SU1583972A1 - Device for magnetic recording of sound signal on compact-cassette - Google Patents

Abstract

The invention relates to the accumulation of information and may find application in the magnetic recording of an audio signal on a compact cassette. The purpose of the invention is to accelerate the process of setting the bias current during magnetic recording of the audio signal. When power is supplied from the power source 10 through the contact pair 18 of the switch 3 from the adjustable generator 7 erasable currents-magnetization, the erasable direct current is passed into the erasing magnetic head 8. When power is supplied from the power source 10 via the contact pair 13 of the switch 9 from the adjustable oscillator 7, the erase current is magnetized into the erase magnetic head 8, a high-frequency bias current is passed, the magnitude of which is tuned. In this position, the contact pair 13 of the switch 9 and its contact pair 2 record the erasing magnetic head 8 of the reference audio signal from the reference audio signal generator 12 by erasing magnetic head. In this case, the optimal value of the high-frequency bias current in the erasing magnetic head 8 is determined by the maximum indication of indicator 6. After setting the switch 3 to a position in which the adjustable generator 7 of the erase-hypothetical currents is connected to the power source 10 through the contact pair 18 a pair of 2 - to the universal magnetic head 1, the optimum high-frequency bias current passes through the latter. The ratio of this optimal high frequency bias current to the optimum high frequency bias current in the erase magnetic head 8 is determined by the designs of the universal and erase magnetic heads 1 and 8 for each type of magnetic tape. 1 il.

Description

The invention relates to the accumulation of information, namely, devices for magnetic recording of an audio signal on a compact cassette.

The purpose of the invention is to accelerate the process of setting the bias current during magnetic recording of an audio signal on a compact cassette.

The drawing shows one of the possible variants of the proposed device for magnetic recording of an audio signal on a compact cassette.

The device contains a universal magnetic head 1 connected by a output to a moving contact of the contact group 2 of the first switch 3, the first fixed contact of which is connected to the output of the universal amplifier 4 connected to the input of the terminal amplifier 5, to the input of the indicator 6 and to the first output of the adjustable erasure generator 7 - magnetization, erasing the magnetic head 8, the second switch 9, the power supply 10, the filter plug 11 and the audio reference generator 12. Adjustable generator 7 currents of erasure - magnetization - connected by a second output to the output of an erasable magnetic head 8 and connected by the first power bus through the first contact pair 13 of the second switch 9 to the output of the power source 10. In this case, the universal magnetic head 1 and the erasable magnetic head 8 are mounted so as to mate with a movable magnetic tape 14 placed in a compact cassette (not shown). The second fixed contact of the contact group 2 of the first switch 3 is connected via the first contact pair 15 of the first switch 3 to the input of the universal amplifier 4. In this case, the first contact pair 15 can be included in the contact group in which the second fixed contact is connected to the output of the imaging unit 16, for example, microphone The output of the generator 12 of the reference audio signal is connected to the input of the filter plug 11, the output of which is connected through the second contact pair 17 of the second switch 9 to the output of an erasable magnetic head 8. The output is0

supply point 10 is connected through the second

a contact pair 18 of the first switch 3 with the second power supply bus of an adjustable generator 7 erase currents - magnetization. At the same time, the output of the final amplifier 5 can be connected directly to the headphone 19, and through the third switch 20 to the loudspeaker 21. The magnetic recording of the sound signal to the compact cassette by means of the proposed device proceeds as follows. When power is supplied from the output of the power supply 10 to the second power supply bus of the regulated generator 7 of the erase-bias current from its second output, the erasable magnetic current passes through the erasing magnetic head 8. When power is supplied from the output of the power supply 10 to the first power supply bus of the adjustable oscillator 7, the erase current is magnetized from its second output to the erase magnetic head 8, a high-frequency bias current flows, the value of which is tuned. When the first and second switches 3 and E are shown in the drawing, the erasing magnetic head 8 passes the high-frequency biasing current from the second output of the adjustable oscillator 7 erasable currents –pod0 magnetization and the reference sound signal coming from the generator 12 of the reference audio signal plug 11. When the magnetic tape 14 is moved, the erasing magnetic head 8 records a reference sound signal on it which is reproduced by the reproducing magnetic head 1. The reproduction result It comes from the reproducing magnetic head 1 through the contact group 2 and the first contact pair 15 of the first switch 3 and the universal amplifier 4 to the terminal amplifier 5, as well as to the indicator 6. The high-frequency bias current in the erasing magnetic is changed by means of an adjustable generator 7 of erase current-magnetization head 8 to reach

5 of its optimum value, at which the reference sound signal reproduced by the universal magnetic head is maximum. The maximum reference sound signal is determined by indicator 6.

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After determining the optimal high-frequency bias current in the erasing magnetic head 8, the first and second switches 3 and 9 are shifted to the position in which the first and second contact pairs 13 and 17 of the second switch 9 and the first contact pair 15 of the first switch 3 are open, the second contact pair 18 the first switch 3 is closed, and the universal magnetic head 1 is connected by its pin to the first output of the adjustable oscillator 7 of the erase-bias current. At the same time, an optimal high-frequency magnetization current flows through the universal magnetic head 1, the value of which is set by the adjustable oscillator 7 of the erase currents-magnetization in accordance with the optimal high-frequency biasing current through the erasing magnetic head. The ratio of high-frequency bias currents is determined only by the design of universal and erasable magnetic heads 1 and 8 and permanently for the same type of magnetic tapes.

Claims (1)

Invention Formula A device for magnetic recording of an audio signal on a compact cassette containing a universal magnetic head connected by a output to a moving contact of a contact group of the first switch, the first fixed contact of which is connected to the output of a universal amplifier connected to the input of the indicator and to the first output of an adjustable erase current generator-sub magnetization connected by a second output to an erase magnetic head and connected 0 by the first power bus through the first contact pair of the second switch to the power supply output, filter plug and reference sound generator, characterized in that, in order to accelerate the process of setting the bias current during magnetic recording of the sound signal, the second fixed contact of the contact group of the first switch is connected through the first contact pair of the first switch with the input of the universal amplifier, the output The Q audio reference generator is connected to the filter plug inlet, the output of which is connected via a second contact pair of the second switch with an erase magnetic head, and the output of the power supply is connected via a second contact pair of the first switch to the second power bus of the adjustable erase current generator-magnetization. five five