Pulse or digital communications – Transmitters – Antinoise or distortion
Patent
1993-02-11
1996-01-23
Chin, Stephen
Pulse or digital communications
Transmitters
Antinoise or distortion
375229, 375350, 36472416, 36472413, H04K 102
Patent
active
054870895
ABSTRACT:
An input bit sequence is converted into n-bit parallel symbol signals each representing one symbol. A shift register stores an "m" number of the n-bit parallel symbol signals, shifting the n-bit parallel symbol signals one symbol by one symbol and outputting them. At least one selector is operative for sequentially selecting one of the k-th symbol signal and the (m+1)-k-th symbol signal outputted by the shift register in response to a clock signal, where k equals 1, 2, . . . , (m-1)/2. A sampling counter serves to count pairs of successive clock pulses of the clock signal. An Exclusive-OR circuit executes Exclusive-OR operation between the clock signal and an output signal of the sampling counter. At least one first read-only memory stores data representing portions of predetermined impulse response waveforms, and outputs the data in response to an address signal having higher and lower parts. A second read-only memory stores data representing portions of predetermined impulse response waveforms, and outputs the data in response to an address signal having higher and lower parts. A filter output signal is generated by combining the data output by the first read-only memory and the second read-only memory.
REFERENCES:
patent: 4709343 (1987-11-01), Van Cang
patent: 4755773 (1988-07-01), Ohmagari
patent: 4843581 (1989-06-01), Cupo et al.
patent: 4843615 (1989-06-01), Davis
patent: 5005184 (1991-04-01), Amano et al.
patent: 5117385 (1992-05-01), Gee
patent: 5148448 (1992-09-01), Karam et al.
patent: 5230008 (1993-07-01), Duch et al.
patent: 5285479 (1994-02-01), Iwane
Honda Shoichiro
Misaizu Kouei
Ohnishi Hiroshi
Chin Stephen
Le Amanda T.
Matsushita Electric - Industrial Co., Ltd.
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