JPS6250912B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an automatic magnetic tape editing device that erases only a certain section of a recorded magnetic tape and re-records another source in the erased section, and is particularly applicable to a dedicated magnetic tape editing device. It is an object of the present invention to provide an automatic magnetic tape editing device that can automatically erase only a certain section of a recorded magnetic tape and re-record another source in the erased section by providing a silence detection means. This is the purpose.

Generally, when editing a magnetic tape, the start and end positions of the song period to be erased on the recorded magnetic tape are checked in advance using a tape counter, and then re-recording is started, and the tape counter is This requires a very tedious operation of stopping at the end of the song to be erased while viewing the tape, and tape editing is tedious and takes a lot of time.

The present invention eliminates these drawbacks, and will be described below with reference to drawings of embodiments.

FIG. 1 shows an embodiment of the present invention. In the figure, 1 is a search head for detecting silent parts of a magnetic tape, 2 is an erasing head, and 3 is a recording/reproducing head. As shown in FIG. The search head 1,
The erase head 2 and the recording/reproducing head 3 are arranged in this order. The magnetic tape 8 housed in the tape cassette 5 is brought into contact with a capstan shaft (not shown) by a pinch roller 4 with an appropriate pressing force, thereby running at a constant speed. Return to Figure 1
is a playback amplifier, 10 is a playback equalizer, 11 is a recording amplifier, 12 and 13 are recording equalizers, 14
is a power amplifier, 15 is a speaker, 16 is a microphone, 17 is a trap circuit, 18 is a bias oscillator, 19 is a bias signal adjustment resistor, SW _1-1 ~
SW _1-5 are recording/playback switches that work together.
It constitutes a normal tape recorder. When the upper recording/reproducing switch SW _1-1 to _{SW 1-5} are respectively on the playback terminal P side, the upper recording/reproducing head 1 is used as a playback head by the recording/reproducing switch SW _1-2 . Can be switched. The playback signal from the playback head 1 is amplified by the power amplifier 14 in addition to the playback equalizer amplifier 9 (a playback equalizer 10 is connected between the input and output) via the recording/playback switch _SW1-1 . Drive the speaker 15. On the other hand, the upper recording re-switch switch SW _1-1 ~ _{SW 1-5}
are respectively on the recording terminal R side, the upper recording/reproducing head 1 is switched to be used as a recording head by the recording/reproducing switch SW _1-2 .
Then, the playback signal from the microphone 16 is added to the recording equalizer amplifier 11 (a recording equalizer 13 is connected between the input and output) via a pre-equalizer amplifier (consisting of a playback amplifier 9 and a recording equalizer 12). The signal is added to the recording head via the trap circuit 17 together with the bias signal from the bias oscillator 18, and is recorded on the magnetic tape 8. At this time, the frequency signal from the bias oscillator 18 is also applied to the erasing head 2, erasing the signal already recorded on the magnetic tape 8. The reproduction signal from the search head 1 is amplified by the search amplifier 20 and sent to the song interval detection means 21, and the detection signal from the song interval detection means 21 is sent to the automatic cue selection means 22.
to drive. When the search head 1 detects a silent part of the magnetic tape 8 in the normal high-speed playback mode, the automatic song selection means 22 is activated by the song interval detection means 22.
However, by turning on the recording switch 23, the search head 1 is driven by the detection signal from the song interval detection means 21 even in the recording mode when it detects a silent part of the magnetic tape 8. It is configured. The automatic cue selection means 22 performs on/off control of the motor and various switching controls of electric circuits.
Mode transitions are made from the high speed regeneration mode to the constant speed running mode or the stop mode, and from the constant speed running mode to the stop mode.

In such a configuration, the third song on the recorded magnetic tape 8 as shown in FIG. Describes the case where another source is re-recorded during the same period. In this case, first, in the high-speed playback mode, the automatic cue selection means 22 cues the third song. Next, switch to recording mode and at the same time press the recording switch 2.
Turn on 3 to start recording a new source. In this recording state, search head 1 is located upstream of erase head 2 in the tape running direction, so it has detected the recorded portion of the third song that was already recorded prior to this recording, and has detected the end of that recorded portion. When the 4th song arrives, a silent part with the next fourth song is detected, and the recording mode is shifted to the stop mode by this silent part detection. In the recording mode described above, the third song is erased by the erase head 2, and re-recorded by the erase head 1.

It goes without saying that, instead of shifting to the stop mode at the end of re-recording, the recording mode may be canceled, the mode may shift to the playback mode, and the next recorded portion may be played back.

As described above, according to the present invention, a dedicated search head for detecting silent portions of a magnetic tape is provided further upstream in the tape running direction than the erasing head, which is arranged upstream in the tape running direction from the recording/reproducing magnetic head. Therefore, it is possible to detect the erased section of the recorded magnetic tape in the recording mode, and not only can re-recording to a specific section of the recorded magnetic tape be automatically performed, but also it is possible to identify the recorded magnetic tape. This has the advantage of automatically erasing sections. Moreover, the automatic cue selection means, which is controlled for mode conversion by the detection signal of the inter-track detection means for detecting silent parts of the magnetic tape included in the playback signal from the search head, includes a recording switch. When the switch is turned off, it operates to cue a specific previously recorded section of the magnetic tape in the high-speed playback mode, and in the recording mode caused by turning on the recording switch after cueing, the specific prerecorded section of the magnetic tape is activated. When re-recording while erasing the recorded part, the inter-song detection means detects the next silent part after the specific recorded part and automatically cancels the recording mode. This makes it possible to more reliably erase the previously recorded portion of the recording and re-record it.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an embodiment of the automatic editing device of the present invention, FIG. 2 is a block diagram of a head arrangement in the same device, and FIG. 3 is an explanatory diagram of re-recording in the same device. 1... Search head, 2... Erase head, 3...
...Recording/playback head, 20...Search amplifier, 21
. . . song interval detection means, 22 . . . automatic cue selection means, 23 . . . recording switch.

Claims (1)

[Claims] 1. A dedicated search head is provided further upstream in the tape running direction than the erasing head, which is arranged upstream in the tape running direction from the recording/reproducing magnetic head with respect to the running direction of the magnetic tape. The automatic cue selection means includes: a song interval detection means for detecting a silent part of the magnetic tape; and an automatic cue selection means controlled for mode conversion by a detection signal from the song interval detection means. The means includes a recording switch, and when the recording switch is turned off, the recording switch is operated to cue a specific recorded section of the magnetic tape in the high-speed playback mode of the magnetic tape, and after the cueing, the recording switch is turned on. When re-recording while erasing a specific pre-recorded section of the magnetic tape in the recording mode caused by this, the search head detects the next silent section after the specific pre-recorded section and automatically cancels the recording mode. An automatic magnetic tape editing device configured to operate as desired.