JPS6313092A - Voice signal processor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Hereinafter, the present invention will be explained in the following order.

A. Industrial field of application B0 Summary of the invention C0 Prior art 0 Problems to be solved by the invention E1 Means for solving the problems F5 Effects G. Implementation sequence G-1. First embodiment ( Figures 1 to 5) G-2, 2nd
Embodiment (Fig. 6) Effect A of toy invention, industrial application field The present invention relates to an audio signal processing device that performs processing such as filter processing on an audio signal, and is suitable for use in, for example, language learning. It is suitable.

B0 Summary of the Invention The present invention is an audio signal processing device that performs processing such as filter processing on an audio signal, for example, based on an audio signal reproduced from a recording medium such as an optical disk or a magnetic card. By generating a digital audio signal, converting it into an analog signal, and then outputting it through filter means whose filter mode can be switched, the learning effect of the bellbotnal method can be sufficiently obtained.

C6 Conventional technology Conventionally, Verbo-Tona method
lSystem) or Zagreb Language Education (Method)
There is a known foreign language education method called . This Verhotnaru method was originally developed for the rehabilitation of hearing-impaired children, but later it was found to be effective in correcting the pronunciation of foreign languages, and it has been studied and conducted in many countries.
It is being utilized.

When listening to a foreign language, we generally listen based on the phonological system of our native language, which is most convenient for our ears.

In order to correct this, the Belhotonal method is a method in which the conversational band (for example, 300H2 to 3000Hz) is deleted and the learner is given repeated listening practice. Through this practice, the learner avoids the temptation of the native language. This allows students to acquire the rhythm and intonation of a foreign language without being influenced by their native language. Also, after that,
Even if you listen to the entire frequency range, it has the effect of making it easier to hear and pronounce words unique to a foreign language.

D0 Problems to be Solved by the Invention As a learning device to which such a Verhotonal method is applied, for example, one that uses an endless tape to perform repeat playback necessary for learning has been known. However, endless tape has a long repeat time of about 60 seconds at the shortest, and it takes time and effort to create teaching materials to take advantage of the Verhotonal method of learning. Furthermore, teaching materials using endless tape are relatively expensive and uneconomical considering the information they can store, and are also inconvenient to store and organize.

Furthermore, although the device as a whole is expensive, it has poor performance, which gives the learner a feeling of fatigue and reduces learning efficiency.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an audio signal processing device which can eliminate the above-mentioned conventional problems and can sufficiently obtain the learning effect of the verhotonal method.

Means for Solving the E1 Problem In order to achieve the above-mentioned object, the audio signal processing device according to the present invention converts a sound signal reproduced from a recording medium into a sound signal, and then converts the sound signal into a plurality of filter modes having different pass characteristics. Among these filter modes, the -filter mode is output through a filter means selected by operating a changeover switch.

F0 Effect According to the present invention, a periodically repeating digital audio signal is converted into an analog signal and then outputted through a filter means whose filter mode can be selected.

G. EXAMPLES Hereinafter, examples of the present invention will be described in detail with reference to the drawings.

G-1, First Embodiment This first embodiment is applicable to the information selection and reproducing apparatus as disclosed in the specification and drawings of Japanese Patent Application No. 1987-40049, which was previously proposed by the applicant. This invention is an application of the present invention, and constitutes a learning device to which the Bellhotnal method is applied. Therefore, in this embodiment, only the main parts will be explained, and the explanation of other parts will be omitted. In FIG. 1, an optical disc 1, which is a recording medium, is a DAD (digital audio disc) used in connection with text (not shown), and is given a predetermined rotation by a disc rotation motor 2. In this disc 1,
For example, an array of a large number of pits is formed and recorded so that two channels of program information (for example, English and Japanese) and address data can be read out optically, and an optical head is used as the information reading means. Read by 3. The text used with the disc 1 is, for example, a text for learning English conversation, in which words and sentences in English and Japanese are written, and
It has a page on which a plurality of barcodes are arranged in relation to it. The barcode is read by a barcode reading section 27, which will be described later.

The optical head 3 irradiates the disk 1 with a light beam such as a laser beam, and generates a read signal S by receiving the reflected light beam modulated according to the recording track of the disk 1 with a photodetector. Therefore, the point at which the light beam from the optical head 3 reaches on the disk 1 becomes the reading position on the disk 1 by the optical head 3. The read signal S from the optical head 3 is supplied to the read signal processing section 4, and the program information and address data focus error signal Sf are supplied from the read signal processing section 4 to the focus control drive section 5. Based on this, the focus A drive signal CX is supplied from the control drive unit 5 to the optical head 3 to perform focus servo. Further, the tracking error signal St is supplied to the reading position control section 6, and based on this, the tracking error signal St is supplied to the reading position control section 6.
A drive signal Cy is supplied from the optical head 3 to the optical head 3 to perform tracking servo.

Furthermore, the signal Sp from the read signal processing section 4 is supplied to the decoder 7, from which the reproduction program information P is obtained and the reproduction address data Q is detected. The playback program information P is supplied to the program information processing section 8, and the playback digital program information signal Pa, which is a digital audio signal, is obtained from the program information processing section 8. supplied to

Based on the reproduced digital program information signal Pa, the D/A converter 9 outputs two channels, that is, first and second reproduced program information AL and AR in the form of analog signals. These reproduction program information A
L and AR independently filter the information AL and AR (including so-called through state)
The signal is supplied to the filter circuit section 10 which performs the processing. As will be described later, this filter circuit section 10 has a plurality of filter modes having different pass characteristics, and among these filter modes, the -filter mode is selected by operating a changeover switch. The signal from the filter circuit section 10 is transmitted from the reproduction output terminal 24.25 via the muting section 22 which selectively performs muting operation according to the meeting control signal Cm from the system control section 21 and the switch group 23. Output. The switch group 23 has output terminals 24 and 25 for reproducing information of two channels.
The system control unit 21 is for selecting whether to output each channel from the terminals 24 and 25 or to output only the information of one of the channels from the terminals 24 and 25.
Control is performed according to a switch control signal W from the switch control signal W.

On the other hand, the reproduction address data Q from the decoder 7 is supplied to the system control section 21. The system control unit 21 also includes key manual data K from the data input keys 26.
is supplied. Furthermore, data based on the output of the barcode reading section 27 is also supplied to the system control section 21 . That is, the output signal Ba75ζ obtained by reading the barcode placed on the text by the barcode reading section 27
The control data generator 28 generates control data Bb based on the output signal Ba, and supplies the control data Bb to the system controller 21 .

Further, the system control section 21 is connected to, for example, a push-button repeat switch 29 that is provided integrally with the barcode reading section 27 . Furthermore, a control signal CC for controlling the reading position by the optical head 3 is supplied from the system control unit 21 to the reading position control unit 6, and when the reading position control unit 6 is supplied with the control signal CC, the reading position control unit 6 responds to the control signal CC. drive signals cy and Cz are generated and supplied to the optical head 3.

In such a device, the optical head 3 is accessed by having the barcode reader 27 read a barcode placed on the text, and the address of the barcode among the information recorded on the disk 1 is accessed. Only the portion specified by the information is played back. Further, the channel selection state by the switch group 23 is also specified by the channel information included in the barcode,
Both or only one of the two channels of information (for example, English and Japanese) is output from the reproduction output terminals 24 and 25. Here, if the repeat switch 29 is off, the specified part of the information is played once and then the pause state occurs, but if the repeat switch 29 is on, the optical head A digital audio signal (playback digital program information signal Pa) that goes back and forth between two designated points and periodically repeats is supplied to the D/A converter 9, and the information of the designated portion is It will be played repeatedly. This repeat playback continues until new data is input using the barcode reader 27 or the data input key 26, or until the repeat switch 29 is turned off.

Next, a specific example of the configuration of the filter circuit section 10 will be described with reference to FIG. 2. However, although the configuration shown in FIG. 2 is for one channel, a similar configuration for one more channel is actually required. Man .

The power terminal 11 is connected to a selection terminal 12g of a changeover switch 12. This changeover switch 12 and changeover switch 13
is an interlocking switch, for example, a rotary switch with 2 circuits and 6 contacts is used. Changeover switch 1
The two selected terminals 12b to 12e are connected to each other and further connected to the amplifier 14. Amplifier 14 is connected to amplifier 16 via resistor R1 and LPF (low pass filter) 15. In addition, the changeover switch 12
The selected terminals 12a and 12f of are connected to each other,
Furthermore, it is connected to the amplifier 16 mentioned above.

On the other hand, the selection terminal 13g of the changeover switch 13 is connected between the resistor R and the LPF 15. This changeover switch 1
No. 3 selected terminals 13a, 13e, and 13f are open. Further, the selected terminal 13C is connected to HP via the resistor R2, and the selected terminal 13d is connected to HP via the resistors Rs and R2.
F()-Ibus filter) 17, respectively. This HPF 17 is connected to the amplifier 1 via the HPF 18.
6. The selected terminal 13b of the changeover switch 13 is connected to these HPFs 17.18 through a resistor R4.
connected between. The input side of the amplifier 16 is grounded via a resistor R6, and the output side is connected to an output terminal 19 via a resistor R6. Here, an example of the resistance value of each resistor is shown below. R+ −R52R,=
IKΩ, Ω to R221.2, Ω to R3=30, R4=1
．． Ω to 7.

Furthermore, the LPFI 5 has a configuration as shown in FIG. 3, for example. That is, the coils L, ~L, are connected in series, and each capacitor C1 ~ C2 is connected between each coil.
They are each grounded through. In addition, the above HPF1
7 and HPF 18 have a configuration as shown in FIG. 4, for example. That is, in the HPF 17, capacitors C5 to C8 are connected in series, and each capacitor is grounded via each coil L6 to L8.
F18 consists of a capacitor C0 and a coil L0. Here, examples of the self-inductance value of each coil and the capacitance value of each capacitor are shown below. L,=
Ls-" 560 mH, L2 = Ls = L4 = 1
．． OH, La=Lg=39mH, L7=L,=3
3mH, CH=C2=C8=C4=0.68μF,
C,=C,=0.068μF, C6=C,=C,=
0.033 μF0 The pass characteristic of the filter circuit section 10 is as follows:
When a is selected, as shown in FIG. 5(A), a so-called through characteristic (normal mode) is achieved in which signals are passed over the entire frequency band. In addition, when each selected terminal 12b, 13b is selected, as shown in FIG.
As shown in B), an LPF with a cutoff frequency near 300H2 and an attenuation slope of 60dB10ot,
Cutoff frequency near KHz and attenuation slope 30d
This is the characteristic (first hollow mode) of a band-rejection filter formed by combining a HPF of approximately B10ct. Further, when each of the selected terminals 12C and 13c is selected, as shown in FIG. 5(C), the cutoff frequency is around 300H2 and the attenuation slope is 60 dB/. d, with a cutoff frequency near aKH2 and an attenuation slope of 60.
This is the characteristic of a band-rejection filter (second hollow mode) formed by combining a HPF of dBloct and a degree of HPF. Also,
When each of the selected terminals 12d and 13d is selected, as shown in FIG. The level is about 20dB low (,
It has a cutoff frequency around 3KHz and an attenuation slope of 60
This is the characteristic of a band-rejection filter (third hollow mode) formed by combining a HPF of about dB10ct. Moreover, each selected terminal 12e.

When 13e is selected, as shown in FIG. 5(E), the cut-off frequency is near 300H2, the attenuation slope is 60 dB10 ct, and the PF characteristic (°C low frequency mode) is obtained. Moreover, each selected terminal 12f.

13f is selected, the same characteristics (normal mode) as in the case where each selected terminal 12a, 13a is selected, as shown in FIG. 5(F).

In this way, the filter circuit unit 10 operates in a plurality of filter modes having different pass characteristics, five filter modes in this embodiment, namely, a normal mode.

mode, first to third hollow modes, and low-pass mode, and among these filter modes, the - filter mode is selected by a changeover switch 12.13. In addition, regarding the changeover switch 12.13, each selected terminal/child 12a.

13a is selected and each selected terminal 12f
The reason why the characteristics (normal mode) are the same as when , 13f is selected is to improve usability, and the closer selected terminal can be selected without returning the switch to the selected position. By doing so, normal mode can be realized.

In the above-mentioned learning device, for example, the repeat switch 29 is turned on, the barcode section placed on the text is scanned by the barcode reader 27, and the filter mode of the filter circuit section 10 is appropriately selected. Accordingly, learning can be performed using the verhotonal method.

According to this learning device, the repeat time can be arbitrarily set to the optimal time (about 1 second to 8 degrees) for learning using the verhotonal method, making it easy to create teaching materials. Furthermore, although teaching materials using optical discs (DADs) can store much more information than endless tapes, they are relatively inexpensive and economical, and are convenient for storage and organization. Furthermore,
Since the audio signal is digitized and recorded on the disc, the signal quality is good, the learner's fatigue is reduced, and learning efficiency can be increased. Furthermore, the difference in difficulty determined by the pass characteristics of each filter mode may be appropriate.
The transition from easy to difficult occurs naturally, allowing learners to reach their goals relatively easily without losing their motivation to learn. In this way, the learning effect of the verhotonal method can be sufficiently obtained.

Also, if you first get used to learning using the Verhotnaru method in your native language and then start learning a foreign language, you will improve quickly. Furthermore, the Verhotonal learning method is effective in terms of concentration and memory, and can be applied to learning in general, not just foreign languages.

G-2, Second Embodiment This second embodiment is based on the learning card player as disclosed in the specification and drawings of Japanese Patent Application No. 60-22574, which was previously proposed by the applicant. This is a learning device to which the invention is applied, and similar to the first embodiment, a learning device is constructed using the verhotonal method. Therefore, in this embodiment, only the main parts will be explained, and the explanation of other parts will be omitted. In FIG. This magnetic tape 31 has an audio signal (for example, English) recorded on it.The reproducing head 41 is for reproducing the audio signal from the learning card 30. The signal from 41 is passed through amplifier 42 to A
The signal is supplied to the DM section 50.

The ADM section 50 uses adaptive differential modulation (ADM).
It digitizes the audio signal using the ptive delta modulation method and supplies it to the memory section 43, and also demodulates the output from the memory section 43 into an analog signal. The above ADM section 50
In addition to the signal from the playback head 41 described above, a signal is supplied from an external microphone (not shown) connected to a built-in microphone 44 or an external microphone input terminal 45. Selection between the built-in microphone 44 and the external microphone is performed by a changeover switch 46. A signal obtained by the playback head 41 and input to the input processing section 51 via the amplifier 42 and the input terminal 47, or a signal obtained from the built-in microphone 44 and the like and input to the input terminal 48 and the AGC (Automatic Galn)
Control ) circuit 52 and the input processing section 51
The input processing section 51 selects only one of the signals input to the A/b (
(analog/digital) conversion circuit 54.

In this converter circuit 54, the signal is digitized using an integrating circuit 55, and the bit string Do of the digital signal is sent from the output terminal 49 to the memory section 43 and stored therein.

The bit string DI of the digital audio signal outputted from the memory section 43 is supplied to the demodulation circuit 56 via the input terminal 61 and demodulated into an analog audio signal. After harmonic components are removed from this audio signal by the LPF 57, it is supplied to the amplifier 63 via the changeover switch 58 and the output terminal 62. This increase.

The audio signal amplified by the amplifier 63 is normally supplied to a speaker 64 to output audio. However, here, in order to configure a learning device applying the bell-hot null method, a filter unit 66 is connected to the earphone terminal 65, and a speaker 6 is connected to the filter unit 66.
7 and an earphone terminal 68 are connected. Therefore, the audio signal from the amplifier 63 is supplied to the speaker 67 via the filter unit 66, and the audio is output from the speaker 67. The filter unit 66 has, for example, the same configuration as the filter circuit section 10 described in the first embodiment (see FIGS. 2 to 5), and has five filter modes with different pass characteristics. -The filter mode is selected by operating a changeover switch.

Further, the ADM section 50 operates based on a clock φ having a sampling frequency f8 which is supplied to the input terminal 70 from the sampling frequency generation circuit 69, and the CPU (Ce
central processing unit).

ROM (Read Only Memory),
RAM (RandcrnAccess Memory
), etc., and its operation is controlled by a control section 71 that includes components such as . For example, the operation of digitizing the 0 input signal on the ADM section 5 and the demodulation operation of the digital signal supplied from the memory section 43 are switched by the control signal Φ supplied from the control section 71 to the input terminal 72. In addition, the above A
In the DM section 50, the input processing section 51 switches between a signal obtained from the playback head 41 and a signal obtained from the built-in microphone 44 etc. according to a control signal supplied to the input terminal 73, and the signal is then supplied to the input terminal 74. The changeover switch 58 is controlled by the control signal T, and the audio signal demodulated via the demodulation circuit 56 and the audio signal via the input processing section 51 are switched.

Further, the input processing section 51 detects the presence or absence of the audio signal supplied via the AGC circuit 52 and supplies the audio detection signal VD from the output terminal 75 to the control section 71 .

The control unit 71 can control the sampling frequency generation circuit 69 to change the sampling frequency, and also controls the operation of the memory unit 43. In the memory section 43, the address of the memory is specified by the clock φ having the sampling frequency fs from the sampling frequency generation circuit 69 and the control signal from the control section 71.
write.

Operations such as reading are performed.

The control section 71 also includes a card detection switch 76, a mode changeover switch 77, a reset/repeat button 78.
The state of the automatic/manual changeover switch 79, etc. is monitored, and when it is detected that these have been operated, predetermined operations such as card mode, microphone mode, L, L, mode, etc. are performed. Further, the lighting of the recording lamp 80 is also controlled by the control section 7.
1.

In such a learning device, for example, the mode changeover switch 77 is set to card mode, and automatic/
When the automatic mode is set by the manual changeover switch 79, the audio signal reproduced from the study card 30 by the reproduction head 41 is transferred to the ADM section 50. is supplied to the speaker 67 via the filter unit 66 etc., and the A
It is digitized by the DM section 50 and stored in the memory section 43. The digital signal stored in the memory section 43 is read out repeatedly, that is, a periodically repeating digital audio signal is generated, and after being converted into an analog signal by the demodulation circuit 56, it is sent to the speaker 67 via the filter unit 66 etc.
is supplied to perform repeat playback. At this time, by appropriately selecting the filter mode of the filter unit 66, it is possible to perform learning using the Verhotonal method. According to the device of this second embodiment, substantially the same effects as those of the first embodiment can be obtained. The above repeat playback is
until the reset/repeat button 78 is pressed, or
This will continue until you operate a new study card. Furthermore, when the automatic/manual changeover switch 79 is set to manual mode, each time the reset/repeat button 78 is pressed, a digital audio signal is read out from the memory section 43 and audio is output from the speaker 67. .

In addition, filter processing is applied to the audio signal recorded on the learning card in advance, and a normal card corresponding to each filter mode,
If a hollow card, a low frequency card, etc. are prepared, the device configuration does not require a filter unit, but since multiple cards are required for the same content, It is preferable to have a configuration that is

Effects of the Invention The audio signal processing device of the present invention generates a periodically repeating digital audio signal based on an audio signal reproduced from a recording medium such as an optical disk or a magnetic card, and converts this into an analog signal. After that, the output is performed through a filter means whose filter mode can be selected. Therefore, the repeat time can be arbitrarily set to the optimum time (1 second to about 8 degrees) for learning using the Verhotonal method, making it easier to create teaching materials. In addition, teaching materials such as optical discs and magnetic cards are relatively inexpensive and economical, and can be stored and
It is also convenient for organizing. Furthermore, since a digital audio signal that repeats periodically is generated and repeatedly reproduced, the signal quality is good, the learner is less fatigued, and learning efficiency can be increased. As described above, according to the present invention, the learning effect of the verhotonal method can be sufficiently obtained.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a first embodiment of the audio signal processing device according to the present invention, FIG. 2 is a circuit diagram showing a specific configuration example of a filter circuit section, and FIG. 3 is a block diagram showing a specific configuration example of a filter circuit section. A circuit diagram showing a specific configuration example, FIG. 4 is the same <
FIG. 5 is a circuit diagram showing a specific configuration example of the HPF, FIG. 5 is a diagram schematically showing the pass characteristics of the filter circuit section, and FIG. 6 is a block diagram showing a second embodiment of the audio signal processing device according to the present invention. It is a diagram. 1... Optical disk 3... Optical head 6... Reading position control section 8... Program information processing section 9... D/A conversion section 10... Filter circuit section 12.13... Changeover switch 15...LPF 17.18...HPF 21...System control unit 29...Repeat switch 30...Learning card 41...Playback head 43...Memory unit 50...ADM Section 54... Width conversion circuit 56... Demodulation circuit 66... Filter unit 71... Control section

Claims (1)

[Claims] A periodically repeating digital audio signal is generated based on an audio signal reproduced from a recording medium, and after converting this digital audio signal into an analog signal, a plurality of filter modes with different pass characteristics are applied. 1. An audio signal processing device comprising: an audio signal processing device, wherein one of these filter modes is output through a filter means selected by operating a changeover switch.