Adaptive transmit pre-emphasis for digital modem computed from n

Details Adaptive transmit pre-emphasis for digital modem computed from n Adaptive transmit pre-emphasis for digital modem computed from n

1989-05-25

1991-04-16

Olms, Douglas W.

Pulse or digital communications

Repeaters

Testing

375 14, H04L 700

Patent

active

050089030

ABSTRACT:
An apparatus and method calculates pre-emphasis coefficients for a transmitting modem based upon the noise spectrum as it is received at the receiving modem. A noise spectrum analysis circuit calculates a difference between the best-fit transmitted data and the actually received data. This difference is used to compute a discrete Fourier transform of the noise spectrum, which is transmitted back to the transmitting modem on the secondary channel. This data is used to calculate filter coefficients for the transmitting modem.

REFERENCES:
patent: 3593142 (1971-07-01), Freeny
patent: 4053837 (1977-10-01), Ryan et al.
patent: 4433425 (1984-02-01), de Jaeger
patent: 4483009 (1984-11-01), Honda et al.
patent: 4489416 (1984-12-01), Stuart
patent: 4550415 (1985-10-01), Debus, Jr. et al.
patent: 4797898 (1989-01-01), Martinez

Affiliated with

Also associated with

Rating

Adaptive transmit pre-emphasis for digital modem computed from n does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Adaptive transmit pre-emphasis for digital modem computed from n, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Adaptive transmit pre-emphasis for digital modem computed from n will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-426888