Quantization noise compensator apparatus and method

Details Quantization noise compensator apparatus and method Quantization noise compensator apparatus and method

1997-12-18

2000-10-24

Pham, Chi H.

Multiplex communications

Communication techniques for information carried in plural...

Combining or distributing information via time channels

375245, 341143, H04J 306, H04B 1406, H03M 300

Patent

active

061378097

ABSTRACT:
An improvement to a half duplex multipoint communication environment wherein a pilot tone enables a control device to maintain synchronization with a plurality of remote devices. The present invention employs a quantization noise compensator apparatus and method to supply a single bit, two level analog signal to drive a Voltage Controlled Crystal Oscillator (VCXO) in a remote device. The VCXO derives the sample rate signal for both transmit and receive devices, eliminating the requirement for a highly accurate digital to analog converter, thus reducing the cost and complexity of the system while allowing continuous synchronization between a control device and a plurality of remote devices.

REFERENCES:
patent: 5030952 (1991-07-01), Ledzius et al.
patent: 5124703 (1992-06-01), Kaneaki et al.
patent: 5424739 (1995-06-01), Norsworthy et al.
patent: 5471209 (1995-11-01), Sutterlin et al.
Aziz, Sorensen, and Der Spiegel, "An Overview of Sigma-Delta Converters How a 1-Bit ADC Achieves more than 16-Bit Resolution", IEEE Signal Processing Magazine, Jan. 1996, pp. 61-84.

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