JPH06162604A - Magnetic reproducing apparatus - Google Patents

Abstract

PURPOSE:To correctly detect a part not recorded and correctly control to search for a leading end by detecting and comparing the presence/absence of a video signal and an audio signal. CONSTITUTION:When a leading end searching button 1 is depressed, a control part 2 forwards a mechanical circuit part 3. A reproducing audio signal from a head 5 is compared with a reference level at a detecting circuit, 12 via an amplifier 6, resistances 7, 8 and an integrator 9. When the signal is not higher than the reference level, it is judged as the part not recorded, and consequently an H is inputted to an AND gate 26. A reproducing video signal from a head 21 is, via an amplifier circuit 22, supplied to a vertical synchronizing/separating circuit 23. As a result, vertical synchronizing signals are obtained every one tracing of several frames to several tens frames, which are muted in a processing circuit 27. The separated vertical synchronizing signal is fed to a counter 24 which starts counting upon receipt of a clock signal. It is judged as the part not recorded at a predetermined counted value, and an H is fed to the AND gate 26. An H is supplied to the control part 2 when both inputs are H at the gate 26, there by the mechanical circuit part 3 is controlled to a reproducing mode. The apparatus is thus completely controlled to detect the leading end. If the output of the gate is L, the forwarding is continued.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic tape for recording an audio signal of a karaoke song or the like on an audio track and reproducing a magnetic tape or the like on which a landscape and lyrics according to the content of the karaoke song is recorded on a video track. The present invention relates to a magnetic reproducing device for performing a cue control by discriminating a non-recording portion of a reproduced audio signal in a reproducing device.

[0002]

2. Description of the Related Art When a conventional magnetic tape for video karaoke is mounted on a magnetic reproducing apparatus to perform cue control, FIG.
The system control circuit 2 sets the mechanical control circuit 3 in the fast-forward mode or the rewind mode by operating the cue button of the operation unit 1 as shown in FIG. Then, the audio signal recorded on the audio track of the magnetic tape 4 is reproduced by the audio head 5 and the audio signal is amplified by the amplifier circuit 6. Furthermore, the amplitude of the audio signal is adjusted by the resistors 7 and 8 and supplied to the integrating circuit 9. The level of the audio signal integrated by the integrating circuit 9 is compared with the reference level by the discriminating circuit 10. As a result, when the integrated audio level falls below the reference level, the AND gate 12 and the mono-multi circuit 11 receive "Hi". Output a signal.

Here, when the mono-multi circuit 11 receives the "Hi" signal, it outputs the "Low" signal for a predetermined time, and after the predetermined time elapses, the "Hi" signal is sent to the AND gate circuit 1
Supply to 2. Therefore, at this time, when both the input terminals of the AND gate circuit 12 are "Hi", it is determined that the non-recording portion in which the audio signal is not recorded is supplied to the system control circuit 2.

Upon receiving the determination signal, the system control circuit 2 controls the mechanical control circuit 3 in the reproduction mode to complete the cue control. When the user wants to find the next song, he / she can operate the above-mentioned cue button again.

[0005]

Conventionally, in a magnetic tape for video karaoke, a non-recorded portion is created for a predetermined time between songs (between voice and video signals and next voice and video signals). is doing. By the way, when cueing control is performed using a magnetic tape for video karaoke such as T-120 or T-160, the tape running speed at the tape start point and the tape speed at the tape end point are the tape winding diameters. Markedly different from the change. As a result, the detection time of the non-recorded portion of the audio signal also fluctuates greatly, which may lead to malfunction. In particular, when the time setting of the mono-multi circuit 11 is shortened in consideration of high-speed running, if there is a non-recorded portion in the middle of a song, an erroneous operation such as detecting this and performing a cueing operation occurs. It was

Further, when there is a portion in which only the video signal is recorded in the non-recorded state of the audio signal, such as in the middle or at the end of the music, the erroneous operation of performing the cueing operation despite the presence of the video signal may occur. It was happening.

The present invention has been made in view of the above problems, and detects the presence / absence of a vertical synchronizing signal from a reproduced video signal and the presence / absence of an audio signal from the level of a reproduced audio signal. It is intended to provide a magnetic reproducing apparatus which discriminates a non-recorded portion from both detection results and controls cueing.

[0008]

SUMMARY OF THE INVENTION The present invention is a magnetic reproducing apparatus for reproducing an audio signal recorded on an audio track of a magnetic tape, determining a non-recorded portion of the reproduced audio signal, and performing cue control. Reproducing means for reproducing a video signal recorded on a video track of the magnetic tape; vertical synchronizing signal detecting means for detecting a vertical synchronizing signal from the reproduced video signal; and detecting a level of the audio signal, A non-recording portion discriminating means for discriminating a non-recording portion of an audio signal from a level, and a logic means for comparing the output of the vertical synchronizing signal detecting means with the output of the non-recording portion discriminating means. It is a thing.

[0009]

According to the above construction, the presence or absence of the video signal and the presence or absence of the audio signal are respectively detected and compared, so that the non-recorded portion can be accurately discriminated and the cue control can be performed without malfunction. it can.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of the present invention, and the same parts as those in FIG.

1 is different from FIG. 2 in that a video head 2 for reproducing a video signal recorded on a magnetic tape is used.
1. An amplifier circuit 22 for amplifying a reproduced video signal, a vertical synchronization signal separation circuit 23 for separating a vertical synchronization signal from the reproduced video signal, and a clock signal from a clock circuit 25 are counted and reset by the vertical synchronization signal. Counter circuit 24 and the output of the counter circuit 24 and the discrimination circuit 10
This is the addition of an AND gate 26 that logically ORs the output of

Next, the operation will be described.

A magnetic tape for video karaoke is attached to the magnetic reproducing apparatus, and the control unit 1 is used to control the beginning of the music.
When you operate the cue button of the system, the system control circuit 2
Sets the mechanical control circuit 3 in the fast-forward mode or the rewind mode, whereby the magnetic tape 4 is driven at a high speed at several times to several tens of times the normal reproduction speed. At this time, a cylinder motor (not shown) is driven to rotate the video head 21, and a predetermined tension is applied to bring the magnetic tape into contact with the cylinder. Then, the audio signal reproduced by the audio head 5 is amplified by the amplifier circuit 6, adjusted in amplitude by the resistors 7 and 8 and supplied to the integration circuit 9. The level of the voice signal integrated by the integrating circuit 9 is compared with the reference level by the discriminating circuit 12, and when the integrated voice level is lower than the reference level, it is discriminated as a non-recording portion in which no voice signal is recorded.
The “Hi” signal is input to the input terminal of the ND gate 26.

On the other hand, the video signal reproduced from the video head 21 is amplified by the amplifier circuit 22 and supplied to the vertical synchronizing signal separation circuit 23. Here, the video head 21 is
Since the magnetic tape is running at a high speed, it is reproduced across a plurality of video tracks, but a vertical synchronization signal is obtained once during a trace of several frames to several tens of frames. It should be noted that the video signal becomes a video without many phase servos and has many noise bars, and thus is muted by the video signal processing circuit 27.

Then, in the vertical synchronizing signal separation circuit 23,
The vertical synchronizing signal is separated from the reproduced video signal, and the separated vertical synchronizing signal is supplied to the reset terminal of the counter circuit 24. Therefore, the count value of the counter circuit 24 is reset and at the same time the clock signal of the clock circuit 25 is received to start counting. Here, the counter circuit 24 is set in advance with a predetermined count value in consideration of the vertical synchronization signal appearing once in several to several tens of frames. Therefore, when the count value reaches a predetermined count value, it is determined that the portion is a non-recording portion in which no video signal is recorded, and the "Hi" output is supplied to the input terminal of the AND gate 26.

Therefore, when the "Hi" signal is supplied to both input terminals of the AND gate 26, it is determined that the non-recording portion in which the audio signal and the video signal are not recorded is "Hi" in the system control circuit 2. Supply a signal. When this "Hi" signal is received, the system control circuit 2
Controls the mechanical control circuit 3 to the reproduction mode to complete the cue control. When the audio signal is not recorded and only the video signal is recorded, the input terminal of the AND gate 26 becomes “Hi” “Low”, and the output of the AND gate 26 becomes “Low” signal. The control circuit 2 continues the fast-forward mode or the rewind mode.
Further, when the video signal is not recorded and only the audio signal is recorded, the output of the AND gate 26 is also “Lo”.
Since it becomes the "w" signal, the system control circuit 2 continues the fast-forward mode or the rewind mode.

In this embodiment, the cue control of the magnetic reproducing apparatus using the video karaoke tape is explained, but the present invention is not limited to this, and it is also used for the cue control of the magnetic reproducing apparatus using the ordinary video tape. Of course you can.

[0018]

According to the present invention, the reproducing means for reproducing the video signal recorded on the video track of the magnetic tape, the vertical synchronizing signal detecting means for detecting the vertical synchronizing signal from the reproduced video signal, and the audio track. And a non-recording section discriminating means for discriminating a non-recording section of the audio signal from the level, the output of the vertical synchronizing signal detecting section and the output of the non-recording section discriminating section. Since it is composed of a logical means for comparing the above and the above, it is possible to accurately determine the non-recorded portion of the audio and video signals, and it is possible to perform the cue control with high accuracy.

Further, since the non-recorded portion is not discriminated by the time setting of the mono-multi circuit, the discrimination malfunction due to the change of the tape running speed does not occur.

[Brief description of drawings]

FIG. 1 is a cue control block diagram of a magnetic reproducing apparatus embodying the present invention.

FIG. 2 is a cue control block diagram of a conventional magnetic reproducing apparatus.

[Explanation of symbols]

 2 system control circuit 3 mechanical control circuit 10 non-recording portion discrimination circuit 21 video head 23 vertical sync signal separation circuit 24 counter circuit 25 clock circuit 26 AND gate (logical means)

Claims (1)

[Claims] 1. A magnetic reproducing apparatus which reproduces an audio signal recorded on an audio track of a magnetic tape, and discriminates a non-recorded portion of the reproduced audio signal to perform a cue control, and a video track of the magnetic tape. Reproducing means for reproducing the recorded video signal, vertical synchronizing signal detecting means for detecting a vertical synchronizing signal from the reproduced video signal, and a level of the audio signal, and a non-recording part of the audio signal from the level. And a non-recording portion discriminating means for discriminating the recording medium, and a magnetic reproducing device comprising a logical means for comparing the output of the vertical synchronizing signal detecting means with the output of the non-recording portion discriminating means.