Appeal No. 1998-0701
Application 08/263,744
The disclosed invention pertains to the field of
recording and reproducing audio and video signals. More
particularly, audio and video information is recorded along
with a record mode discrimination signal which has a
predetermined frequency and a periodicity within the signal
that is dependent upon the record mode. The recorded
discrimination signal can be detected during search mode to
control the speed of reproduction during the search mode.
Representative claim 1 is reproduced as follows:
1. In a magnetic recording and reproducing system of
the type which records an analog audio and video signal on a
recording medium at selected record mode speeds, and which
reads out recorded signals from said recording medium, said
system having also a read and write head, the improvement
comprising:
means for generating a record mode discrimination signal
having a predetermined frequency and a periodicity within the
signal that is dependent upon said record mode,
mixer means for mixing said record mode discrimination
signal with said audio and video signal and a pilot signal to
provide a mixed signal and for applying said mixed signal to
said read and write head for recording on said recording
medium,
whereby the recording of said record mode discrimination
signal along with said audio and video signal enables the
detection of the record mode for said recorded signal.
The examiner relies on the following references:
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