JP2750502B2 - Relax centralized guidance device, recording device, recording medium and broadcasting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to guiding the frequency of an electroencephalogram to an appropriate frequency according to mental activity when learning audio information or information from the sight or when it is desired to relax such as meditation. And a recording device, a recording medium, and a broadcasting device accompanying the device for promoting learning or guiding the user to a relaxed state.

[0002]

2. Description of the Related Art Normally, when a human is active, an electroencephalogram often shows a beta wave (18 to 30 Hz). on the other hand,
When a person is relaxed, immersed in music appreciation, or is able to concentrate on learning, a θ wave (4 to 8 Hz) or an α wave (8 to 13 Hz) is shown. Conversely, it has been reported that the effect of learning can be enhanced by inducing α waves.

[0003] One of the phenomena in which brain waves are induced is the hemisync effect. This is to give two different sounds to the left and right ears with a difference only by the frequency of the target brain wave, and make the brain feel the difference in frequency between the two sounds as a beat sound, so that the brain wave is close to the beat sound It is to induce frequency.

[0004] As a specific device for this purpose, for example, Japanese Patent Publication No. 02-22674 discloses an oscillator output of two different frequencies having a difference only by the frequency of an electroencephalogram is given to the left and right ears by a speaker or the like. It has been proposed to induce the brain to lower the frequency of brain waves by causing the brain to feel as a beat sound. This method has been found to be effective in inducing brain waves.

[0005]

However, if the conventional technique is used for learning through hearing, the sound for brain wave induction becomes noise when viewed from the sound for learning, and the learning and appreciation cannot be performed. There is a problem that it may be difficult to do so. Further, even in learning through vision, there is a problem in that the sound itself for brain wave guidance is meaningless as information, so that it may become tired if heard for a long time.

[0006]

For this purpose, claim 1 of the present application.
In the low-frequency electric signal of the audio itself to be learned or appreciated is divided into two systems, and the frequency of the low-frequency electric signal is added or subtracted using an audio signal processing device having a frequency adder or a frequency subtractor, and both of them are performed. Sound output means for setting the frequency difference to a frequency fa of an electroencephalogram appearing in a useful state as human mental activity, and outputting as a listening sound to be heard by left and right ears of a listener.

According to a second aspect of the present invention, the input signal is divided into a high frequency band and a low frequency band with a frequency fB set in the audible frequency band as a boundary, and a different signal processing is performed in these two frequency bands. have.

According to a third aspect of the present invention, the audio signal processing device converts the input signal (2) into two signals having a phase difference of θ degrees from each other, and a half-frequency circuit of the brain wave frequency fa. A two-phase oscillator circuit (15) that generates two sine waves having a phase difference of (180-θ) degrees at one frequency, and a low-frequency phase shift circuit (14)
Two multiplication circuits (16) (17) for multiplying the two respective outputs of the two-phase oscillation circuit (15) by the two respective sine wave outputs
And an adder circuit for obtaining the sum and difference of outputs of two multiplier circuits (18)
And a frequency adder / subtracter comprising a subtraction circuit (19).

According to a fourth aspect of the present invention, the audio signal processing device comprises: a low-frequency phase shift circuit (14) for converting the input signal (2) into two signals having a phase difference of θ degrees from each other; (1
A two-phase oscillation circuit (15) that generates two sine waves having a phase difference of 80-θ) degrees, and two outputs of a two-phase oscillation circuit (15) and two outputs of a low-frequency phase shift circuit (14). Two multiplication circuits (16) and (17) for multiplying each of the two sine wave outputs, and an addition circuit (18) or a subtraction circuit for calculating the sum or difference of the outputs of the two multiplication circuits
There is a circuit for outputting either one of the frequency adder or the frequency subtractor (19) and an input signal without frequency conversion.

According to a fifth aspect of the present invention, the audio signal processing device generates a single sideband generating circuit (20) for converting the input signal (2) into a single sideband having a carrier frequency of fC, and generates a signal of fC + fa / 2. Oscillator (21) and Oscillator (22) that generates fC-fa / 2 signal
And a demodulation circuit (23) for demodulating a single sideband with the output signal of the oscillation circuit (21) and a demodulation circuit (24) for demodulating the single sideband with the output signal of the oscillation circuit (22). It has a vessel.

According to a sixth aspect of the present invention, the audio signal processing device converts the input signal (2) into a single sideband having a carrier frequency of fC, and a single sideband generating circuit (20) for generating a signal of fC + fa. Either the circuit (21) or the oscillation circuit (22) that generates the signal of fC-fa, and the demodulation circuit (23) or the single sideband that demodulates the single sideband with the output signal of the oscillation circuit (21) A frequency adder / subtracter comprising one of a demodulation circuit (24) for demodulating the input signal with an output signal of the oscillation circuit (22), and a circuit for outputting the input signal without frequency conversion.

According to a seventh aspect, the audio signal processing apparatus is arranged so that the center frequency fA of the frequency band of the input audio signal (2) is equal to each other by θ.
Two-phase oscillation circuit (2
5) and two multiplication circuits (26) and (27) for multiplying two outputs of the two-phase oscillation circuit (25) and the low-frequency electric signal (2), respectively.
Two filters (28) and (29) that pass low frequencies of respective outputs of the multiplication circuits (26) and (27) with a cutoff frequency of about one half of the frequency bandwidth of the low-frequency electric signal (2). A two-phase oscillation circuit (30) that generates two sine waves having a phase difference of (180-θ) degrees with each other at a frequency of fA + fa / 2 or fA−fa / 2,
Each output of filter (28) (29) and two-phase oscillation circuit (30)
Two multiplication circuits (31) (3
2) and a frequency adder / subtracter comprising an addition circuit (18) and a subtraction circuit (19) for calculating the sum and difference of the output of the multiplication circuit (31) and the output of the multiplication circuit (32).

According to another aspect of the present invention, the audio signal processing apparatus is arranged so that the input audio signal (2) has a center frequency fA in the frequency band of .theta.
Two-phase oscillation circuit (2
5) and two multiplication circuits (26) and (27) for multiplying two outputs of the two-phase oscillation circuit (25) and the low-frequency electric signal (2), respectively.
Two filters (28) and (29) that pass low frequencies of respective outputs of the multiplication circuits (26) and (27) with a cutoff frequency of about one half of the frequency bandwidth of the low-frequency electric signal (2). A two-phase oscillation circuit (30) for generating two sine waves having a phase difference of (180-θ) degrees with each other at a frequency of fA + fa or fA-fa, and two outputs of filters (28) and (29). Two multiplication circuits (31) and (32) for multiplying two outputs of the phase oscillation circuit (30) respectively
And a frequency adder / subtracter comprising one of an adder circuit (18) or a subtractor circuit (19) for obtaining the sum and difference between the output of the multiplier circuit (31) and the output of the multiplier circuit (32), and frequency conversion of the input signal. It has a circuit to output without performing.

According to the ninth aspect, the operation inside the audio signal processing device is performed by a digital circuit.

According to a tenth aspect of the present invention, the low frequency electric signal of the input voice is divided into two systems, and addition or subtraction is performed on the frequency of the low frequency electric signal, and a frequency adder or a frequency adder capable of setting the frequency difference between the two to the brain wave frequency fa. An audio signal processing device having a frequency subtractor, and recording means for stereo recording the two output signals on an audio recording medium are provided.

In the eleventh aspect, the left and right audio signals stereo-recorded on the audio recording medium are shifted from each other by the brain wave frequency fa.

In a twelfth aspect, the low frequency electric signal of the input voice is divided into two systems, and the frequency of the low frequency electric signal is added or subtracted, and the frequency difference between the two is set to the brain wave frequency fa. An audio signal processing device having a frequency subtractor, and a broadcasting unit for broadcasting the two output signals to a stereo receiver are provided.

[Action]

To shift the frequency of the voice means to make a single sideband. Conventionally, the single sideband is mainly several hundred kHz
By modulating the voice signal f to the carrier F having the above frequency, it has been used for wireless communication. The signal of F + f or F-f is generated by the single sidebanding. Normally, the frequency of the carrier F is so high that it cannot be heard by the ear, so that it is not possible to hear directly without detection, but if F is lowered to near the audible frequency, it can be heard directly as voice.

In the present invention, the carrier in the single sideband is set to an extremely low frequency near the frequency of the human brain wave. As an example of claim 1, consider a case where it is desired to induce a frequency of an electroencephalogram to 10 Hz. The audio signal f is converted into a single sideband with a carrier wave F of 5 Hz, and the upper single sideband F + f is heard in one ear and the lower single sideband Ff is heard in the other ear. Ff
Is negative, but the frequency is equal to f−F because only the absolute value matters. Thereby, (F + f) − (f−F) = 2F = 10 Hz corresponding to the difference between the left and right frequencies
Is felt in the brain, and the frequency of the brain wave is induced to 10 Hz. By setting 2F to a frequency that matches the desired mental state, and listening to audio learning materials and favorite music, it is possible to promote learning and induce a relaxed state.

In the second aspect, the audio frequency band is divided by fB. The reason will be described. In order to obtain the hemisync effect, a common signal component on the left and right is indispensable in the low-frequency electric signal (2). For signals that are stereo and have few common components on the left and right, the left and right signals are integrated. There is a need. On the other hand, the frequency band in which the hemisync effect occurs is about 30 to 1000 Hz. Therefore, considering the effect, the frequency addition / subtraction is not necessary at 1000 Hz or more. Therefore, it is sufficient to perform the frequency addition / subtraction processing only on the frequency lower than fB. The low-frequency phase shift circuit (14) and single sideband generation circuit (20) required for the frequency adder / subtractor (3) or (4) require a narrower audio frequency band to separate the left and right signals. Good characteristics can be easily obtained for the unnecessary sideband suppression ratio that determines the degree. In stereo reproduction, in particular, humans perceive the stereoscopic effect of sound because of the difference between the left and right sounds. It is better to output without integrating. For this purpose, it is effective to divide the audio frequency band.

A third aspect of the present invention is an audio signal processing apparatus having a frequency adder / subtracter for slightly shifting the frequency up and down. This is a phase shift network (Phase
ShiftNetwork) is an improved version of the method. This method is inexpensive and provides good characteristics over the entire audio frequency band. In wireless communication applications, usually only one of the upper sideband and the lower sideband is used, so only one of the adder circuit (18) and the subtractor circuit (19) is provided. In order to use both the single sideband and the lower single sideband at the same time, both an addition circuit (18) and a subtraction circuit (19) are provided.

According to a fourth aspect of the present invention, there is provided an audio signal processing apparatus having a frequency adder or a frequency subtracter for slightly shifting the frequency upward or downward. This is also a modification of the single sideband generation method to the phase shift network method.
It has either a frequency adder or a frequency subtractor and a circuit for outputting an input signal without frequency conversion. This method is the cheapest, although the center frequencies of the left and right voices are slightly shifted.

A fifth aspect of the present invention is an audio signal processing apparatus having a frequency adder / subtracter for slightly shifting the frequency up and down. This is a system with a large degree of freedom that can be used in any single-sideband generation system. In this system, a filter system, which is currently the mainstream of the single sideband generation system, can be adopted, so that parts can be easily obtained. In wireless communication applications, usually only one of the upper sideband or lower sideband is used,
The oscillation circuit and the demodulation circuit may be a single set, but in the present invention, in order to use both the upper single sideband and the lower single sideband simultaneously,
Oscillation circuits that generate fC + fa / 2 and fC-fa / 2 signals (21) (22)
And a frequency adder / subtracter composed of two sets of demodulation circuits (23) and (24) for demodulating the single sideband with the output signals of the oscillation circuits (21) and (22).

A sixth aspect of the present invention is an audio signal processing apparatus having a frequency adder or a frequency subtractor for slightly shifting the frequency upward or downward. This is also a system with a large degree of freedom that can be used in any single sideband generation system. It has either a frequency adder or a frequency subtractor and a circuit for outputting an input signal without frequency conversion. This method has the advantage that the center frequencies of the left and right voices are slightly shifted, but relatively inexpensive and easy to obtain parts.

A seventh aspect of the present invention is an audio signal processing apparatus having a frequency adder / subtracter for slightly shifting the frequency up and down. This is an improvement on the third method of the single sideband generation method. This method has the advantage that the circuit scale is smaller than that of the method of claim 5, and that there is no need for a low-frequency phase shift circuit which makes it difficult to obtain and adjust parts compared to the method of claim 3. In wireless communication applications, since only one of the upper sideband and the lower sideband is normally used, only one of the adding circuit (18) and the subtracting circuit (19) is provided. In order to use both the waveband and the lower sideband at the same time, both an adder circuit (18) and a subtractor circuit (19) are provided.

An eighth aspect of the present invention is an audio signal processing apparatus having a frequency adder or a frequency subtracter for slightly shifting the frequency upward or downward. This is also a modification of the third method of the single sideband generation method. This method requires a smaller circuit scale than the method of claim 6,
Compared with the method of the fourth aspect, there is an advantage that a low-frequency phase shift circuit, which is difficult to obtain and adjust parts, is not required.

According to the ninth aspect, since the operation inside the audio signal processing apparatus is performed by a digital circuit, there is an advantage that there is little difficulty in adjustment peculiar to the analog circuit and little concern about a change over time in characteristics. Further, since a linear phase filter that cannot be realized by an analog circuit can be configured, the group delay characteristics of the frequency adder / subtracter can be improved, and natural sound quality can be obtained. In addition, if the resolution and processing speed of the digital signal processing device are increased, higher performance can be achieved more stably than using an analog circuit, and this is a circuit system that is more and more advantageous in the future.

[0028] Claims 10 and 11 are a recording device and a recording medium for stereo recording the output signal of the audio signal processing device. When the recording medium according to claim 11 recorded by the recording apparatus according to claim 10 is used, many people can enjoy the effect of the present relaxed concentration guidance apparatus at low cost by playing back using an existing voice playback apparatus. .

A twelfth aspect of the present invention is a broadcasting device capable of stereo broadcasting an output signal of the audio signal processing device. Broadcasting music programs and educational programs with this device allows many people to enjoy the benefits of this relaxed centralized guidance device at a low cost, by using existing receiving devices to allow many people to relax deeply and enhance the learning effect. Can be.

[0030]

An embodiment will be described with reference to the drawings. FIG. 1 shows the basic concept of the present apparatus. The low frequency electric signal (2) from the information source (1) of the sound to be learned or watched is divided into two systems in the sound signal processing device (5). If the low frequency electric signal (2) is monaural, it is divided into two systems. If it is stereo, it may be used as it is, or a part or all of the signal may be integrated and then divided. The information of the voice to be learned and music or the like in a frequency band in which brain waves are easily induced may be integrated and then divided. Then, the frequency of one low-frequency electric signal is increased by the frequency adder (3), the frequency of the remaining one low-frequency electric signal is reduced by the frequency subtractor (4), and the frequency difference between both outputs is desired. Set to the frequency fa of the EEG, headphones or speakers, etc.
The sound is converted into a sound by (6) and transmitted to both ears of the listener (7). Here, the electroencephalogram frequency fa is a frequency of an electroencephalogram generated in a state that is useful as a mental activity of a human, and in the past, from 1 Hz during sleep to about 18 Hz before β wave. Conceivable. When relaxing is desired, the frequency difference fa is preferably set to 4 to 8 Hz, which is the range of the θ wave. When you want to concentrate and learn
The frequency is set to 5 to 13 Hz which is a wave region. Also, fa is 14 Hz which is the frequency of the brain wave generated at the start of sleep, or 1 to 4 of the region of the δ wave which is the frequency of the brain wave during sleep.
By setting to Hz, an effect of leading to sleep can be expected. An area near the β wave above the α wave may also help prevent blurring of the elderly. Instead of using headphones, earphones, or speakers, a device called a body sonic actuator that directly applies vibration of several hundred Hz or less to the human body, or a device that applies sound information by exciting a skeleton near the ears may be used. good.

FIG. 2 shows the simplest embodiment. The low frequency electric signal (2) from the information source (1) of the sound to be learned or watched is divided into two systems in the sound signal processing device (5).
The frequency of one low-frequency electric signal is increased or decreased by a frequency adder (3) or a frequency subtractor (4), and the remaining one uses the original signal (2) as it is. The difference between the two frequencies is set to the desired frequency E of the brain wave, converted into a sound by a headphone or a speaker (6), and transmitted to both ears of the listener (7). In this embodiment, the average value of the frequencies heard by both ears deviates from the original sound, but there is an advantage that the configuration can be simplified.

The embodiment shown in FIG. 3 shows an example of the second aspect. A low-frequency electric signal (2) of a sound to be learned or viewed is divided at a frequency fB set in an audible frequency band. fB is preferably about 200 to 2000H
z, more preferably about 500-1000 Hz. fB
Signals with lower frequency components are passed through a low-pass filter (8) that passes frequency components lower than fB, then divided into two systems, and a frequency adder (3) and a frequency subtractor (4).
Shift the frequency slightly with. For signals with frequency components higher than fB, the signal passes through a high-pass filter (9) that passes frequency components higher than fB, then splits into two systems, and the output of a frequency adder (3) and a frequency subtractor (4). Each adder circuit
(10) Addition is performed in (11), and after adding the frequency components higher and lower than fB, the sound is converted to sound by headphones or speakers (6) and transmitted to both ears of the listener (7) Let it.

The embodiment shown in FIG. 4 is also an example of the second aspect. The low-frequency electrical signal of the sound you are trying to learn or appreciate
(2) shows the case of two-channel stereo. fB
For signals with lower frequency components, add the signals of the left and right channels with the adder
After passing through (8), it is divided into two systems, and the frequency is slightly shifted by the frequency adder (3) and the frequency subtractor (4). For the signal of the frequency component higher than fB, each of the left and right channels passes through a high-pass filter (9) (13) that passes the frequency component higher than fB, and one of them is output from the frequency adder (3). The remaining one is added to the output of the frequency subtractor (4) by the adder circuits (10) and (11), and the frequency components higher and lower than fB are added. It is converted into voice and transmitted to both ears of the listener (7).

The embodiment shown in FIG. 5 is a frequency adder / subtracter for slightly shifting the frequency according to the third aspect. The low-frequency electrical signal (2) of the sound to be learned or viewed is θ degrees (0 <θ <180) mutually in the audio frequency band by a low-frequency phase shift circuit (14).
Are converted into two signals having the following phase difference. One output of the low-frequency phase shift circuit (14) is a two-phase oscillating circuit (15) that generates two sine waves of a frequency half of the brain wave frequency fa having a phase difference (180-θ) degrees from each other. ) And the multiplication circuit (16)
Multiplied by The other output of the low-frequency phase shift circuit (14) is connected to the other sine wave output of the two-phase oscillation circuit (15) and the multiplication circuit (1
Multiplied by 7). Since the transmission frequency of the two-phase oscillation circuit (15) is a carrier in a single sideband in wireless communication, it is usually several hundred kHz.
As described above, in this embodiment, the frequency is set to one half of the desired brain wave frequency fa. The outputs of the two multipliers are added to the adder (1
8) is added to form a single sideband. The subtraction circuit (19) outputs the difference between the outputs of the two multiplication circuits, and the upper and lower sides of the output from the addition circuit (18) are opposite to the single sideband. For wireless communication, since only one of the upper sideband and the lower sideband is normally used, only one of the adding circuit (18) and the subtracting circuit (19) is provided. The summing circuit (1
8) and a subtraction circuit (19). However, when used as the audio signal processing device of the embodiment shown in FIG. 2, only one of the adding circuit (18) and the subtracting circuit (19) is required.
At this time, the output frequency of the two-phase oscillation circuit (15) needs to be the brain wave frequency fa.

The embodiment shown in FIG. 6 is a frequency adder / subtracter for slightly shifting the frequency according to the fifth aspect. The single sideband generation circuit (20) is a circuit similar to that used in wireless communication with a carrier frequency of fC. fC can be freely selected. As a method of single sideband generation, there are known four methods called a filter method, a phase shift network method, a third method, and a fourth method, but any of these methods may be used. The invented method may be used. Here, the single sideband is an upper (lower) sideband. The signal converted into a single sideband by the single sideband generation circuit (20) is demodulated by a demodulation circuit (23) and a demodulation circuit (24). Here, the demodulation signal supplied from the oscillation circuit (21) to the demodulation circuit (23) is fC + fa / 2. Therefore, the demodulation circuit (2
The output of 3) is lower (higher) by fa / 2 than the original signal (2). Similarly, since the demodulation signal supplied from the oscillation circuit (22) to the demodulation circuit (24) is fC−fa / 2, the output of the demodulation circuit (24) is only fa / 2 than the original signal (2). Higher (lower). As a result, two signals having a difference of fa are obtained as outputs of the two demodulation circuits. However, when used as the audio signal processing device of the embodiment shown in FIG. 2, only one oscillation circuit and one demodulation circuit are required. At this time, the output frequency of the oscillation circuit needs to be fC + fa or fC-fa.

The embodiment shown in FIG. 7 is a frequency adder / subtracter for slightly shifting the frequency according to the seventh aspect. The input low-frequency electric signal (2) is divided into two systems. Assuming that the frequency band of the low-frequency electric signal (2) is 100 to 5000 Hz, one system has a center frequency of 2550 Hz in the frequency band of the low-frequency electric signal (2).
The multiplication circuit (26) multiplies one output of a two-phase oscillation circuit (25) that generates two sine waves having a phase difference of θ degrees from each other. The remaining one system is multiplied by the other output of the two-phase oscillation circuit (25) by the multiplication circuit (27). After that, both systems have a frequency of about one half of the frequency bandwidth of the low-frequency electrical signal (2).
After the high-frequency components are removed by the low-pass filters (28) and (29) whose cutoff frequency is around 50 Hz, the multiplication circuit (31)
In (32), the output is multiplied by the output of a two-phase oscillation circuit (30) that generates two sine waves having a phase difference of (180-θ) degrees from each other. Since the transmission frequency of the two-phase oscillation circuit (30) is a carrier in a single sideband in wireless communication, it is usually several hundred kHz or more, but in this embodiment, the center frequency of the low-frequency electric signal (2) is 2550 kHz.
2550Hz + fa / 2 or 2550Hz-fa / 2 based on Hz
Set to. The outputs of the two multipliers are added by an adder (18) to form a single sideband. Further, the subtraction circuit (19) outputs the difference between the outputs of the two multiplication circuits, which is also a single sideband whose upper and lower sides are opposite to the output of the addition circuit (18). As in the embodiment shown in FIG. 5, since only one of the upper sideband and the lower sideband is normally used for wireless communication, only one of the adder circuit (18) and the subtractor circuit (19) is used. Although not provided, in this embodiment, both the adder circuit (18) and the subtractor circuit (19) are provided to allow the upper sideband to be heard by one ear and the lower sideband to be simultaneously heard by the remaining ear. However, when used as the audio signal processing device of the embodiment shown in FIG. 2, the addition circuit (18) or the subtraction circuit (1
Only one of 9) is required. At this time, the output frequency of the two-phase oscillation circuit (30) is 2550Hz + fa or 2550Hz-
must be fa.

FIG. 8 shows the ninth, tenth, and eleventh aspects.
The following shows an example. This figure shows a configuration in which a digital circuit performs frequency addition and subtraction based on analog audio information and performs digital recording. The signal from the analog audio source (33)
It is converted into a digital signal by an analog / digital converter (34). After that, the digital signal processing device (35) performs frequency addition and subtraction processing, and the digital recording device (36) records on a digital recording medium (37) such as a compact disk, digital audio tape, mini disk, etc. 7) for use.

The embodiment shown in FIG. 9 is an example of the ninth embodiment, and shows a configuration in which the frequency addition and subtraction are performed by a digital circuit based on analog audio information, and the listener uses it on the spot. The signal from the analog audio information source (33) is converted into a digital signal by an analog / digital converter (34). Thereafter, frequency addition and subtraction processing is performed by the digital signal processing device (35), which is converted into an analog audio signal by the digital / analog converter (39), and the listener can use the headphones or the like (6).
(7) is transmitted to both ears.

The embodiment shown in FIG. 10 is also an example of the ninth aspect. Compact disc, digital audio tape,
This figure shows a configuration in which frequency addition and subtraction of digital audio information such as a mini-disc is performed by a digital circuit, and the listener uses the information on the spot. Information from a digital audio information source (40), such as a compact disk player, digital audio tape player, or mini disk player, is directly subjected to frequency addition and subtraction processing by a digital signal processing device (35), and is processed by a digital / analog converter (39). It is converted into an analog audio signal and transmitted to both ears of the listener (7) through headphones or the like (6). With this configuration, when a compact disk player, digital audio tape player, mini disk player, or the like is used, the effects of the present device can be easily enjoyed only by adding the digital signal processing device (35).

FIG. 11 shows an embodiment according to the tenth and eleventh aspects. With the frequency of the low-frequency electric signal (2) for learning or appreciation slightly shifted by the frequency adder (3) and the frequency subtractor (4), the sound was recorded by the stereo recording device (41) and recorded. After a recording medium (42) such as a cassette tape is interposed, reproduction is performed by a stereo reproducing device (43). In this method, materials for learning or appreciation are limited, but the effect of the present apparatus can be enjoyed at a low price.

FIG. 12 shows a twelfth embodiment. While the frequency of the low-frequency electric signal (2) for learning or appreciation is slightly shifted by the frequency adder (3) and the frequency subtractor (4), stereo broadcasting is performed by the stereo transmitter (44), and stereo broadcasting is performed. Reception is performed by the receiver (47). Although this method has limited learning or appreciation materials, it can enhance the learning and relaxation effects of many listeners. Here, the stereo broadcast means a broadcast using a plurality of systems as information of one program, and includes audio multiplex broadcast and the like.

In addition, the present apparatus is also effective as an apparatus for introducing meditation. It can also be used as a part of a sensory resonance device that strongly induces brain waves by combining light, sound, electrical stimulation of the head, vibration, and the like.

[0043]

Since the present invention is configured as described above, it has the following effects.

According to the present invention, the frequency of the sound for learning or appreciation is slightly shifted and given to the left and right ears, so that the brain wave can be performed without doing anything other than listening to the sound for learning or appreciation. Can be induced to an appropriate value according to the mental activity, and the efficiency of learning can be increased and a deep relaxation state can be induced.

According to the second aspect, the frequency band handled by the frequency adder / subtracter can be narrowed by dividing the input signal into a high frequency band and a low frequency band with a frequency fB set in the audible frequency band as a boundary. As a result, the unnecessary sideband suppression ratio can be improved, so that distortion in the audio output signal can be finally reduced. In addition, it is possible to achieve both a brain wave guiding effect and a stereo feeling.

Claims 3 and 4 improve the phase shift network system of the single sideband generation systems to constitute a frequency adder / subtracter for slightly shifting the frequency up and down. A frequency adder / subtractor can be realized with the simplest circuit configuration.

According to the fifth and sixth aspects, the type of the single sideband generation circuit (20) which can be regarded as the heart of the frequency adder / subtracter can be freely selected. Since a filter system which is the mainstream of the current single sideband generation circuit can be used, it is easy to obtain parts.

Claims 7 and 8 are obtained by improving the third of the single sideband generation systems to constitute a frequency adder / subtracter for slightly shifting the frequency up and down. This method has the advantage that the circuit scale is smaller than the methods of claims 5 and 6, and the low-frequency phase shift circuit (14), which is difficult to obtain and adjust the parts, is not required as compared with the methods of claims 3 and 4. is there.

According to the ninth aspect of the present invention, since the operation inside the audio signal processing device is performed by a digital circuit, there is almost no difficulty in adjustment peculiar to the analog circuit and there is almost no concern about a change over time in characteristics. Further, since a linear phase filter that cannot be realized by an analog circuit can be configured, the group delay characteristics of the frequency adder / subtracter can be improved, and natural sound quality can be obtained.

Claims 10 and 11 are a recording device and a recording medium for stereo recording the output signal of the audio signal processing device. When the recording medium according to claim 11 recorded by the recording apparatus according to claim 10 is used, many people can enjoy the effect of the present relaxed concentration guidance apparatus at low cost by playing back using an existing voice playback apparatus. .

A twelfth aspect is a broadcasting device capable of stereo broadcasting an output signal of the audio signal processing device. Broadcasting music programs and educational programs with this device allows many people to enjoy the benefits of this relaxed centralized guidance device at a low cost, by using existing receiving devices to allow many people to relax deeply and enhance the learning effect. Can be.

[0052]

[Brief description of the drawings]

FIG. 1 is a block diagram showing a basic concept of the present apparatus.

FIG. 2 is a block diagram showing the simplest embodiment of the present apparatus.

FIG. 3 is a block diagram showing an embodiment of the present apparatus in which the frequency is shifted by a low frequency range.

FIG. 4 is a block diagram showing an embodiment of the stereo audio input type apparatus in which the frequency is shifted by a low frequency region.

FIG. 5 is a block diagram showing an embodiment of a frequency adder / subtractor in which the phase shift network type single sideband generator is improved.

FIG. 6 is a block diagram showing an embodiment of a frequency adder / subtractor in which a single sideband generator and a demodulator are combined.

FIG. 7 is a block diagram showing an embodiment of a frequency adder / subtracter in which the single sideband generator of the third system is improved.

FIG. 8 is a block diagram showing an embodiment in which a frequency adder / subtracter is constituted by a digital circuit, and a digital recording device and a digital recording medium are reproduced after being used.

FIG. 9 is a block diagram showing an embodiment in which frequency addition and subtraction are performed by a digital circuit based on analog audio information and used by a listener on the spot.

FIG. 10 is a block diagram showing an embodiment in which digital audio information is subjected to frequency addition and subtraction by a digital circuit, and used by a listener on the spot.

FIG. 11 is a block diagram showing an embodiment of the present apparatus using a recording device and a recording medium.

FIG. 12 is a block diagram showing an embodiment of the present device using a broadcasting device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Information source of audio 2 Low frequency electric signal, input audio signal 3 Frequency adder 4 Frequency subtracter 5 Audio signal processing device 6 Headphones, speakers, etc. 7 Listener 8 Low-pass filter 9, 13 High-pass filter 10, 11, 12 Addition circuit 14 Low frequency phase shift circuit 15, 25, 30 Two-phase oscillation circuit 16, 17, 23, 24 Demodulation circuit 18 Addition circuit 19 Subtraction circuit 20 Single sideband generation circuit 21, 22 Oscillation circuit 26, 27, 31 , 32 Multiplying circuit 28, 29 Low-pass filter 33 Analog audio information source 34 Analog-to-digital converter 35 Digital signal processor 36 Digital recording device 37 Digital recording medium 38 Digital playback device 39 Digital-to-analog converter 40 Digital audio information source 41 Stereo recording Device 42 Recording medium 43 Stereo player 44 Stereo transmitter 45 Antenna for transmission 46 Antenna for reception 47 Stereo receiver

Claims (12)

(57) [Claims] 1. A low-frequency electric signal of a sound to be learned or viewed is divided into two systems irrespective of the number of signal systems, and only one system or both systems are added to or subtracted from the frequency of the low-frequency electric signal. An audio signal processing device having a frequency adder or a frequency subtractor capable of setting a frequency difference between the two to the brain wave frequency fa, and listening to the listener's left and right ears for two systems of output signals of the audio signal processing device And a sound output means for outputting as sound. 2. An audio signal processing device which divides an input audio signal into a high frequency band and a low frequency band with a frequency fB set in the audible frequency band as a boundary, and performs different signal processing in these two frequency bands. 2. The relaxed concentration guiding device according to claim 1, comprising: 3. An audio signal input by an audio signal processing device.
(2) a low-frequency phase shift circuit (14) that converts two signals having a phase difference of θ degrees from each other in the audio frequency band, and (180−θ) each other at half the frequency of the brain wave frequency fa. A two-phase oscillating circuit (15) that generates two sine waves with a phase difference of one degree, and one output of the low-frequency phase shift circuit (14) is multiplied by one sine wave output of the two-phase oscillating circuit (15) A multiplication circuit (17) that multiplies the remaining one output of the low-frequency phase shift circuit (14) and the other sine wave output of the two-phase oscillation circuit (15), and two multiplication circuits 2. A relax concentration system according to claim 1, further comprising a frequency adder / subtracter comprising an addition circuit for obtaining a sum of outputs and a subtraction circuit for obtaining a difference between outputs of the two multiplication circuits. Guidance device. 4. An audio signal input by an audio signal processing device.
(2) a low-frequency phase shift circuit (14) that converts the two signals into two signals having a phase difference of θ degrees in the audio frequency band, and a phase difference of (180-θ) degrees at the brain wave frequency fa A two-phase oscillation circuit (15) for generating two sine waves, and a multiplication circuit (16) for multiplying one output of the low-frequency phase shift circuit (14) and one sine wave output of the two-phase oscillation circuit (15) A multiplication circuit (17) for multiplying the remaining one output of the low-frequency phase shift circuit (14) and the other sine wave output of the two-phase oscillation circuit (15), and an addition for obtaining the sum of the outputs of the two multiplication circuits A circuit (18) or a subtractor (19) for calculating the difference between the outputs of the two multipliers, a frequency adder or a frequency subtractor, and a circuit for outputting the input signal without frequency conversion. 2. The relaxed concentration guiding device according to claim 1, wherein the device has a relaxed concentration. 5. An audio signal input by an audio signal processing device.
(2) A single sideband generation circuit (20) that converts a signal into a single sideband with a carrier frequency of fC, and an oscillation circuit that generates a signal of fC + fa / 2
(21) and an oscillation circuit (22) for generating a signal of fC−fa / 2,
Demodulation circuit that demodulates single sideband with output signal of oscillation circuit (21)
2. The relax concentration apparatus according to claim 1, further comprising a frequency adder / subtractor comprising a demodulator circuit for demodulating a single sideband with an output signal of the oscillation circuit. Guidance device. 6. An audio signal input by an audio signal processing device.
(2) A single sideband generation circuit (20) that converts a signal into a single sideband with a carrier frequency of fC, and an oscillation circuit that generates a signal of fC + fa
(21) or an oscillation circuit (22) for generating a signal of fC-fa, and a demodulation circuit (2) for demodulating a single sideband with an output signal of the oscillation circuit (21).
3) Or a frequency adder or a frequency subtractor consisting of a demodulation circuit (24) that demodulates a single sideband with the output signal of the oscillation circuit (22), and a circuit that outputs the input signal without frequency conversion 2. The relaxed concentration guiding device according to claim 1, comprising: 7. An audio signal input by an audio signal processing device.
(2) A two-phase oscillation circuit (25) that generates two sine waves having a phase difference of θ degrees at the center frequency fA of the frequency band of (2), and one output of the two-phase oscillation circuit (25) is connected to a low-frequency electric circuit. A multiplier (26) for multiplying the low-frequency electric signal (2) by the other output of the two-phase oscillation circuit (25);
And a filter (28) that passes a low frequency of the multiplication circuit (26) with a cut-off frequency of about one half of the frequency bandwidth of the low-frequency electric signal (2), and multiplies with the same characteristics as the filter (28). circuit
A filter (29) that passes the low-pass of the output of (27), and a two-phase that generates two sine waves with a frequency of fA + fa / 2 or fA-fa / 2 and a phase difference of (180-θ) degrees from each other An oscillation circuit (30), a multiplication circuit (31) for multiplying the output of the filter (28) by one output of the two-phase oscillation circuit (30), and an output of the filter (29) and the two-phase oscillation circuit (30). A multiplication circuit (32) for multiplying the remaining one output,
An addition circuit (18) for adding the output of the multiplication circuit (31) and the output of the multiplication circuit (32), and a subtraction circuit (19) for obtaining a difference between the output of the multiplication circuit (31) and the output of the multiplication circuit (32). The relaxed intensive guidance device according to claim 1, further comprising a frequency adder / subtractor. 8. An audio signal input by an audio signal processing device.
(2) A two-phase oscillation circuit (25) that generates two sine waves having a phase difference of θ degrees at the center frequency fA of the frequency band of (2), and one output of the two-phase oscillation circuit (25) is connected to a low-frequency electric circuit. A multiplier (26) for multiplying the low-frequency electric signal (2) by the other output of the two-phase oscillation circuit (25);
And a filter (28) that passes a low frequency of the multiplication circuit (26) with a cut-off frequency of about one half of the frequency bandwidth of the low-frequency electric signal (2), and multiplies with the same characteristics as the filter (28). circuit
A filter (29) that passes the low band of the output of (27) and a two-phase oscillator circuit (30) that generates two sine waves having a frequency of fA + fa or fA-fa and a phase difference of (180-θ) degrees from each other. ), A multiplier (31) that multiplies the output of the filter (28) and one output of the two-phase oscillation circuit (30), and the output of the filter (29) and the two-phase oscillation circuit.
A multiplication circuit (32) that multiplies the remaining one output of (30), an addition circuit (18) that adds the output of the multiplication circuit (31) and the output of the multiplication circuit (32), or the output of the multiplication circuit (31). A patent comprising a frequency adder or a frequency subtractor comprising a subtraction circuit (19) for obtaining a difference between outputs of a multiplication circuit (32) and a circuit for outputting an input signal without frequency conversion. The relaxed concentration guidance device according to claim 1. 9. The relaxed concentration guidance device according to claim 1, wherein the operation inside the audio signal processing device is performed by a digital circuit. 10. The low-frequency electric signal of a sound to be learned or viewed is divided into two systems regardless of the number of signal systems.
An audio signal processing device having a frequency adder or a frequency subtractor that can add or subtract either one system or the two systems to the frequency of the low-frequency electric signal, and set the frequency difference between the two to the brain wave frequency fa. Recording means for stereo-recording two output signals of the audio signal processing device on an audio recording medium. 11. A recording medium characterized in that left and right audio signals recorded in stereo are shifted from each other by an electroencephalogram frequency fa. 12. The low-frequency electric signal of the sound to be learned or watched is divided into two systems regardless of the number of signal systems, and only one or both systems add or subtract to or from the frequency of the low-frequency electric signal. And an audio signal processing device having a frequency adder or a frequency subtractor capable of setting the frequency difference between the two to the brain wave frequency fa, and the two output signals of the audio signal processing device are broadcast to a stereo receiver. A broadcasting device comprising: a broadcasting unit.