Appeal No. 96-0122
Application No. 08/096,581
intervening claims (Answer, page 1). Accordingly, claims 1, 2
and 5 remain before us on appeal.
The disclosed invention relates to a method and a device for
determining a residual playing time and an available total
playing time of a magnetic tape on a supply reel and a take-up
reel in a magnetic-tape cassette.
Claim 1 is illustrative of the claimed invention, and it
reads as follows:
1. A method of determining the playing time of a magnetic
tape on a supply reel and a take-up reel in a magnetic-tape
cassette, said method comprising the steps:
briefly winding the magnetic tape from the supply reel to
the take-up reel;
generating and counting first winding pulses (i , i )1 2
relating to the amount of rotation of said supply reel and said
take-up reel during said step of briefly winding the magnetic
tape;
subsequently extracting the magnetic tape accommodated in
the magnetic-tape cassette over a given length (L );
H
generating and counting second winding pulses (j , j )1 2
relating to the amount of rotation of said supply reel and said
take-up reel during said step of extracting the magnetic tape;
and
calculating a residual playing time (T ) of the magnetic
R
tape left in the magnetic-tape cassette on the basis of values
determined for the counted first and second winding pulses (i ,
1
i , j , j ,) and on the basis of given values relating to the2 1 2
thickness (d) and speed (v) of the magnetic tape, to the hub
2
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