JPS5942679A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To select musics automatically with a comfortable auditive impression, by constituting a titled device so that reproducing sounds are faded out before the operation of the transition from the reproducing mode to the fast-forwarding or rewinding mode and eliminating the auditive shock that the started and reproduced music is broken suddenly. CONSTITUTION:When a music selecting command is inputted by an operation button 1 or the like, the command is inputted to a command device 2 which starts a music and reproduces a tape for several seconds and repeats music starting and reproducing thereafter. When the output of the command device 2 drives a tape mechanism 3 to start a music, tape reproducing is started, and reproduced sounds are outputted to an output terminal 6 through a regenerative amplifier 4 and an attenuator 5. Meanwhile, when the mechanism 3 is set to the tape reproducing state, square waves generated in proportion to the rotation number of a tape take-up reel are counted by a counter 7, and the attenuator 5 is operated when the counted value becomes a preliminarily set value. Thus, reproduced sounds from the regenerative amplifier 4 are attenuated, and the fade-out output is outputted from the output terminal 6.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention involves fast forwarding or rewinding a tape to find the beginning of a song, then playing it for a few seconds, then fast forwarding or rewinding it 99 degrees, and then playing it back for a few seconds. The present invention relates to a repeating magnetic recording/reproducing device.

Conventional structure and its problems Conventionally, one method of finding the beginning of a song on a recorded music tape is to play it for a few seconds, start fast forwarding, then rewind, find the next song, and play it again for a few seconds. This is what is being done. In this case, there is a drawback that the music that is being played before the user goes to search for the next song suddenly disappears, making it difficult to hear the music.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional drawbacks, and an object of the present invention is to provide a magnetic recording/reproducing apparatus that can fade out the sound being reproduced when searching for the next song.

Structure of the Invention The present invention detects the number of revolutions of the reel stand in the playback state during the song selection operation, counts this, and searches for the next song. The system is characterized by a structure in which the sound being played is faded out before the transition operation, and the music is searched for by the song selection command, played for a few seconds, and then the music gradually fades out and is no longer heard before fast-forwarding. Or a rewinding operation is performed,
This is a magnetic recording/reproducing device that searches for the next song and repeats the same process thereafter.

Description of examples FIG. 1 is a block diagram of one embodiment of the present invention.

When a song selection command is input using the non-switching operation button 1, etc., the following two commands are input to the command device 2, which starts the beginning of the song, plays the tape for a few seconds, and then repeats the beginning and playback of the song. Ru. When the output of the command device 2 drives the tape mechanism 3 to locate the beginning of the song, tape reproduction begins, and the reproduced sound is outputted to the output terminal 6 through the reproduction amplifier 4 and the attenuator 6. On the other hand, when the mechanism 3 enters a tape reproducing state, a rectangular wave generated in proportion to the tape winding rotation speed is counted by a counter 7, and when a preset count is reached, the attenuator 5 is operated. As a result, the reproduced sound from the reproduction amplifier 4 is attenuated, and a fade-out output is output from the output terminal 6.

Figure 2 shows the configuration of the main parts of this embodiment, and Figures 3 (a) to
(2) shows the main part waveform diagram and explains it. During a song selection command, when the tape running mechanism 3 enters the tape reproducing state, the switch 9 is turned on, the light emitting diode (LED) driving circuit 10 is activated, and the LEDs emit light. At the same time, a light detection plate 11 with holes equally spaced in conjunction with the tape winding reel stand
rotates.

Therefore, the photocoupler 12 has a moving light detection plate 11.
The light from the LED 8 reaches through the hole and is shaped into a rectangular wave, which is input to the counter 15.

Then, when counting with the preset number of pulses 1, an H level signal is output from the count 15. The output of this counter 15 is input to the base of the input transistor 9 of the attenuator 6, and the above H level signal turns on the transistor q. do. Now the collector resistance 1
6 and emitter resistor 17, a capacitor 18 inserted between the emitter and ground is charged, and the gate voltage of field effect transistor (FET) q gradually rises. Then, the gate-source voltage rises slowly in the same way, the drain-source resistance when FET Q2 is ON decreases, and FET Q2 is connected between the ground and the output terminal of the regenerative amplifier 4.
Since the drain and source are inserted, the reproduced sound output from the regenerative amplifier 4 is gently attenuated, and the output from the output terminal 6 is faded out.

After the reproduced sound fades out in this way, it enters fast-forward or rewind mode according to the first command given, and begins to locate the beginning of the next song.

At this time, the switch 9 of the LED drive circuit 10 is released, and the Schmitt trigger circuit 14 no longer outputs a rectangular wave, and the output of the counter 16 also becomes LOW within the set time. Therefore, since the input transistor Q1 is turned off, the capacitor 18 is discharged through the resistor 16, and the ON resistance of FET Q2 increases accordingly. By setting the ON resistance of 02 to return to the initial state during the cueing operation of a song in this way, the playback sound for cueing the next selected song will also be played after a certain period of playback in the same way as above. Can be used as a fade-out output.

Effects of the Invention As described above, according to the present invention, when a song is selected and the beginning of the song is being played back, the count value of the pulse output corresponding to the number of rotations of the reel stand reaches a predetermined value. For example, the playback signal can be faded out, and after it becomes almost inaudible, fast-forwarding or rewinding operations are performed to find the beginning of the next song, so the music that is being played back suddenly cuts out. It is possible to provide a magnetic recording and reproducing device that can eliminate the conventional aural distortions and enable automatic music selection with good audibility.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a magnetic recording and reproducing apparatus according to an embodiment of the present invention, FIG. 2 is a circuit diagram of the main part of this embodiment, and FIG.
A) to B) are main part waveform diagrams for explaining the operation. 2... Command device, 3... Mechanism,
4. River... Regenerative amplifier, 6... Attenuator,
7... counter, 8... light emitting diode, 1
1...Photodetection plate, 12...Photocoupler. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
figure

Claims (1)

[Claims] A command device issues a command to select a number of songs recorded on a tape in fast forward 9 or rewind mode, and the output of this command device allows fast forward, rewind, and normal playback while playing back the recorded signal on the tape. A mechanism section that operates in each mode, a signal generation section that generates a pulse signal corresponding to the number of rotations of the reel stand during playback during song selection operation, and a signal generation section that counts the pulse signal output from this signal generation section until a predetermined number is reached. It is equipped with a counter section that generates a detection output and an attenuator section that fades out the playback sound based on the detection output of this counter section. A magnetic recording/reproducing device characterized in that it is configured to be in a return mode.