JPS6338427Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is to reverse the tape near the end of the tape in a tape deck capable of automatic reciprocating recording and playback, and to reverse the tape near the end of the tape between songs (no-signal portions) or non-sound portions (no-signal portions). ) and is capable of automatically reversing the tape between songs or during silent parts.

Conventionally, as an auto-reverse method for tape recorders, there is a method in which a sensing foil is pasted at the end of the tape or at the reversal position to detect continuity and stop or automatically reverse the tape. Since the cassette tape method requires a post, the exposed area of the tape is small, making it unreasonable in terms of space. Furthermore, cassette tapes have the disadvantage that because the tape is thin, the tape tends to curl, which adversely affects the performance of recording and playback, and the tape width is also narrow, making it difficult to attach sensing foil to the tape. Furthermore, in the tape end detection method, since there is a certain length of leader tape at both ends of the tape, there is a drawback that recording or playback is not possible while this portion is moving back and forth.

The present invention was made to eliminate the above-mentioned drawbacks of the conventional method, and it is necessary to reverse the tape near the end of the tape, and when recording music during an FM broadcast while you are away, it is expected that the desired music will occur exactly at the time when the tape is reversed. When recording a song, the tape was reversed during the silent portions (between songs) to prevent parts of the song from being recorded and to completely record the entire song. Hereinafter, the present invention will be explained in detail based on embodiments and with reference to the drawings.

In the drawing, tape 3 is on supply side reel 1
From there, a capstan (not shown) for forward and backward directions is attached to the take-up side reel 2 in contact with the head 4.
It is configured to travel in the forward and backward directions by means of pinch rollers (not shown). The tape remaining amount measurement block 5 and tape end detection block 10 receive signals from a remaining amount signal generator (not shown) provided on the supply reel stand.

Regarding the remaining amount signal generator, for example, a magnet with alternately magnetized N and S poles is installed at the bottom of the reel rotation shaft, and a reed switch or the like is used to generate a kind of pulse signal as the reel base rotates. There is a method of detecting the amount of change in the wound tape by the number of pulses generated by reel rotation per unit time.

The tape remaining amount measurement block 5 is set to switch from a low level L to a high level H when a signal indicating the remaining amount time from the remaining amount signal generator becomes less than a predetermined time (for example, 3 minutes). ing. Similarly, the tape end detection block 10 is set to a low level L when a signal indicating the remaining amount time from the remaining amount signal generator reaches a predetermined amount of time (for example, 1 minute) or less.
It is set to switch from high level H to high level H.

The switching switches SW1 and SW2 in the drawing are linked to a playback/recording switching switch (not shown), and are in the playback position in the drawing. head 4
The playback output is input to the playback amplifier 6 via the changeover switch SW1, where it is amplified and becomes the playback output of the tape recorder.At the same time, the playback output is input into the no-signal time measuring block 8 through the changeover switch SW2. There is. The no-signal time measurement block 8 outputs a low level L when a playback signal such as normal music is input, but when a no-signal portion such as between songs on a playback tape is played back and input. , a high level H is output when the no-signal time is longer than a preset time (for example, 3 to 5 seconds) in the no-signal time measuring block 8. Furthermore, during recording, since the changeover switches 7W1 and SW2 are in the recording position, external signals (music signals to be recorded, etc.) are sent through the recording amplifier 7 and then to the head via the changeover switch SW1. 4, the tape 3 is recorded, and the input signal is input to the no-signal time measuring block 8 via the changeover switch SW2 before the recording amplifier 7. During recording, the output of the no-signal time measuring block 8 is similar to the above-mentioned playback, and when a normal music signal is input, it outputs a low level L. 5 seconds), a high level H is output if the no-signal time is long.

On the other hand, the outputs of the tape remaining amount measuring block 5 and the no-signal time measuring block 8 are connected to the input terminal of the AND circuit 9, respectively, and the output of the AND circuit 9 is used as a tape running direction reversal signal to control the tape running direction reversing mechanism ( (not shown).

Next, the operation of the auto-reverse detection device of the present invention constructed as above will be explained.

For example, when recording an FM broadcast while you are away, you set the radio and tape recorder to the broadcast time using a timer, and when the broadcast time arrives, the tape recorder starts recording. In this case, the changeover switches SW1 and SW2 shown in the drawing are each set to the recording position. The input signal IP passes through the recording amplifier 7 and is recorded onto the tape 3 by the head 4 via the changeover switch SW1. At the same time, the input signal IP is also input to the no-signal time measurement block 8 via the changeover switch SW2, and the output of the no-signal time measurement block 8 indicates that the no-voice state (no-signal state) of the input broadcast signal is 3 to 3. If it does not continue for 5 seconds, the level is low, and if the silent state continues for 3 to 5 seconds, it becomes high level H.

On the other hand, the signal from the remaining amount signal generator attached to the supply side reel 1 is sent to the tape remaining amount measurement block 5.
is input to the tape end detection block 10. The output signals of the tape remaining amount measurement block 5 and the tape end detection block 10 are naturally at a low level L since the tape recorder is in the early stages of operation.

Also, the AND circuit 9 is connected to the tape remaining amount measurement block 5.
Since the input signal from the no-signal time measuring block 8 is held at a low level L, it is at a low level regardless of the input signal from the no-signal time measuring block 8, and the tape recorder continues recording without outputting a tape running direction reversal signal. When the end of the cassette tape being used approaches and the remaining amount of tape reaches the equivalent of 3 minutes or less, the output signal of remaining amount measuring block 5 changes from low level L to high level H, and the AND circuit is activated. Input high level H to 9. When the input signal from the tape remaining amount measuring block 5 of the AND circuit 9 becomes high level H, the sound of the broadcast signal IP being recorded is interrupted for 3 to 5 seconds, and the no-signal time measuring block 8 detects the high level. Since the level H is output, each input signal of the AND circuit 9 becomes a high level H, so that the output signal also outputs a high level H tape running direction inversion signal. Then, the tape running direction reversal signal operates the running direction reversing mechanism, and the tape recorder automatically reverses the tape running direction, causing the tape to run in reverse, so that recording of the second track is started and recording of the next song can be stopped. It can be done without. To summarize the above, if the sound of the signal being recorded stops for 3 to 5 seconds near the end of the tape, the tape is automatically reversed.

Next, if the remaining tape capacity is, for example, 3 minutes or less and the audio of the signal being recorded does not stop for 3 to 5 seconds (no signal state), the tape end detection block 10 should be set in advance. When the time (for example, 1 minute) is reached, a high level H is output as a tape running direction reversal signal to reverse the tape near the end.

For playback, select switch SW1, SW2
is switched to the reproduction side, and the signal from the head 4 is amplified by the reproduction amplifier 6 and input to the no-signal time measuring block 8, and the same operation as in the case of recording is performed. Therefore, in the case of playback, a song recorded as described above can be played back without interruption in the middle. In the case of reproduction, the no-signal time measuring block 8 outputs a high level H when it detects a no-signal portion (between songs) of 3 to 5 seconds.

As described above, according to the present invention, it is possible to detect a no-signal part (a silent part or between songs) near the end of a tape and reverse the tape for recording.
When recording music while you are away for broadcasting, etc., you can record the entire song completely without having to interrupt it in the middle. Therefore, it is ideal for use in conjunction with a timer to record when you are away. Further, there is no need to attach sensing foil or the like to the tape, and it is suitable for use in a cassette tape deck from above the space. Furthermore, according to the present invention, since the reproduced signal is inputted to the no-signal time measuring block 8 during playback, the no-signal time measuring block 8 can be used as a means for detecting the time between songs in the song selection operation. There is no need to provide a separate detection means.

[Brief explanation of the drawing]

The accompanying drawings are block circuit diagrams of the present invention. 1... Supply side reel, 3... Tape, 4...
...recording/playback head, 5...tape remaining amount measuring block, 8...no signal time measuring block, 9...AND circuit, 10...tape end detection block.

Claims (1)

[Scope of claim for utility model registration] (1) A tape remaining amount measuring block that is output when the remaining tape time in the recordable portion near the end of the tape and before reaching the end of the tape becomes less than a predetermined time. A no-signal time measuring block is installed in parallel with the block that inputs a playback signal or a recording signal through a switching means and outputs the signal when there is no signal for a certain period of time. An auto-reverse detection device comprising a circuit for outputting a tape running direction reversal signal based on the AND of the output signals of a quantity measuring block and a no-signal time measuring block. (2) The auto-reverse detection device according to claim 1, wherein the predetermined time of the remaining tape amount measuring block is variable.