a slot to which L error correction words are allotted in response to a first mode signal; first memory means for interleaving each word in the horizontal scanning segment output from said arranging means; and means for recording on a video tape the PCM output signals from said first memory means and mode determining means in a form which is adapted to a data format for the television signal. - View Dependent Claims (8, 9, 10)
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Specification