JPS5933650A - Automatic tuning processing system - Google Patents

Abstract

PURPOSE:To obtain proper tuning data, by restarting the tuning in the opposite direction even though the tape traveling direction is inverted during the automatic tuning. CONSTITUTION:A tuning processing circuit 3 actuates a tape driving mechanism 1 via a control circuit 2 to obtain tuning data TD. The data TD is invalidated during inversion in response to the FWD/REV signal, and at the same time the signal T showing a tuning mode is applied to an AND circuit AND1. While the signal FWD/REV is supplied to a memory M and an exclusive logical circuit EX from the circuit 2, and the output of the circuit EX is supplied to the AND1. Then the output of the AND1 is supplied to a circuit AND2 via an OR circuit OR. At the same time, an inverted signal of the signal T is supplied to the AND2 via a delay circuit DL and an inverter INV2. The output 1 of the AND2 is supplied to the circuit 2, and the automatic tuning is carried out again at the opposite side.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a tuning processing method during reversal in a reverse type tape recorder, particularly in a reverse type tape recorder equipped with an automatic tuning circuit.

Conventionally, some high paper tape recorders are of the type that performs automatic tuning.

As is well known, this automatic tuning involves recording a predetermined number of signals over a certain period of time, playing them back, and determining the tuning data to set bias values etc. according to the type of tape. A tuning circuit is used.

However, conventional tape recorders using this automatic tuning method are limited to non-reverse type tape recorders, and what is the reason for this? This may be due to the problem of tuning processing during reversal. In other words, when an automatic tuning method is adopted for a reverse type tape recorder, the 11 one direction (FWI) side to the opposite direction (10>
V) When the tape is reversed, the magnetic head temporarily leaves the tape surface, the tape transport mechanism temporarily stops, and the tape travel changes, so the tuning data obtained during this reversal is correct. However, there is a risk that incorrect tuning data may be determined.

Also, the fact that automatic tuning is started means that recording is performed immediately after that, and the fact that the tape is reversed during automatic tuning means that the tape is at the rear end on the forward side. ? Therefore, recording will be performed on the tape track in the opposite direction. If we try to use the tuning φ data obtained in the forward direction as effective even though we record in the reverse direction, the characteristics of the tape will not be utilized to its full potential.

Furthermore, if all the tuning data on the forward direction side is used as valid, it cannot be determined whether the tuning data was obtained after the reversal or before the reversal, resulting in a lack of accuracy.

The purpose of the present invention is to solve the above-mentioned problem by, in a reverse type tape recorder, when the tape is reversed during automatic tuning, the tuning obtained in the forward direction is invalidated and automatic tuning is restarted in the reverse direction. The key is to obtain appropriate tuning data.

In order to achieve this object, the present invention includes means for detecting reversal of the tape running direction during automatic tuning, and means for disabling the data of the automatic tuning processing circuit and restarting the tuning in response to the detection signal. Features.

The present invention will be explained below with reference to embodiments shown in the drawings.
In FIG. 1, reference numeral 1 indicates the tape running state of the reverse type differential recorder 474. 2 indicates the control circuit 1 for the 1) 4jQ, and 3 indicates an automatic tuning processing circuit, which are known in the art.

4 is the tape running direction reversed during automatic tuning? The detection means includes a tuning start memory M, an exclusive logic phase circuit [:X, a first AND circuit ANDI, and a first inverter INVI.

5 is an OR circuit OR as a restart means during automatic tuning.
,, second AND circuit A N J) 2, second inverter] NV2. 6th, Tuning DI] It is the first inner.

Now, as shown in FIG. 2, even if the switch 6 is turned on in the forward direction (F -Flip quickly.

From the control circuit 2, the tape is rotated in the forward or reverse direction 1゛WD.
1. The signal / corresponding to row J, ■ is taken out and given to one input of memory M and exclusive l-phase circuit EX, and the output of memory M is applied to the other input of said circuit EX. .

Therefore, at the time of the above inversion, the input and output of the memory M are different, and the output of the exclusive OR circuit becomes 0"1. This output is given to one input of the first AND circuit AN, DI.

The automatic tuning processing circuit 3 activates the tape running mechanism 1 via the control circuit 2 to obtain tuning data, but when reversing, it responds to the signal 4tay to invalidate the tuning data and also performs the tuning during tuning. Hail 1 signal @T is the 1st AND circuit AN
Applied to the other input of DI. Therefore, the first AND circuit ANDI outputs "1" at the time of inversion during automatic tuning, and the second AND circuit AND2 outputs "1" through the OR circuit 01 (,7).
to one of the inputs.

The other input of the second AND circuit AND2 is supplied with an inverted signal of the signal T via the second inverter INV2, but since this T is supplied via the delay circuit DL-7,
The output S, 17 (automatic tuning restart signal) of the first AND circuit ANDI is given to the automatic tuning processing circuit 3 through the second AND circuit AND2Y, and as shown in FIG. Perform tangent on the reverse direction (REV) side.

Note that the memory M is configured to be reset each time the signal corresponding to iLgv or l''WD is generated by the inverted signal of the signal T, which is the output of the first inverter INVI, or the automatic tuning restart signal. .

As explained above, according to the present invention, even if the tape running direction is reversed during the tuning process in a reverse type tape recorder, tuning is automatically restarted in the opposite direction, so that 1. Since c tuning data can be obtained, it is possible to make the most of the tape characteristics χ.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG. 2 is an explanatory diagram of its operation. ■... Tape running machine (I, 2... Control circuit, 3...
. . . Automatic tuning processing circuit, 4. Reversal detection means, 5. Automatic tuning restart means. Patent Applicant Akai Electric Co., Ltd. Agent Patent Attorney Eiji 1) Takesanbe

Claims (1)

[Claims] In a reverse type tape recorder equipped with an automatic tuning processing circuit, means for detecting reversal of the tape running direction during automatic tuning, and in response to the detection signal, disables the tuning data of the automatic tuning processing circuit and restarts the tuning. An automatic tuning processing method characterized by providing means.