AN3275SB
ICs for VCR
■ Reference
• Description on COMMERCIAL ADVANCE:
The COMMERCIAL ADVANCE technology is focused on detecting a black level existing between a program and
a CM in the TV broadcasting in the North America and the rental video tapes so as to let a microcomputer recognize
a CM part by its algorithm in order to skip the CM automatically. This IC is designed for a black level detection of a
video signal and for no-sound detection.
There are the following three modes in the CA technology:
1) COMMERCIAL ADVANCE mode
Once a program is recorded in this mode, its CM part is automatically identified and is skipped from the next
playback.
First it identifies the CM in recording the program, then puts a mark on the CM position on the video tape so
that the mark can be detected at the playback to erase the sound of the marked part and display a blue color on the
TV screen.
In the case that the tape not recorded in the commercial advance mode has been played back in this particular
mode, the marking will be done and the commercial will be skipped from the next playback.
2) MOVIE ADVANCE mode
The mode is used to play back the recorded rental video tape. You can automatically skip the commercials or
commercial promotions (preview) placed before a movie start and can move to a movie starting point. In this mode,
there are two modes available: one that skips all of a preview commercial and the other that stops skipping just
before a preview commercial, so that you can make a choice when you want to watch a preview commercial.
3) CA-LITE mode
In any programs recorded by either way, the VCR enters into a FORWARD SEARCH mode if a user presses
the Skip button, and when a commercial is skipped, the skipping process stops automatically. Since the end of the
commercial group is detected by software just after the last CM has passed, the VCR runs a reverse search for a
short time then returns to a normal play mode and starts a program again.
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PANASONIC [ PANASONIC ]
