JPS6278998A - Sensible acoustic oscillator - Google Patents

Abstract

PURPOSE:To limit the quantity of the information of a sensible acoustic signal and to obtain a good sensible acoustic device by driving an oscillating unit by a pulse and controlling the pulse duration of a driving pulse in accordance with a signal level. CONSTITUTION:Among audio signals supplied from a prescribed signal source, only low sound area component passes through and LPF (low pass filter) 6. The low sound area signal passing through the LPF 6 passes through a non- inversion amplifier 7 and an inversion amplifier 8, thereafter is added in an adder 9 and thereby conducted out as the absolute value signal of the low sound area component. The output signal of the adder 9, namely, the low sound area absolute value signal is supplied to a comparator 10 and a pulse generating circuit 11. The comparator 10, when the signal level of the low sound area signal (a) is higher than a prescribed reference level Vref, generates the output (b) of high level. From the pulse generating circuit 11, the pulse signal (d) of a pulse duration corresponding to the signal level of the low sound area signal (a) is generated in response to the comparison output (b) of the comparator 10, and oscillating units 3a, 3b are driven.

Description

[Detailed description of the invention] The present invention relates to a sensory acoustic vibration device.

The Flame LLL sensory acoustic vibration device not only provides acoustic effects through acoustic devices that transmit musical sounds through air propagation, such as speakers, but also enhances the sense of presence by converting low-frequency electrical signals into mechanical vibrations and allowing the user to directly experience the vibrations. This is what we are trying to do.

By the way, the human vibration sense has a significantly lower 1ift degree for frequency changes than the auditory sense, so if an acoustic signal with complex frequency components is directly applied to the human body, it may feel like there is too much redundant information. There is.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned points, and by pulse-driving the vibration unit i.
It is an object of the present invention to provide a sensory acoustic vibration device that makes it possible to limit the information j in No. 8.

The sensory acoustic vibration device according to the present invention generates a pulse signal based on the comparison result of the bass signal level with respect to a predetermined reference level, determines the pulse width of the pulse signal according to the bass signal level, and generates the pulse signal. The structure is such that the vibration unit converts the vibration into the vibration of the hoe machine.

Large l” Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

In FIG. 1, a frame portion (firstly, a cushion 2a which is supported by a seat 2 and which forms a seat portion of this seat 2) is shown.
Vibration units 3a and 3b are provided inside the cushion 2b forming the backrest portion, respectively. As the vibration units 3a and 3b, for example, those having a well-known configuration are used, in which the voice coil side is fixed and a magnetic circuit section, which is a driver unit, is reciprocated in response to a drive signal to generate mechanical vibrations. Cushion 2b
A pair of left and right speakers 4a and 4b are built into the headrest 2c provided above. These speakers 4
a, 4b and the vibration unit 3a.

3b and e′? A drive system is built into the control box 5.

FIG. 2 shows a block diagram of an embodiment of the drive system of the vibration units 3a and 3b, in which only the low frequency component of the audio signal supplied from a predetermined signal source (not shown) is shown. It passes through an LPF (low pass filter) 6.

The low frequency signal that has passed through the LPF 6 passes through a non-inverting amplifier 7 and an inverting amplifier 8, and is added in an adder, thereby being derived as an absolute value signal of the low frequency component. As the non-inverting amplifier 7, the inverting amplifier 8, and the adder 9, well-known configurations using operational amplifiers or the like may be used.

The output signal of the adder 9, ie, the low frequency absolute value signal, is supplied to a comparator 10 and a pulse generation circuit 11. As shown in FIG. 4, the comparator 10 receives a low frequency signal <a>
When the No. 42 level of ycr exceeds the predetermined reference level, a high level output (b) is generated.

As shown in FIG. 3, the pulse generating circuit 11 includes an operational amplifier OP+, resistors R+, R2, and a capacitor C1, and includes a differentiating circuit 12 for differentiating a low frequency signal, an operational amplifier OP2, a Zener diode ZD, and resistors R3 and R4.
It consists of a zero level comparator 13 which operates by detecting the zero level of the differential output, and an AND gate 14 which inputs each output of the zero level comparator 13 and the above-mentioned comparator 10 by two people.

In the pulse generating circuit 11 having such a configuration, the zero level comparator 13 outputs a high level output (C) during a period in which the signal (a) has a positive slope with respect to the low frequency signal as shown in FIG. 4(a). will occur. As a result, A
The output terminal of the ND gate 14 receives the signal (a) from the moment the low frequency signal (a) exceeds the predetermined level Vref.
A high level output pulse (d) is derived until the peak value in the positive direction is reached, and the pulse width of this output pulse (d>) corresponds to the signal level of the bass range signal (a). However, the pulse generating circuit 11 responds to the comparison output (b) of the comparator 10 to generate the low frequency range No. 18 (
A pulse signal (d) with a pulse width corresponding to the signal level of a)
) is generated. This pulse signal (d) is supplied to vibration units 3a, 3b (shown in FIG. 1) via a BPF (band pass filter) 15, and drives the units 1-3a, 3b.

Note that audio signals are directly supplied to the speakers 4a and 4b via the amplifier 20.

In this way, by pulsing the low frequency signal and driving the vibration unit 38.3b based on this pulse signal, it is possible to limit the amount of information of the acoustic signal given to the human body through bodily sensation, and eliminate redundant information. It no longer feels like it's too much.

In addition, the pulse width of the pulse signal is determined and reversed depending on the signal level, so that when the signal level is high, a pulse signal with a wide pulse width is output, and when the acoustic signal level is low, a pulse signal with a narrow pulse width is output. So,
The perceived vibration energy is large when the pulse width is wide;
When the pulse width is narrow, it becomes small, and it is possible to give an intense sensation (vibration) according to the 7a 'II signal level.Furthermore, in FIG. The state of the bodily sensation of vibration can also be changed by changing these factors.

Note that the pulse generating circuit 11 is not limited to the configuration shown in FIG. Depending on the level, change the time constant to t! It is also possible to use a configuration such as 11211.

As explained above, according to the sensory acoustic vibration device according to the present invention, the vibration unit can be pulse-driven! IIIJ? F′ru“
In addition, since the pulse width of the driving pulse is controlled according to the signal level, the amount of information of the acoustic signal that can be sensed by the body can be limited, and the sound e device that can be sensed by the body can be achieved.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the configuration of a sensory acoustic vibration device, FIG. 2 is a block diagram showing an embodiment of the present invention, FIG. 3 is a circuit diagram showing an example of the pulse generation circuit in FIG. 2, and FIG. The figure is an operation waveform diagram of the M3 diagram. Explanation of symbols of main parts 3a, 3b... Vibration unit 6...
Low-pass filter 10...Comparator

Claims (1)

[Claims] a low-pass filter that allows low frequency components of an input signal to pass; a comparison unit that compares an output level of the low-pass filter with a predetermined reference level; and a pulse generation unit that generates a pulse signal in response to a comparison output of the comparison unit; A vibration unit that converts the pulse signal into mechanical vibration, and the pulse generating means generates a pulse signal with a pulse width corresponding to an output level of the low-pass filter.