Signal processing apparatus and method wherein control signals and power signals are superimposed
First Claim
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1. A signal processing apparatus comprising:
- a static unit;
a rotary unit rotating in relation to the static unit;
a plurality of recording/reproducing heads which are disposed on the rotary unit;
a rotary transformer, via which signal reception/transmission is performed between the static unit and the rotary unit;
means for generating an electric power signal supplied to a circuit inside the rotary unit from the static unit;
means for superimposing a control signal on the electric power signal generated by the generating means;
means for generating a reference-level voltage inside the rotary unit;
means for comparing a voltage level of the superimposed electric power signal with the reference-level voltage so as to obtain a switching signal; and
means for controlling the plurality of recording/reproducing heads inside the rotary unit by use of the switching signal.
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Abstract
A compact rotary transformer is disclosed. In the structure of the rotary transformer, a timing-signal producing unit detects a control signal superimposed on an electric power signal output from a power transmission channel of the rotary transformer to produce a timing signal. A head-switching-signal generating unit uses the timing signal to generate a switching signal for performing switching between reproducing heads so that one of the reproducing heads is selected by a switch. A reproduction channel of the rotary transformer outputs a reproducing signal via the switch.
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Citations
20 Claims
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1. A signal processing apparatus comprising:
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a static unit;
a rotary unit rotating in relation to the static unit;
a plurality of recording/reproducing heads which are disposed on the rotary unit;
a rotary transformer, via which signal reception/transmission is performed between the static unit and the rotary unit;
means for generating an electric power signal supplied to a circuit inside the rotary unit from the static unit;
means for superimposing a control signal on the electric power signal generated by the generating means;
means for generating a reference-level voltage inside the rotary unit;
means for comparing a voltage level of the superimposed electric power signal with the reference-level voltage so as to obtain a switching signal; and
means for controlling the plurality of recording/reproducing heads inside the rotary unit by use of the switching signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15, 16, 17, 18, 19, 20)
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12. A signal processing method using a signal processing apparatus in which signal reception/transmission is performed between a static unit and a rotary unit rotating in relation to the static unit via a rotary transformer and in which a plurality of recording/reproducing heads are disposed on the rotary unit, the method comprising the steps of:
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generating an electric power signal supplied to a circuit inside the rotary unit from the static unit;
superimposing a control signal on the electric power signal generated by the generating step;
generating a reference-level voltage inside the rotary unit;
comparing a voltage level of the superimposed electric power signal with the reference-level voltage so as to obtain a switching signal; and
controlling the plurality of recording/reproducing heads inside the rotary unit by use of the switching signal.
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Specification