JPH11225031A - Audio signal processing device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide an audio signal processing device capable of effectively displaying display information on an audio signal. SOLUTION: A special effect processing device section 12 divides an audio signal from a digital audio interface 16 into an audio signal for each predetermined frequency band,
The sound pressure level of the audio signal in each frequency band is obtained. By converting the sound pressure level in this frequency band into information on display density, color density or hue, a special effect is given and displayed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an audio signal processing device for processing an audio signal, such as an audio signal recording / reproducing device.

[0002]

2. Description of the Related Art For example, in an audio signal recording / reproducing apparatus such as a tape recorder, when determining the volume of a sound to be emitted or when adjusting the level of a sound to be recorded, the determination and adjustment of the sound are performed. For the purpose of being used as an index, the sound pressure level of an audio signal is displayed on a display device provided in a recording / reproducing device or the like.

For example, in the case of a stereo audio signal, the sound pressure levels of the left channel and the right channel are detected, and are converted into digital signals of 1 and 0 by an analog / digital converter (hereinafter, referred to as A / D converter). The sound pressure level is output to a display device according to the magnitude of the sound pressure.

[0004] Further, it is also practiced to divide an audio signal into frequency bands, such as a graphic equalizer, and to display a sound pressure level of the audio signal in each frequency band. In this method, an audio signal is divided into predetermined frequency bands using a filter or the like, and the sound pressure levels of the audio signals in the respective frequency bands are displayed.

[0005] As the display device, for example, an LED (light emitting diode) or an LCD (liquid crystal display) is used, and for example, the number of LEDs to emit light is changed according to the sound pressure level. For example, the sound pressure level is displayed in a bar graph on the LCD.

[0006]

Recently, a display device which can be mounted on an electronic device such as an audio signal recording / reproducing device can use a full dot display or a GUI (graphical user interface). The progress has been remarkable, for example, the display has been colorized, and it has been mounted on all electronic devices, and has begun to be used for displaying various information such as guide messages.

As described above, in spite of the functions and display capabilities of the display device being improved, the manner of displaying the display information on the audio signal such as the sound pressure level in the recording / reproducing device of the audio signal or the like still remains. I'm still there. Audio signals are what you hear and not what you see. But,
In the age of multimedia, it has become important how to enjoy sound provided by an audio signal recording / reproducing device and the like, particularly music, and how to enjoy mentally.

For this reason, there is a demand that the display of the display information relating to the audio signal be displayed not only as an index of the adjustment of the audio signal at the time of reproduction or recording, but also in a manner that is attractive to the user. Is getting bigger.

For example, at the time of reproducing an audio signal, it is possible not only to provide the audio obtained by simply reproducing the audio signal, but also to provide the user with more enjoyable and satisfactory audio. Is required.

In view of the above, an object of the present invention is to provide an audio signal processing device capable of effectively displaying display information on an audio signal.

[0011]

According to a first aspect of the present invention, there is provided an audio signal processing apparatus, comprising: a display information generating unit configured to generate display information on an audio signal; And a special effect imparting means for imparting a special effect to the display information of the audio signal generated by the above and displaying the information.

According to the first aspect of the present invention, the display information generating means generates display information on an audio signal such as a sound pressure level. The display information on the audio signal is displayed in a new mode after the special effect is given by the special effect giving means.

Thus, the display information on the audio signal can be displayed not only as an index for adjustment at the time of reproduction or recording of the audio signal but also as information to be enjoyed.

According to a second aspect of the present invention, there is provided the audio signal processing apparatus according to the first aspect, wherein the display information generating means changes or changes in real time. The special effect applying means changes the sound pressure level for the frequency to information indicating a display density, a color density, or a hue, thereby generating a special effect. It is characterized by giving.

According to the audio signal processing device of the present invention, the display information on the audio signal generated by the display information generating means is the sound pressure level with respect to the frequency. The special effect is given by converting the sound pressure level for this frequency into information indicating display density, color density, or hue by the special effect applying means.

Thus, the sound pressure level with respect to the frequency is displayed according to the difference in display density, color density, and hue,
The sound pressure level can be displayed in a visually enjoyable manner.

According to a third aspect of the present invention, there is provided the audio signal processing apparatus according to the first aspect, wherein the display information generating means changes or changes in real time. The special effect imparting means generates the sound pressure level with respect to the frequency, by changing the sound pressure level with respect to the frequency to information that changes in an arbitrary direction, or radially, or a combined direction of both. A special effect is provided.

According to the third aspect of the present invention, the display information on the audio signal generated by the display information generating means is a sound pressure level corresponding to a frequency, and a sound pressure level corresponding to the frequency. Is converted into information that changes in an arbitrary direction, radially, or a combined direction of the two by a special effect applying unit, thereby applying a special effect.

Thus, the sound pressure level with respect to the frequency is displayed so as to be changed in an arbitrary direction, radially, or in a combined direction of both, so that the sound pressure level with respect to the frequency is displayed in a visually enjoyable manner. Will be able to.

According to a fourth aspect of the present invention, there is provided the audio signal processing apparatus according to the first aspect, wherein the display information generating means changes or changes in real time. Wherein the special effect applying means applies the special effect by changing the frequency corresponding to the sound pressure level to a distance from a predetermined origin. .

According to the audio signal processing device of the present invention, the display information on the audio signal generated by the display information generating means is the sound pressure level with respect to the frequency. The special effect is given by converting the frequency to a predetermined distance from the origin by the special effect giving means.

Thus, the sound pressure level for the frequency of the audio signal can be displayed at a different position from a predetermined origin, and the sound pressure level for each frequency can be displayed in a visually enjoyable manner. Will be able to.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to the drawings, taking as an example a case where the present invention is applied to a mini disc recording / reproducing apparatus (hereinafter simply referred to as a recording / reproducing apparatus). First, before describing the present invention, a recording / reproducing apparatus to which the present invention is applied will be described.

[Description of Configuration of Recording / Reproducing Apparatus] FIG. 1 shows a configuration of a recording / reproducing apparatus of a minidisc to which the present invention is applied. In FIG. 1, reference numeral 1 denotes a mini disk. The mini disk 1 has a diameter of 64 m in the cartridge 2.
m of disks 3 are housed. The mini-disc 1 includes three types: a read-only optical disc, a recordable magneto-optical disc, and a hybrid disc having both a read-only area and a recordable area.

Further, a pre-groove for light spot control (for tracking control) is formed (pre-pit) on the disk 3 in advance. In particular, in the case of this example, the pre-groove for tracking is formed on the pre-groove. Absolute address data is recorded superimposed on the wobbling signal.

The disk 3 of the mini disk 1 is rotated by a spindle motor 4. The rotation of the spindle motor 4 is controlled by a servo circuit 7 so that the disk 3 rotates at a constant linear velocity. The mini disk 1 is provided with a shutter.
When is mounted, the shutter is opened. In the case of a recordable optical disk, a magnetic head 5 for recording is arranged above the disk 3 so as to oppose it, and an optical head 6 is arranged below the disk 3 so as to oppose it. In the case of a read-only optical disk, an optical head 6
Are arranged facing each other.

The movement of the optical head 6 in the radial direction of the disk 3 is controlled by the sled 8. Also, the servo circuit 7
Thereby, focus and tracking control of the optical head 6 are performed.

The system controller 9 is equipped with a microcomputer and manages the entire operation. This system controller 9 includes a key group 1
Input is provided from 0. The key group 10 includes a power key, an eject key, a play key, a pause key, a stop key, a music selection key, a recording key, and the like.

A display 11 is connected to the system controller 9. The display 11 displays time information such as the total playing time of the mounted mini-disc, the elapsed time of the currently playing song, the remaining playing time of the currently playing song, the remaining remaining playing time, and the track of the currently playing song. The number etc. are displayed. For a disc on which a disc name or track name is recorded, the disc name or track name is displayed. Further, if the recording date and time of the music or the disc is recorded, the recording date and time are displayed. Further, in this embodiment, the display 11 has a special effect processing unit 12 as described in detail later.
The display information about the processed audio signal is displayed.

The configuration of the recording / reproducing signal system of the embodiment shown in FIG.
It is devised to simplify the configuration as much as possible by using an IC. The mode of each unit is switched between a recording mode and a reproducing mode by a mode switching signal from the system controller 9.

[Explanation of Recording System] As shown in FIG. 1, the recording / reproducing apparatus for a mini-disc according to this embodiment has a digital audio signal input terminal (hereinafter referred to as a digital input terminal) 13 and an analog audio signal input terminal. And an input terminal (hereinafter, referred to as an analog input terminal) 14. The digital input terminal 13 and the analog input terminal 14 are one-channel for simplicity in FIG. 1, but are actually two-channel stereo.

The digital audio signal input through the digital input terminal 13 is supplied to a digital audio interface 16. The digital audio interface 16 includes an A / D converter and a D / A converter, and also performs processes such as separating information other than the audio signal from the digital audio signal input through the digital input terminal 13.

That is, in the digital audio signal input through the digital input terminal 13, audio data and other information are separated by the digital audio interface 16. Then, the separated digital audio data is supplied to the audio compression encoding / decoding circuit 17. Information other than the audio data includes Cbit and Ubit, which are read by the system controller 9 and the category and the like are read from the Cbit.
The music number, time information, and the like are read from Ubit, and the information is displayed on the display 11, for example.

When an analog audio signal is input through the analog input terminal 14, the input analog audio signal is converted by an A / D converter in the digital audio interface 16 into a sampling frequency of 44.1 kHz and a quantization bit rate. Digitized in several 16 bits, voice compression encode / decode circuit 1
7 is supplied.

Audio compression encoding / decoding circuit 17
Compresses the digital audio signal from the digital audio interface 16 to about 1/5. In this case, as a compression technique of the audio signal, for example, a modified D
CT (Modified Discreate Cosine Transform) is used.

The audio signal compressed by the audio compression encoding / decoding circuit 17 is supplied to a memory controller 18.
Is once stored in the RAM 19 controlled by the memory controller 18. The RAM 19 has a data capacity of one or more clusters (1 M bits in this example). The output of this RAM 19 is EFM and CIR
It is supplied to the C encoder / decoder 20.

The memory controller 18 sequentially reads out and reads out the compressed data from the RAM 19 at a transfer speed of about five times the write speed, unless a track jump in which the recording position on the disk 3 jumps due to vibration or the like during the recording. Data is encoded / encoded by EFM and CIRC /
The data is transferred to the decoding circuit 20.

When it is detected that a track jump has occurred during recording, the memory controller 18 determines whether or not the track jump has occurred.
The data transfer to the FM / CIRC encoding / decoding circuit 20 is stopped, and the compressed data from the audio compression encoding / decoding circuit 17 is stored in the RAM 19. When the recording position is corrected, the EFM is read from the RAM 19.
And control to restart data transfer to the CIRC encoding / decoding circuit 20.

Detection of whether or not a track jump has occurred can be performed, for example, by providing a vibrometer in the apparatus and detecting whether or not the magnitude of the vibration is such as to cause a track jump. Further, as described above, since the absolute address data is recorded in the pregroove on the disk 3 of this example, the absolute address data can be read at the time of recording, and a track jump can be detected from the decoded output. Alternatively, a track jump may be detected by taking the OR of the absolute address data with the vibrometer. When a track jump occurs, the power of the laser beam for magneto-optical recording is reduced or the power is set to zero.

The correction of the recording position when a track jump occurs can be performed using the above-mentioned absolute address data. Further, as understood from the above, the data capacity of the RAM 19 in this case is a capacity capable of accumulating compressed data corresponding to the time from the occurrence of a track jump to the correct correction of the recording position. is necessary. In this example, the capacity of the buffer memory 35 is, for example, 1 Mbit, and this capacity is selected as having a margin so as to sufficiently satisfy the above conditions.

In this case, the memory controller 18
In this recording, during normal operation, R
Memory control is performed so that data stored in the AM 19 is reduced. That is, when the data amount of the RAM 19 becomes equal to or more than a predetermined amount, only a predetermined amount of data, for example, data of 32 sectors (one sector is 1 CD-ROM sector (about 2 Kbytes)) is read from the RAM 19. The memory control is performed such that a write space larger than a predetermined data amount is always secured.

The EFM / CIRC encoding / decoding circuit 20 performs error correction processing of recording data and performs EFM (8-14 modulation) on which error correction encoding has been performed. As an error correction code, CIRC (Cross Inte
rleave Reed Solomon Code) is used.

The recording data thus formed is:
It is supplied to the recording magnetic head 5 via the magnetic head drive unit 21. As a result, a magnetic field modulated by the recording data is applied to the disk 3 (magneto-optical disk) of the mini disk 1. In addition, the laser beam from the optical head 6 is applied to the disk 3 of the mini disk 1. Thus, data is magneto-optically recorded on the disk 3 of the mini disk 1.

The recording of data is performed in cluster units. One cluster is composed of 36 sectors and one sector (corresponding to one subcode block of a compact disc).
Is a 5.5 sound group. 32 sectors in one actual cluster are valid data. The remaining four sectors are used as a linking area for adjusting the timing of the rise of the magnetic field of the magnetic head at the start of recording and the control of the laser power.

The magnetic head 5 and the optical head 6 are
They are configured to be able to move in the radial direction of the disk 3 in synchronization with each other.

At the time of this recording, the optical head 6
Output from the address decoder 22 via the RF amplifier 23.
, And the absolute address data recorded in the pre-groove provided along the track of the disk 3 is extracted and decoded. Then, the detected absolute address data is supplied to the EFM and CIRC encoding / decoding circuit 20, inserted into the recording data, and recorded on the disk 1. Further, the absolute address data is supplied to the system controller 9 and used for recognition of the recording position and position control.

A signal from the RF amplifier 23 is supplied to the servo control circuit 5, and a control signal for constant linear velocity servo of the spindle motor 4 is formed from a signal from the pre-groove of the disk 3, and the spindle motor 4 Speed controlled.

[Explanation of Reproduction System] Next, the reproduction time will be described. In other words, at the time of this reproduction, the spindle motor 4 is controlled by the servo circuit 7 by the signal from the pre-groove at the same linear speed as at the time of recording by the servo circuit 7 in the same manner as at the time of recording.

At the time of reproduction, the optical head 6 detects a focus error by, for example, an astigmatism method by detecting a reflected light of the laser beam applied to the target track.
For example, a tracking error is detected by a push-pull method, a difference in the polarization angle (Kerr rotation angle) of the reflected light from the target track is detected, and a reproduction RF signal is output.

The output of the optical head 6 is supplied to an RF amplifier 23. The RF amplifier 23 extracts a focus error signal and a tracking error signal from the output of the optical head 6 and supplies the focus error signal and the tracking error signal to the servo circuit 7.
Supply 0.

The servo circuit 7 performs focus control of the optical system of the optical head 6 so that the focus error signal becomes zero, and performs tracking of the optical system of the optical head 6 so that the tracking error signal becomes zero. Perform control.

The output of the RF amplifier 23 is supplied to the address decoder 22, and extracts and decodes absolute address data from the pregroove. Then, the absolute address data from the decoder 22 is supplied to the system controller 9 via the circuit 20, and is used for controlling the reproduction position of the optical head 6 in the disk radial direction by the servo circuit 7. The system controller 9 also outputs address information in sector units extracted from the reproduction data.
It can be used to manage the position on the recording track where the optical head 6 is scanning.

At the time of this reproduction, as will be described later,
The compressed data read from the disk 3 is written to the RAM 19 and read and decompressed. However, due to the difference in transmission rate between the two data, the data read from the disk 3 by the optical head 6 is performed by, for example, reading the data stored in the RAM 19. It is performed intermittently so as not to fall below a predetermined amount.

In the EFM and CIRC encoding / decoding circuit 20, the signal supplied via the RF amplifier 23 is EFM-demodulated and subjected to processing such as error correction. E
The output of the FM and CIRC encoding / decoding circuit 20 is temporarily stored in the RAM 19 via the memory controller 18.

The memory controller 18 transfers the compressed data from the circuit 20 to the memory at approximately 1/5 of the writing speed unless a track jump that causes the reproduction position to jump during reproduction is caused. The data is sequentially read at a speed, and the read data is transferred to the audio compression encoding / decoding circuit 17. In this case, the memory controller 18 determines that the amount of data stored in the RAM 19 is
The writing / reading of the RAM 19 is controlled so as not to fall below a predetermined value.

When it is detected that a track jump has occurred during reproduction, writing of data from the circuit 20 to the RAM 19 is stopped, and only data transfer to the circuit 17 is performed. When the playback position is corrected, the circuit 2
Control is performed to restart data writing from 0 to the RAM 19.

As described above, during normal operation, the memory controller 18 controls the memory so that the RAM 19 stores as much predetermined data as necessary. For example, when the amount of data in the RAM 19 becomes equal to or less than a predetermined amount, the optical head 6 intermittently takes in data from the disk 3 and performs a circuit 2 operation.
Data writing from 0 is performed, and memory control is performed so that a read space of a predetermined data amount or more is always secured.

The time required to read data into the RAM 19 completely is about 0.9 seconds, and this data corresponds to about 3 seconds of audio data. That is, RAM
Even if the signal on the disk 3 cannot be read when the data is fully stored in the data 19, it is possible to continue outputting the reproduction signal for about 3 seconds. In the meantime, the optical head 6 is re-accessed to the original position and the signal is read again, thereby preventing the occurrence of the sound skip.

The data decompressed by the audio compression encoding / decoding circuit 17 is supplied to a D / A converter in the digital audio interface 16 and returned to an analog signal. This analog signal is output from the analog audio signal output terminal 15.

At the innermost periphery of the disk 3 of the mini disk 1, a TOC (Table Of Contents) is provided.
The TOC describes a start address and an end address of each song on the disc, a track name as a song name, a disc name as a disc name, and the like.

Further, in the mini-disc 1, a UTOC (user TOC) is provided on a recordable disc in order to manage recorded audio signals. UT
The OC includes sector 0, sector 1, and sector 2.

FIG. 2 shows the structure of sector 0.
In the sector 0, the recording status of the disk 1 is written.
In P-TNO1, a pointer on sector 0, which contains the address where the first music piece starts, is written. That is,
If 1 is entered in P-TNO1, (76+
Start address and end address are written starting from 1 * 2) * 4 bytes. The same applies to P-TNO2 and thereafter.

FIG. 3 shows the structure of the sector 1.
Sector 1 contains information on disk name and track name. The information is an ASCII code. P-TN
A1 describes the start address on sector 1 containing the track name of the first music piece. That is, P-TNA1
Is 2, the (76 + 2 * 2) * 4 bytes of sector 1 have the head of the track name of the first song. P-TNA
The same applies to the second and subsequent ones. Disk name is 76 of sector 1
* Contains 4 bytes at the beginning.

FIG. 4 shows the structure of the sector 2.
Sector 2 is a sector for recording the date and time of recording. In a compatible minidisk storage / playback device, data is usually automatically recorded at the same time as recording. In P-TRD1, the start address on sector 2 containing the date and time when the first music piece was recorded is written. In other words, if P-TRD1 is 3, the (76 + 3 * 2) * 4 bytes of sector 2 start,
The recording date and time of the first song are written. The same applies to P-TRD2 and thereafter. The recording date and time of the disc is 76 * 4 of sector 2.
Contains bytes first.

Information of each track of the sector 0 and the sector 1 of the UTOC includes information called Link-P. The Link-P indicates where the song is connected next in the sector 0, and indicates where the song name is connected next in the sector 1.
Therefore, it is possible to easily cope with erasing a tune, combining two tunes, or increasing the number of characters of a track name later.

The TOC information and UTOC information are stored in a part of the RAM 19 when the disc is mounted. The operation for changing the UTOC is performed when recording, editing, or inputting a disc name or a song name.

[Explanation of the Main Part of the Present Invention] In the recording / reproducing apparatus of this embodiment, a digital audio interface 16 also supplies an audio signal to the special effect processing unit 12. The special effect processing unit 12
Based on the supplied audio signal, data for displaying display information about the audio signal is formed, and the data is supplied to the system controller 9. The system controller 9 displays on the display 11 display information on the audio signal to be output based on the display data from the special effect processing device 12.

In the mini disc recording / reproducing apparatus according to this embodiment, the special effect processing unit 12 represents the sound pressure level, which is display information on the reproduced audio signal, by display density or color density. For example, a special effect is given to the display information about the audio signal by radially displaying the information, and the display information about the audio signal is displayed more dynamically.

FIG. 5 is a block diagram for explaining the special effect processing unit 12 of the recording / reproducing apparatus shown in FIG. As shown in FIG. 5, the special effect processing device unit 12 of this embodiment includes an audio signal input processing unit 24, a frequency division processing unit 25, a sound pressure to frequency coordinate conversion unit 26, and a display data output unit 27. And

At the time of reproduction, the digital audio interface 16 of the recording / reproducing apparatus of this embodiment supplies an audio signal to the special effect processing device 12.
At this time, the type of the analog signal or the digital signal does not matter.
The audio signal from the digital audio interface 16 is sent to the audio signal input processor 2 of the special effect processor 12.
The special effect processing unit 12 forms an audio signal in a format to be processed by the special effect processing unit 12, and supplies it to the frequency division processing unit 25.

The frequency division processing unit 25 includes a filter and an F
It is constituted by an FT (Fast Fourier Transform) circuit or the like, and divides a supplied audio signal into audio signals of several predetermined frequency bands. These divided audio signals in the respective frequency bands are supplied to the sound pressure-to-frequency coordinate converter 26.

The sound pressure-to-frequency coordinate conversion unit 26 includes a display information conversion unit 28 and a random coordinate generation unit 29. Display data representing the relationship between sound pressure and frequency, which are display information on an audio signal, on coordinates. Create In the special effect processing device unit 12 of this embodiment, the display information conversion unit of the sound pressure versus frequency coordinate conversion unit 26 calculates the sound pressure level for each frequency band divided by the frequency division processing unit 25 as the display density f, Alternatively, each frequency band is converted into data of a distance h from the origin, for example, with a predetermined position on the display 11 as the origin.

Next, the display density f with respect to the distance h is calculated by the random coordinate converter 29 of the sound pressure-to-frequency coordinate converter 26.
Alternatively, to display the color density g randomly, the display density f
The coordinate data in the vicinity of the distance h is generated by a number proportional to or dependent on the color density g and supplied to the display data output unit 27 in FIG.

The display data output section 27 supplies the coordinate data from the sound pressure to frequency coordinate conversion section 26 and other information relating to the display to the system controller 9. The system controller 9 displays on the display 11 display information on the audio signal to be reproduced and output based on the information from the display data output unit 27 of the special effect processing device unit 12.

In the recording apparatus of this embodiment, FIG.
In the display unit 11 shown in FIG.
2, the audio signal is separated into signals in a predetermined frequency band, and the sound pressure level data of the separated audio signal in each frequency band is represented by a display density or a color density. For example, the display 11
By using the data expressed by the distance from the predetermined origin, the display information about the audio signal is more dynamically, randomly, unexpectedly interesting, and related to the audio signal being output. Can be represented on the display 11.

FIGS. 6 and 7 are diagrams for explaining examples of displaying display information on audio signals displayed on the display 11 in the recording / reproducing apparatus for a mini-disc according to the present embodiment.

FIG. 6 shows that, as described above, the audio signal supplied from the digital audio interface 16 is divided into audio signals for each predetermined frequency band, and the sound pressure level of the audio signal in each of the divided frequency bands. Is represented by the display density.

In this case, the sound pressure level of each frequency band is
The frequency band is represented by a display density f, and each frequency band is a distance h radially changing from a predetermined origin (center).
It is represented by Then, a plurality of pieces of coordinate data corresponding to the display density f and the distance h are generated, and a display corresponding to the coordinate data is performed. In this case, as shown in FIG. 6, near the distance h from the origin corresponding to each frequency band, display information (black circles in FIG. 6) is displayed at a display density corresponding to the sound pressure level of the frequency band. Is displayed.

The audio signal changes every moment.
In accordance with the changing audio signal, display information about the audio signal is displayed on the display 11 in a manner as shown in FIG.

FIG. 7 shows that, as described above, the audio signal supplied from the digital audio interface 16 is divided into audio signals for each predetermined frequency band, and the sound pressure level of the audio signal in each of the divided frequency bands. Is represented by a color density, and the sound pressure level is also represented by a distance radially changing from a predetermined origin.

In this case, each frequency band is represented by a distance from a predetermined origin (center). In this embodiment, for example, the frequency band is increased in a direction away from the origin (center). Therefore, the lowest frequency band has a frequency band centered on the origin, such as a distance a in the radial direction around the origin and a distance from the distance a to a distance b in the radial direction centered on the origin. A display area is provided. Then, the display of the color density according to the sound pressure level in the display area of each frequency band is performed. At the same time, in FIG. 7, in the display information displayed in a circular shape, a figure formed according to the information in which the sound pressure level is also represented by a distance radially changing from a predetermined origin is also displayed. Have been to be.

As a result, as shown in FIG. 7, the display area of the frequency band having a low sound pressure level has a low density of the displayed color, and the display area of the frequency band having a high sound pressure level has a low display area. The display information about the audio signal can be displayed by increasing the density, and the graphic formed based on the distance information radially changing from the origin according to the sound pressure level is also displayed at the same time. be able to. In addition, the information about the audio signal can be changed and displayed on the display 11 according to the audio signal that changes every moment.

For example, the lower the sound pressure is, the bluer and the density are sparse, and the higher the sound pressure is, the more red and the density are expressed. The lower the sound pressure is, the bluer and the color density is. In addition, by taking into account the color tone (hue), such as increasing the sound pressure at a higher level and reddening the color density, the information on the reproduced audio signal can be more dynamically and in real time converted to music like an aurora. It is possible to display information on the reproduced audio signal so as to change in accordance therewith.

Also, by displaying each frequency band with a distance h1 that changes radially from a predetermined origin (center), display information on a sound signal that changes more can be displayed. .

Next, the processing in the special effect processing unit 12 of the recording / reproducing apparatus of this embodiment for giving a special effect to the display information of the audio signal as described above and displaying the same will be described with reference to FIGS. This will be described with reference to the flowchart of FIG.

FIG. 8 is a block diagram for explaining the processing performed in the special effect processing unit 12 shown in FIG. 1. FIG. 9 is a diagram showing the sound pressure-to-frequency coordinate conversion processing of the special effect processing unit 12. 6 is a flowchart for explaining processing of a unit 26.

As shown in FIG. 8, when an audio signal is supplied from the digital audio interface 16 to the special effect processor 12, the audio signal is received by the audio signal input processor 24 (step 101). The signal is supplied to the frequency division processing unit 25. Frequency division processing unit 2
5 divides the audio signal from the audio signal input processing unit 24 into audio signals of a predetermined frequency band as described above, and supplies the divided audio signals of each frequency band to the sound pressure-to-frequency coordinate conversion unit 26 (Step 102).

The sound pressure-to-frequency coordinate conversion unit 26 creates display data expressing the relationship between sound pressure and frequency, which is display information on the audio signal, on coordinates, and supplies this to the display data output unit 27 ( Step 103). The display data output unit 27 supplies the display data from the sound pressure to frequency coordinate conversion unit 26 to the system controller 9 (Step 10).
4).

In this case, the sound pressure-to-frequency coordinate converter 26
Converts the sound pressure level of the audio signal of each frequency band into a display density f or a color density g, and also converts each frequency band from a predetermined origin h as shown in FIG.
(Step 201). Then, the sound pressure-to-frequency coordinate converter 26 randomly displays the display density f or the color density g with respect to the distance h (frequency band), for example, by using a function R that is set in advance. The coordinate data in the vicinity of the distance h is generated by a number proportional to or dependent on f or the color density g (step 20).
2) This is supplied to the system controller 9 through the display data output unit 27.

In this way, the system controller 9 displays information on the audio signal on the display 11 based on the information from the special effect processing unit 12 in response to the output audio signal. In this case, the display information about the audio signal displayed on the display 11 is visually interesting enough, and the user can enjoy the sound of the output audio signal more. The display information about the audio signal displayed on the display 11 indicates the sound pressure level of each frequency band of the output audio signal as described above, and is used as an index for adjusting the sound quality of the reproduced audio. It can also be used.

In this embodiment, the information on the audio signal to be reproduced is displayed based on the data processed in the special effect processing unit 12.
At the time of recording, information relating to the audio signal to be recorded can be processed and displayed in the special effect processing unit 12 in the same manner.

In the case of a stereo audio signal, display information about the audio signal can be displayed for each of the left and right audio signals as described above. Further, the present invention is not limited to the display of the sound pressure level of each frequency band of the audio signal, and the sound pressure level of the audio signal may be displayed by display density, color density, color tone, or the like. .

Further, based on the instruction input by the user,
It is possible to change whether the sound pressure level is expressed by the display density, the color density, the color tone, or the combination thereof. That is, based on the instruction input from the user,
The system controller 9 can specify to the special effect processing device unit 12 a method of changing the display information of the audio signal.

In the above-described embodiment, the audio signal processing apparatus according to the present invention has been described as applied to a recording / reproducing apparatus for a mini-disc. However, the present invention is not limited to this. For example, the present invention can be applied to a recording-only device and a reproduction-only device for a mini-disc.

Further, the present invention can be applied to all media that handle audio signals, such as a CD (compact disk) reproducing device, a tape recorder, a game machine, and an electronic musical instrument. The audio signal may be an analog signal or a digital signal.

Further, since the display corresponding to the sound pressure level can be performed for each frequency band of the audio signal, the display can be used as a spectrum analyzer. Further, various modifications such as using the display of the display information on the audio signal as a tool for relaxing the feeling are also conceivable.

[0097]

As described above, according to the audio signal processing device of the first aspect of the present invention, the display information on the audio signal is converted into the audio information by adding the special effect to the display information on the audio signal. Not only can it be used as an index for adjustment during signal reproduction or recording, but can also be displayed as information that can be enjoyed.

Further, according to the audio signal processing apparatus of the present invention, the sound pressure level with respect to the frequency as the display information on the audio signal is displayed by the difference of the display density, the color density, and the hue. The pressure level can be displayed in a visually enjoyable manner.

Further, according to the audio signal processing apparatus of the third aspect, the sound pressure level with respect to the frequency as the display information of the audio signal is adjusted in an arbitrary direction, radially, or a decoding direction of both. It can be displayed as changing. As a result, the sound pressure level with respect to the frequency can be displayed in a visually enjoyable manner.

Further, according to the audio signal processing apparatus of the present invention, it is possible to display the sound pressure level with respect to the frequency as the display information on the audio signal at a position different from a predetermined origin. . Thus, the sound pressure level for each frequency can be displayed in a visually enjoyable manner.

[Brief description of the drawings]

FIG. 1 is a block diagram for explaining an embodiment of a recording / reproducing apparatus for a mini disc to which an audio signal special effect device according to the present invention is applied.

FIG. 2 is a diagram for explaining sector 0 of the UTOC of the minidisk.

FIG. 3 is a diagram for explaining sector 1 of the UTOC of the minidisk.

FIG. 4 is a diagram for explaining sector 2 of the UTOC of the minidisk.

FIG. 5 is a block diagram for explaining a special effect processing unit shown in FIG. 1;

FIG. 6 is a diagram illustrating an example of a display mode when data generated by a special effect processing device is output to a display unit.

FIG. 7 is a diagram for explaining another example of a display mode when data generated by the special effect processing device unit is output to a display unit.

FIG. 8 is a flowchart for explaining processing in the special effect processing device shown in FIG. 5;

FIG. 9 is a flowchart illustrating a process performed by a sound pressure-to-frequency coordinate conversion processing unit illustrated in FIG. 5;

[Explanation of symbols]

1 ... mini disk, 2 ... cartridge, 3 ... disk,
4 spindle motor, 5 magnetic head, 6 optical head, 7 servo circuit, 8 thread section, 9 system controller, 10 key group, 11 display, 12
.. Special effect processing unit, 13 digital audio input terminal, 14 analog audio input terminal, 15 audio output terminal, 16 digital audio interface (A / D, D / A converter), 17 audio compression encoding / decoding Part, 18 ... memory controller,
19 RAM, 20 EFM and CIRC encoding / decoding circuit, 21 magnetic head drive unit, 22 address decoder, 23 RF amplifier, 24 audio signal input processing unit, 25 frequency division processing unit, 26 sound pressure Frequency coordinate conversion unit, 27: display data output unit, 28: display information conversion unit, 29: random coordinate generation unit

Claims (4)

[Claims] 1. A display information generating means for generating display information on an audio signal, and a special effect is given to the display information on the audio signal generated by the display information generating means for display. And a special effect applying means. 2. The display information generating means generates the display information based on a sound pressure level with respect to a frequency of an audio signal which changes or changes in real time. The audio signal processing device according to claim 1, wherein a special effect is provided by changing the sound pressure level to information indicating a display density, a color density, or a hue. 3. The display information generating means generates the display information based on a sound pressure level corresponding to a frequency of an audio signal which changes or changes in real time. 2. The audio signal processing device according to claim 1, wherein a special effect is provided by changing the sound pressure level to information that changes in an arbitrary direction, radially, or a composite direction of the two. 4. The display information generating means generates the display information based on a sound pressure level with respect to a frequency of an audio signal which changes or changes in real time. 2. The audio signal processing apparatus according to claim 1, wherein a special effect is provided by changing a frequency with respect to the level to a predetermined distance from the origin.