Appeal No. 97-2709
Application No. 08/380,315
The disclosed invention relates to a method and apparatus
for compressing an input video signal for transmission, and to
a method and apparatus for reproducing the input video signal
from the transmitted video signal.
Claim 11 is illustrative of the claimed invention, and it
reads as follows:
11. A method of compressing an input video signal for
transmission, the method comprising the steps of:
(a) separating the input video signal into frequency
components representing horizontal and vertical components of
the input video signal using first and second filters,
respectively, wherein said first filter is a lowpass filter
for passing low band frequencies of said horizontal component,
and said second filter is a lowpass filter for passing low
band frequencies of said vertical component;
(b) decimating only the low band frequencies respectively
output by said first and second filters using first and second
decimators, respectively, wherein said first and second
decimators decimate the low band frequencies by M:1 to produce
a digital output signal representing horizontal and vertical
low band frequency components of the input video signal,
wherein M is a real number;
(c) interpolating only the digital output signal, prior
to transmission thereof, using first and second interpolators
for respectively interpolating low band frequencies making up
the digital output signal corresponding to said horizontal and
vertical components to produce an analog output signal
representing horizontal and vertical low band frequency
components of the input video signal;
(d) delaying the input video signal for a time period
corresponding to a time period required to execute steps (a)
2
Page: Previous 1 2 3 4 5 6 7 8 9 Next
Last modified: November 3, 2007