Pulse or digital communications – Receivers – Angle modulation
Patent
1997-02-06
1999-04-13
Bocure, Tesfaldet
Pulse or digital communications
Receivers
Angle modulation
375377, H04L 2714
Patent
active
058944990
ABSTRACT:
A direct conversion receiver has: an I-low-pass filter 9 which has cut-off frequency switching device, switches over the cut-off frequency in accordance with the transmission rate, and eliminates high-frequency components from a modulated signal mixed with a first local signal; a Q-low-pass filter 10 which eliminates high-frequency components from a modulated signal mixed with the first local signal phase-shifted by 90 degrees; transmission rate detecting device 13 for detecting transmission rate information from transmission data detected by transmission data detecting device 12; and I- and Q-low-pass filter cut-off frequency controlling device 15 and 16 for generating I- and Q-control signals which control the cut-off frequency switching device, from the detected transmission rate. The cut-off frequencies of the low-pass filters are switched over in accordance with the transmission rate of reception.
REFERENCES:
patent: 4815106 (1989-03-01), Propp et al.
patent: 4972439 (1990-11-01), Kuznicki et al.
patent: 5565812 (1996-10-01), Soenen
patent: 5760641 (1998-06-01), Granger-Jones et al.
Imagawa Yasumi
Katayama Hiroshi
Mimura Masahiro
Bocure Tesfaldet
Matsushita Electric - Industrial Co., Ltd.
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