Infrared echo canceling

Details Infrared echo canceling Infrared echo canceling

1996-06-27

1998-11-17

Negash, Kinfe-Michael

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359110, 359111, 370286, H04B 1000

Patent

active

058384715

ABSTRACT:
An infrared data communications system employs echo cancellation to remove echo signals of infrared transmissions received by an infrared receiver transducer. A version of the data pulse signal to be transmitted is subtractively combined with the received data pulse signal in order to remove echos of the transmitted signal from the received data pulse signal. A pulse stretcher circuit is utilized to increase the pulse width duration of the version of the data pulse signal to be combined with the received data pulse signal in order to ensure correct timing and cancellation of received echo signals over a range of echo signal propagation delay time.

REFERENCES:
patent: 5043976 (1991-08-01), Abiven et al.
patent: 5557634 (1996-09-01), Balasubramanian et al.
patent: 5596439 (1997-01-01), Dankberg et al.
Title: IBM Announces IRDA Chips for OEMS Place of Publication: First| Your Story Request Jun. 26, 1996.
Author: Michael Moeller Title: Handhelds Tout Lithium-Ion Batter, Big Displays Date: Jun. 5, 1995 Place of Publication: PC Week, v12, n22.
Author Keming W. Yeh Title: IrDA's Next Hurtle: Total Interoperability Date: Apr. 17, 1995 Place of Publication: Electronic Design, v43, n8.
Author: Bill Travis Title: Ease File Transfers with IrDA-Protocol Wireless Infrared Date: Mar. 30, 1995 Place of Publication: EDN, v40, n7.
Author: Jim Symour Title: IR: Fast, CHeap, and Soon Ubiquitous Date: Feb. 7, 1995 Place of Publication : PC Magazine, v14, n3.
Title HP and Microsoft to Develop Infrared Communications Solutions for Microsoft'Window 95 Operating System Date: Dec. 12, 1994 Place of Publication: Business Wire.

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