JPH0334136B2 - - Google Patents

Description

[Detailed description of the invention] Industrial applications The present invention relates to a magnetic recording and reproducing device.

Conventional Structure and Problems Conventionally, when a music tape is played back using a magnetic recording/playback device using, for example, an 8-track cartridge, and a song is to be sung along with the song being played, for example, in the middle of the song, When the user wants to sing only the first part of a song and move on to the next song, the user performs a fast-forward operation, but at the same time as the user performs the fast-forward operation, the reproduced sound suddenly cuts off, giving the user a sense of discomfort.

Purpose of the Invention According to the present invention, when a tape is being played back and you want to end the playback, by simply operating a single operation switch, the playback signal is faded out and gradually becomes smaller, and then the tape is automatically run at high speed and the playback is stopped. An object of the present invention is to provide a magnetic recording/playback device capable of recording data.

Structure of the Invention The present invention provides a fade-out processing circuit on a reproduced signal transmission line, and also provides a no-signal detection circuit on the reproduced signal transmission line after the fade-out processing circuit, and connects the output end of the no-signal detection circuit to a motor drive circuit. When the fade-out operation switch is operated during tape playback to activate the fade-out processing circuit, the no-signal detection circuit detects that the transmission signal becomes no signal, and the no-signal detection circuit outputs a detection output. The tape is configured to run at high speed by rotating the tape running drive motor at high speed in response to a signal.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the invention is shown in the figures. In the figure, 1
is a terminal into which the magnetic tape playback signal is input, 2,
3 and 4 are amplifiers, and 5 is an output terminal to which a speaker is connected. 6 is a fade-out processing circuit, which is composed of a transistor 7 connected between the output terminal of the amplifier 2 and the ground, a capacitor 8 connected between the base of the transistor 7 and the ground, and a resistor 9 connected to the base. There is. The resistor 9 is connected to a DC power supply terminal 11 via a fade-out operation switch 10. The output terminal of the amplifier 3 is connected to a tape drive circuit 13 via a no-signal detection circuit 12. The above no-signal detection circuit 1
2 outputs an H level signal when the input signal level is approximately 0 or completely 0, ie, no signal, and outputs an L level signal when there is an input signal. The motor drive circuit 13 uses the L level output of the no-signal detection circuit 12 to rotate the motor 14 for driving the tape at a normal speed, and uses the H level output of the no-signal detection circuit 12 to rotate the motor 14 at high speed. It is controlled to rotate. This motor drive circuit 13 includes a transistor 1 connected between the motor 14 and ground.
5, a resistor 17 connected between the base of this transistor 15 and a power supply terminal 16, and a resistor 18 connected between the base and the output terminal of the no-signal detection circuit 12.

If the current of the motor 14 is I _L when the output of the no-signal detection circuit 12 is at L level, and I _H is the motor current when it is at H level, then I _H > I _L , and when the motor current is I _L is the tape playback state, and _IH is the fast forward state.

The operation of the above embodiment will now be explained.
Assume now that the fade-out operation switch 10 is off as shown, and that a tape playback signal, such as a music signal, is being transmitted to the playback signal line.
In this case, the output of the no-signal detection circuit 12 is at L level, and the tape drive motor 14 is driven by a motor current I _L and rotates at the motor speed of the tape playback state.

When the fade-out operation switch 10 is turned on, the transistor 7 gradually becomes conductive and its conductivity changes until the time determined by the time constant of the integrating circuit of the capacitor 8 and the resistor 9 has elapsed, and the above-mentioned time elapses. After that, it becomes completely conductive and fade-out processing is performed on the reproduced signal. Therefore, no signal enters the input terminal of the no-signal detection circuit 12, the output of the no-signal detection circuit 12 becomes H level, the motor 10 is driven with a motor current of _IH , and the tape enters a fast-forwarding state.

Let us consider a case where the apparatus of this embodiment is applied to a so-called karaoke apparatus for reproducing 8-track cartridges. When playing a tape on which up to the third verse of a song has been recorded and singing along with the playback sound, there may be times when you want to sing up to the second verse and end the song.In this case, if you turn on the fade-out operation switch 10, A fade-out is applied to the playback signal, creating a natural ending to the song. After this fade-out ends, it automatically enters a fast-forward state, so if the karaoke device has a sensing automatic stop function, the automatic stop operation will be performed after this fast-forward operation, allowing you to locate the beginning of the song recorded on the cartridge tape. .

In the above embodiment, since the no-signal detection circuit 12 is always connected to the reproduction signal line, the tape is fast forwarded if no signal is detected, regardless of the fade-out process. If this operation is to be associated only with the fade-out processing operation, for example, a switch interlocked with the fade-out operation switch 10 may be interposed between the reproduced signal line and the no-signal detection circuit 12. No-signal detection will be performed only when turned on.

It goes without saying that the magnetic recording and reproducing apparatus of the present invention includes an apparatus having only a reproducing function.

Effects of the Invention According to the magnetic recording/playback device of the present invention, during tape playback, simply by operating the fade-out operation switch, the playback sound gradually becomes smaller and the playback is interrupted without any discomfort, and then the tape is automatically fast-forwarded. Therefore, great effects such as quick cueing can be obtained.

[Brief explanation of drawings]

The drawing is a circuit diagram of a magnetic recording and reproducing device according to an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Reproduction signal input terminal, 6... Fade out processing circuit, 10... Fade out operation switch, 12... No signal detection circuit, 13... Motor drive circuit, 14... Tape running drive motor.

Claims (1)

[Claims] 1. A fade-out processing circuit is provided on the reproduced signal transmission line, and a no-signal detection circuit is provided on the reproduced signal transmission line subsequent to the fade-out processing circuit,
When the output end of the no-signal detection circuit is connected to a motor drive circuit and the fade-out operation switch is operated during tape playback to activate the fade-out processing circuit, the no-signal signal indicates that the transmission signal has become no signal. A magnetic recording and reproducing device configured to detect a signal with a detection circuit and rotate a tape drive motor at high speed using a detection output signal of the no-signal detection circuit to run the tape at high speed.