JPH0316702B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape recorder, and more particularly to a non-recording section skip control device in a tape recorder.

Audio signals recorded on tape are not necessarily recorded continuously, but may be recorded with long blank areas, that is, unrecorded areas. When playing such a tape, in order to shorten the time from the end of playback of the first recorded section to the start of the playback operation of the next recorded section with the non-recorded section interposed, a tape fast-forward operation etc. is commanded in the non-recorded section. A non-recording section skipping control device for causing a tape recorder to skip the non-recording section is already known. However, the conventional unrecorded section skipping control device commands a fast-forward operation, etc., detects the tip of the recording section, and then instructs the play operation mode, so it has the disadvantage that there is a portion near the tip of the recording section that is not played back. are doing.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an unrecorded section skip control device that allows a tape recorder to accurately skip over unrecorded sections without causing unplayed portions near the tip of the recording section. be.

A clock pulse generator for generating clock pulses, which is a control device for skipping the unrecorded section of a tape recorder and has a function of starting each operation of queue, review, and play in response to a command to start each operation of queue, review, and play. and a waveform converting circuit that converts the audio signal obtained through the playback head into audio pulses, and counts the clock pulses while being reset by the audio pulses in the unrecorded part detection mode, while in the recorded part detection mode. A counting means for counting the audio pulses and a non-recording section detection mode are set at the same time as the play operation of the tape recorder starts, and when the count content of the counting means reaches a predetermined value, the cue operation start command is issued and the non-recording is started. The recording section detection mode is set in place of the recording section detection mode, and when the count value of the counting means reaches a predetermined value in this recording section detection mode, a review operation start command is issued and the unrecorded section detection mode is set again. and a second control circuit that cancels the review operation and issues a play operation command when the count value of the counting means reaches a predetermined value in the re-unrecorded portion detection mode.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

In FIG. 1, a recorded audio signal obtained through a playback head 1 is supplied to an amplifier 3 and an amplifier 4 via an equalizer amplifier 2. The audio signal amplified by the amplifier 3 is supplied to the speaker SP and reproduced, and the audio signal passing through the amplifier 4 is waveform-converted by the Schmitt trigger circuit 5 to become a pulsed audio signal, that is, an audio pulse signal. The amplifier 4 and the Schmitt trigger circuit 5 form a waveform conversion circuit. The audio pulse generated from the Schmitt trigger circuit 5 is supplied to one input terminal of each of the NAND gates G ₁ and G ₃ . The clock pulse of a predetermined frequency emitted from the clock generator 6 is
It is supplied to one input terminal of NAND gate _G2 .
The other input terminal of each of the gates G ₁ and G ₂ is supplied with the output of the D-type flip-flop FF ₁ , and the other input terminal of the gate G ₃ is supplied with the Q output of the D-type flip-flop FF ₁ . There is.

When the tape recorder is in play mode and the playback head 1 is in the recording section, the D-type flip-flop _FF1 is in the reset state, and the other input terminal of each of the gates _G1 and _G2 is connected to the D-type flip-flop FF1. A non-recorded portion detection command signal consisting of a high level signal is supplied from the output terminal of flip-flop _FF1 .
Therefore, the clock pulse is connected to the NAND gate G ₂ ,
The audio pulse from the Schmitt trigger circuit ₅ is supplied to the clock input terminal of the counter 7 via NAND gates G ₁ and G ₄ .
is supplied to the clear input terminal of Therefore, at this time, audio pulses are supplied one after another to the clear input terminal of the counter 7, and the count value of the counter 7 does not increase significantly, but when the playback head enters a non-recording area, no audio pulses are supplied. After the count value of the counter 7 starts to increase and reaches a first predetermined value after a predetermined time _T1 determined by the repetition frequency of the clock pulse, a high level signal is output from the output terminal _QN . As is clear from the above, the counter 7 and the gates _G1 to _G5 count clock pulses while being reset by audio pulses in response to the non-recording section detection command signal from the D-type flip-flop _FF1 . D-type flip-flop
It forms a counting means that operates in a recording section detection mode that counts audio pulses in response to a recording section detection command signal from _FF1 .

On the other hand, the high level signal from the output terminal _QN is
The signal is supplied to the preset input terminal of the flip-flop FF ₁ and the queue command terminal of the mechanism control section 8, and the tape recorder starts the queue operation. At the same time, a high-level signal is supplied from the queue output terminal of the mechanism control section 8 to the inverter I _ov , and the output of the inverter I _ov , which is supplied to the clear input terminal of the D-type flip-flop FF ₁ , becomes low level and the D-type flip-flop is FF ₁ enters the set state. Then, the output of the D-type flip-flop _FF1 becomes low level and the non-recorded section detection command signal disappears, and the Q output becomes high level and is supplied to the other input terminal of the gate _G3 as the recorded section detection command signal.

Therefore, when the playback head enters the recording section, only the audio pulses supplied from the shot trigger circuit 5 are supplied to the clock input terminal of the counter 7. Then, the count value of the counter 7 increases and reaches a second predetermined value that is larger than the first predetermined value by a predetermined number, and the output terminal Q _L corresponding to the bit lower than the bit corresponding to the output terminal Q _N
emits a high level signal. This high level signal
It is supplied to one input terminal of AND gate _G6 .
Now, since the Q output of the D-type flip-flop _FF1 , which is supplied to the other input terminal of the gate _G6 , is at a high level, the output of the gate _G6 is at a high level.
At this time, the output of gate G ₆ is on the one hand D
The flip-flop FF ₂ is set, and on the other hand one input terminal of the NAND gate G ₇ is brought to a high level. An audio pulse is supplied from the Schmitt trigger circuit 5 to the other input terminal of the gate G ₇ , and this audio pulse is supplied to the gate G ₇ ,
Clear counter 7 via G ₄ . Also, when the D-type flip-flop _FF2 is set, its Q
A high level signal is supplied from the output terminal to the review (REV) command terminal of the mechanism control section 8, and the tape recorder starts the review operation. At the same time, a high level signal is supplied from the review output terminal of the mechanism control section 8 to the clear input terminal of the D-type flip-flop _FF2 , and the cue output terminal becomes low level, causing the clear input terminal of the D-type flip-flop _FF1 to go low. The output of the inverter _Iov, which had been maintained, becomes high level, and both the D-type flip-flops _FF1 and _FF2 are reset. Then, the audio pulse and the audio pulse will be supplied to the clock input terminal and the clear input terminal of the counter 7, respectively. In this state, when the playback head enters the non-recording area, the count value of the counter 7 starts to increase, and after a predetermined time _T2 , a third value smaller than the first predetermined value is reached.
When the predetermined value is reached, the output terminal Q _M becomes high level.
At this time, since both the output of the D-type flip-flop _FF2 and the output of the inverter _Iov are at high level, the AND gate _G8 supplied with these two signals and the high level signal output from the output terminal _QM
A high level signal is then supplied to the PLAY command input terminal of the mechanism control section 8, and the tape recorder enters the play operation mode and completes the unrecorded section skipping operation.

The AND gate _G9 , which supplies an output to the clock input terminal of the D-type flip-flop _FF1 , is provided so that it can also control the playback cue operation. That is, when a playback cueing operation command is issued and the tape recorder is in a queue operation, if an unrecorded portion exists for a predetermined period of time, a high level signal is output to the output terminal _QM of the counter 7. At this time, the output of the AND gate _G9 becomes high level and serves to set the D-type flip-flop _FF1 to change the mode to detect the recording section.

The movement of the playback head relative to the recording tape when controlled by the above-described unrecorded section skip control device according to the present invention will be explained with reference to FIGS. 2 and 3. FIG. 2A is a diagram showing a part of a recording tape including a non-recorded part held in a recording section, and FIG. 2B is a diagram showing the movement of the playback head with respect to the tape shown in FIG. 2A. During playback, the playback head passes the rear end of the first recording section _R1 for a predetermined period of time.
After proceeding over the non-recording section N for T ₁ , it enters the next recording section R ₂ by the cue operation. Thereafter, after counting a predetermined number of audio pulses, the playback head returns to the recording section _R1 by a review operation, passes the rear end of the non-recording section N, and then returns to the recording section R by a play operation after a predetermined time _T2 . We are moving towards ₂ .

FIG. 3 is a diagram showing a case where the playback head reaches the end of the tape during the unrecorded section skipping operation. Figure 3A shows a forward side track that has an unrecorded area between the rear end of the first recording part and the end of the recording tape, Figure 3B shows the movement of the playback head relative to Figure 3A, and Figure 3C shows the recording that includes Figure 3A. The reverse side track having the next recording section on the tape is a diagram showing the movement of the playback head with respect to FIG. When the playback head reaches the end point _E1 while moving on the forward track by cueing, the tape recorder mode switches to the reverse side, and the unrecorded section N on the reverse track is
A jumping motion is performed. In this case, when the playback head reaches the end _E1 , the mode of the tape recorder is switched to the reverse side, the play operation mode is set, and the counter 7 is cleared.
By resetting the flip-flop FF ₁ , the playback head is set to the beginning of the reverse track E ₂ .
It is also possible to proceed from there toward the recording section _R2 by a play operation.

Although the above description has been made regarding the case where the present invention is applied to an auto-reverse type tape recorder, the present invention can also be applied to a one-way play tape recorder. However, in that case, when the playback head reaches the end of the tape, it is necessary to clear the counter 7 and reset the D-type flip-flop _FF1 .

As described in detail above, the non-recording section skip control device according to the present invention reliably detects the recording section while preventing false detection due to noise etc. by counting a predetermined number of audio pulses. Later, by the review operation, the playback head is returned to the rear end of the unrecorded area and a play operation mode command is issued, so that the unrecorded area skip operation can be performed quickly and accurately without causing any unplayed parts near the leading edge of the recording area. It can be controlled. Also,
In the unrecorded section skip control device according to the present invention, all signal processing is performed digitally, making it easy to integrate the signal into an integrated circuit.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing one embodiment of the present invention, and FIGS. 2 and 3 are diagrams showing the movement of the head by the apparatus of FIG. Explanation of symbols of main parts, 1... Playback head, 2...
Equalizer amplifier, 3, 4... Amplifier, 5... Schmitt trigger circuit, 6... Clock pulse generator, 7
... Counter, 8... Mechanism control section.

Claims (1)

[Claims] 1. A clock pulse generator for generating clock pulses, which is a control device for skipping the unrecorded section of a tape recorder, which is equipped with a function to start each operation of queue, review, and play in response to a command to start each operation of queue, review, and play. a waveform conversion circuit that converts the audio signal obtained through the playback head into audio pulses, and counts the clock pulses while being reset by the audio pulses in the non-recording section detection mode, while counting the clock pulses while being reset by the audio pulses in the recording section detection mode. includes a counting means for counting the audio pulses, and sets an unrecorded portion detection mode at the same time as the play operation of the tape recorder starts, and when the count content of the counting means reaches a predetermined value, issues the cue operation start command and also outputs the cue operation start command. The recording section detection mode is set in place of the recording section detection mode, and when the count value of the counting means reaches a predetermined value in this recording section detection mode, a review operation start command is issued and the unrecorded section detection mode is set again. 1st
A non-recording device comprising: a control means; and a second control circuit that cancels the review operation and issues a play operation command when the count value of the counting means reaches a predetermined value in the second unrecorded portion detection mode. Section skipping control device.