JPH04302837A - Portable sound reproducing and loudspeaking device with autimatic program searching circuit fur music selection - Google Patents

Abstract

PURPOSE:To realize an automatic music selection program searching function suitable for 'KARAIKE' (orchestration without lyrics) while maintaining the respective characteristics of low power consumption, low cost,light weight and small-size in a portable 'KARAOKE' device. CONSTITUTION:By a switching decision circuit 10, a music selection mode signal (a) is sent based on the switching state of leaf switchs S1, S2 and S3 interlocking to the control button of a tape deck, by an intermusic stopping signal (b) from an intermusic stopping circuit 68 and a motor driving circuit 50 is stopped when the counted value of an up-down counter 66 set by a music selection button S4 is zero. By the motor driving circuit 50, a stop detecting signal (d) in sent to a high frequency oscillator 30 in an intermusic stopping state, by a forced stop deciding circuit 40, a forced stop signal (e) is sent to a low frequency oscillator 20 and the high frequency oscillator 30 in a forced stop state and a intermittent sound is outputted from a speaker 73 by an informing signal (g) from the high frequency oscillator 30 modulated with a flashing on and off signal (f) respectively.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a portable karaoke device in which an audio reproduction device, a speaker, and a microphone are integrally housed in a case, and in particular, to multifunctionalization of the audio reproduction device suitable for the portable karaoke device. Regarding technology.

0002

BACKGROUND OF THE INVENTION Conventionally, audio playback devices such as cassette tape players have an automatic cue function that can recognize song intervals in fast-forward playback mode and automatically stop tape running between songs. There is.

By the way, a small and lightweight portable karaoke device in which an audio reproduction device, a speaker, and a microphone are housed integrally in a case has been developed. This device has also been made multi-functional for use in karaoke, and devices equipped with the cue review function and automatic cue function are now on the market.

0004

[Problem to be Solved by the Invention] Generally speaking, installed type karaoke equipment requires the singer to select any desired song from a plurality of songs recorded on magnetic tape, etc. It is desirable to have a song selection automatic cue function that allows the user to select any song from a tape with multiple songs recorded and play it from the beginning, rather than just an auto cue function that allows playback from the beginning. . However, there are demands for portable karaoke devices to be smaller, lower in cost, lower in power consumption, etc., and it has been generally thought that these demands are in conflict with the multifunctionality of the device itself.

[0005] Furthermore, in the automatic song selection function provided in conventional audio playback devices, when the song selection operation is completed and the specified song is in the cue state, the playback operation is automatically started. When this is used for karaoke, there is a risk that the playback of the performance song will start before preparations are complete, contrary to the singer's will. Therefore, once the song selection operation starts, the singer, etc. should monitor the song selection operation of the playback device and always pay attention to the timing of song selection completion. It was necessary to perform operations such as stopping the equipment. Particularly in the case of portable karaoke devices, since singers themselves perform operations such as selecting music, there is a problem in that when canceling singing, operations such as stopping and restarting are complicated.

Furthermore, if the tape ends before this music selection operation is completed, tape running is forcibly stopped, which not only applies unnecessary tension and stress to the tape and mechanical system, but also reduces the load on the tape. If a slip mechanism is provided for this purpose, the wear of the slip mechanism is accelerated and power is wasted. Of course, there is an auto-stop mechanism that detects the end of a tape and releases the drive state, but auto-stop mechanisms in low-cost audio playback devices and portable karaoke devices that are required to be manufactured at low cost only operate during playback. It does not operate during fast forwarding or rewinding. This is because the inexpensive and lightweight auto-stop mechanism is activated based on a mechanical tape tension detection means integrated with the playback head of the tape deck, so the tape tension detection means cannot function during fast forwarding or rewinding. Because you can't. Of course, there is a method of electrically detecting the end of the tape and canceling the fast-forward or rewind operation, but this increases the price, weight, and power consumption of the tape deck.
It is not suitable for the above-mentioned low-cost and portable devices.

SUMMARY OF THE INVENTION The present invention is intended to solve the above-mentioned problems, and its object is to provide an audio playback and amplification system that is equipped with an automatic song selection function suitable for karaoke use while suppressing cost increases and power consumption. The object of the present invention is to provide a technology that can realize a device and add an automatic song selection function to an inexpensive and portable device without any trouble.

[0008]

[Means for Solving the Problems] In order to solve the above problems, we have provided a case body that houses a playback device that takes out a playback signal from a recording medium and a sound generation means that converts the signal into sound, and a It has a grip part connected to the case body and extending substantially parallel to the case body, and an audio input means integrally attached to the case body or the upper part of the grip part, and the reproduction signal and the input signal of the audio input means are connected to each other. In a portable audio reproduction and loudspeaker device that mixes and amplifies and outputs from a sounding means, the means taken by the present invention include a song interval detection means for detecting a no-signal state or a low-level state of a reproduced signal, and a predetermined initial count value. a counting means for subtracting or adding each time a song interval is detected by the song interval detection means; a counting value setting means that can change and set the counted value of the counting means; and a counting means that is activated when the counted value corresponds to a predetermined value. The apparatus is provided with an inter-song stop means for stopping power supply to the motor, and an inter-song stop canceling means for canceling the inter-song stop state and transitioning to a reproduction state. Here, the inter-song stop canceling means is
It is preferable to configure it with a mechanical system of a playback device that is activated based on an external operation such as a singer pressing a button.
Further, it is preferable to include a notification sound generating means for outputting a sounding signal to the sounding means based on the inter-musical stop state.

[0009] Furthermore, as an auto-stop function, although not limited to the time of music selection operation, a forced stop determining means is provided which activates the notification sound generating means when an overload state of the drive motor is detected.

Furthermore, the present invention further includes a count value display means for displaying the count value of the counting means, and a blinking signal generation means for sending a blinking signal to the count value display means and intermittent the sound signal of the notification sound generation means during the music selection operation. It is particularly effective to provide the display body of the count value display means at a position closer to at least one of the right and left sides of the installation position of the voice input means on the upper surface of the case body.

[0011]

[Operation] According to this means, the counting means holds the initial setting value or the count value set by the count value setting means,
Each time the song interval detection means detects a song interval during the music selection operation, the counted value is added or subtracted. When this count value corresponds to a predetermined value, the drive motor is stopped by the inter-song stopping means,
The song selection operation is completed. This inter-song stop state is maintained until the user activates the inter-song stop canceling means. Therefore, it is possible for the user to start playing the designated song at any time according to his or her will. If this inter-song stop canceling means is implemented in the mechanical system of the playback device, the operation from canceling the stop state to starting playback can be performed without consuming power, which saves energy for portable audio playback and public address equipment. This makes it possible to increase the lifespan of the built-in battery.

[0012] If a notification sound generation means is provided, the sound generation means generates the notification sound based on the sound generation signal when the inter-musical stop state is reached. Since the user knows that the music selection operation has been completed based on this notification sound, there is no need to monitor the music selection operation based on the tape running state or the like.

Next, during the music selection operation, for example, when the magnetic tape reaches the end of the tape, the forced stop determining means detects this and issues a forced stop detection signal. The notification sound generation means is activated based on this forced stop detection signal, and the sound generation means generates the notification sound. Of course, this forced stop determination means also functions during fast forwarding or rewinding operations. Therefore, if the user cuts off the power supply to the drive motor in accordance with the notification sound, no mechanical or electrical automatic release means is required, and weight, cost, and power consumption can be reduced.

[0014] In each of the above means, when a count value display means and a blinking signal generating means are provided, the count value can be displayed blinking during the music selection operation based on the blinking signal outputted by the blinking signal generating means. This notifies the user that the music selection operation is in progress, and also makes the notification sound an intermittent sound by modulating the sound signal based on this flashing signal. Furthermore, if the display body of the count value display means is provided at the upper part of the case body, close to either the left or right of the installation position of the voice input means, the singer can perform the task in a natural singing state (when the voice input means is not connected to the voice input means). You can easily check the song selection display with your mouth close to the player.

[0015]

Embodiments Next, embodiments of the present invention will be described with reference to the accompanying drawings.

(External Structure) FIGS. 1 to 5 show the external structure of an embodiment of a portable karaoke apparatus equipped with a music selection cue circuit according to the present invention. This device has a height of approximately 280mm.
, is a compact integrated karaoke device with a width of about 100 mm and a depth of about 150 mm, with a case body 12 in the shape of a vertically long rectangular parallelepiped on the front side, and an upper connecting part 10a and a lower connecting part on the back side of this case body 12. The microphone section 16 is generally composed of a cylindrical grip section 14 that is integrated through the grip section 10b, and a microphone section 16 that is provided through a microphone support section 17 that is continuously formed above the grip section 14.

The case main body 12 consists of an upper audio medium storage section 120 for storing a tape cassette, and a lower speaker storage section 130. On the side of the case of the audio medium storage section 120, a magnetic tape feeding operation is provided. A stop button 120a for stopping the playback circuit and opening the playback circuit power switch, and a fast forward button 12 for performing a high-speed feeding operation of the magnetic tape.
0b, rewind button 120 for performing high-speed rewind operation
c, a play button 120d for playing back the audio signal recorded on the magnetic tape, and a start button 120e for starting playback after the song selection operation is completed. Further, the front surface of the audio medium storage section 120 is covered by an opening/closing lid 121 that is hinged on the right side.

On the other hand, a mesh-like cover 134 is attached to the speaker housing section 130 on the output surface of the speaker, and an echo adjustment turntable 130a is provided on the left side of the case to adjust the echo sound (reverberation sound) of the microphone sound. , a tape/microphone volume adjustment turntable 130b is provided for adjusting the balance between the microphone volume and the tape playback volume, and on the right side is provided for adjusting the balance between the audio signal and the performance signal when playing an audio multiplex tape. Audio/performance adjustment turntable 1
30c is provided. These rotary disks have a surface area that is sufficiently larger than that of an adult's fingertip, and each of the surfaces has hemispherical protrusions m and hemispherical recesses n, so they can be easily rotated with one finger. Can be done. In addition,
A vocal volume erase button 130d is provided at the bottom of the audio/performance adjustment rotary board 130c to reduce the vocal volume and increase the performance volume when playing a normal tape with songs other than an audio multiplex tape. There is. Also,
The jack 130e is an input jack for an AC adapter used when using an external power source, and the jack 130f is an input jack for connecting a cord when using an external microphone, for example, when enjoying a duet.

On the left and right sides of the bottom of the speaker housing section 130, there are
Elastic legs 132a and 132b are provided to protrude from the gripping portion 14.
Together with the elastic legs 132c attached to the bottom of the device, they are arranged in a triangular shape to improve the standing stability of the device, prevent the device from slipping, and cushion shocks.

A through space 15 is defined between the grip part 14 and the case body 12, and on the upper front surface of the grip part 14 facing the through space 15, wavy irregularities 14a are formed in the vertical direction. The recesses are formed in several cycles, so that when the grip portion 14 is gripped, the pads of the fingers fit into the recesses to prevent the grip position from shifting. Further, a battery storage opening 14b is formed in the lower part of the back side of the gripping part 14, and a dry battery 14c is accommodated inside the gripping part 14. This housing position of the dry battery 14c contributes to miniaturization of the device, and at the same time contributes to improving the standing stability in terms of maintaining the weight balance with the case body 12.

An operating section 18 is formed on the back side of the gripping section 14 at approximately the same height as the upper connecting section 10a and at a position that can be operated with the thumb when gripped. , Volume dial 18 for volume adjustment
a, an audio auxiliary button 18b that outputs a vocal sound when pressed, and a song selection button 18c that is used to specify a song when selecting an automatic cue. Note that a microphone support part 17 extends above the operation part 18 in a cylindrical shape having approximately the same diameter as the grip part 14, and a bellows-shaped skin part 17a is formed on the microphone support part 17.

As shown in FIGS. 2 and 5, the main body case includes a front mold 1a, a right half mold 1b, and a left half mold 1 made of hard resin.
c are formed by fitting them together. Among these, in Figure 6,
The microphone portion 16 and microphone support portion 17 of the left half mold 1c are shown in an enlarged manner. This left mold half 1c is formed so that its skin portion B protrudes beyond the joint portion A, and the joint portion A is configured to engage with the right half mold that projects beyond the skin portion B. Here, a fitting hole 160a is formed in the center of the top of the upper microphone case part 160, and a fitting hole 160a is formed in the center of the top of the upper microphone case part 160, and the fitting hole 160a
50 has been inserted. Further, five parallel extension holes 160b are formed on the surface of the microphone case part 160,
This prevents vibration inhibition of the pressure receiving surface of the microphone 150 based on audio waves and howling based on vibration transmission from the main body. Note that 160c is a screw hole for matingly connecting the right half mold 1b and the left half mold 1c. A windshield sponge 16a made of a relatively low-density foamed resin (urethane foam) is attached to the microphone case portion 160 to prevent excessive sound pressure from being directly applied to the microphone 150. In this way, in this embodiment, since the microphone case part 160 is integrally molded with the case, the number of parts during manufacturing is reduced, and even during assembly, the microphone 150,
Since all of the wiring, battery 14c, etc. can be integrated after being attached to the right half mold 1b or the left half mold 1c, assembly becomes easy and manufacturing costs can be reduced.

On the other hand, a bellows-shaped skin part 17a is formed at the lower part of the microphone support part 17.

This bellows-shaped skin portion 17a has three curved portions 1 that protrude outward in a U-shape from the joint portion A whose diameter is slightly reduced.
It is composed of a skin part B having 70a, 170b, and 170c.

[0025] This bellows-shaped skin part 17a is similar to the other skin part B.
is formed with a thickness of 2.5 mm, whereas
The wall is made as thin as 1 mm, and this part absorbs and alleviates vibrations propagating from the main body. Further, a sound insulating wall 171 is formed above the bellows-like skin portion 17a to block sound waves propagating inside the microphone support portion 17. Here, sound absorbing members are attached to the upper and lower surfaces of the sound insulating wall 171 as necessary. In this manner, the structure of the microphone support portion reduces the amount of sound waves and vibrations that return to the microphone 150, thereby preventing howling.

In this embodiment, the case body 12 is formed into a curved shape that draws a convex arc forward in the direction of extension of the grip portion 14, and the front surface of the audio medium storage portion 120 is curved upward. , the front surface of the speaker housing section 130 faces downward. That is, as shown in FIG.
The front surface of the speaker storage section 130, that is, the output surface of the speaker, faces approximately 2 degrees upward with respect to the extending direction of the grip section 14.
It is oriented downward at 0 degrees. Speaker storage section 13
The angle of the front surface of the 0 with respect to the grip has the effect of preventing the output direction of the speaker from pointing upwards when the singer is holding the grip and singing, and also prevents deviation from the direction of the microphone's directivity center. Since it is made larger, it also has the effect of suppressing howling. On the other hand, the angle of the audio medium storage section 120 has the effect of eliminating the protrusion toward the front of the device and making the entire device more compact. In addition, since the case main body 12 has a curved shape as a whole, even when the distance between the upper part of the audio medium storage section 120 and the grip section is narrowed based on the request for compactness, the case body 12 has a curved shape that is sufficient for gripping. The through space 15 can be secured,
Moreover, the height of the case body, that is, the height of the entire device, which is determined to a predetermined value depending on the dimensions of the audio medium and the diameter of the speaker, can be suppressed.

Furthermore, the extending direction of the gripping portion 14 is formed so that it is tilted backward by approximately 5 degrees from the vertical direction when the device is in a standing state. , a relatively heavy case body 12
This has the effect of further improving standing stability by maintaining a weight balance with the

In this embodiment, a 7-segment LED display 140 is attached to the left side of the top surface of the case body 12 for displaying music selection in an automatic music selection cueing circuit to be described later. The portion that accommodates the LED display body 140 is located between the notch of the front mold 1a and the notch of the left half mold 1c. Since there is no hole in the case and the LED display body 140 is housed in the area where both the notches meet, the resin molding mold for the case only needs to be a male mold and a female mold, and there is no need to use a slide mold. Also good. Therefore, the manufacturing cost of the mold can be reduced. In this way, the LED display body 140
By being provided in the front position close to 6,
The singer can be visually recognized in a natural singing posture. Furthermore, since its position is on the left side, even when the user is not in a singing posture (for example, when the extension direction of the grip part is close to the vertical direction with the microphone part 16 kept away from the mouth), it is difficult for right-handed singers to sing. This makes it easy for a person to visually recognize the grip part 14 while gripping it with his or her right hand. This position can be placed closer to the right (this is better for left-handed people), but in any case, by forming it closer to either the left or right position, you will not be forced to look into the device from above. The music selection state can be easily checked without being in the shadow of the microphone section 16 or the microphone support section 17 without taking a posture. Note that this LED display 140 may be another display, such as a liquid crystal display (LCD).

(Circuit System Configuration) Next, FIG. 7 shows the basic circuit configuration of the playback circuit 70 employed in the tape deck built into the rear side of the audio medium storage section 120.

This reproducing circuit 70 includes an audio reproducing magnetic head 70a and a performance reproducing magnetic head 70b for reproducing an audio multiplexed tape, and the weak audio reproducing signal and performance reproducing signal respectively reproduced here are sent to a preamplifier. 71a
and 71b, and these amplified signals are mixed via resistors Ra1, Ra2 and Rb1, Rb2. Then, the power is amplified by the output amplifier 72 through the variable resistor Rvo adjusted by the volume dial 18a, and is sent to the speaker 73. Here, the audio auxiliary switch S5 is normally closed, and is opened when the audio auxiliary button 18b is pressed to send the audio reproduction signal to the speaker. The variable resistor Rp is used to determine the output ratio between the audio playback signal and the performance playback signal when the audio auxiliary switch S5 is closed. Adjustments are made by the audio/performance adjustment turntable 130c so as to achieve the desired performance. When the audio auxiliary switch S5 is opened,
The ground potential supplied through each divided resistance value of the variable resistor Rp is cut off, and the variable resistor Rp is disabled, so that the audio reproduction signal is output at approximately the same level as the performance reproduction signal. Therefore, if the singer forgets the lyrics, by pressing the audio auxiliary button 18b,
The speaker 73 transmits an audio reproduction signal in place of the singer's singing voice.
It can be flushed from

Note that the audio input signal inputted by the condenser microphone 150 attached to the microphone section 16 is amplified by the preamplifier 81, and then transmitted to the output section of the reproducing circuit 70 via the variable resistor RvI and the resistor Rm. The signal is mixed with the playback signal and the performance playback signal, and is output together from the speaker 73.

The audio playback signal and performance playback signal amplified by the preamplifiers 71a and 71b are respectively connected to resistors Ra.
3 and Rb3, and is also supplied via a capacitor C to a song interval detection circuit 67, which constitutes a part of an automatic music selection cue circuit. Hereinafter, with reference to the block configuration shown in FIG.
The automatic music selection cue circuit of this embodiment will be explained.

This automatic song selection circuit includes a switch determination circuit 10, a low frequency oscillation circuit 20, a high frequency oscillation circuit 30,
Forced stop determination circuit 40, motor drive circuit 50, autoset circuit 61, logic circuit 62, LED drive circuit 63, L
It is composed of an ED display 64, a set pulse generation circuit 65, an up/down counter 66, an inter-song detection circuit 67, and an inter-song stop circuit 68.

The switch determination circuit 10 includes a leaf switch S1 that opens and closes in conjunction with the play button 120d (PLAY), a leaf switch S2 that opens and closes in conjunction with the fast forward button 120b (FF), and a rewind button 120c (REW).
Depending on the open/close state of the leaf switch S3 linked to
A music selection mode signal a of level or L level is sent.

The operation of this switch determination circuit 10 is shown in Table 1 below.

[0036]

[Table 1]

Furthermore, when the music selection mode signal a is at H level, the low frequency oscillation circuit 20
The frequency is 2.5H when the forced stop signal e is supplied from
A blinking signal f of z is sent to the high frequency oscillation circuit 30 and the LED display 64. The high frequency oscillation circuit 30 receives the stop detection signal d from the motor drive circuit 50 and the forced stop determination circuit 40.
The frequency is 1.6 when the forced stop signal e is supplied from
A 7 kHz notification signal g is sent to the speaker 73. The forced stop determination circuit 40 detects from the motor drive circuit 50 that the electronic governor motor 51 has been forcibly stopped due to the end of the tape or other external force, and transmits the forced stop signal e to the low frequency oscillation circuit 20 and the high frequency oscillation circuit. Send on 30. The motor drive circuit 50 is in a driving state when the power is turned on.
Based on the inter-song stop signal b from the inter-song stop circuit 68, the current supply to the electronic governor motor 51 is stopped. The autoset circuit 61 initializes the logic circuit 62 and the up/down counter 66 when the music selection mode signal a becomes H level, and sets the count value of the up/down counter 66 to 1. The logic circuit 62 converts the output signal corresponding to the count value of the up/down counter 66 and sends it to the LED drive circuit 63. The LED drive circuit 63 sends a display signal to the LED display 64 to display the count value of the up/down counter 66. The set pulse generation circuit 65 is
A music selection setting signal is sent to the up/down counter 66 every time the music selection button S4 is pressed. The up/down counter 66 increments and stores the counted value by one each time it receives the music selection setting signal from the set pulse generation circuit 65, and stores the counted value by one.
Each time a song interval detection signal is received, the count value is subtracted by one and stored. The inter-song stop circuit 68 sends an inter-song stop signal b to the motor drive circuit 50 when the music selection mode signal a is at H level and the count value of the up/down counter 66 is zero.

Based on the above circuit configuration, the operation of the automatic music selection cue circuit will be explained.

First, when only the playback button 120d is pressed, power is turned on to all circuits, and the motor drive circuit 50 starts operating the electronic governor motor 51 for driving the reel of the tape cassette.
A reproduction signal from a reproduction circuit 70 which rotates and reproduces a compact cassette tape is sent to a speaker 73, and reproduction sound is output. In this state, the song interval detection circuit 67
Since the power is also turned on, the song interval detection circuit 67 detects the input state of the playback signal, and when the no signal state or low level state continues for 0.15 seconds, the up/down counter 6
A song interval detection signal is output to 6, and the count value is subtracted by one.

In this state, only the leaf switch S1 that is linked to the playback button 120d is in the on state, and the music selection mode signal a output from the switch determination circuit 10 is maintained at the L level.

In this state, in addition to the play button 120d,
When either the fast forward button 120b or the rewind button 120c is pressed, the tape begins to run fast forward or rewind, depending on the mechanism. Here, leaf switch S1
In addition, the leaf switch S2 or S3 is turned on, so the music selection mode signal a of the switch determination circuit 10 becomes H.
level, and the device starts the music selection operation.

At this time, the auto-set circuit 61 that receives the music selection mode signal a at the H level sets the logic circuit 62 and the up-down counter 66 to the initial state, and the up-down counter 66 has a count value of 1, which is the initial value. is set. This count value 1 is introduced into the logic circuit 62, and the LED
A 7-segment LED display 64 is driven by a drive circuit 63.
will be displayed at Here, press the song selection button S4,
By causing the set pulse generation circuit 65 to send a song selection setting signal to the up/down counter 66, the count value of the up/down counter 66 can be increased by one and set to an arbitrary value according to the specified song desired by the singer. It has become.

The music selection mode signal a is also input to the low frequency oscillation circuit 20, which causes the low frequency oscillation circuit 20 to oscillate and sends its blinking output f to the LED display 64, thereby changing the displayed count value. It is designed to be in a blinking state.

During this music selection operation, the up/down counter 6
The count value of 6 is subtracted by the song interval detection circuit 67 every time the song passes, and when the count value reaches zero, the song stop circuit 68 into which the H level song selection mode signal a is introduced,
The inter-song stop signal b is sent to the motor drive circuit 50. At this time, the motor drive circuit 50 stops the motor 51 and sends a stop detection signal d to the high frequency oscillation circuit 3.
0 input potential is forcibly raised to cause oscillation. The output g of this high frequency oscillation circuit 30 is the same as that of the low frequency oscillation circuit 20.
The signal is modulated by the blinking signal f and sent to the speaker 73, from which an intermittent sound is output. When this intermittent sound occurs, tape running is stopped between songs, but if the start button is pressed in this state,
As described later, the fast forward button FF in the pressed state
Alternatively, the rewind button REW is released, the normal playback state is restored, and playback of the designated song is started.

Next, a description will be given of the operation when the tape running is forcibly stopped due to the end of the tape or other mechanical failure before the song selection is completed in the above-mentioned song selection state. In this case, a large load stress is applied to the motor, and the driving current of the motor increases. The motor stop determination circuit 40 detects this increase in drive current and outputs a forced stop signal e, which raises the input potential of both the low frequency oscillation circuit 20 and the high frequency oscillation circuit 30, causing the speaker 73 to generate an intermittent sound. .

FIG. 9 shows the switch determination circuit 10 shown in FIG.
, a conceptual diagram of an example of the main circuit configuration of a low frequency oscillation circuit 20, a high frequency oscillation circuit 30, a motor stop determination circuit 40, and a motor stop circuit 50.

The parallel part of leaf switches S2 and S3 and the leaf switch S1 are connected in series between the 6V power supply voltage and the ground potential, and the leaf switch S1 and the leaf switch S2 or S3 are closed. The music selection mode signal a is configured to go to H level only at certain times. Here, the music selection switch S4 is connected to these switches, and when only the leaf switch S1 is closed, and when only the leaf switch S2 or S3 is closed, the set pulse generation circuit A ground potential is supplied to 65 to generate a music selection setting signal. When the leaf switch S1 and the leaf switch S2 or S3 are closed, the potential on the ground side of the song selection switch S4 increases, making it impossible to generate a song selection setting signal.

When the music selection mode signal a becomes H level, an H level potential is supplied to the autoset circuit 61, and the up/down counter 66 is initialized as described above. In addition, the input potential of the low frequency oscillation circuit 20 increases, 2.
A blinking signal f having a frequency of 5 Hz is generated to cause the LED display 64 to blink.

When song selection is completed in this state, an H level inter-music stop signal b is sent from the driver circuit 68, and an L level signal is sent to the transistor V via the NAND gate G3.
V1 is applied to the base of V1, and transistor V1 is cut off. Then, since the gate potential of transistor V3 rises, transistor V3 is also cut off, and motor 51 is stopped. In this state, the stop detection signal d transmitted via the resistor R1 and the diode D3 has a high potential, so the high frequency oscillation circuit 30 oscillates at about 1.67 kHz. Here, the blinking signal f of the low frequency oscillation circuit 20 is input to the high frequency oscillation circuit 30 via a diode, and when the potential of the blinking signal f decreases, the input potential of the high frequency oscillation circuit 30 also decreases, and the oscillation is stopped. Since the high frequency oscillation circuit 30 is stopped, the oscillation state of the high frequency oscillation circuit 30 is intermittent exactly at the period of the blinking signal f. Therefore, the notification signal g output from the high frequency oscillation circuit 30 is modulated at a cycle of 2.5 Hz, and the speaker 73 generates an intermittent sound.

Next, when the tape ends during the music selection operation and the motor 51 is forced to stop, an overload is applied to the motor and its drive current increases. In this example, the tape winding torque during fast forwarding or rewinding is 2 to 6 g.
cm, and the motor drive current at that time is 100mA
That's about it. On the other hand, in an overload state where tape running is forcibly stopped, the drive current is 400 to 500 m
It rapidly increases to level A.

Therefore, the resistance R set to 1.8Ω
2 voltage drop becomes 0.6V or more and transistor V2
turns on, the forced stop signal e becomes high potential,
The input potentials of both the low frequency oscillation circuit 20 and the high frequency oscillation circuit 30 are increased via the diodes D4 and D3. Therefore, in this case as well, the intermittent sound is output from the speaker 73 in the same way as when the music selection is completed. Here, in the song selection state, the input potential to the low frequency oscillation circuit 20 is already at a high potential due to the song selection mode signal a, so there is no need to take the trouble to supply a high potential via the diode D4. As a result, intermittent sounds are generated even in a simple fast-forward or rewind state where the music selection mode signal a is at L level.

[0052] In this automatic music selection circuit, the inter-music stop state occurs at the beginning of the specified music, and while this state is maintained, the completion of music selection is announced with an intermittent tone. Thereafter, when the start button 120e is operated based on a mechanism described later, the playback operation is started. Therefore, you can clearly hear the completion of song selection, and since playback does not start until you activate the start button, which will be described later, there is no need to consciously keep track of the progress of song selection.
Moreover, playback can be started at any time.

Furthermore, if the tape ends during song selection, fast forwarding or rewinding, the circuitry is configured to notify this with an intermittent sound, eliminating the need for any mechanical or electrical means to release the tape. It is possible to reduce the weight of the playback device or reduce the power consumption while reducing the applied load and preventing wear of the slip mechanism provided on the tape reel. Here, the number of songs up to the designated song is displayed on the LED display 64, and the number flashes during the song selection operation, so it can be clearly known visually that the song selection operation is in progress. . The low frequency oscillation circuit 20 for this flashing display also functions as a modulation means for making the notification sound outputted from the high frequency oscillation circuit 30 into an intermittent sound, so the circuit configuration can be simplified, and as described above. With this circuit configuration, it is possible to reduce the cost of the playback device.

(Configuration of Mechanical System) Finally, the mechanical system of the tape deck related to the automatic music selection cue circuit will be explained. FIG. 10 is an exploded perspective view of the tape deck in this embodiment, and FIGS. 11 to 16 are schematic plan views for explaining the locking and unlocking operations associated with each button operation of the tape deck.

This tape deck 400 has the stop button 120a, the fast forward button 120b, and the rewind button 1.
20c, play button 120d, and start button 12
0e are the respective engagement pieces 440, 433, 419, 4
It is fixed at 05,428.

Of these, protrusions S, T, and R are integrally formed on the back side of the fast forward button 120b, rewind button 120c, and play button 120d, respectively.
This presses the contacts of the leaf switches S2, S3, and S1 attached to the lower front side of the resin board 401. Switches whose contacts are closed when in the OFF state are subject to instability factors such as contact separation due to vibrations of the playback device, resulting in malfunctions, but on the contrary, the leaf switch S1, S2,S
3, when the playback button 120d, fast forward button 120b, and rewind button 120c are in the off state, their respective terminals are in an open state, and instability caused by contact separation is eliminated.

As shown in FIG. 10, the tape deck 400 is constructed by assembling necessary components on the front and back sides of a resin substrate 401. A reel shaft 402 that fits into the reel hole of the tape cassette protrudes from the front side of the resin substrate 401.
In addition, a play lever 404 equipped with a head assembly 403 incorporating an audio reproduction magnetic head 70a and a performance reproduction magnetic head 70b is connected to Y+ on the resin substrate 401,
It is attached so that it can slide freely in the Y-direction. This play lever 404 has an engagement piece 405 into which the back side of the play button 120d is fitted, and a coil spring 406 is installed between it and the resin board 401, and when it moves in the Y-direction, its elasticity increases. It is biased in the Y+ direction by the force.

On the other hand, a lower slide plate 407 and an upper slide plate 408 are attached to the back side of the resin substrate 401, as shown in FIG. Lower slide plate 407 is X+
, X- direction, and is biased in the X- direction when moved in the X+ direction by the elastic force of the torsion spring 407a. The upper slide plate 408 can slide on the lower slide plate 407 in the X+ and X- directions, and when it moves in the X+ direction, it is biased in the X- direction by the elastic force of the coil spring 408a. It has become.

Next, the operation of the mechanical system associated with the operation of the above-mentioned automatic music selection cue circuit will be explained. First, play button 120
When d is pressed, the contact of the leaf switch S1 shown in FIG. 10 closes, and the play lever 404 (shown by the dashed line in FIG. 12) is pushed in the Y-direction. This play lever 404 has a protrusion 409 extending to the back side through the through hole of the resin substrate 401.
is the sliding plate 410 (indicated by the two-dot chain line in FIG. 12).
When pushed in the direction, the protrusion 411 of the sliding plate 410 closes the leaf switch 412, which is a power switch. By closing this leaf switch 412, a power supply potential is supplied to the motor and circuit system. At the same time, the resin substrate 401
Another protrusion 413 of the play lever 404 that passes through presses the slope of the claw-like portion 414 of the lower slide plate 407, so that the lower slide plate 407 is moved to the torsion spring 40.
X+ along with the upper slide plate 408 against the elastic force of 7a.
direction, the protrusion 413 engages with the claw-like portion 414, and the play lever 404 is locked.

In this playback state, when the rewind button 120c shown in FIG. 10 is pressed, the leaf switch S3
When the contact point closes and the song selection operation starts, the
As shown in FIG. 3, the rewind lever 415 that fits into the rewind button 120c is pushed in the Y-direction against the elastic force of the torsion spring 416. As a result, the slope of the claw-like portion 417 of the rewind lever 415 moves toward the upper slide plate 408.
The upper slide plate 408 pushes the lower slide plate 407 against the elastic force of the coil spring 408a.
The claw-shaped portion 417 and the protrusion 418
The rewind lever 415 is locked by engagement with the rewind lever 415.

[0061] When the music selection operation is started in this way,
Based on the operation of the circuit system, the motor drive is stopped between songs immediately before the designated song.

[0062] In the conventional inter-song stopping method, when an inter-song stop signal is detected, the signal is generally converted into a mechanical driving force via an electromagnetic plunger, etc., and a release lever, etc., which will be described later, is moved. The motor was stopped by unlocking the play lever 404 and the rewind lever 415. However, when this electromagnetic plunger is activated, a current of several amperes is instantaneously generated, consuming a large amount of power. Furthermore, there is a conventional method of electrically locking the rewinding state, but this method also has the problem of large power consumption. In contrast, in this embodiment, a system is adopted in which the rewinding state is mechanically locked, the motor drive is stopped upon generation of the inter-track stop signal, and this is notified. Power consumption associated with canceling the return state can be saved. In the portable audio playback device of this embodiment, that is, the portable karaoke device, battery power can be used only for speaker output and playback operation, so even a lightweight battery can be used for a long time without replacing. .

[0063] Next, when the notification sound is output due to the inter-song stop state, the singer presses the start button 12 shown in FIG.
When 0e is pressed, the start lever 420 shown in FIG.
is Y- against the elastic force of the torsion spring 407a.
The protrusion 421 is pushed in the direction of the upper slide plate 408.
Push the opening slope part 422 of the upper slide plate 408
Move it in the + direction. As a result, the rewind lever 4
15 claw-like portions 417 and protrusions 418 of the upper slide plate 408
As shown in FIG. 14, the rewind lever 415 is released from the locked state and returns to the Y+ direction based on the elastic force of the torsion spring 416. Then, as the rewind button 120c returns to the Y+ direction, the leaf switch S3 also returns to the open state.

By opening this leaf switch S3,
The song selection mode signal a returns to the L level, the inter-song stop state of the motor drive circuit 50 is released, and the motor rotates to return to the playback mode. In this way, playback is started simply by pressing the start button 120e in the stopped state between songs, so it is very easy to operate, and singing can be started at any time depending on the singer's preparation status. can.

In the playback mode, when the fast forward button 120b shown in FIG. 10 is pressed, the rewind button 1 is also pressed.
This is the same as pressing 20c, and the leaf switch S
2 closes to start the song selection operation, the fast-forward lever 430 is pushed in the Y-direction against the torsion spring 416, and its claw-shaped portion 43 is pushed as shown in FIG.
The inclined portion 1 pushes the projection 432 of the upper slide plate 408 in the X+ direction, and the engagement of the claw-like portion 431 and the projection 432 locks the fast-forward lever 430.

When the start button 120e is pressed after transitioning to the inter-song stop state, the start lever 420 is pushed in the Y-direction as shown in FIG.
1 moves the upper slide plate 408 in the X+ direction by pushing the opening inclined part 422, as shown in FIG.
The engagement between the claw portion 431 and the protrusion 432 is released, and the locked state is released.

[0067]

[Effects of the Invention] As explained above, the present invention provides a portable audio playback and loudspeaker device with an automatic song selection cue circuit,
The apparatus is provided with inter-song stop canceling means for temporarily stopping the power supply to the drive motor by the inter-song stopping means immediately before a designated song, canceling the inter-song stopping state, and starting the reproduction operation. Therefore, the singer can start singing at any time depending on the state of preparation, and the need for the singer or the like to pay attention to the progress of the song selection operation is reduced. Here, if the inter-song stop canceling means is realized by the mechanical system of the playback device, there is no need to cancel the inter-song stop state or electrically drive the mechanical system, and there is no need to increase the power consumption of the device. , automatic song selection function can be added.

[0068] If a notification sound generation means is provided, the sound generation means generates a notification sound based on the sound generation signal when the inter-music stop state occurs, and the user is informed of the completion of the music selection operation based on this notification sound. Therefore, there is no need to monitor the music selection operation based on the tape running state or the like.

Next, not only when the recording medium is operating at high speed, but also when the tape running is forcibly stopped during the song selection operation, for example, when the magnetic tape ends as the recording medium.
The forced stop determination means detects this and issues a forced stop detection signal. The notification sound generation means is activated based on this forced stop detection signal, and the sound generation means generates the notification sound. Therefore, if the user cancels the drive state of the playback device according to this notification sound, it is possible to prevent stress on the tape, wear and tear on the mechanical system, and wasteful power consumption, while eliminating the need for mechanical or electrical automatic release means. Therefore, it is possible to reduce the weight, cost, and power consumption of the device.

In these means, when a count value display means and a blinking signal generation means are provided, the count value can be changed by sending a blinking signal output from the blinking signal generation means to the count value display means during music selection. While performing the flashing display, the notification sound can be made into an intermittent sound by intermittent sounding signals based on the flashing signal. That is, by making the blinking signal generation means have both the display blinking function and the sounding signal modulation function, it is possible to simplify the circuit configuration and reduce power consumption, while also making it possible to know from the blinking display that the song selection operation is in progress. At the same time, it is possible to enhance the alerting power of the notification sound.

[0071] When the above automatic song selection cue circuit is used in a portable audio playback and public address system, it is necessary to balance the demands for lower power consumption, lighter weight, and lower cost of the equipment with the addition of multiple functions. Can be done. In this case, by providing a display body for displaying the song selection on the upper part of the case body, on either the left or right side of the installation position of the voice input means, it is possible to create a natural singing state (with the mouth close to the voice input means). ) allows you to easily check the song selection display.

[Brief explanation of the drawing]

FIG. 1 is a front view showing the appearance of an embodiment of a portable karaoke device equipped with an automatic music selection cue circuit according to the present invention.

FIG. 2 is a plan view showing the appearance of the same embodiment.

FIG. 3 is a right side view showing the appearance of the same embodiment.

FIG. 4 is a left side view showing the appearance of the same embodiment.

FIG. 5 is a rear view showing the appearance of the same embodiment.

FIG. 6 is a cross-sectional view showing the structure near the microphone section in the left half mold of the same embodiment.

FIG. 7 is a conceptual circuit diagram showing the configuration of a reproduction circuit system in the same embodiment.

FIG. 8 is a block diagram showing the configuration of an automatic music selection cue circuit in the same embodiment.

FIG. 9 is a conceptual circuit diagram showing a configuration example of a main part of an automatic music selection cue circuit in the same embodiment.

FIG. 10 is an exploded perspective view of the tape deck in the same embodiment.

FIG. 11 is a schematic plan view of a mechanical system for explaining locking and unlocking operations associated with button operations of the tape deck.

FIG. 12 is a schematic plan view of a mechanical system for explaining locking and unlocking operations associated with button operations of the tape deck.

FIG. 13 is a schematic plan view of a mechanical system for explaining locking and unlocking operations associated with button operations of the tape deck.

FIG. 14 is a schematic plan view of a mechanical system for explaining locking and unlocking operations associated with button operations of the tape deck.

FIG. 15 is a schematic plan view of a mechanical system for explaining locking and unlocking operations associated with button operations of the tape deck.

FIG. 16 is a schematic plan view of a mechanical system for explaining locking and unlocking operations associated with button operations of the tape deck.

[Explanation of symbols]

1a Front type 1b
Right half type 1c
Left half mold 12 Case body 14 Grip part 15
Penetration space 16
Microphone section 17
Microphone support part 18
Operation unit 10 Switch determination circuit 20 Low frequency oscillation circuit 30 High frequency oscillation circuit 4
0 Forced stop judgment circuit 50
Motor drive circuit 51
motor 61
Autoset circuit 62
logic circuit 63
LED drive circuit 64 LE
D display 65 Set pulse generation circuit 66 Up/down counter 67 Between-song detection circuit 68 Between-song stop circuit 70 Reproduction circuit 73
Speaker S1, S2, S3
leaf switch

Claims (8)

[Claims] Claim 1: A case body in which a playback device that takes out a playback signal from a recording medium and a sound generation device that converts the signal into sound are housed; and a case body that is connected to the back side of the case body and extends substantially parallel to the case body. It has an extending grip part and an audio input means integrally attached to the case body or the upper part of the grip part, and mixes and amplifies the reproduced signal and the input signal of the audio input means to produce the sound generating means. In a portable audio playback and public address system that outputs from a counting means for subtracting or adding to the number, a counting value setting means for changing and setting the counted value of the counting means, and an inter-song stop for stopping power supply to the drive motor when the counted value of the counting means corresponds to a predetermined value. What is claimed is: 1. A portable audio playback and loudspeaker device equipped with an automatic music selection cue circuit, comprising means for canceling the inter-song stop state and transitioning the inter-song stop state to a playback state. 2. The portable audio playback device according to claim 1, wherein the inter-song stop canceling means is a mechanical system of the playback device activated based on an external operation. and public address equipment. 3. A mobile device according to claim 1 or claim 2, further comprising a notification sound generation means for outputting a sound generation signal to said sound generation means based on said inter-music stop state, and is equipped with an automatic music selection cue circuit. type audio reproduction and public address equipment. 4. The music selection automatic cue circuit according to claim 3, further comprising forced stop determination means for activating the notification sound generation means upon detection of an overload state of the drive motor. Portable audio playback and public address equipment. 5. A portable audio reproduction and public address system according to claim 1 or claim 2, comprising a count value display means for displaying the count value of said count means, and comprising an automatic music selection cue circuit. 6. A portable audio reproduction and public address system according to claim 3 or claim 4, comprising a count value display means for displaying the count value of said count means, and comprising an automatic music selection cue circuit. 7. The automatic music selection apparatus according to claim 6, further comprising a flashing signal generating means for sending a flashing signal to the count value display means and intermittent a sound signal from the notification sound generating means during the music selection operation. A portable audio playback and public address device equipped with a cue circuit. 8. In claim 5 or 6, the display body of the count value display means is provided at a position closer to at least one of the right and left sides of the installation position of the voice input means on the upper surface of the case body. A portable audio playback and public address device equipped with an automatic song selection cue circuit.