JPH01208099A - Music-oscillation converter - Google Patents

Abstract

PURPOSE:To given the oscillation matched to a sound pressure level at the time of hearing with ears to a human body by equipping with an envelope composition extracting circuit to extract the envelope component of a music signal, an oscillation circuit to output the oscillation signal of a prescribed frequency and a modulating circuit to amplitude-modulate an oscillation signal with an envelope component and to obtain a driving signal for oscillating an oscillator. CONSTITUTION:When an oscillation is given to a human body while music is heard, an oscillator is late oscillated for the change of the sound pressure level of a music signal and the oscillation, which is felt to the human body, does not match with the music. Therefore, a direct current component is removed by a bias circuit 3, and the generation of such a problem is prevented. Namely, the envelope component of the music signal obtained through an envelope component extracting circuit 7 is inputted to a modulating circuit 5, the oscillating signal of a prescribed frequency, which is the output of an oscillating circuit 4, is amplitude- modulated and the output of the modulating circuit 5 is given to the oscillator stuck to the human body. At this time, after a level difference is expanded by an amplifying circuit 2, the direct current component is removed by a bias adjusting circuit 3, and therefore, the oscillation felt at the human body becomes approximately zero, and only the oscillation of the sound pressure level to emphasize the intensity can be felt by the human body.

Description

[Detailed Description of the Invention] [Industrial Application Field 1] The present invention includes a vibrator arranged so as to be able to impart vibration to the body, and vibrates the vibrator by a drive signal based on a music signal. The present invention relates to a music-vibration conversion device that allows music to be felt with the body.

[Prior Art] In recent years, music experience systems have been provided that allow users to feel music through vibrations applied to their bodies. This type of music experience system uses a vibrator that can vibrate the body, and generally vibrates at a low frequency of 150 Hz or less.

[Problems to be Solved by the Invention] There is a problem with the Jubei Karusei that vibrations cannot be felt for music that has few low frequency components. Humans can sense the high and low frequencies and the sound pressure level of music, but in rock, new music, vocals, etc., we mainly sense changes in the sound pressure level, so the frequency below 150 Hz. In these songs, which have relatively few low frequency components, there is a problem that there is a discrepancy between the vibration felt by the body and the white sum. Furthermore, there is a problem in that the vibrator does not vibrate in the case of natural sea noise, which has almost no low frequency components and only changes in sound pressure level.

The present invention aims to solve the above-mentioned problems, and provides a music-vibration conversion device that allows the user to experience vibrations corresponding to the sound pressure level of music. .

[Means for Solving the Problems] In order to achieve the above object, the present invention provides an envelope component extraction circuit that receives a music signal and extracts an envelope component of the music signal, and an oscillation circuit that outputs a vibration signal of a predetermined frequency. Then, the amplitude of the vibration signal is changed by the envelope component i1! ! The device is equipped with a modulation circuit that obtains a drive signal for vibrating the vibrator.

Furthermore, the music signal may be input to the envelope component extraction circuit through a low-pass filter that extracts components corresponding to frequencies below the human voice frequency from the input signal.

[Operation 1] According to the above configuration, the envelope component extracting circuit can extract a component corresponding to the sound pressure level from Music No. 43, and this component can amplitude-modulate the vibration signal output from the oscillation circuit. By creating a drive signal to the vibrator, the vibration level of the vibrator can be made to correspond to the sound pressure level of the music signal.

If you are extracting the component corresponding to the human voice frequency or lower from the music signal through a low-pass filter, and driving the music signal corresponding to the envelope component only after passing through the low-pass filter (to obtain g) In this case, it is possible to respond mainly to changes in the sound pressure level of a human voice.

['X Example IJ #S1 As shown in the figure, basically 1, the envelope I? from the music signal? It includes an envelope component extraction circuit that extracts the F component, an oscillation circuit 4 that outputs a vibration signal of a predetermined frequency, and a modulation circuit 5 that modulates the amplitude of the vibration signal using the envelope component. A well-known vibrator, such as a vibrator or speaker, is vibrated. The vibrator is placed close to the body so that the vibration can be felt by the body, and it can be attached directly to the body,
It is often incorporated into chairs, beds, etc.

The envelope component extraction circuit has an envelope detection circuit 1 to which a music signal (FIG. 2(a)) is input, and the envelope detection circuit 1 extracts the envelope component of the music signal (FIG. 2(b)). )). The envelope component is sent to the amplifier circuit 2 in order to expand the difference in level.
However, the output of amplifier circuit 2 (liS2 diagram (C)
) is superimposed on the DC component VD. As mentioned above, the output of the envelope component extraction circuit is input to the modulation circuit 5 and modulates the amplitude of the output of the oscillation circuit 4. Therefore, when the output of the amplifier circuit 2 is directly input to the modulation circuit, the sound pressure level of the music signal is Even when the level is minute, the vibrator will vibrate at a level equivalent to the superimposed DC component, and this will cause a discrepancy between the vibration level felt by the body and the sound pressure level of the music signal. It will be necessary to remove it. Therefore, the output of the amplifier circuit 2 is input to the bias adjustment circuit 3, and the DC component is removed (FIG. 2(d)). The bias adjustment circuit 3 is composed of a differential amplifier circuit, and the output of the amplifier circuit 2 is input to one input terminal, and a DC voltage for bias adjustment is applied to the other input terminal. That is, this DC voltage is adjusted to I4 by the variable resistor Vr so as to cancel out the DC component of the output signal of the amplifying corner circuit 2. If you want to remove the DC component, you can insert a capacitor, but if you want to pass the low-frequency envelope component and remove only the DC component, you need a large-capacity capacitor. This increases the phase lag, so when you are applying vibrations to your body while listening to music, the vibrator vibrates with a delay in response to changes in the sound pressure level of the music signal, and the vibrations felt by your body are not consistent with the music. The problem arises that it no longer works. In the configuration of this embodiment, the bias adjustment circuit 3 removes the DC component to prevent such problems from occurring.

The envelope component of the music signal obtained through the envelope component extraction circuit as described above is input to the modulation circuit 5, which amplitude modulates the vibration signal of a predetermined frequency that is the output of the oscillation circuit 4.
The output of the modulation circuit 5 is a drive signal to the vibrator (Fig. 2(e)
). Here, as mentioned above, after the level difference is expanded in the amplifier circuit 2, the DC component is removed in the bias voltage adjustment circuit 3, so when the sound pressure level is approximately zero level, the vibration felt by the body is also approximately zero. Moreover, since the vibrations are applied to the body in a manner that emphasizes the strength and weakness of the sound pressure level, it is possible to experience the vibrations in a way that is intense.

[Embodiment 2] In this embodiment, the music signal is passed through a low-pass filter 6 as pre-processing before being input to the envelope detection circuit 1. The low-pass filter 6 has a cutoff frequency of 300 to 500.
Hz, and frequency components higher than this are removed from the music signal.

Therefore, the low-pass filter 6 extracts only frequency components relatively close to the envelope component from the music signal (FIG. 4(a)) (FIG. 4(b)).

In addition, the human voice in vocal songs etc. has a frequency of 300 to 1500Hz.
Therefore, by using the low-pass filter 6 having a cutoff frequency of 300-500 Hz, it is possible to extract a music signal that corresponds well to the human voice.

The music signal that has passed through the low-pass filter 6 is input to the envelope detection circuit 1, where the envelope component (FIG. 4(C)) is extracted.
This envelope component is input to the modulation circuit 5, and the output of the oscillation circuit 4 is amplitude-modulated.

According to this configuration, in the case of a vocal song, the vibrator can be vibrated particularly well in response to changes in the sound pressure level of the singer's voice. Moreover, when the low-pass filter 6 is not used, the output of the -envelope detection circuit 1 is
As shown in FIG. 4(d), this includes a direct current component, and for the reason explained in Example 1, the vibration felt by the body may be uneven, but this example has no problem with this. has also been resolved.

[Effects of the Invention] As described above, the present invention includes an envelope component extraction circuit that receives a music signal and extracts the envelope component of the music signal, an oscillation circuit that outputs a vibration signal of a predetermined frequency, and an oscillation circuit that extracts the envelope component of the vibration signal. Since it is equipped with a modulation circuit that obtains a drive signal that modulates the amplitude to vibrate the vibrator, the envelope component extraction circuit can extract a component corresponding to the sound pressure level from the music signal, and this component By amplitude modulating the vibration signal output from the oscillation circuit and creating a drive signal for the vibrator, the vibration level of the vibrator can be made to correspond to the sound pressure level of the music signal. As a result, regardless of the type of music, it is possible to apply vibrations to the body that match the sound pressure level when a person listens to the music.

In addition, if the music signal is input to the envelope component extraction circuit through a low-pass filter that extracts components corresponding to frequencies below the human voice frequency from the input signal, only the envelope component of the music signal that mainly corresponds to the human voice will be extracted. Because it will be done,
This allows it to respond to changes in the sound pressure level of a human voice.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram showing a first embodiment of the present invention, Fig. 2 is an explanatory diagram of the same operation as above, Fig. 3 is a circuit diagram showing a second embodiment of the present invention, and Fig. 4 is an explanatory diagram of the same operation as above. be. 4... Oscillation circuit, 5... Modulation circuit, 6... Low pass filter, 7... Envelope component extraction circuit. Agent Patent Attorney Ishi 1) Chief 7 Figure 2 (b) (C) t→ t→ Figure 4 (a) (b) t→ (d) -

Claims (2)

[Claims] (1) A music-vibration conversion device that includes a vibrator arranged to give vibration to the body and vibrates the vibrator using a drive signal based on a music signal, in which a music signal is input and the music signal is an oscillation circuit that outputs a vibration signal of a predetermined frequency, and a modulation circuit that modulates the amplitude of the vibration signal using the envelope component to obtain the drive signal. Characteristic music-vibration conversion device. (2) In a music-vibration conversion device that includes a vibrator arranged so as to be able to give vibrations to the body and vibrates the vibrator using a drive signal based on a music signal, the input signal includes the human voice. a low-pass filter that extracts a component corresponding to a frequency below the frequency; an envelope component extraction circuit that receives a music signal that has passed through the low-pass filter and extracts an envelope component of the music signal; and an oscillation circuit that outputs a vibration signal of a predetermined frequency; A music-vibration conversion device comprising: a modulation circuit that amplitude-modulates a vibration signal using an envelope component to obtain the drive signal.