Ghost-cancelation reference signal acquisition circuitry, as for TV receiver or video recorder

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS The term "television set" is used in this specification to describe a television receiver front end with accompanying kinescope, power supply for a kinescope, deflection circuitry for a kinescope, portions of a television receiver associated with converting the composite video signal to the color signals for driving a kinescope, loudspeaker(s), stereophonic sound detector or audio ampliation circuitry.
The conventional video cassette recorder (VCR) includes a television receiver front end without those accompanying further items, which are termed a "television monitor" in this specification and the accompanying drawing.
If in a VCR and TV-set combined into a single piece of apparatus called a "combo" one desires the capability simultaneously to record a program received on one channel and to display a program received on a different channel, two TV receiver front ends have to be provided, one for the video tape machine with recording capability and one for the television receiver with image displaying capability.
The above-referenced U.
S.
patent application Ser.
No.
07/955,016 teaches that it is preferable to include respective sets of ghost-cancelation circuits after the video detectors of each of these TV receiver front ends, although one microcomputer can be used for calculating the filtering parameters for both sets of ghost-cancelation circuits.
Raster-scanning maps the two-dimensional spatial domains of successive image fields, which form a three-dimensional domain in space and time, into the one-dimensional time domain of a video signal.
Television engineers refer to filter networks that combine various sample values of the video signal by names suggestive of the results of such combining in the three-dimensional domain in space and time.
A filter network combining the sample values of the video signal which describe picture elements or "pixels" arrayed along the scan line of an image field is referred to as a "horizontal spatial filter"