G - Physics – 11 – B
Patent
G - Physics
11
B
352/20.7
G11B 5/008 (2006.01) G11B 5/03 (2006.01)
Patent
CA 1113603
ABSTRACT OF THE DISCLOSURE The invention provides a method of automatically esta- blishing the proper adjustment of biasing current for recording sound with a three-head type tape-recorder which is equipped with a separate recorder head, reproducer head and eraser head, so that sound which is recorded by the recorder head on a running magnetic tape may be immediately reproduced by the reproducer head immediately downstream of the recorder head, the method com- prising the steps of: generating a composite calibration signal by mixing a lower frequency signal and a higher frequency signal, having sound level identical with each other, recording the com- posite calibration signal while chronologically consecutively altering the intensity of biasing current for the recording, immediately reproducing the recorded composite calibration signal on the running tape, filtering off the reproduced composite cali- bration signal to obtain the component lower and higher frequency signal outputs, comparing output sound levels of the filtered lower and higher frequency signals with each other, and stopping any further altering the recording bias current intensity upon finding, as a result of the comparison, that the output sound levels of the filtered lower and higher frequency signals have become substantially identical with each other or that the output sound level difference has just been substantially reversed, namely that the output sound level of the one component signal, initially having lower output sound level than the other, has just become substantially higher than that of the other. Thus, optimum adjustment of biasing current for recording is achieved to obtain sound reproduction frequency characteristics with the widest flat range, automatically, accurately and rapidly, after manually only setting the tape-recorder in the recording mode.
328580
Marks & Clerk
Onkyo Kabushiki Kaisha
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