Transcoder
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Aug 25, 1981
Grant Date -
N/A
app pub date -
Dec 20, 1979
filing date -
Dec 20, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Samples of the amplitude of a quadrature amplitude modulated (QAM) subcarrier signal are taken at times corresponding to each axis crossing of each of the two quadrature related signal components. The polarity of alternate ones of the samples is inverted and the signal is reconstructed from the inverted and non-inverted samples whereby the phase of one of the signal components is reversed without alteration of the phase of the other. Where the QAM signal is a television chrominance signal, means are provided for periodically inhibiting inversion of the samples on alternate lines whereby PAL type chrominance signals may be converted to or from NTSC or NTSC 'like' chrominance signals.
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