Excavating
Patent
1978-10-03
1980-09-23
Atkinson, Charles E.
Excavating
371 31, 375 76, G08C 2500, G06F 1100
Patent
active
042246890
ABSTRACT:
An apparatus for smoothing transmission errors in a receiver in order to compensate for digital errors occurring in a transmitted signal. The apparatus includes a device to generate an output signal, which corresponds to the signal transmitted by the transmitter with a high degree of probability. The device includes a device in which a predetermined number of bits are detected and an evaluation is made whether each received bit exceeds or falls below a predetermined threshold value. For each bit or group of bits which is detected and falls below said threshold value, the redundancy of bits in the signal is used to determine the correct value of the detected low value bit. From this, a bit signal is generated which more closely corresponds to the value of the bit transmitted by the transmitter than to the received value.
REFERENCES:
patent: 3386079 (1968-05-01), Wiggins
patent: 3621139 (1971-11-01), Gibson
patent: 3631520 (1971-12-01), Atal
patent: 3849761 (1974-11-01), Kasahara et al.
patent: 4054863 (1977-10-01), Goodman et al.
Sundberg, Soft Decision Demodulation for PCM Encoded Speech Signals, IEEE Transactions on Communications, vol. COM 26, No. 6, Jun. 1978, pp. 854-859.
Jayant, Average and Median-Based Smoothing Techniques for Improving Digital Speech Quality, IEEE Transactions on Communications, Sep. 1976, pp. 1043-1045.
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