JP4641568B2 - Display device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a display device that performs predetermined display according to a playback signal level of audio playback, for example.
[0002]
[Prior art]
Conventionally, there has been a playback device that plays back an audio signal recorded on a CD or MD, comprising a CD (compact disc) / MD (mini disc) deck operation unit, a tuner operation unit, an amplifier operation unit, and a speaker. .
[0003]
In such a reproducing apparatus, an audio signal recorded on a CD or MD is divided into a plurality of bands, and a band-like display is performed on the liquid crystal display unit according to the level of the audio signal. Such a display is a spectrum analyzer display that allows you to directly view the distribution and amplitude of the fundamental wave and its harmonic components on the screen by decomposing the electrical signal into frequency components and displaying the frequency and amplitude. Is simplified.
[0004]
[Problems to be solved by the invention]
However, since the conventional playback apparatus performs the same display as the spectrum analyzer, there is a problem that the display is limited to the instantaneous sound range level and cannot be actively displayed in correspondence with the music.
[0005]
SUMMARY An advantage of some aspects of the invention is that it provides a display device capable of actively displaying images corresponding to music.
[0006]
[Means for Solving the Problems]
The display device of the present invention includes a band dividing unit that divides an input audio signal into a plurality of bands, an envelope detecting unit that detects an envelope value in each band divided by the band dividing unit, and the envelope detecting unit. A first storage means for holding the envelope value detected in each band for each band, and a second storage for shifting and holding the envelope value stored in the first storage means in time series for each band The difference value between the storage means and 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 is obtained for each band. A calculation means for calculating; an image memory storing a plurality of display patterns; a display means for displaying a display pattern read from the image memory; and the calculation means. Set the mask setting time which varies according to the magnitude of the difference value of any of the band, which is calculated Te When the above mask setting time elapses Image memory control means for changing a display pattern generated from the image memory.
[0007]
The display device of the present invention operates as follows.
The band dividing means acts to divide the input audio signal into a plurality of bands. The envelope detection means operates to detect the envelope value in each band divided by the band dividing means. The first storage means acts to hold the envelope value detected by the envelope detection means for each band. The second storage means acts to shift and hold the envelope values stored in the first storage means in time series. The calculation 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 image memory operates to store a plurality of display patterns and read the plurality of display patterns. The display means operates to display the display pattern read from the image memory. The image memory control means acts to change the display pattern generated from the image memory in accordance with the difference value calculated by the calculation means.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, this embodiment will be described. First, the configuration of a playback apparatus to which the display device of this embodiment is applied will be described with reference to an external perspective view shown in FIG.
[0009]
In FIG. 4, the playback apparatus includes a CD / MD deck operation unit 40 capable of reproducing CD (compact disc) / MD (mini disc), a tuner operation unit 41 capable of receiving FM radio broadcasts, and an audio signal. The amplifier operation unit 42 that can be amplified and speakers 43 and 44 that convert the audio signal amplified by the amplifier into sound are used to reproduce the audio signal recorded on the 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 casing.
[0010]
Here, in particular, in this embodiment, the display unit 45 simply divides an audio signal recorded on a CD or MD into a plurality of bands and displays a band-like display according to the level of the audio signal. In addition to such a display, in response to music played through the speaker from the CD / MD operation unit 40 or the tuner operation unit 41, for example, if the music has a strong beat, an intense motion animation is displayed. On the other hand, if the music has a gentle flow, a soft motion animation is displayed so that a positive image is displayed.
[0011]
Next, a block diagram illustrating a configuration of the display device of the present embodiment will be described with reference to FIG.
In FIG. 1, the display device according to the present embodiment includes a playback device 1 that plays back an audio signal recorded on a CD or MD and outputs an analog audio signal. The playback device 1 corresponds to the playback device shown in FIG. In addition, the display device of the present embodiment has bandpass filters BPF2-1 (125 Hz), 2-2 (500 Hz), 2-3 (2 kHz), 2-4 (8 kHz) that divide the analog audio signal into four bands. ), Envelope detection circuits 3-1, 3-2, 3-3 and 3-4 for detecting the envelope of each band, and an A / D conversion circuit 4 for converting the analog audio signal detected by the envelope detection into a digital value. 1, 4-2, 4-3, 4-4, and arithmetic circuits 5-1, 5-2, 5-3, 5- 4.
[0012]
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 the previous sampling stored in the register 5-1-3. And a difference calculation circuit 5-1-1 that calculates a difference between the value and the current sampling value stored in the register 5-1-2. Note that a latch signal is supplied from the CPU 6 to the register 5-1-2, and a reset signal is supplied to the register 5-1-3 at the end of each sampling. Although not shown, the arithmetic circuits 5-2, 5-3, and 5-4 also have the same configuration as the arithmetic circuit 5-1, that is, a register that stores the previous sampling value and the current sampling value. A register, and a difference calculation circuit that calculates a difference between a previous sampling value stored in the register and a current sampling value stored in the register.
[0013]
Further, the display device according to the present embodiment includes an envelope detection circuit 3-1, from bandpass filters BPF2-1 (125 Hz), 2-2 (500 Hz), 2-3 (2 kHz), and 2-4 (8 kHz). 3-2, 3-3, 3-4, A / D conversion circuit 4-1, 4-2, 4-3, 4-4, arithmetic circuit 5-1, 5-2, 5-3, 5-4 In addition to the control of the sampling operation and the calculation operation, and the control of the subsequent circuit, the CPU 6 has a CPU 6 for measuring the music tempo from the difference value and controlling the animation display on the display unit described later according to the tempo. . The display device according to the present embodiment also includes a spectrum analyzer display or a spectrum analyzer display key 7 for selecting whether to display an animation corresponding to the music specific to the present embodiment on the display unit described later, and the tone of the reproduced sound. A tone selection key 8 for selecting a sound, a random selection key 9 for randomly selecting a sound to be superimposed on a reproduced sound by a sound source or a rhythm box, which will be described later, and arithmetic circuits 5-1, 5-2, 5-3, 5-4. Has a tempo measurement key 10 for starting measurement of the tempo of the reproduced sound by measuring the difference value, and a rhythm superposition start key 11 for starting superimposition of the sound on the reproduced sound by the sound source or rhythm box described later.
[0014]
Further, the display device according to the present embodiment includes a display unit control unit 12 that controls display on the display unit, an image pattern memory (read-only memory ROM) 13 that stores various image patterns to be displayed on the display unit, and the present embodiment. And a display unit (fluorescent display tube FL / liquid crystal display device LCD: Liquid crystal display) 14 that displays an animation corresponding to the music unique to the form. The range in which the animation of the display unit can be displayed is, for example, 11 horizontal dots × 7 vertical dots, and is configured so that one of the three colors can be displayed depending on the position of each dot.
[0015]
In addition, the display device according to the present embodiment includes a sound source selector 15 that selects a sound to be superimposed on the reproduction sound, a sound source generator 16 that generates a sound to be superimposed on the reproduction sound, and a reproduction sound. It has a rhythm box selector 17 for selecting a rhythm to be superimposed and a rhythm generator 18 for generating a rhythm to be superimposed on the reproduced sound.
[0016]
In addition, the display device according to the present embodiment superimposes a sound source DSP (Digital signal processor) 19 that controls a sound field based on a control signal supplied from the CPU 6 with respect to an analog audio signal, and a reproduced sound. A sound synthesizer 20 for synthesizing the sound or rhythm to be generated, and a sound from the sound generator 16 or a rhythm from the rhythm generator 18 are selectively switched based on a control signal supplied from the CPU 6 and supplied to the sound synthesizer 20. A switch 21 (SW1) that selectively switches between a sound field control output from the sound source DSP 19 and a sound or rhythm synthesis output from the speech synthesizer 20 based on a control signal supplied from the CPU 6 and outputs the switch 22 (SW2) and convert the electrical signal to sound and play music And a speaker 23.
[0017]
The operation of the display device of this embodiment configured as described above will be described with reference to the flowchart of FIG.
In FIG. 1, a playback apparatus 1 plays back an audio signal recorded on a CD or MD and outputs an analog audio signal. The analog audio signal output from the playback apparatus 1 is supplied to bandpass filters BPF2-1 (125 Hz), 2-2 (500 Hz), 2-3 (2 kHz), and 2-4 (8 kHz). Bandpass filters BPF2-1 (125 Hz), 2-2 (500 Hz), 2-3 (2 kHz), and 2-4 (8 kHz) divide the analog audio signal into four bands. Here, each frequency of the four bands of the bandpass filters BPF2-1 (125 Hz), 2-2 (500 Hz), 2-3 (2 kHz), and 2-4 (8 kHz) is the center frequency of the band. The band-pass operation of the four bands is a resonant cavity, and the value of Q representing the sharpness of resonance is 1.
[0018]
The analog audio signals divided into four bands are supplied to envelope detection circuits 3-1, 3-2, 3-3, 3-4. Envelope detection circuits 3-1, 3-2, 3-3, and 3-4 detect the envelope value of each band signal. The envelope value of the analog audio signal subjected to the envelope detection is supplied to the A / D conversion circuits 4-1, 4-2, 4-3 and 4-4. The A / D conversion circuits 4-1, 4-2, 4-3 and 4-4 convert the envelope values into digital values. This digital value is supplied to the arithmetic circuits 5-1, 5-2, 5-3 and 5-4. The arithmetic circuits 5-1, 5-2, 5-3, and 5-4 calculate a difference value between the previous sampling value and the current sampling value from the digital value.
[0019]
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 the 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 circuits 5-2, 5-3, and 5-4 operate in the same manner as the arithmetic circuit 5-1, that is, when n = 2 to 4, the previous operation is performed by the register 5-n-3. The sampling value is stored, the current sampling value is stored in the register 5-n-2, and the previous sampling value stored in the register register 5-n-3 by the difference arithmetic circuit 5-n-1 and the register 5-n The difference from the current sampling value stored in -2 is calculated.
[0020]
In this way, a difference value between the envelope values of the audio signal is obtained. Thus, the differential value which is the degree of a change of an envelope value can be calculated | required by calculating | requiring the difference value of each sampling value. That is, by detecting a predetermined pattern of difference values, a certain pattern that is repeated in the audio signal can be obtained.
[0021]
The CPU 6 uses envelope detection circuits 3-1, 3-2, 3- from the bandpass filters BPF2-1 (125 Hz), 2-2 (500 Hz), 2-3 (2 kHz), 2-4 (8 kHz). 3, 3-4, A / D conversion circuit 4-1, 4-2, 4-3, 4-4, arithmetic circuit 5-1, 5-2, 5-3, 5-4 In addition to controlling the control and calculation operations, the circuit of the subsequent stage is controlled, and in particular, the music tempo is measured from the difference value, and the animation display is controlled on the display unit 14 according to the tempo.
[0022]
Here, the operation of the CPU 6 will be described with reference to the flowchart of FIG.
In FIG. 2, sampling is started in step S1. Specifically, sampling of envelope values for A / D conversion in the A / D conversion circuits 4-1, 4-2, 4-3, and 4-4 is performed. The time required for this sampling takes 5 msec per band and 20 msec for 4 bands. In step S2, the A / D value is read. Specifically, the digital envelope value that has been A / D converted by the A / D conversion circuits 4-1, 4-2, 4-3, and 4-4 is read. In step S3, the difference from the previous time is read. Specifically, the difference value calculated by the arithmetic circuits 5-1, 5-2, 5-3, 5-4 is read.
[0023]
In step S4, it is determined whether the mask setting time from the previous time has elapsed. Specifically, a minute time interval that cannot be perceived by the user among the time intervals of the animation picture movement displayed on the display unit 14 is set as a dead time (mask) setting time. Then, when the mask setting time does not elapse, the process ends. When the mask setting time elapses, the following steps S5 to S10 are performed.
[0024]
When the mask setting 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, it is determined whether or not the difference value is 10 dB or more, for example. When the difference value is a considerably large value in step S5, the process proceeds to step S6 to set the first mask time. Specifically, the mask setting time in step S4 is set to a relatively long time, for example, 500 msec. In step S9, one animation picture displayed on the display unit 14 is moved. Specifically, for each sampling, animation pictures displayed on the display unit 14 are sequentially sent, for example, in order of 170 sheets.
[0025]
If the difference value is not a very large value in step S5, the process proceeds to step S7 to determine 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 a little larger in step S7, the process proceeds to step S8 to set the second mask time. Specifically, the mask setting time in step S4 is set to a relatively short time, for example, 250 msec. In step S9, one animation picture displayed on the display unit 14 is moved.
[0026]
When the difference value is not a little large in step S7 and after moving one picture in step S9, the process proceeds to step S10, and the current A / D value is stored. Specifically, the stored digital envelope value is processed so as to be used as the difference at the next sampling, and the processing is terminated.
[0027]
In this way, when the user plays the audio signal and listens to the music, the tempo of the music is measured from the obtained difference value, and is synchronized with the tempo of the music, for example, at the rise of the envelope value as a trigger. Since the animation pictures can be sequentially moved and displayed on the display unit 14, it is possible to visually appeal to the user the vigorous feeling of music.
[0028]
The tempo measurement key 10 enables the CPU 6 to measure the tempo of the reproduced sound by measuring the difference value by the arithmetic circuits 5-1, 5-2, 5-3, and 5-4. 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, When the measurement is completed after a predetermined sampling time, for example, 20 msec described above has elapsed, the green light-emitting diode is turned on, and an animation display corresponding to music can be displayed on the display unit 14. Therefore, it is possible for the user to visually recognize that the tempo of the music is measured at the same time as pressing the tempo measurement key 10 and an animation corresponding to this is displayed on the display unit 14.
[0029]
Further, the display control unit 12 controls the display operation of the display unit 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. FIG. 3 shows an example of an image pattern. In FIG. 3, a pattern 30 represents a small state of fireworks that have been launched, a pattern 31 represents a large state of fireworks that have been launched, and a pattern 32 represents a state in which fireworks that have been launched are scattered. By sequentially supplying the patterns 30 to 32 to the display unit 14 in accordance with the music tempo and displaying them, an animation corresponding to the music can be displayed. Here, each pattern 30-32 is comprised by the data corresponding to the horizontal 11 dot x vertical 7 dot which is the range which can display the animation of the display part mentioned above, red, orange, One of the three blue colors is displayed. Note that this pattern is an example, and it goes without saying that other animations may be used.
[0030]
Further, the type of music may be identified by the above-described tempo measurement, and the movement of the animation displayed on the display unit 14 may be changed by recognizing the type of music.
[0031]
Further, the spectrum analyzer / animation selection key 7 makes it possible to select whether to display the spectrum analyzer on the display unit 14 or to display an animation corresponding to music specific to the present embodiment. Normally, the initial setting state is the animation selection state. When the user presses the spectrum analyzer / animation selection key 7, the spectrum analyzer display is displayed. When the user presses the spectrum analyzer / animation selection key 7 again, the animation selection state is switched. ing.
[0032]
The tone color selection key 8 enables selection of the tone color of the reproduced sound. When the user presses the tone color selection key 8, the sound source selector 15 selects a sound to be superimposed on the reproduction 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.
[0033]
The rhythm superposition start key 11 starts superimposition of sound with respect to the reproduced sound by the sound source or the rhythm box. When the user presses the rhythm superposition 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.
[0034]
The random selection key 9 makes it possible to randomly select a sound to be superimposed on the sound reproduced by the sound source or the 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 rhythm to be superimposed on the reproduced sound based on a control signal from the CPU 6.
[0035]
The sound source DSP 19 controls the sound field based on the 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 speech synthesizer 20.
[0036]
The switch 21 (SW1) selectively switches the sound from the sound source generator 16 or the rhythm from the rhythm generator 18 based on the control signal supplied from the CPU 6 and supplies it to the speech synthesizer 20. The voice synthesizer 20 synthesizes a sound or rhythm to be superimposed on the reproduced sound.
[0037]
The switch 22 (SW2) selectively switches and outputs the sound field control output from the sound source DSP 19 and the sound or rhythm synthesis output from the speech synthesizer 20 based on the control signal supplied from the CPU 6. The speaker 23 converts the electric signal into sound and reproduces music.
[0038]
The display device according to the present embodiment described above includes a BPF 2 as a band dividing unit that divides an input audio signal into a plurality of bands, and an envelope detection unit that detects an envelope value in each band divided by the band dividing unit. As an envelope detection circuit 3, a register 5-1-2 as first storage means for holding the envelope value detected by the envelope detection means for each band, and an envelope stored in the first storage means A register 5-1-3 as second storage means for shifting and holding the value in time series, the previous envelope value shifted in time series held in the second storage means, and the first A difference circuit 5-1-1 as a calculation means for calculating the difference value of the current envelope value held in the storage means, and a plurality of display patterns An image pattern memory 13 as an image memory, a display unit 14 as a display means for displaying a display pattern read from the image memory, and a display pattern generated from the image memory in accordance with a difference value calculated by the calculation means Display unit control means 12 as an image memory control means for changing the image, so that the feature of the music can be recognized from the difference value of the envelope value, and the change of music is animated by moving the picture according to the recognized music Can be displayed, and the user can strongly appeal to the user about the lively feeling of music.
[0039]
Thereby, the effect of the demonstration at a shop front can be improved. In addition, since the hardware configuration is the same as before and can be realized by improving the software, there is an advantage that there is no cost increase. In this manner, the added value of the playback device applied to the display device of this embodiment can be improved.
[0040]
In the above-described display device according to the present embodiment, the specific tempo is detected from the difference value, and the pattern displayed on the display unit 14 as the display unit is switched according to the specific tempo. With strong music, it is possible to display animations of intense movement, and conversely, music with gentle flow can display animations of soft movement.
[0041]
Further, in the display device of the present embodiment, since the pattern displayed on the display unit 14 as the display unit is repeatedly displayed at a predetermined cycle in the above description, the display is performed according to the tempo cycle that appears continuously in the music. By repeating the animation pattern, the music feature can be expressed by repeating the animation.
[0042]
Further, in the display device of the present embodiment, 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 in the above, so the mask setting time is compared when the difference value is large. By setting the target length longer, it is possible to express the movement of dynamic animation with a large impact such as stop motion. Conversely, by setting the mask setting time relatively short when the difference value is small, Can express gentle and smooth animation movements.
[0043]
Further, in the display device according to the present embodiment, in the above description, the display unit 14 as the display unit can select the pattern display and the spectrum display according to the sound range. In addition, a conventional spectrum analyzer display can be selectively performed.
[0044]
【The invention's effect】
The display device according to the present invention includes a band dividing unit that divides an input audio signal into a plurality of bands, an envelope detecting unit that detects an envelope value in each band divided by the band dividing unit, and the envelope detecting unit. First storage means for holding the envelope value detected in each band, second storage means for shifting and holding the envelope value stored in the first storage means in time series, Calculating means for calculating a difference value between a previous envelope value held in the second storage means and shifted in time series and a current envelope value held in the first storage means; An image memory storing a display pattern, display means for displaying a display pattern read from the image memory, and a difference calculated by the calculation means Image memory control means for changing the display pattern generated from the image memory in response to the above, so that the music feature can be recognized from the difference value of the envelope value, and the music is moved by moving the picture according to the recognized music. Changes can be displayed in an animation, and the effect of being able to appeal to the user the vigorous feeling of music can be achieved.
[0045]
In the display device of the present invention, the specific tempo is detected from the difference value and the pattern displayed on the display means is switched according to the specific tempo. It is possible to display an animation of intense movement, and conversely, it is possible to display an effect of displaying an animation of soft movement in music with a slow flow.
[0046]
In the display device of the present invention, since the pattern displayed on the display means is repeatedly displayed at a predetermined cycle in the above description, the animation pattern displayed at the tempo cycle that appears continuously in the music is displayed. By repeating, it is possible to produce an effect that the feature of music can be expressed by repetition of animation.
[0047]
The display device of the present invention provides a mask setting time between the previous time and the current time depending on whether the difference value is larger or smaller than a predetermined value. By setting it relatively long, it is possible to express dynamic animation with a large impact such as stop motion, and conversely, by setting the mask setting time relatively short when the difference value is small It is possible to produce an effect that the movement of a gentle and smooth animation can be expressed.
[0048]
Further, in the above-described display device, the display device can select the case where the pattern is displayed on the display unit and the case where the spectrum is displayed according to the sound range. It is possible to produce an effect that the spectrum analyzer can be displayed.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating a configuration of a display device of an embodiment mode.
FIG. 2 is a flowchart showing the operation of the display device of the present embodiment.
FIG. 3 is a diagram showing a display example of the display device of the present embodiment.
FIG. 4 is an external perspective view of a playback device applied to the display device of the present embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Playback apparatus, 2 ... BPF, 3 ... Envelope detection circuit, 4 ... A / D conversion circuit, 5 ... Arithmetic circuit, 6 ... CPU, 7 ... Sparener / animation selection key, 8 ... Tone selection key, 9 ... Random selection Key 10 tempo measurement key 11 rhythm superposition 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 selection 18 ... Rhythm generator, 19 ... DSP for sound source, 20 ... Speech synthesizer, 21 ... Switch (SW1), 22 ... Switch (SW2), 23 ... Speaker, 30 ... Pattern, 31 ... Pattern, 32 ... Pattern, 40 ... CD / MD deck operation unit, 41 ... tuner operation unit, 42 ... amplifier operation unit, 43 ... speaker, 44 ... speaker, 45 ... display unit, 4 ... key

Claims (2)

Band dividing means for dividing an input audio signal into a plurality of bands;
Envelope detecting means for detecting an envelope value in each band divided by the band dividing means;
First storage means for holding the envelope value detected by the envelope detection means for each band;
Second storage means for shifting and holding the envelope value stored in the first storage means in time series for each band;
Computing means for computing the 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 for each band. When,
An image memory storing a plurality of display patterns;
Display means for displaying a display pattern read from the image memory;
Image memory control for setting a mask setting time that changes according to the magnitude of the difference value of any band calculated by the calculation means, and for changing a display pattern generated from the image memory when the mask setting time elapses Means,
A display device comprising: The display device according to claim 1,
A display device characterized in that the display means can select between displaying a pattern and displaying a spectrum in accordance with a sound range.

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