Transmission apparatus, sending apparatus, and receiving apparat

Details Transmission apparatus, sending apparatus, and receiving apparat Transmission apparatus, sending apparatus, and receiving apparat

1996-11-18

1999-12-07

Tse, Young T.

Pulse or digital communications

Systems using alternating or pulsating current

Angle modulation

375308, 375326, 375332, 359181, 359158, H04B 1000, H04L 2118

Patent

active

05999570&

ABSTRACT:
The transmitter QPSK-modulates the audio data, generates a transmission channel clock having a frequency 5/4 times the data clock based on the audio data, and outputs the modulated signal resulted from QPSK-modulation at the timing of the transmission channel clock. The infrared emitter emits infrared-rays based on the modulated signal. Digital data is thus efficiently transmitted by way of infrared-rays with suppressed complexity of data processing for modulation and demodulation.

REFERENCES:
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patent: 5355133 (1994-10-01), Shimpuku et al.
patent: 5357284 (1994-10-01), Todd
patent: 5400023 (1995-03-01), Ino et al.
patent: 5432799 (1995-07-01), Shimpuku et al.
patent: 5438590 (1995-08-01), Tzukerman et al.
patent: 5537422 (1996-07-01), Shimpuku et al.
patent: 5546190 (1996-08-01), Hill et al.
patent: 5602669 (1997-02-01), Chaki
patent: 5646966 (1997-07-01), Chaki et al.
patent: 5745582 (1998-04-01), Shimpuku et al.

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