Excavating
Patent
1978-10-18
1981-02-17
Atkinson, Charles E.
Excavating
324212, 360 25, 371 21, G01R 3120, G06F 1100
Patent
active
042518822
ABSTRACT:
A method and apparatus for measuring the electroacoustic properties of magnetic tapes by means of recorded test signals of varying frequency and amplitude, wherein measured values of the reproduced signals which depend on the biassing current and correspond to predetermined parameters are obtained; for each of the relevant values of the biassing current the amplitude of the test signal to the recorded is varied until the predetermined value of the reproduced signal is attained, and the measured value of the reproduced signal obtained in this way is registered, an amplitude-modulated test signal is recorded and, by means of a test programming unit and upon the attainment of a parameter value which controls this programming unit, the relevant measured value of the reproduced signal to be determined is transmitted to an intermediate storage device for further evaluation and the biassing current is varied in order to determine the next value to be measured.
REFERENCES:
patent: Re24641 (1959-04-01), Reynolds
patent: 3506814 (1970-04-01), MacDonald et al.
patent: 3659195 (1972-04-01), Cardoze et al.
patent: 3686682 (1972-08-01), Behr et al.
patent: 3717846 (1973-02-01), Kanda et al.
patent: 4003084 (1977-01-01), Fletcher et al.
Atkinson Charles E.
BASF - Aktiengesellschaft
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