Excavating
Patent
1993-09-21
1995-10-10
Baker, Stephen M.
Excavating
H03M 1312
Patent
active
054577055
ABSTRACT:
A data transmission system for transmitting data by way of encoding modulation has a transmitter including a convolutional encoder and a receiver including a Viterbi decoder. For the case when the bit rate is changed, the data transmission system employs the same modulator/demodulator, and effectively utilizes a frequency band which is unchanged. The transmitter includes a selector for periodically switching two output signals, one having a redundant bit produced from the convolutional encoder and the other having an information bit instead of a redundant bit, resulting in a variable encoding ratio. The Viterbi decoder decodes a designated signal from the convolutional encoder. The receiver also includes a circuit for reconstructing branch metrics only when a received symbol composed of only an information bit without a redundant bit is supplied, and circuits for regenerating a information bit which is added without depending on the encoding.
REFERENCES:
patent: 4493082 (1985-01-01), Cumberton et al.
patent: 4586182 (1986-04-01), Gallager
patent: 4945549 (1990-07-01), Simon et al.
patent: 5291521 (1994-03-01), Betts et al.
patent: 5301209 (1994-04-01), Wei
Baker Stephen M.
NEC Corporation
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