Noise removing device and data communication apparatus using the

Details Noise removing device and data communication apparatus using the Noise removing device and data communication apparatus using the

1994-10-20

1997-11-04

Chin, Stephen

Pulse or digital communications

Pulse code modulation

Noise or distortion reduction

375285, 375350, 455296, H04B 110, H04B 1404

Patent

active

056848307

ABSTRACT:
The noise removing device is used in a data communication system utilizing a transmitting signal modulated by a data signal to be transmitted. The noise removing device includes a receiving section for receiving the transmitting signal, and converting it into an electric signal, so as to supply an input signal, an analog signal processing circuit for selectively passing the input signal in a first frequency range including a carrier frequency of the transmitting signal, thereby removing a first noise, for converting the passed signal into a digital signal, and for outputting the digital signal, and a digital signal processing circuit for sampling the digital signal, and for selectively passing the digital signal in a second frequency range including the carrier frequency based on a result of comparison of a pattern obtained by the sampling with a predetermined pattern, thereby removing a second noise.

REFERENCES:
patent: 4679090 (1987-07-01), Erhardt
patent: 5218448 (1993-06-01), Honjo et al.
patent: 5280347 (1994-01-01), Shiraishi et al.
HPSIR, "Serial Infrared Communications Specification," Jul. 21, 1994, pp. 1-9.
HPSIR, "Serial Infrared Communications Hardware Design Guide," Jul. 21, 1994, pp. 1-7.

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