JPH11212551A - Reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reproducing device which can superpose sounds corresponding to music. SOLUTION: This reproducing device is provided with a BPF 2 which divides an inputted audio signal to plural bands, an envelope detection circuit 3 which detects an envelope value in each band, a register 5-1-2 which holds the envelope value for each band, a register 5-1-3 which shifts envelope values in time series to hold them, a difference circuit 5-1-1 which operates different values between preceding envelope values and current envelope values, a sound source generator 16 which generates plural effect sounds, a sound synthesizer 20 which superposes the inputted audio signal and effect sounds generated from the sound source generator 16, and a sound source selector 15 which switches a sound source generated from the sound source generator 16 based on operated difference values, and features of music are recognized by difference values to superpose sounds.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reproducing apparatus for superimposing a predetermined sound source in accordance with, for example, a reproduction signal level of audio reproduction.

[0002]

2. Description of the Related Art Conventionally, CD (compact disk) / M
D (mini-disc) deck operation unit, tuner operation unit, amplifier operation unit, speaker, CD and MD
There is a reproducing apparatus that reproduces an audio signal recorded in a recording device.

In such a reproducing apparatus, a CD or M
When reproducing the audio signal recorded in D, the user himself generates a sound according to the reproduced music by using a rhythm box or a drum pad so as to match the rhythm of the music.

[0004]

However, in the conventional reproducing apparatus, the sound of the rhythm box or the drum pad is adjusted to the reproduced sound with the sense of the user, so that the rhythm is shifted and all the music is supported. There is a disadvantage that the superimposed sound cannot be superimposed.

[0005] The present invention has been made in view of the above, and an object of the present invention is to provide a reproducing apparatus capable of superimposing sounds corresponding to all music.

[0006]

According to the present invention, there is provided a reproducing apparatus for dividing an input audio signal into a plurality of bands, and detecting an envelope value in each band divided by the band dividing means. Envelope detecting means, first storage means for holding the envelope value detected by the envelope detecting means for each band,
A second storage means for shifting the envelope value stored in the storage means in time series and holding the same, and the last envelope value shifted in time series and held in the second storage means. Calculating means for calculating a difference value of the current envelope value held in the first storage means;
Sound source generating means for generating a plurality of sound effects, superimposing means for superimposing the input audio signal and sound effects generated from the sound source generating means, and the sound source based on a difference value calculated by the calculating means. Sound source generation control means for switching a sound source generated from the generation means.

According to the reproducing apparatus of the present invention, the following operations are performed. The band dividing means acts to divide the input audio signal into a plurality of bands. The envelope detector operates so as to detect the envelope value in each band divided by the band divider. The first storage means acts to hold the envelope value detected by the envelope detection means for each band. The second storage means operates to shift the envelope values stored in the first storage means in time series and hold them. The calculating means operates to calculate a difference value between the previous envelope value shifted in time series held in the second storage means and the current envelope value held in the first storage means. The sound source generating means operates to generate a plurality of sound effects. The superimposing means acts so as to superimpose the input audio signal and the sound effect generated from the sound source generating means. The sound source generation control means acts to switch the sound source generated from the sound source generation means based on the difference value calculated by the calculation means.

[0008]

The present embodiment will be described below.
First, the configuration of the playback device of the present embodiment will be described with reference to the external perspective view shown in FIG.

In FIG. 4, a reproducing apparatus includes a CD / MD deck operating section 40 capable of operating a CD (compact disk) / MD (mini-disc), a tuner operating section 41 capable of receiving and operating an FM radio broadcast, An amplifier operation unit 42 capable of amplifying an audio signal, and speakers 43 and 44 for converting an audio signal amplified by the amplifier into sound.
And reproduces an audio signal recorded on a CD or MD. The CD / MD operation unit 40
The tuner operation unit 41 and the amplifier operation unit 42 are built in the same housing.

Here, in this embodiment, in particular,
A specific tempo is detected from the difference value of the envelope value of the reproduced audio signal, and the sound source generated by the sound source generating means is switched according to the specific tempo, so that the sound is automatically synchronized with the music to be reproduced. Are superimposed.

Next, a block diagram showing the configuration of the reproducing apparatus according to the present embodiment will be described with reference to FIG. In FIG. 1, a reproducing apparatus according to the present embodiment
There is provided a reproducing means 1 for reproducing an audio signal recorded in D and outputting an analog audio signal. The reproducing means 1 corresponds to the reproducing device shown in FIG. In addition, the reproduction display device of the present embodiment converts an analog audio signal into four.
Band pass filter BPF2-
1 (125 Hz), 2-2 (500 Hz), 2-3 (2
kHz), 2-4 (8 kHz), and an envelope detection circuit 3-1, 3-2, 3 for detecting an envelope of each band.
An A / D conversion circuit 4 for converting an analog audio signal detected by envelope detection into a digital value;
-1, 4-2, 4-3, 4-4, and arithmetic circuits 5-1, 5-2, 5-3, 5 for calculating a difference value between a previous sampling value and a current sampling value from a digital value. -4.

The arithmetic circuit 5-1 includes a register 5-1-3 for storing the previous sampling value, a register 5-1-2 for storing the current sampling value, and a register 5-1.
3 and the register 5-1.
-2 for calculating a difference from the current sampling value stored in -2. In addition, CPU
6, the latch signal is supplied to the register 5-1-2, and the reset signal is supplied to the register 5-1-3 at the end of each sampling. Although not shown, the arithmetic circuit 5-
2, 5-3 and 5-4 have the same configuration as the arithmetic circuit 5-1. That is, a register for storing the previous sampling value, a register for storing the current sampling value, and a previous sampling value stored in the register. A difference calculation circuit for calculating a difference between the value and the current sampling value stored in the register.

The reproducing apparatus according to the present embodiment has a bandpass filter BPF2-1 (125 Hz), 2-2.
(500 Hz), 2-3 (2 kHz), 2-4 (8 kHz)
z), the envelope detection circuits 3-1, 3-2, 3-
3, 3-4, A / D conversion circuits 4-1, 4-2, 4-3
4-4. Control of sampling operation and operation of arithmetic circuits 5-1 to 5-2, 5-3 to 5-4, and control of subsequent circuits. Sound generator 1 to be described later according to the tempo.
The CPU 6 controls the sound synthesizer 20 to superimpose the sound source generated by the sound synthesizer 20 on the reproduced audio signal. In addition, the playback device of the present embodiment selects a spectrum analyzer / animation selection key 7 for selecting whether to display a spectrum analyzer display or an animation display corresponding to music on a display unit described later, and selects a timbre to be superimposed on a playback sound described later. Key 8, a random selection key 9 for randomly selecting a sound to be superimposed on a sound reproduced by a sound source or a rhythm box described later, and arithmetic circuits 5-1 and 5-
Tempo measurement key 10 for starting measurement of the tempo of the reproduced sound by measuring the difference value by 2, 5-3, 5-4, and rhythm superimposition start for starting the superimposition of the sound on the reproduced sound by the sound source or rhythm box described later. Key 11
And

The tone to be superimposed by the tone selection key 8 is
As shown in FIG. 3, there are a percussion instrument sound 30, a sound effect 31, a human voice 32, and the like. In addition, the percussion instrument sound 30 is a sound of a drum, such as Tight kick, Loose sn.
are, Open / Close Hihat, Low /
High Tom, Side stick, Hand clap as Latin percussion instrument, Open / Close
Conga, Cabasa, Claves, Low /
High Cowbell, Tambourin, Te
chno kick, Low / High Whistl
e, Scratch. Thus, percussion sound 3
In the case of 0, there is a tone having the same tone color and two types of low tone and high tone (Low / High). In the percussion instrument sound 30,
Some of the same timbres have two types of resonance sound and shielding sound (Open / Close). Also, as the sound effect 31,
Punch, Beep, Squeal, Crush. In addition, Ha, Go, Hey,
Aoh, Shot, Yeah, Hoooo, Yah, S
exc.

The reproducing apparatus according to the embodiment has a display control means 12 for controlling display on the display, an image pattern memory (read only memory ROM) 13 for storing various image patterns to be displayed on the display, and , A display unit for displaying animation corresponding to music (fluorescent display tube FL:
Fluorescent character dis
simply tube / Liquid crystal display LCD: Liquid
crystal display) 14. The displayable range of the animation on the display unit is, for example,
It is 1 dot × 7 vertical dots, and is configured so that one of three colors can be displayed depending on the position of each dot.

The reproducing apparatus according to the present embodiment has a sound source selector 15 for selecting a sound to be superimposed on a reproduced sound, and a sound source generator 16 for generating a sound to be superimposed on the reproduced sound.
And a rhythm box selector 17 for selecting a rhythm to be superimposed on the reproduced sound, and a rhythm generator 18 for generating a rhythm to be superimposed on the reproduced sound.

Further, the reproducing apparatus according to the present embodiment has a sound source DSP for controlling a sound field based on a control signal supplied from the CPU 6 to an analog audio signal.
(Digital signal processo
r) 19, a voice synthesizer 20 for synthesizing a sound or rhythm to be superimposed on the reproduced sound, and a sound from the sound source generator 16 or a rhythm from the rhythm generator 18 based on a control signal supplied from the CPU 6. Switch 21 for selectively switching and supplying to speech synthesizer 20
(SW1) and a switch 22 (SW2) for selectively switching and outputting a sound field control output from the sound source DSP 19 and a sound or rhythm synthesis output from the voice synthesizer 20 based on a control signal supplied from the CPU 6. And a speaker 23 for converting an electric signal into a sound to reproduce music.

The operation of the reproducing apparatus of this embodiment having the above-mentioned configuration will be described with reference to the flowchart of FIG. In FIG. 1, a reproducing means 1 reproduces an audio signal recorded on a CD or MD and outputs an analog audio signal. The analog audio signal output from the reproducing means 1 is supplied to a bandpass filter BPF2-1 (1
25 Hz), 2-2 (500 Hz), 2-3 (2 kHz)
z), 2-4 (8 kHz). Bandpass filters BPF2-1 (125 Hz), 2-2 (500
Hz), 2-3 (2 kHz) and 2-4 (8 kHz) divide an analog audio signal into four bands. Here, the bandpass filter BPF2-1 (125H
z), 2-2 (500 Hz), 2-3 (2 kHz), 2
Each frequency of four bands of -4 (8 kHz) is a center frequency of the band. The operation of the band pass of the four bands is a resonance cavity type, and the value of Q representing the sharpness of resonance is 1.

The analog audio signal divided into four bands is supplied to an envelope detection circuit 3-1, 3-2, 3
-3, 3-4. Envelope detection circuit 3-
1, 3-2, 3-3, and 3-4 detect the envelope value of the signal of each band. The envelope value of the envelope-detected analog audio signal is converted by the A / D conversion circuit 4
-1, 4-2, 4-3, and 4-4. The A / D conversion circuits 4-1, 4-2, 4-3, 4-4 convert this envelope value into a digital value. This digital value is supplied to arithmetic circuits 5-1 to 5-2. The arithmetic circuits 5-1 to 5-2 calculate the difference between the previous sampling value and the current sampling value from the digital value.

Specifically, the arithmetic circuit 5-1 operates as follows. The register 5-1-3 stores the previous sampling value. The register 5-1-2 stores the current sampling value. The difference calculation circuit 5-1-1 calculates a difference between the previous sampling value stored in the register 5-1-3 and the current sampling value stored in the register 5-1-2. Although not shown, the arithmetic circuit 5-
2, 5-3, 5-4 operate in the same manner as the arithmetic circuit 5-1. That is, when n = 2-4, the previous sampling value is stored by the register 5-n-3, and the register 5-n- 2 to store the current sampling value, and calculate the difference
The difference between the previous sampling value stored in the register 5-n-3 and the current sampling value stored in the register 5-n-2 is calculated by -1.

In this way, a difference value between the envelope values of the audio signal is obtained. By calculating the difference between the sampling values in this way, a differential value, which is the degree of change in the envelope value, can be determined. That is, by detecting a predetermined pattern of the difference value, a constant pattern repeated in the audio signal can be obtained.

The CPU 6 includes a bandpass filter BPF2-1 (125 Hz), 2-2 (500 Hz),
From 2-3 (2 kHz) and 2-4 (8 kHz), envelope detection circuits 3-1, 3-2, 3-3, 3-4, A /
Control of sampling operation and control of arithmetic operation in D conversion circuits 4-1 4-2, 4-3, and 4-4 and arithmetic circuits 5-1 5-2, 5-3, and 5-4. In addition to the control of the circuit, the music tempo is measured from the difference value, and the sound source generated from the sound source generator 16 is controlled so as to be superimposed on the reproduced audio signal by the voice synthesizer 20 according to the tempo.

Here, the operation of the CPU 6 will be described with reference to the flowchart of FIG. In FIG. 2, starting, sampling is performed in step S1. Specifically, A / D
A / in conversion circuits 4-1, 4-2, 4-3, 4-4
Sampling of an envelope value for performing D conversion is performed. The time required for this sampling is 5 msec per band and 20 msec for 4 bands. In step S2, the A / D value is read. Specifically, the A / D conversion circuit 4
The digital envelope value that has been A / D converted in -1, 4-2, 4-3, and 4-4 is read. In step S3, the difference from the previous time is read. Specifically, the arithmetic circuits 5-1 and 5-
The difference value calculated in 2,5-3,5-4 is read.

In step S4, it is determined whether the mask setting time from the previous time has elapsed. Specifically, when the sound source generated by the sound source generator 16 is superimposed on the reproduced audio signal by the voice synthesizer 20, a minute time interval that cannot be perceived by the user among the time intervals of the superimposed sound sources is insensitive ( Set as a mask) set time. When the mask setting time has not elapsed, the process ends. When the mask setting time has elapsed, the following steps S5 to S10 are performed.

When the mask set time has elapsed in step S4, the process proceeds to step S5, and it is determined whether or not the difference value is a considerably large value. Specifically, the difference value is, for example, 1
It is determined whether it is 0 dB or more. When the difference value is a considerably large value in step S5, the process proceeds to step S6, and the first mask time is set. Specifically, the mask setting time in step S4 is set to a relatively
Set to 00 msec.

Then, the process proceeds to a step S9, and it is determined whether or not generation of a sound source is set to be selected by a random number. Specifically, the user selects the random selection key 9
When it is determined that generation of a sound source is selected by a random number when is pressed, the sound source selector 15
A control signal for selecting a sound source by a random number is supplied from 6, and the sound source generator 16 generates a sound source based on the random number based on the control signal for selecting the sound source by the random number. As the random number, for example, a running timer of the CPU 6 is used. The CPU 6 generates a control signal so that the assigned sound source is selected in accordance with the remainder of dividing the timer time T of the running timer by 29 when the random selection key 9 is pressed.

If it is determined in step S9 that the generation of the sound source is selected by a random number, step S10
Then, set to generate a sound source based on the random number. Specifically, the CPU 6 supplies a control signal for selecting a sound source to the sound source selector 15, and the sound source generator 16 generates a sound source based on the random number based on the control signal for selecting the sound source based on the random number.

If it is determined in step S9 that the generation of the sound source is not selected by the random number, and if it is set in step S10 that the generation of the sound source is to be performed based on the random number, the process proceeds to step S11. Then, in step S11, a percussion instrument sound is emitted. Specifically, for each sampling, the speech synthesizer 20 superimposes a sound source generated based on a random number generated from the sound source generator 16 on the reproduced audio signal. Thereby, for example, percussion instrument sound is superimposed on the music reproduced from the speaker 23 and output.

If the difference value is not a considerably large value in step S5, the process proceeds to step S7, and it is determined whether or not the difference value is a slightly large value. Specifically, it is determined whether or not the difference value is, for example, 6 dB or more. If the difference value is slightly larger in step S7,
Proceeding to step 8, the second mask time is set. In particular,
The mask setting time in step S4 is set to a relatively short time, for example, 250 msec. Then, step S9
Then, the same determination and processing of steps S9 to S11 as described above are performed.

When the difference value is not a slightly large value in step S7, and after the percussion instrument sound is emitted in step S11, the process proceeds to step S12 to store the current A / D value. Specifically, processing is performed so that the stored digital envelope value is used for the difference at the time of the next sampling, and the processing ends.

As described above, when the user plays the audio signal and listens to the music, the user measures the tempo of the music from the obtained difference value, and adjusts the tempo of the music according to the tempo of the music, for example, when the envelope value rises. Triggered by
By switching the sound source generated by the sound source generation means, it is possible to automatically superimpose the sound according to the music to be played, so that the music that is familiar to the user is changed to a different music Can be played. Also, since the sound is superimposed in accordance with the rhythm of the reproduced music, any music can be emphasized in rhythm, and can be reproduced like dance music.

The tempo measurement key 10 is used for calculating circuits 5-1 and 5-1.
By measuring the difference value according to 5-2, 5-3, and 5-4, C
It is possible to measure the tempo of the reproduced sound for PU6. Specifically, when the user presses the tempo measurement key 10, for example, an orange light-emitting diode provided on the surface of the key blinks, and the CPU 6 starts measuring the tempo of the music being played, Predetermined sampling time,
For example, after the elapse of the above-described 20 msec, when the measurement is completed, the green light emitting diode is turned on, and the display unit 14
The sound source generated from the sound source generator 16 corresponding to the music can be superimposed on the reproduced audio signal by the voice synthesizer 20. Therefore, for the user, the tempo measurement key 1
At the same time when 0 is pressed, the tempo of the music is measured, and it can be recognized by hearing that a sound source corresponding to this is superimposed on the reproduced audio signal.

The type of music may be identified by the above-described tempo measurement, and the sound source superimposed on the reproduced audio signal may be changed by recognizing the type of music.

The display control means 12 controls the display operation of the display 14 based on a control signal from the CPU 6. The image pattern memory (ROM) 13 stores various image patterns to be displayed on the display unit 14.

Further, the spectrum analyzer / animation selection key 7 enables the display section 14 to select whether to display a spectrum analyzer or an animation corresponding to music. Normally, the initial setting state is the animation selection state. When the user presses the spectrum analyzer / animation selection key 7, the display switches to the spectrum analyzer display, and when the user presses the spectrum analyzer / animation selection key 7 again, the mode switches to the animation selection state. ing.

As described above, the tone color selection key 8 enables selection of the tone color of the reproduced sound. When the user presses the tone selection key 8, the sound source selector 15 selects a sound to be superimposed on the reproduced sound based on a control signal from the CPU 6. The sound source generator 16 generates a selected sound to be superimposed on the reproduced sound.

A rhythm superimposition start key 11 starts superimposition of a sound on a sound reproduced by a sound source or a rhythm box. When the user presses the rhythm superimposition start key 11, the rhythm box selector 17 selects a rhythm to be superimposed on the reproduced sound based on a control signal from the CPU 6. The rhythm generator 18 generates a rhythm to be superimposed on the reproduced sound.

As described above, the random selection key 9 is
It is possible to randomly select a sound to be superimposed on a sound reproduced by a sound source or a rhythm box. When the user presses the random selection key 9, the sound source selector 15 or the rhythm box selector 17 selects a sound source or a rhythm to be superimposed on the reproduced sound based on a control signal from the CPU 6.

The sound source DSP 19 controls the sound field based on a control signal supplied from the CPU 6 to the analog audio signal. The analog audio signal subjected to the sound field control is supplied to the voice synthesizer 20.

The switch 21 (SW1) switches the sound source generator 16 based on a control signal supplied from the CPU 6.
And the rhythm from the rhythm generator 18 are selectively switched and supplied to the speech synthesizer 20. The voice synthesizer 20 synthesizes a sound or rhythm to be superimposed on the reproduced sound.

The switch 22 (SW2) controls the sound source DSP 1 based on a control signal supplied from the CPU 6.
9 and a sound or rhythm synthesis output from the voice synthesizer 20 are selectively switched and output. The speaker 23 converts an electric signal into a sound to reproduce music.

The reproducing apparatus according to the above-described embodiment detects the BPF 2 as band dividing means for dividing an input audio signal into a plurality of bands, and detects an envelope value in each band divided by the band dividing means. An envelope detection circuit 3 as an envelope detection means, and a register 5-1-2 as a first storage means for holding an envelope value detected by the envelope detection means for each band.
A register 5-1-3 as a second storage unit for shifting the envelope value stored in the first storage unit in time series and holding the same, and a register 5-1-3 for storing the envelope value in the second storage unit. The previous envelope value shifted serially and the first
Circuit as a calculating means for calculating the difference value of the current envelope value held in the storing means
Sound source generating means for generating a plurality of sound effects; superimposing means for superimposing an input audio signal and sound effects generated from the sound source generating means; and sound source generating means based on a difference value calculated by the calculating means. And sound source generation control means for switching the sound source generated from the music, so that the characteristic of the music can be recognized from the difference value of the envelope value, and the sound effect is superimposed according to the recognized music, and the change of the music is superimposed. It can be displayed in the rhythm of sound effects, and it can strongly appeal to the user for the dynamism of music.

Thus, the effect of the demonstration at the store can be improved. Further, since the hardware configuration can be realized by improving the software without changing the conventional configuration, there is an advantage that there is no cost increase. Thus, the added value of the playback device of the present embodiment can be improved.

Further, in the reproducing apparatus of the present embodiment, the specific tempo is detected from the difference value and the sound source generated by the sound source generating means is switched according to the specific tempo. Intense sound effects can be superimposed on strong music, and soft effect sounds can be superimposed on gentle music.

Further, in the reproducing apparatus of the present embodiment, in the above description, the sound sources generated by the sound source generating means have a low tone and a high tone with the same timbre. Sound effects can be superimposed.

Further, in the reproducing apparatus of the present embodiment, the mask setting time is provided between the previous time and the present time depending on whether the difference value is larger or smaller than the predetermined value. By setting the time relatively long, it is possible to superimpose a dynamic sound effect with a large impact such as a stop motion.On the contrary, when the difference value is small, the mask setting time is set relatively short By doing so, gentle and smooth sound effects can be superimposed.

Further, in the reproducing apparatus of the present embodiment, in the above description, the timbre of the sound source generated by the sound source generating means is randomly selected using random numbers, so that when the specific timbre is superimposed, It is possible to superimpose a sound effect that is less predictable.

[0048]

According to the present invention, there is provided a reproducing apparatus comprising: band dividing means for dividing an input audio signal into a plurality of bands; and envelope detecting means for detecting an envelope value in each band divided by the band dividing means. A first storage unit for storing the envelope value detected by the envelope detection unit for each band, and a second storage unit for shifting the envelope value stored in the first storage unit in time series and holding the same. And an arithmetic operation for calculating a difference value between a previous envelope value shifted in time series held in the second storage means and a current envelope value held in the first storage means. Means, sound source generating means for generating a plurality of sound effects, superimposing means for superimposing the input audio signal and sound effects generated from the sound source generating means, And sound source generation control means for switching the sound source generated from the sound source generation means based on the difference value calculated by the calculation means, so that the characteristic of the music can be recognized from the difference value of the envelope value, and according to the recognized music. This makes it possible to superimpose the sound effect, thereby displaying the change in the music in the rhythm of the superimposed sound effect, so that the user can strongly appeal to the user for the dynamism of the music.

Further, in the reproducing apparatus of the present invention, a specific tempo is detected from the difference value and a sound source generated by the sound source generating means is switched according to the specific tempo. Intense sound effects can be superimposed on music with strong music, while soft effects can be superimposed on music with a gentle flow.

Further, in the reproducing apparatus of the present invention, the sound source generated by the sound source generating means has a low tone and a high tone in the same tone, so that a wider range of bass and treble in the same tone can be obtained. An effect that sound can be superimposed can be obtained.

Further, in the reproducing apparatus of the present invention, the mask setting time is provided between the previous time and the current time depending on whether the difference value is larger or smaller than the predetermined value. By setting the setting time relatively long, it is possible to superimpose a dynamic sound effect with a large impact such as a stop motion.On the contrary, when the difference value is small, the mask setting time is set relatively short. By setting, it is possible to produce an effect that gentle and smooth sound effects can be superimposed.

Further, in the reproducing apparatus of the present invention, in the above description, the tone color of the sound source generated by the sound source generating means is selected at random using random numbers. Thus, it is possible to achieve an effect that the effect sound can be superimposed without predictability.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a playback device according to the present embodiment.

FIG. 2 is a flowchart showing an operation of the playback device of the present embodiment.

FIG. 3 is a diagram illustrating an example of a tone color of the playback device of the present embodiment.

FIG. 4 is an external perspective view of the playback device of the embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Reproduction means, 2 ... BPF, 3 ... Envelope detection circuit, 4 ... A / D conversion circuit, 5 ... Operation circuit, 6 ... CPU,
7 ... Spreader / animation selection key, 8 ... Tone selection key, 9 ... Random selection key, 10 ... Tempo measurement key,
11 ... rhythm superimposition start key, 12 ... display unit control means, 13 ... image pattern memory, 14 ... display unit, 15 ...
Sound source selector, 16: Sound source generator, 17: Rhythm box selector, 18: Rhythm generator, 19: D for sound source
SP, 20: voice synthesizer, 21: switch (SW)
1), 22 ... switch (SW2), 23 ... speaker,
30 ... percussion instrument sound, 31 ... sound effect, 32 ... human voice, 40 ...
CD / MD deck operation part, 41 ... Tuner operation part, 4
2 ... Amplifier operation unit, 43 ... Speaker, 44 ... Speaker, 45 ... Display unit, 46 ... Key,

Continued on the front page (72) Inventor Masayuki Mizuki No. 423 Shimozuma, Shimotsuma-shi, Ibaraki Pref.

Claims (5)

[Claims] 1. A band dividing unit for dividing an input audio signal into a plurality of bands, an envelope detecting unit for detecting an envelope value in each band divided by the band dividing unit, and an envelope detecting unit. First storage means for holding the detected envelope value for each band, second storage means for holding the envelope value stored in the first storage means in time series and holding; Computing means for computing a difference value between a previous envelope value shifted in time series held in the second storage means and a current envelope value held in the first storage means; Sound source generating means for generating the sound signal; superimposing means for superimposing the input audio signal and the sound effect generated from the sound source generating means; Reproducing apparatus characterized in that it comprises a sound source generating control means for switching a sound source generated from the sound source generating unit on the basis of the difference value. 2. The reproducing apparatus according to claim 1, wherein a specific tempo is detected from the difference value, and a sound source generated by the sound source generating means is switched according to the specific tempo. Playback device. 3. The display device according to claim 1, wherein the sound sources generated by said sound source generation means have a low tone and a high tone with the same timbre. 4. The reproducing apparatus according to claim 1, wherein a mask setting time is provided between the previous time and the current time depending on whether the difference value is larger or smaller than a predetermined value. 5. The reproducing apparatus according to claim 1, wherein a tone color of a sound source generated by said sound source generating means is randomly selected by using a random number.