JPS58194111A - Tuning device in tape recorder - Google Patents

Abstract

PURPOSE:To attain a tuning device with a simple operation by constituting the titled device wherein the tuning state is kept until a cassette is ejected or a power supply is interrupted after the tuning device is started by the recording operation. CONSTITUTION:A command circuit 19 resets a holding circuit 10 with the application of the power supply of a detection signal 18 for cassette loading. The holding circuit 10 changes over switches 12, 13 to the position as shown in dotted lines with a recording operation detection signal 17. A signal of a reference oscillator 14 is recorded on a magnetic tape via a recording amplifier 2 and a head 3 and given to a control circuit 15 via a heat 7 and a reproducing amplifier 8. The control circuit 15, using said signal, sets resistors 4, 6 for the recording equalizer and bias adjustment to optimum values for the purpose of tuning. The tuning state set in this way is held with the holding circuit 10 until the cassette is ejected or the power supply is interrupted. A signal from a terminal 1 is recorded at this tuning state and its reproduced output is obtained at a terminal 9.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape recorder tuning device [related to]
For example, the recording bias current can be automatically set.

Generally, as a tuning device for a tape recorder, it is known to optimize a recording bias grinding current and a recording equalizer. Figure 1a shows the outline of this tuning device, and the signal that is always recorded is input from terminal l to VC2, which goes through recording amplifier 2 to recording head 3Vr, and then to magnetic channel. ) will be recorded. At this time, a variable resistor 4 is set as a recording equalizer, and a variable resistor 6 [L9 is set as a recording bias current from the earphone 45. A playback head 7 is connected to the head 9, and an internal signal from the head is outputted to a terminal 9 via a playback amplifier 8. IO is a holding circuit, and when the tuning operation key 11 is operated, the switches 12 and 13 are held at kM@ for a certain period of time (the time for tuning [fi]).

When switch 12 is set to the dotted line side, standard No. 11 is emitted! i! 1i
The reference signal from 14 passes through amplifier 2 and head 3'
A memory is placed on the distribution tape, which is reproduced by the head 7, passes through the amplifier 8, passes through the broken line 1ll11 of the switch 13, and reaches the control circuit 15. This 11tlJIm1 circuit determines whether the recording equalizer and recording bias are appropriate according to the reproduced signal, and if they are not inappropriate, the resistor 4.61 is automatically set to allllL, so that the optimum reproduction signal is set. I was doing everything I could to get it. On the other hand, this work Unaji 1EII
Even without adjustment, a standard recording equalizer and recording bias device is provided with a detector 16 that detects the ejection of the cassette or the interruption of the power supply.゛The command circuit 20 is operated in order to cut off the water flow, and the control circuit 20 is operated in response to the glue layer command from the circuit.
115 is the standard value predetermined by the factory and resistor 4.6
, standard recording, ζias, etc. can be performed.

As mentioned above, conventional tuning devices require the operation of dedicated operation keys in order to automatically set the balance, etc. Infinite σ), standard recording 3
The present invention eliminates the drawbacks of the prior art, and automatically sets the recording mode to the optimum value when recording. An embodiment of the present invention provides a tuning device for a tape recorder that does not require the trouble of operating a tuning operation key in advance and does not require a conventional reference mode. of! J2
The cause will be explained in detail. In FIG. 2, numbers 17 and N- in FIG. 1 are pressed by the recording operation key, and this key 7a
When the l-operation is performed, the tape recorder enters the recording state as shown in Ayachi. The configuration for entering this recording state is omitted in FIG. The upper ml key 17 is also connected to the holding circuit 10VC, and by operating this key 17, the key 11 in FIG. In the same way as when creating jR, the -C1 resistor 4.6 is set to breakthrough 1 direct VC. Reference numeral 18 is a detector (switch) that detects whether the cassette is ejected or the power supply current is turned on;
When these are detected, the command circuit 19 is activated and a command is issued to the holding circuit 15.The holding circuit 10 is reset in response to this command. In this way, even if the key 17 is operated without the holding circuit IO being reset, the holding circuit IO does not respond and the switch 12
．． 13 is not switched.

I: In the tuning device configured as described above,
By operating the key 17 for 1#1, the recording bias is automatically set to Emitsu's, and there is no need to worry about operating the special key 11 for tuning before operating the sickle. Also, since it is always tuned when recording, there is no need to turn on the conventional Issho mode.

In addition, for recording σ), it is necessary to adjust the recording J heart ear etc. in conjunction with the operation of the σ) key 17 only when the cassette is replaced (adjustment is not required for the same cassette), and for this reason, the power supply official or σ when operating key 17 after cassette ejection]
The recording bias etc. are adjusted accordingly.

It is preferable that the control circuit wlI15, the holding circuit IO, etc. described above be constructed by a so-called microcomputer.

As described above, the present invention is such that when the recording operation VC elituning device is activated and the device is machined and tuned, the cassette is ejected, or at least the power supply current is cut off. Retained.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a conventional example, and FIG. 2 is a one-block tire diagram showing an embodiment of the present invention. 4.6... hJ variable resistor 17... Recording operation key. Q

Claims (1)

[Claims] When the tuning device in the tape recorder is activated,
A tuning device for a tape recorder, characterized in that the state tuned by the device is maintained until the cassette is ejected or until the source current is disconnected.