JPS6349601U

JPS6349601U -

Info

Publication number: JPS6349601U
Application number: JP14186986U
Authority: JP
Priority date: 1986-09-18
Filing date: 1986-09-18
Publication date: 1988-04-04

Description

[Brief explanation of the drawing]

第１図…本考案の基本構成の説明図、第２図…
再生ヘツド回路の等価回路の説明図、第３図…記
録ヘツド回路の等価回路の説明図、第４図…本考
案の第１の実施例の説明図、第５図…本考案の第
２の実施例の説明図、第６図…本考案の第３の実
施例の説明図。１０……再生ヘツド回路、１１……再生ヘツド
、１２……ロータリトランス、１３……再生増幅
器、１４……再生周波数特性選定手段、２０……
記録ヘツド回路、２１……記録ヘツド、２２……
ロータリトランス、２３……出力増幅器、２４…
…記録周波数特性選定手段。 Figure 1...Explanatory diagram of the basic configuration of the present invention, Figure 2...
FIG. 3: An explanatory diagram of the equivalent circuit of the reproducing head circuit. FIG. 4: An explanatory diagram of the first embodiment of the present invention. FIG. 5: An explanatory diagram of the equivalent circuit of the recording head circuit. Explanatory diagram of the embodiment, FIG. 6: An explanatory diagram of the third embodiment of the present invention. 10... Reproducing head circuit, 11... Reproducing head, 12... Rotary transformer, 13... Reproducing amplifier, 14... Reproducing frequency characteristic selection means, 20...
Recording head circuit, 21... Recording head, 22...
Rotary transformer, 23... Output amplifier, 24...
...Recording frequency characteristic selection means.

Claims

[Claims for Utility Model Registration] (1) A playback head circuit that supplies the playback output of the playback head to a playback amplifier via a rotary transformer for amplification, and supplies the recording current of the output amplifier to the write head via the rotary transformer. In a magnetic recording and reproducing circuit that is equipped with a recording head circuit that performs normal recording and reproduction and high-speed dubbing, there is a A reproduction frequency characteristic selection means for selecting the frequency characteristic of the reproduction output to a desired characteristic by switching the resonant frequency of the reproduction head circuit by using the reproduction head circuit; A magnetic recording/reproducing circuit comprising: recording frequency characteristic selection means for selecting a desired characteristic for specifying the frequency of the recording current by switching the resonance frequency of the recording head circuit in accordance with the speed during dubbing recording operation. . (2) The reproduction frequency characteristic selection means and the recording frequency characteristic selection means are characterized in that the resonant frequency is switched by changing the tap ratio of the rotary transformer in accordance with the speed during normal reproduction operation and high-speed dubbing operation. A magnetic recording/reproducing circuit according to claim 1 of the utility model registration claim. (3) The playback frequency characteristic selection means and the recording frequency characteristic selection means are each provided with a step-down transformer, and change the resonance frequency by switching to a rotary transformer or a step-down transformer for the speeds during normal playback operation and high-speed dubbing operation. The magnetic recording/reproducing circuit according to claim 1, characterized in that the magnetic recording/reproducing circuit is a switching circuit. (4) The reproduction frequency characteristic selection means and the recording frequency characteristic selection means select the resonant frequency by switching the capacitance of the capacitor connected in parallel to the rotary transformer in accordance with the speed during normal reproduction operation and high-speed dubbing operation. The magnetic recording/reproducing circuit according to claim 1, characterized in that the magnetic recording/reproducing circuit is a switching circuit.