Adaptive transmit pre-emphasis for digital modem computed from noise spectrum
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Apr 16, 1991
Grant Date -
N/A
app pub date -
May 25, 1989
filing date -
May 25, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Advertisement
Advertisement
Advertisement
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully