Error reduction speech communication system
First Claim
1. An error reduction arrangement in a communication system comprising transmitting means including means for receiving an input signal, means for converting said input signal into blocks of coded signals, and means for applying said blocks of coded signals to a transmission medium;
- and receiving means for converting the coded signal blocks from said transmission medium into a replica of said input signal;
CHARACTERIZED IN THAT said transmitting means (180) further comprises feature signal generating means (110,112) responsive to said blocks of coded signals for generating a signal representative of a first set of features of the waveform of said input signal and a signal corresponding to a second set of features of the waveform of said input signal; and
said receiving means (190) further comprises means (153,
157) jointly responsive to the received first waveform feature signal and the received block coded signals for detecting corrupted received coded signals; and
means (160) operative upon detection of each received corrupted coded signal jointly responsive to said received second waveform feature signal and the received block coded signals for modifying the value of said corrupted coded signal to reduce errors in said signal replica.
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Abstract
An arrangement reduces transmission errors in a communication system that includes a transmitter operative to convert an input signal into blocks of coded signals and a receiver operative to convert the coded blocks into a replica of the input signal. In the transmitter, a signal representative of first features of the input signal and a signal corresponding to second features of the input signal are generated. In the receiver, corrupted received coded signals are detected responsive to the first feature signal and the received blocks of coded signals. Each corrupted received coded signal is modified jointly responsive to the received blocks of coded signals and the second feature signal to reduce errors in the input signal replica.
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Citations
37 Claims
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1. An error reduction arrangement in a communication system comprising transmitting means including means for receiving an input signal, means for converting said input signal into blocks of coded signals, and means for applying said blocks of coded signals to a transmission medium;
- and receiving means for converting the coded signal blocks from said transmission medium into a replica of said input signal;
CHARACTERIZED IN THAT said transmitting means (180) further comprises feature signal generating means (110,112) responsive to said blocks of coded signals for generating a signal representative of a first set of features of the waveform of said input signal and a signal corresponding to a second set of features of the waveform of said input signal; and
said receiving means (190) further comprises means (153,
157) jointly responsive to the received first waveform feature signal and the received block coded signals for detecting corrupted received coded signals; and
means (160) operative upon detection of each received corrupted coded signal jointly responsive to said received second waveform feature signal and the received block coded signals for modifying the value of said corrupted coded signal to reduce errors in said signal replica. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- and receiving means for converting the coded signal blocks from said transmission medium into a replica of said input signal;
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13. An error reduction arrangement in a differential pulse code modulation communication system comprising transmitting means including means for receiving an input analog signal, means responsive to said analog signal for producing successive blocks of first coded sample signals, means for converting each block of first coded sample signals into a block of differential pulse code modulation coded signals and means for applying said differential pulse code modulation coded signals to a communication channel;
- and receiving means comprising means for converting each block of differential pulse code modulation coded signals into a block of second coded sample signals, and means responsive to the blocks of second coded sample signals for generating a replica of said analog signal
CHARACTERIZED IN THAT said transmitting means further comprises feature signal generating means responsive to the blocks of differential pulse code modulation coded signals for generating a signal representative of a set of first features of the waveform of the analog signal and a signal corresponding to a set of second features of the waveform of said analog signal, and means for applying the sets of first and second waveform feature signals to said communication channel; and
said receiving means further comprises means jointly responsive to said received first waveform feature signal and the blocks of second coded sample signals for detecting erroneous second coded sample signals, and means operative upon detection of each erroneous second coded sample signal jointly responsive to the received second waveform feature signal and the second coded sample signals for modifying the value of said detected erroneous second coded sample signal to reduce errors in said analog signal replica. - View Dependent Claims (14, 16, 18, 20, 23, 27, 31, 35, 36)
- and receiving means comprising means for converting each block of differential pulse code modulation coded signals into a block of second coded sample signals, and means responsive to the blocks of second coded sample signals for generating a replica of said analog signal
- 15. said feature signal generating means comprises means responsive to each block of differential pulse coded modulation coded signals for producing a set of third coded sample signals, means responsive to the third coded sample signals of each block for forming a signal representative of a first distinct feature of the block portion of the waveform of the input analog signal, and means for combining the third coded sample signals of said block to form a signal corresponding to a second distinct feature of the waveform of the input analog signal block portion.
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21. said block dividing means comprises means for dividing the block first coded sample signals into a sequence of adjacent first coded sample signals, said means for producing a signal characteristic of each of said groups comprises means for generating a signal representative of the deviation between the adjacent first coded sample signals;
- and said means for selecting one of said characteristic signals comprises means for selecting the maximum of the deviation signals of the block.
- View Dependent Claims (25, 29, 33, 37)
- 24. said means for combining the received block second coded sample signals comprises means for forming a signal representative of the difference between the adjacent second coded sample signals and said means for comparing the combined second coded sample signals with the received block first distinct waveform feature signal comprises means responsive to said adjacent second coded sample signal difference being greater than said first distinct waveform feature signal for producing a fourth signal corresponding to the occurrence of an erroneous second coded sample signal.
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26. A method for reducing errors in a communication system comprising a transmitter including means for receiving an input signal, means for converting said input signal into blocks of coded signals, and means for applying said blocks of coded signals to a transmission medium;
- and a receiver for converting the coded blocks of signals from said transmission medium into a replica of said input signal;
said method being CHARACTERIZED IN THAT;
in the transmitter, a signal representative of a first set of features of the waveform of said input signal and a signal representative of a second set of features of the waveform of said input signal are generated responsive to said blocks of coded signals, and said first and second waveform feature signals are applied to said transmission medium;
in said receiver, corrupted received coded signals are detected responsive to said first waveform feature signal and said received blocks of coded signals; and
, jointly responsive to said second waveform feature signal and the received blocks of coded signals upon detection of a corrupted received coded signal, the value of the corrupted received coded signal is modified to reduce errors in said input signal replica. - View Dependent Claims (30, 34)
- and a receiver for converting the coded blocks of signals from said transmission medium into a replica of said input signal;
Specification