JPH0125479B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an acoustic vibration transmission device that extracts a low frequency signal component from an audio signal from an audio device, converts the low frequency signal component into mechanical vibration, and transmits the mechanical vibration to a listener.

Recently, an acoustic vibration transmission device has been proposed, and such a device uses a low-pass filter to extract the low frequency range that is difficult to transmit to the listener using a conventional speaker, amplifies it, and then transmits it to the acoustic vibrator. It converts vibration waves into vibration waves and applies them to the listener's body, allowing the body to feel music, etc. in addition to the normal sound waves perceived by the ears, thereby improving the sense of presence when listening to music. .

However, since the above-mentioned device generates a sense of presence through the auditory sensation from the speaker and the bodily sensation from the vibrating body, consistency with the auditory sensation is important. For example, if different speakers have different reproduction frequency characteristics, the sense of presence will be It is also possible that the sensation becomes weaker. In particular, when the above-mentioned acoustic vibration transmission device is applied to a passenger car, etc., the characteristics of the speakers installed at the front and rear of the passenger compartment generally differ depending on various conditions, so the speakers at the front and rear of the passenger compartment can be switched and separately installed. If the reproducing characteristics of the vibrating body are the same during a reproducing operation, there may be a mismatch between the auditory sensation and the bodily sensation, resulting in a decrease in the sense of presence.

Therefore, in order to prevent the occurrence of such a mismatched state, in the acoustic vibration transmission device, the band of bass vibrations generated by the vibrating body can be changed according to the reproduction characteristics of the speaker used. Configuration required.

In view of the above problems, the present inventors have created the present invention in order to effectively solve the problems.

An object of the present invention is to make it possible to appropriately change the cutoff frequency of a low-pass filter that extracts low frequency range from an acoustic signal according to the reproduction characteristics of a speaker in order to match the physical sensation with the auditory sensation, thereby further improving the sense of presence. An object of the present invention is to provide an acoustic vibration transmission device intended for the following.

Furthermore, it is an object of the present invention to provide a method for switching the speakers and changing the cut-off frequency in a case where a plurality of speakers with different reproduction characteristics are provided and the speakers can be switched to selectively perform the reproduction operation. It is an object of the present invention to provide an acoustic vibration transmission device which is made to work in conjunction with each other and is therefore easy to operate.

A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows the configuration of an acoustic device and an acoustic vibration transmission device. In FIG. 1, an electric signal related to music is generated to a listener 2 seated on a seat 1 by a conventional audio equipment 3 consisting of an amplifier such as a tuner or a cassette tape recorder, and an electroacoustic signal is generated by a speaker 4. A sound wave is obtained by performing the conversion.
On the other hand, electrical signals related to music etc. are separately branched and only the low frequency band is extracted using a low pass filter 5.
This electric signal related to the bass band is amplified by a special low-frequency power amplifier 6, and the amplified electric signal drives the transducer, that is, the acoustic vibrator 7, arranged on the seat 1. Ru. When the vibrating body 7 is driven, a vibration wave is generated, and this vibration wave is directly transmitted to the body of the listener 2 through the cushioned seat part 8 and backrest part 9.

As a result of the above, the listener 2 hears the speaker 4 and the vibrating body 7.
Through this, you can feel music etc. with your ears and with your body,
In particular, the sensation of bass frequencies improves the sense of realism.

In the above, the low-pass filter 5 is configured so that the cut-off frequency can be changed in a plurality of steps, and therefore the acoustic vibration transmission device is equipped with a changeover switch (not shown) having switching steps corresponding to the number of changeable cut-off frequency steps. ) will be provided. Specifically, for example, the cutoff frequency
A changeover switch is proposed that provides three cutoff frequencies, 100Hz, 150Hz, and 200Hz, and can select each cutoff frequency as appropriate.

According to the above, when the frequency characteristics of the speaker 4 differ depending on the diameter, capacity, etc., the cutoff frequency of the low-pass filter 5 is selected according to the frequency characteristic of the speaker 4, and thereby the vibrating body 7, it is possible to change the frequency band of the vibrations and achieve matching with the speaker.

Generally, the cutoff frequency is selected to be low (for example, 100 Hz) for large-diameter speakers, and high (for example, 150 Hz) for small-diameter speakers.

The changeover switch mechanism may be of any type, such as a push button type, a rotary type, or a slide type.

In this way, when the sense of presence changes due to the change of speakers, it is possible to minimize the decrease in the sense of presence. In addition, when the acoustic vibration transmission device is configured as a single product and attached to a conventional acoustic device, the frequency band to be converted into mechanical vibration is determined according to the reproduction frequency characteristics of the speaker included in the acoustic device. Consistency with the audio equipment can always be maintained. Furthermore, the overlapping range of the frequency band reproduced as sound by the speaker and the frequency band reproduced as mechanical vibration by the acoustic vibrator can be appropriately selected according to the listener's preference, responding to a wide range of human tastes. can do.

Next, a second invention that is a further development of the above invention will be explained.

Normally, when a vehicle such as a passenger car is provided with an audio device, speakers are generally arranged at the front and rear of the vehicle interior, and these speakers are configured so that they can perform reproduction operations independently at the front and rear, respectively. The shapes and apertures of the front and rear speakers are different due to differences in mounting location conditions at the front and rear of the vehicle interior, differences in mounting method, etc., and as a result, the reproduction frequency characteristics of the two are generally different.

Therefore, in the configuration shown in Fig. 1, when a general acoustic device is further provided with an acoustic vibration transmission device consisting of a vibrating body installed in a vehicle seat, the acoustic device is installed in the passenger compartment. Since it has two types of speakers with different characteristics, front and rear, and can reproduce independently by switching between the speakers, it is necessary to change the low-frequency vibration band of the vibrating body in accordance with the reproduction frequency characteristics of each speaker. arise.

Therefore, in order to appropriately change the vibration band, an acoustic vibration transmission apparatus as described above is provided with a low-pass filter capable of switching the cut-off frequency as described in the first invention. On the other hand, the audio device itself is also provided with a switching device for operating the two types of speakers at the front and rear of the vehicle compartment separately and independently. Therefore, if the switching of each of the above-mentioned devices is performed simultaneously in conjunction with each other, the operation becomes simple and convenient.

FIG. 2 shows an embodiment of the switching mechanism according to the second invention. 3 in Figure 2 is the audio equipment mentioned above, and 1
It is assumed that 0 is a speaker for the front part of the vehicle interior, and 11 is a speaker for the rear part of the vehicle interior. Speaker 10 is generally a small-diameter speaker, and speaker 11 is a large-diameter speaker. The speakers 10 and 11 are constructed so that they can be operated separately and independently as required, and switches 14 and 15 are provided on each connection line 12 and 13.

On the other hand, on the side of the acoustic vibration transmission device, the connection line branched at point 16 further has a cut-off frequency.
The output terminal of the audio equipment 3 and the low-pass filters 17 and 18 are branched corresponding to the low-pass filter 17 that is 250 Hz and the low-pass filter 18 that is 150 Hz.
are connected to each input terminal. Switches 21 and 22 are provided on connection lines 19 and 20 of each low-pass filter 17 and 18, respectively. Each low pass filter 1
The output ends of 7 and 18 are wired together and are further connected to a special power amplifier 6 and a vibrating body 7 disposed on a seat (not shown) at the next stage.

In the above, the switch 14 and the switch 21 are integrated and can be operated by the common operator 23, while the switch 15 and the switch 22 are integrated and can be operated by the common operator 24. configured to obtain. Also, the controls 23, 2
4 are integrally connected by a connecting member 25 with a rotation center b. According to such a configuration, for example, by pressing the operator 23, the switches 14 and 21 can be turned on in an interlocking manner and the switches 15 and 22 can be turned off at the same time in an interlocking manner. When the operator 24 is pressed, all of the above operations are reversed. In this way, switching between the speakers 10 and 11 in the audio device and switching between the low-pass filters 17 and 18 in the acoustic vibration transmission device can be performed simultaneously with one operation. In particular, since the front speaker 10 is switched to a low-pass filter 17 and the rear speaker 11 is switched to a low-pass filter 18, it is possible to always match the reproduction characteristics of the speaker and the vibrating body, making it possible to listen to music. It is possible to maintain a high sense of realism at all times.

In the illustrated embodiment, two low-pass filters are separately provided, but the filter circuit may be configured to have different element constants.

As is clear from the above description, according to the present invention,
It is possible to change the vibration characteristics of the acoustic vibration transmission device according to the various reproduction characteristics of the speaker, making it possible to match sound and vibration or to make an appropriate combination. You can enjoy the sensation of pleasure.

Furthermore, in the case where an acoustic vibration transmission device whose vibration characteristics can be changed by switching the vibration characteristics is provided in an acoustic device that is equipped with a plurality of speakers having various reproduction characteristics and can reproduce the sound independently by switching between these speakers,
The switching devices of each device are integrated in advance so that they can work together, so that sound and vibration can always be matched and operation can be performed easily.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a schematic diagram showing the electrical configuration of an acoustic device and an acoustic vibration transmission device, and FIG. 2 is a circuit configuration diagram showing a switching mechanism. In addition, in the drawing, 1 is a seat, 3 is an audio equipment, 4,
10, 11 are speakers, 5, 17, 18 are low-pass filters, 7 is a vibrator, 14, 15, 21, 2
2 is an interlocking changeover switch.

Claims (1)

[Claims] 1. A low-frequency signal component is extracted from an audio signal of an audio device via a low-pass filter, this low-frequency signal component is amplified, and then converted into mechanical vibration, and this mechanical vibration is transmitted to a listener. An acoustic vibration transmission device for transmitting and experiencing vibrations, characterized in that a band switching mechanism is provided for changing the cut-off frequency of the low-pass filter to change the passband of a low-frequency signal component extracted from the audio signal. Vibration transmission device. 2. An acoustic vibration transmission device that is attached to an audio device that is equipped with a plurality of speakers with different sound reproduction characteristics and a speaker switching mechanism that selects and switches the speaker to be driven, which transmits a low-pass filter from the audio signal of the audio device. The acoustic vibration transmission device extracts a low-frequency signal component through a filter, amplifies this low-frequency signal component, converts it into mechanical vibration, and transmits this mechanical vibration to a listener to experience it. A band switching mechanism is provided for changing the pass band of the low frequency signal component by switching the cutoff frequency of the speaker, and the band switching mechanism is linked with the speaker switching mechanism to correspond to the low frequency reproduction characteristics of the selectively driven speaker. 1. An acoustic vibration transmission device characterized in that the acoustic vibration transmission device is configured to select a preset passband.