Code converters

Communications: electrical – Audible indication – Percussion-type sound producer

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

H03K 1302

Patent

active

042097738

ABSTRACT:
A digital-to-analogue converter which uses a technique of two-level quantization in order to generate a pulse density code signal which yields the analogue signal when filtered. Standard digital logic adders and registers are used in the conversion of PCM signals to the pulse density code. The adders and registers are arranged as a feedback loop in which an approximation signal capable of either a "high" or a "low" level is compared repetitively with a PCM signal and the difference is accumulated, but at the end of each operation the accumulated total is tested and the value of the approximation signal for the next cycle is chosen so as to reduce the accumulated total. The cycle period is set by a clock, and the approximation signal is the pulse density code signal. The noise spectrum of the pulse density code signal may be adjusted by the addition of an offset signal to the incoming PCM signal. The digital-to-analogue converter is suitable for use in converting linear PCM telephone speech signals into analogue signals.

REFERENCES:
patent: 3292173 (1966-12-01), Horton
patent: 3757261 (1973-09-01), Sather
patent: 4006475 (1977-02-01), Candy
patent: 4079373 (1978-03-01), Brown
patent: 4086656 (1978-04-01), Brown
Ritchie, "IEEE Transactions on Communications," vol. Com-22, No. 11, Nov. 1974, pp. 1797-1806.
Insam, "Electronics," Dec. 20, 1973, vol. 46, p. 113.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Code converters does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Code converters, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Code converters will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1482767

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.