JPH0125126B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a timer recording system, and more particularly to an improvement in a timer recording system for a reverse type tape recorder equipped with an automatic tuning processing circuit.

Conventionally, some high-end tape recorders are of a type that performs automatic tuning during timer recording. As is well known, this automatic tuning involves recording a predetermined signal for a certain period of time when the power is turned on using a timer, playing it back, and setting the recording bias amount etc. according to the type of tape. An automatic tuning circuit consisting of:

However, when such an automatic tuning method is applied to a conventional reverse type tape recorder, there is a risk that temporary interruptions in recording may occur. In other words, when automatic tuning with timer recording is performed in the forward direction (FWD), when the tuning is reversed to the reverse direction (REV), tuning is performed in the reverse direction, and after that, the tuning is performed in the forward direction (FWD). Even if you record in the opposite direction, the recording will immediately flip to the opposite direction, so
The recording signal will be temporarily interrupted.

SUMMARY OF THE INVENTION An object of the present invention is to avoid interruptions in the recording signal after the start of recording in the event of reversal during automatic tuning in timer recording.

In order to achieve this objective, the present invention provides that, in case of reversal during automatic tuning in timer recording,
The present invention is characterized in that after tuning is completed, the tuning signal is erased from the tuning start position on the forward direction side, and recording is started on the reverse direction side.

The present invention will be described below with reference to embodiments shown in the drawings. In FIG. 1, 1 is a tape running mechanism;
3 is an automatic tuning processing circuit; 4 is an automatic muting circuit;
5 is an arithmetic circuit, 6 is a count memory, 7 is a mutating count memory, 8 is a recording input path, 9 is a playback output path, 10 is a tuning start switch, 11 is a timer recording switch, 12 is a power-on detection circuit, IN is the recording signal input terminal, and OUT is the playback signal output terminal.

The control circuit 2 controls the recording, playback, and other operating modes of the tape running mechanism 1, and the tape running mechanism 1 generates a counter pulse P in response to tape running.

The automatic tuning processing circuit 3 sends a predetermined signal to the tape transport mechanism 1 via the recording input path 8 by turning on the switch 10 or by setting the switch 11 and detecting the turning on of the external timer power by the circuit 12. At the same time, the reproduction signal from the mechanism is received via the reproduction output path 9 to obtain the necessary tuning data.

The automatic muting circuit 4 is controlled by the control circuit 2 to mute the recording signal from the recording input path 8 to the tape transport mechanism 1.

The arithmetic circuit 5 counts the counter pulses P and stores +1 in the count memory 6 or the mutating count memory 7 in response to the signal FWD/REV corresponding to forward or reverse tape running from the control circuit 2.
Alternatively, -1 count is stored, and in response to the end signal END generated by the automatic tuning processing circuit 3 at the end of tuning, it is checked whether the contents of the count memory 6 are a positive count or a negative count, and automatic tuning processing is performed according to the result. Send 0 count instruction signal 0 to circuit 3.

Now, as shown in FIG. 2, it is assumed that power is supplied from the power supply detection circuit 12 and timer recording is performed near the terminal end on the forward direction side (timer recording switch 11 is set). .

At this time, first, the automatic tuning processing circuit 3 supplies the tape running mechanism control signal CL to the control circuit 2, and also supplies a predetermined tuning signal T to the recording input path 8. First, the automatic muting circuit 4 is operated by the control circuit 2 for a predetermined period of time (for example, about 4 seconds) to create a no-signal portion SL.
The arithmetic circuit 5 counts the counter pulse P at this time and causes the mutating count memory 7 to add one count at a time. Tuning TI is performed after this muting, but when the forward direction (FWD) is inverted from the reverse direction during tuning, the arithmetic circuit 5 uses the signal FWD/REV to store 1 in the count memory 6 when it is in the forward direction. The count is added count by count, but when the count is in the opposite direction, the count is subtracted by one count from the count memory 6.

When tuning is completed, the end signal is
In response to END, the arithmetic circuit 5 checks the contents of the count memory 6. If the count is positive, the count on the forward side is larger than the count on the backward side, and if the count is negative, the count on the backward side is larger. It can be seen that the count is larger than in the forward direction. For example, in Figure 2, if FWD>REV,
The tuning end position T ₁ is located before the tuning start position T ₀ on the opposite direction side.

On the other hand, if FWD<REW, either the tuning end position _T2 comes between the tuning start position _T0 and the mutating start position M, or the tuning end position _T3 comes in front of the mutating start position M. In this case, in order to determine this, the contents of the mutating count memory 7 are stored in the count memory 6 by the arithmetic circuit 5.
Add to the contents of and check whether the result is a positive count or a negative count.
In other words, if the count is positive, tuning ends.
T ₂ position, if negative count T ₃
This is the position of

When the tuning end position _T1 is reached, the arithmetic circuit 5 instructs the tape running mechanism 1 to run in the reverse direction (REW) by the control circuit 2 via the automatic tuning processing circuit 3 so that the count becomes 0.

Further, when the tuning end position is _T3 , a forward run (FF) is instructed so that the count becomes 0. Furthermore, when the tuning end position is _T2, it is in the above-mentioned no-signal area, so no command to run to count 0 is given.

When the above processing is completed, the arithmetic circuit 5 sends the zero count instruction signal to the automatic tuning processing circuit 3, and in response to this signal, the circuit 3 operates the automatic muting circuit 4 via the control circuit 2. The tuning signal on the forward direction side is erased, and after being reversed, the recording mode is entered.

As is clear from the above explanation, according to the present invention, even if there is a reversal during automatic tuning in timer recording, the tuning signal is automatically erased and recording is started from the opposite direction. No more signal interruptions during playback.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention;
FIG. 2 is an explanatory diagram of the operation. 1... Tape running mechanism, 2... Control circuit, 3...
...Automatic tuning processing circuit, 4...Automatic muting circuit, 5... Arithmetic circuit, 6... Count memory, 7... Muting count memory.

Claims (1)

[Claims] 1. In a timer-operable reverse type tape recorder equipped with an automatic tuning processing circuit and a mutating circuit, there is a count memory that stores the count of counter pulses in response to tape running, and a mute memory that stores the count of counter pulses during muting. If muting is performed prior to automatic tuning during timer recording, and it is reversed during this tuning, the counts in the two count memories mentioned above are checked after tuning is completed to determine the tuning end position, tuning start position, and muting start position. The tape is run in the reverse or forward direction according to this positional relationship to reach a zero count, and the tuning signal is erased from the tuning start position or the no-signal area on the forward side. , a timer recording method characterized by being provided with an arithmetic and control circuit for starting recording from the opposite direction.