JPS5938909A - Automatic tuning processing system - Google Patents

Abstract

PURPOSE:To prevent undesired erasion of recorded signals or uneration of a test signal, by providing a means to decide the duration of automatic tuning processing at forward and reverse sides respectively. CONSTITUTION:When the automatic tuning processing is over, an automatic tuning circuit 3 supplies a test end signal to a counter arithmetic circuit 4. The circuit 4 decides that the length of the FWD side is larger than the REV side at the time of plus counting of test contents and vice versa at the time of minus counting of test contents respectively. In accordance with this decision of the circuit 4, a mechanism control circuit 2 controls a sound recording/reproducing mechanism 1 to have an REW operation and an FF operation when the FWD side length is larger than the REV side length and vice versa respectively. Thus the contents of the memory 5 are set at zero. In such a way, a tape can be sent back accurately to the automatic tuning start position. Thus, the undesired erasion of recorded signals or unerasion of a test signal is prevented.

Description

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

Conventionally, some high-end tape recorders are of the type that performs one automatic tuning process during timer recording. This automatic tuning process uses a timer to send a predetermined signal for a certain period of time when the power is turned on. After recording and reproducing the tape, a bias value corresponding to the type of tape is set. For this purpose, an automatic tuning circuit consisting of a microcomputer or the like is used.

In other words, the automatic tuning process is a test method in which signal data is recorded on the tape prior to the actual recording operation and then played back.After the test is completed, the tape returns to the position where the tuning data recording started and the tuning data is recorded based on that tuning data. The original recording operation is performed.

When performing automatic tuning processing in a reverse type tape recorder, if the automatic tuning processing is started from position P1 on the forward side of the tape T as shown in FIG. When the tape is reversed to the reverse side ith;v, the automatic tuning process continues and ends at position P2 on the reverse side REV. When the automatic Turing ripening is completed, the tape moves in fast forward motion (F' F) and returns from the end position P2 to the upper nth reversal position, and then rewinds from this reversal position () (, b; w ) is returned to the automatic tuning detart position.

All of the above series of tape movement operations are measured by a counter and displayed as numerical values on the tape counter, but the count deviation may occur especially when reversing from the reverse side to the forward side as described above. This is likely to occur. For example, if you use I・' i- to count the amps and l(, EWK to count down?), H
, 13W- + FFv is specified, it takes time to switch the operation of the mechanism, so even though FF 7a- is specified, the operation of the mechanism remains EW, so there is a count error here. come to arise.

This makes it difficult to accurately return to the automatic tuning start position, and when recording with a timer, the previous recording signal is not correct. It has the drawback of unnecessarily erasing data or leaving test signals (tuning data) unerased.

The present invention has been made in response to the above problems, and is a reverse type tape recorder configured so that when the reverse side pressure is reversed during automatic tuning processing on the forward side, automatic tuning processing continues to be performed. A means for determining the length of the automatic tuning process on the tape on each reverse side, and a means for determining the length of the automatic tuning process on the tape on the forward side (when the length of the automatic tuning process is on the reverse side, the automatic tuning start position on the tape forward side is determined by a fast forward operation) and means for returning the tape to a reverse side position that coincides with the automatic tuning start position on the forward side by a rewinding operation when forward side>reverse (when 1+11), The object of the present invention is to provide an automatic tuning processing method that eliminates the drawbacks of the conventional method by instructing forward recording or forward pause at the automatic tuning start position. Examples of the invention will be described.

FIG. 2 is a block diagram showing an automatic tuning processing system according to an embodiment of the present invention, where l is a recording/playback mechanism of a tape recorder, 2 is a mechanism control circuit, 3 is an automatic tuning circuit, 4 is a counter calculation circuit, and 5 is a counter. It is memory.

In the above configuration, the operation of the recording/playback mechanism 1 is controlled by the mechanism control circuit 2, and when the operation starts, a counter pulse is generated and its change (product r
1-6) is input to the counter calculation circuit 4.

Furthermore, since the mechanism control circuit 2 controls the three automatic tuning circuits to operate, the recording/reproduction mechanism 1 operates together with the automatic tuning circuit 3.

Forward (1i
'WD)/reverse (REV) signals are output and applied to the automatic tuning circuit 3 and the counter calculation circuit 4. When the FWD signal is output, the counter calculation circuit 4 operates to increment the count memory 5 by +1 according to the change in the counter pulse from the recording/playback mechanism 1, and also increments the count memory 5 by 1 (+1) when the EV times signal is output. When the counter pulse is connected, the count memory 5 is incremented by 1 in accordance with the connection of the counter pulse.

When the automatic tuning process is completed, a test end signal is applied from the automatic tuning circuit 3 to the counter calculation circuit 4, and in response to this, the counter performance circuit 4 checks whether the contents of the count memory 5 are a positive count or a negative count. If the result is a positive count, the length of the automatic tuning process on the tape is on the FWD side>■
(, it is determined that it is on the Ev side, and when the count is negative, l
'WD side <1 (it is determined that it is the BY side).

According to these, the mechanism control circuit 2 controls the operation of the recording/playback mechanism 1, and in the former case, performs the LEW operation (in the case of the former), and in the latter case, performs the FF operation 2, thereby changing the contents of the count memory 5 (θ). Take it to the count.

Figures 3 and 4 were obtained by the above method.
1. - This shows the tape, and in Figure 3 the length of the automatic tuning process on the tape is on the FWD side! +, E
V L (if 1-Q exists, m 4 Figure H F W D I
IIQ (Indicate if it is on the RE V side.

In the case of Fig. 3, I
Return to the reverse side position P which coincides with the turning start position P1, and in the case of Fig. 4, F Ii'
By performing this operation, the automatic tuner/gestart position P1 is returned to the reverse side position P'1, which coincides with the automatic tuner/gestart position P1.

These positions P'l are the positions where the contents of the count memory ~5 become zero.

The length to return the tape is WD side) It EV side Ha joint (FWDliil) length'#L1-H, EV
fJj4ノ8sLl), and the FWD side (lt E
In the case of the V side (1 is also the length of the EV side Ll - 1i" W l
) 11111 length Ll).

If the PI returns to the above position, the forward recording (FWDH, EC) is issued when the timer is recorded, and the forward recording (FWDH, EC) is issued in other cases. This makes it possible to accurately return to the automatic tuning start position.

As is clear from the above, according to the present invention, in a reverse type tape recorder configured such that the forward side reverses to the reverse side during automatic tuning processing and the automatic tuning processing continues for a fixed period of time, the forward side and reverse A first means of determining the length of the automatic tuning process on the tape in each of the six sides, and when the length of the automatic tuning process is on the forward side or reverse side, automatic tuning is started on the forward side of the tape by a fast forward operation. ^-. 1. Since the configuration is such that forward recording or forward recording is instructed at the automatic tuning start position, it is possible to prevent count deviations to a minimum, thereby making it possible to accurately return to the automatic tuning start position.

Therefore, the previous recorded signal was unnecessarily erased.
It is possible to prevent defects such as leaving the test signal turned off. Further, according to the present invention, the operation of mechanism a can be kept to a minimum, and the automatic tuning processing time can also be shortened.

[Brief explanation of drawings]

1, 3, and 4 are schematic diagrams showing the tapes obtained by the conventional method and the 8J4 according to the present invention, and FIG. 2 is a block diagram showing the 111!4-line tape according to the present invention. l゛°° recording and playback mechanism, 2...mechanism control circuit, 3...automatic tuning low, 4...counter calculation circuit, 5...count memory. Figure 1

Claims (1)

[Claims] In a reverse-type tape recorder configured to perform automatic tuning processing continuously when reversed to the reverse side during automatic tuning processing on the forward side, the length of automatic tuning processing on the tape on each of the forward side and reverse side is A means for determining the quality,
When the length of the above automatic tuning process is on the forward side (or reverse side), the tape is returned to the reverse side position that matches the automatic tuning start position on the forward side by a fast forward operation, and when the length of the automatic tuning process is on the forward side or reverse side, it is rewinded. and a means for returning the tape to a reverse side position that coincides with the automatic tuning start position on the forward side by operation, and configured to instruct χ forward recording or forward pause at the automatic tuning start position. automatic tuning processing method.