JPH0431401U - - Google Patents

Description

[Brief explanation of the drawing]

FIG. 1 shows a circuit block diagram according to a first embodiment of the present invention, and FIG. 2 shows an explanatory diagram of waveforms of the main parts thereof. 30...Encoder, 33...Decoder, 31
... Modulation circuit, 32 ... Demodulation circuit, 34 ... Erasing gate, 10 ... Erasing head.

Claims (1)

[Claims for Utility Model Registration] In a magnetic recording/reproducing device in which constant frequency oscillation output is transmitted to a rotating cylinder side via a rotary transformer and supplied to an erasing head and a DC voltage generation circuit, a non-scanning period of the erasing head is provided. an encoder that generates head selection information following timing information; a modulation circuit that modulates the constant frequency oscillation output supplied to the rotary transformer based on the encoder output; and a modulation circuit that modulates the constant frequency oscillation output supplied to the rotary transformer. a demodulation circuit that demodulates the output; a decoder that receives the output of the demodulation circuit and forms an erase gate pulse based on timing information; and a decoder that forms a head selection pulse based on the head selection information; Information transmission in a magnetic recording and reproducing device comprising an erase gate that supplies a constant frequency oscillation output to the erase head, and a selection switch that selectively supplies a recording signal to a standard head or a long-time head based on the head selection information. circuit.