JPS62184683A - Magnetic tape reproducing device - Google Patents

Abstract

PURPOSE:To eliminate the need for a troublesome operation by setting it in advance that at some number of order of sonds the playing is to be finished, fading out an accompanyment signal after the reproduction, fast-feeding the tape, applying program search to the tape and stopping the tape. CONSTITUTION:When a switch 17 is turned on once to store '1' in a counter 15 and a reproducing switch 29 is turned on, then an output of a FF 23 goes to an H level and a motor 27 is driven. The the accompanyment signal and the sound signal recorded on the tape 1 are given to reproducing element sections 2, 3 and a sound volume 9, and a reproducing sound is given from a speaker 11. When one recording is finished, a sound presence detection circuit 13 detects an interblock, a counter 14 generates a pulse and a counter discrimination circuit 18 outputs an H level. An output of a fadeout circuit 20 goes gradually to H level, the accompanyment signal is attenuated gradually, a delay inverting circuit 22 outputs an L level after a specific time elapses an output of a FF 28 goes to an H level, the motor 27 is fed fast, a sensing pole 25 is short-circuited by a sensing tape on the tape, the FF 23 is inverted and the motor 27 is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a magnetic tape reproducing apparatus capable of reproducing audio multiplexed tapes.

Conventional technology A conventional audio multiplex tape playback device is shown in FIG.

As shown in FIG. 3, one track (hereinafter referred to as an audio track) of the audio signal recording section of the audio multiplex tape 1 is reproduced by the first reproducing element section 3 of the magnetic head, and the track of the accompaniment signal recording section is reproduced. (hereinafter referred to as an accompaniment track) is reproduced by the second reproduction element section 2, and the respective output signals are mixed via equalizer amplifiers 4, 6 and a dual volume 9, and then transmitted to a speaker 10 via a power amplifier 10. It was configured so that it would be output in the correct way. Regarding the circuit that controls the mechanism (not shown), the first flip-flop 23 controls whether the motor 27 is driven or stopped.
The motor 27 is driven by the output transistor 26 of the first flip-flop. 1st
The output of the flip-flop is normally at “L” level,
By turning on the playback switch 29 or the fast forward switch 30, the first flip 70 knob 23 is reversed and the output becomes H.
" level, and the motor 27 is driven. Next, when the tape reaches the end and the sensing ball 25 is short-circuited by the sensing tape attached to the tape, the first flip-flop 23 is reversed, and motor 2 stops. 28 is a second flip-flop, which switches between the playback state and the fast-forward state.
First, normally, it is in a reproduction state, and the output of the second flip-flop is at the "L" level. Next, when the fast forward system switch 30 is turned on, the second 7 lip-flop 2
8 is inverted, its output becomes "H" level, the second transistor 34 is switched on, the governor circuit (not shown) in the motor 27 is short-circuited, and the motor speed is increased to enter a fast forward state.

Problems to be Solved by the Invention However, when the conventional device is used as a karaoke machine at a banquet, for example, and many people take turns playing back an 8-track karaoke audio multiplexed tape and singing, the song cannot be played due to time constraints. There are times when only the first verse is to be sung, and when the first verse of the song is over, the host or facilitator performs a fast-forward operation in order to sing the next song, stops the tape by detecting the sensing tape, and then inserts the tape into the cartridge. It's very unpleasant to turn off the sound, or to fast-forward suddenly while the first verse ends and the accompaniment is playing, so you have to perform extremely troublesome operations such as gradually turning down the volume and then fast-forwarding. It had the following drawback.

Means for Solving the Problems In order to solve the above problems, the magnetic/tape playback device of the present invention uses an audio signal detection circuit to detect the presence or absence of an audio signal recorded on an audio multiplex tape, and If there is no signal for a certain period of time, the counter will be incremented, and by setting the count number in advance with the selection switch at which point in the song the playback will stop, the counter discrimination circuit will start accompaniment if the number of counters matches. After the signal output is faded out, a fast-forward state is entered, and the tape is stopped at the sensing tape section.

According to the above-described configuration, the present invention detects the presence or absence of an audio signal with an audio signal detection circuit by setting in advance at which position in the song the song should end when playing back an audio multiplexed tape. Count the number of presence/absence with a counter, and if it matches the preset number,
This means that the accompaniment signal can be faded out, and then the tape can be fast-forwarded to find the beginning of the tape and then stopped.

Embodiment FIG. 1 shows an embodiment of the present invention.
is an audio multiplexed tape, in which the accompaniment signal and the audio signal recorded on the tape 1 are reproduced by the reproduction element section 2 and the reproduction element section 3, and the output is the first one. Second equalizer amplifier 4, 6
Amplify it. 6 to 8 indicate the first to third resistors, respectively, and 9 indicates two volume volumes. The respective outputs of the audio side and accompaniment side are mixed by the output of volume 9, and the power is output by the next power amplifier 1o. Amplify, speaker 11
The playback sound is output. 12 is a negative terminal and indicates ground. Reference numeral 13 denotes an audio signal detection circuit, the output of which is input to a first counter circuit 14, and the output thereof is input to a counter discrimination circuit 18.

16 indicates the positive power supply, and the count up switch 1
Count the number of times 7 is turned on with a second count of 15.

The output of the second counter 16 is input to the counter discrimination circuit 18, and if the number of the first counter 14 and the number of the second counter 15 match, the discrimination circuit 18 outputs an "H" level. Ru.

Its output is connected to a fade-out circuit 2o.

The output of the fade-out circuit 2o is at the "L" level during the normal reproduction state, and gradually changes to the "H" level.

The collector of the transistor 21 is connected to the first accompaniment signal side line.
is connected between the resistor 6 and the second resistor 7, the emitter is connected to ground 12, and the base is connected to the fade-out circuit 2.
Connected to 0. 22 is the output of the counter discrimination circuit 19. When there is a signal at the "H" level, the signal is delayed for a certain period of time.
23 shows a delay inverting circuit that generates the L” level.
With the flip 70 tube circuit, the output is “Lo” in the stopped state.
” is at the level. 25 is the sensing pole, tape 1
The first flip-flop is configured to be inverted by detecting the sensing tape portion pasted on the top of the flip-flop. 26 is a second transistor whose collector is connected to one end of the motor 27 and whose emitter base is connected to the output of the first flip-flop. Reference numeral 28 denotes a second flip-flop, which is in playback mode in the stopped state, and its output is at the "L" level. 29 is a playback switch, and 3o is a fast-forward switch. When the fast-forward switch 30 is turned on, the output of the second flip-flop circuit is inverted and becomes "H" level.

34 is a third transistor, the collector and emitter of which are connected to both ends of the governor circuit (not shown) of the motor 27;
When an "H" level voltage is applied to the base, the governor circuit is shorted, the motor 27 becomes high speed, and fast forwarding is performed.

31 to 33 indicate first to third diodes.

Next, the operation will be explained. First, when only the first song of the song is to be sung, when the count-up switch 17 is turned on once, "1" is stored in the second counter 15 and outputted to the counter discrimination circuit 18.

Next, when the regeneration switch 29 is turned on, the first flip-flop circuit 23 is triggered via the third diode 33, the first flip-flop circuit 23 is inverted, the output becomes "H" level, and the second flip-flop circuit 23 is inverted. A bias is applied to the transistor 26, the second transistor 26 is switched on, and the motor 27 rotates. The accompaniment signal recorded on the tape 1 is reversely reproduced by the first reproduction element section 2, the audio track is reproduced by the second reproduction element section 3, and is equalized and amplified by equalizer amplifiers 4 and 6, respectively. and the power amplifier circuit 1 through the volume volume 9.
o, and the reproduced sound is output from the speaker 11. When one song is finished, the output of the second equalizer amplifier 5 is used to detect the presence or absence of audio in the audio presence/absence detection circuit 13.
When it is detected that there is no sound for a specific period of time (approximately 3 seconds), a pulse is generated at the output of the first counter 14, and the pulse is input to the counter discrimination circuit 18, which causes a preset second counter to be detected. Since the number matches the output from 15, the counter discrimination circuit 18 outputs an "H" level output. The output is input to the fade-out circuit 2°, and the output gradually becomes "H" level, the impedance of the first transistor 21 gradually decreases, the accompaniment signal gradually attenuates, and muting occurs. It takes completely. Further, the output of the counter discrimination circuit 18 is inputted to the delay inversion circuit 22, so that it outputs the "L" level after a specific time has elapsed. As a result, the second flip-flop circuit 28 is inverted, its output becomes "H", and the third transistor 34
A bias is applied to the base of the motor 27, the switching is turned on, the governor circuit of the motor 27 is short-circuited, and the motor 27 enters a fast forward state. Next, while the tape is being fast-forwarded, the sensing pole 25 is short-circuited by the sensing tape on the tape.
The first flip-flop 23 is reversed to stop the motor 2, and the second flip-flop 28 is reversed by applying a trigger via the first diode, thereby canceling the governor short circuit. Also, if you want to stop at the second verse of the song, turn on the count-up switch 1 twice, and the second verse will start.
By counting with the counter 15 and inputting the output to the counter discrimination circuit 18, the next time the tape is played back and the no-signal state occurs twice, the same operation as the first time can be performed. .

Effects of the Invention As described above, according to the present invention, it is possible to specify and play the first part of a song, or the first and second parts, and after playing, the accompaniment is faded out, and then the music is fast-forwarded. Therefore, you can listen to songs that suit your tastes more quickly and comfortably without having to perform any troublesome operations.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing an embodiment of the magnetic tape reproducing apparatus of the present invention, and FIGS. 2 and 3 are circuit diagrams of conventional magnetic tape reproducing apparatuses. 1...Audio multiplex tape, 2...Accompaniment signal reproducing element, 3...Audio signal reproducing element, 13
...Audio signal presence/absence detection circuit, 14...
10th counter, 15...Second counter, 1
8... Counter discrimination circuit, 20... Fade out circuit, 22... Delay inversion circuit, 2
3...First 7 lipflop, 28...
...Second flip-flop, 27...Motor. Name of agent: Patent attorney Toshio Nakao and 1 other person1-
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Claims (1)

[Claims] a detection means for detecting that there is no vocal for a specific time during playback of an audio multiplexed tape in which music and vocals are recorded on separate tracks; a first counter that counts up each time the detection means operates; a second counter that can be set; a counter discriminator that outputs an output when the counts of the first and second counters match; a fade-out means that fades out the playback signal of the audio multiplex tape; and an output of the discriminator. and a fast-forwarding means for fast-forwarding the audio multiplex tape, the fade-out means and the delaying means being operated by the output of the determining means during tape playback,
A magnetic tape reproducing apparatus characterized in that a tape fast-forwarding means is operated by the output of the delaying means.