JPS59188863A - Magnetic sound recording and reproducing device - Google Patents

Abstract

PURPOSE:To perform program searching by reducing gradually a reproduction signal through the fade-out processing just with operation of an operation switch, then driving automatically a tape at a high speed, when the end of the tape reproduction is desired. CONSTITUTION:A summing that a fade-out operation switch 10 is turned off, and a tape reproduction signal, e.g., a music signal is transmitted to a reproduction signal line. Under such conditions, the output of a no-signal detecting circuit 12 is set an L level and a motor is revolved at a speed set under a tape reproduction mode. Then the switch 10 is turned on, the conduction degree of a transistor 7 is changed gradually toward its conduction state by a time point when the time decided by the time constant of an integration circuit consisting of a capacitor 8 and a resistance 9 elapses. Then the transistor 7 conducts completely. Thus the fade-out processing is performed to the reproduction signal. Therefore, no signal is supplied to the input terminal of the circuit 12, and the output of the circuit 12 is set at H level. Then the motor 14 is driven by the motor current IH to drive the tape fast.

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, the When you sing the first part of a song and want to move on to the next song, you perform a fast-forward operation, but at the same time as this operation the playback sound suddenly cuts off, which can make the user feel uncomfortable.

Purpose of the Invention The present invention provides a system in which, when a tape is being played and you wish to end the playback, by 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. The object of the present invention is to provide a magnetic recording/playback device that allows cueing.

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 has become no signal, and the no-signal detection circuit detects that the transmission signal has become no signal. The output signal is used to rotate the tape running drive motor at high speed to run the tape at high speed.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the invention is shown in the figures. In the figure, 1 is a terminal to which a magnetic tape reproduction signal is input, 2.degree. 3.4 is an amplifier, and 6 is an output terminal to which a speaker is connected. Reference numeral 6 denotes a fade-out processing circuit, which includes a transistor 7 connected between the output terminal of the amplifier 2 and the ground, and this transistor 70.
It consists of a capacitor 8 connected between the base and ground, and a resistor 9 connected to the base. 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 no-signal detection circuit 12 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 rotates the motor 14 for driving the tape at a normal speed by the L level output of the no signal detection circuit 12, and rotates the bipedal motor 14 at high speed by the H level output of the no signal detection circuit 12. This is a control operation that allows the This motor drive circuit 13 includes a transistor 15 connected to the motor 14 and ground (1), a resistor 17 connected between the base of this transistor 15 and a power supply terminal 16,
It consists of a resistor 18 connected between the base and the output terminal of the no-signal detection circuit 12.

Note that the current of the motor 14 when the output of the two-leg no-signal detection circuit 12 is at L level is I, and the motor current when it is at H level is IH〉■, and the motor current is When it is set, it is a tape playback state, and when it is IH, it is a fast forwarding state.

The operation of the above embodiment will now be explained.

Assume now that the fade-out operation switch 1o is off as shown, and that a tape playback signal, such as a music signal, is being transmitted to the playback signal line 2.

In this case, the output of the g-column detection circuit 12 is at the L level, and the tape running drive motor 14 is driven by a motor current of 0.0000 and rotates at the motor speed of the tape printing state.

When the fade-out operation switch 1o is turned on here, 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 □, and the tape is in a fast forward state.

A case will be considered in which the apparatus of this embodiment is applied to a so-called karaoke apparatus for reproducing 8-trunk cartridges. When you are playing a tape on which up to the third verse of a song has been recorded and singing along to the playback sound, you may have finished singing up to the second verse, but in this case, if you turn on the fade-out operation switch 1o, , a fade-out is applied to the playback number M, resulting in a natural ending to the song. After this fade-out is completed, a fast-forward state is automatically entered, so if the karaoke apparatus has a sensing automatic stop function, an automatic stop operation will be performed after this fast-forward operation, and only the beginning of the song recorded on the cartridge tape can be performed.

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

Furthermore, it is needless to say that the magnetic recording and reproducing apparatus of the present invention includes a device having only the i474: raw function.

Effects of the Invention According to the magnetic recording/playback device of the present invention, during tape playback,
Just by operating the fade-out operation switch, the playback sound gradually decreases and playback is interrupted without any discomfort, and then the tape is automatically fast-forwarded, making it possible to quickly find the beginning. I can do it.

[Brief explanation of the drawing]

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... Z + raw signal input terminal, 6... Noade out processing circuit, 10... Fade out operation switch, 12... No signal detection circuit, 13... Motor drive circuit, 14 ... Tape travel drive motor.

Claims (1)

[Claims] A fade-out processing circuit is provided on the playback signal transmission line, and a no-signal detection circuit is provided on the playback signal transmission line after the fade-out processing circuit, and the output end of the no-signal detection circuit is connected to a motor drive circuit, so that when the tape is being played back, When the fade-out operation switch is operated to activate the fade-out processing circuit, the no-signal detection circuit detects that the transmission signal becomes no signal, and the detection output signal of the no-signal detection circuit is used to drive the tape. A magnetic recording and reproducing device configured to rotate a motor at high speed and run the tape at high speed.