JP2957725B2 - Physical quantity control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for controlling a physical quantity such as an air volume in a blower and a vibration in a massager.

[0002]

2. Description of the Related Art A change in the amount of stimulus to a living body, such as the amount of air blown by a blower or the vibration of a massager, is preferably changed to a frequency characteristic having fluctuation having a spectrum inversely proportional to the frequency f (hereinafter referred to as 1 / f fluctuation). It is known that a feeling can be obtained.

[0003] Regarding this concrete realization method,
For example, Japanese Patent Application Laid-Open No. 2-44693 (International Patent Classification H
O5B 37/02), JP-A-2-57004 (International Patent Classification HO3B 29/00), JP-A-2-5704
No. 100702 (International Patent Classification GO5B 19 /
02).

[0004]

The power spectrum of the 1 / f fluctuation has only the amplitude information of the original waveform, and even if given, the original waveform cannot be reproduced. In other words, the waveforms having the same 1 / f fluctuation characteristic have an infinite number of original waveforms. These are due to differences in the phase relationship between the harmonics and further due to differences in the highest harmonic order.

[0005] The change in the amount of stimulus caused by these various original waveforms greatly varies in personal preference. However, in the conventional example,
Japanese Patent Application Laid-Open No. 2-44693 and Japanese Patent Application Laid-Open No.
In the Japanese Patent Publication No.
Only the fact that this is / f fluctuation is described.

Japanese Patent Laid-Open No. 2-100702 discloses a method of switching power spectrums having different power spectra over time, but does not mention switching of power spectrums having the same power spectrum.

[0007] The 1 / f fluctuation gives a feeling of comfort to a human being. It is desirable to select the 1 / f fluctuation that suits the individual's preference even with the same 1 / f fluctuation. As described above, the prior art does not consider this point.

[0008] By the way, the method of generating the 1 / f signal includes, for example, as disclosed in Japanese Patent Application Laid-Open No. 2-57004.
There are a method of amplifying the fluctuation of the resistance value, so-called flicker noise, and a method of storing 1 / f fluctuation data in a ROM or the like in advance and sequentially extracting the data.

In the former method, since the original signal of 1 / f is small, a large-scale amplifier circuit is required and it becomes expensive. On the other hand, the latter method is relatively inexpensive and can be easily experimented with. However, since the amount of data that can be stored is limited, it is difficult to accurately reproduce a waveform and periodicity occurs.

It is an object of the first physical quantity control device of the present invention to provide a physical quantity control device capable of selecting 1 / f fluctuation according to personal preference.

An object of the second physical quantity control device of the present invention is to provide an inexpensive physical quantity control device capable of accurately reproducing waveforms.

[0013]

A first physical quantity control device according to the present invention is a device for controlling a physical quantity such as an air volume in a blower and a vibration in a massager based on a 1 / f fluctuation signal. Phase relation switching means for switching the phase relation of each harmonic, highest harmonic order switching means for switching the order of the highest harmonic with respect to the fundamental wave component of the 1 / f fluctuation signal, and each harmonic switched by the phase relation switching means. A 1 / f fluctuation signal generating means for generating a 1 / f fluctuation signal based on the phase relationship and the highest harmonic order switched by the highest harmonic order switching means is provided.

[0014] The second physical quantity control device according to the present invention comprises:
Storage means for storing the 1 / f fluctuation data in advance, D / A conversion means for D / A converting the 1 / f fluctuation data stored in the storage means, and removal of high frequency components from the output signal of the D / A conversion means A low-pass filter is provided.

[0015]

In the first physical quantity control device according to the present invention, 1
Since the phase relationship and the highest harmonic order of each harmonic of the / f fluctuation signal can be selected, it is possible to select 1 / f fluctuation that suits personal preference.

That is, a waveform having 1 / f fluctuation is represented by the following equation (however, the coefficient of the fundamental wave is 1).

[0017]

(Equation 1)

According to Equation 1, the waveform f (t) having the 1 / f fluctuation can be easily calculated by a computer or the like.
The phase αk of each frequency component can be changed using, for example, a random number generation function of a computer. In particular, in BASIC or the like, an arbitrary random number sequence can be obtained by designating a so-called “seed of random numbers”, and the phase relationship between each harmonic can be changed. Further, by changing the highest harmonic order n, the highest harmonic order with respect to the fundamental wave can be changed.

In the second physical quantity control device according to the present invention, the harmonic component of the 1 / f fluctuation signal is removed by the low-pass filter, so that the same effect as the increase in the number of data can be obtained.

[0020]

FIG. 1 shows a first embodiment of the present invention. In FIG. 1, a plurality of random number series data (phase data) for determining a phase relationship between harmonics is stored in a phase data storage ROM 1, and an order of the highest harmonic with respect to a fundamental wave is determined in an order data storage ROM 2. A plurality of data (order data) are stored. And each ROM
The data stored in 1 and 2 are selected by SW1 and SW2 and input to the computer 3.

The computer 3 calculates 1 / f based on the phase data and the order data selected by the switches SW1 and SW2.
Generate a fluctuation waveform.

The 1 / f fluctuation waveform output from the computer 3 is D / A converted by the D / A conversion circuit 4 and then sent to the device 6 via the control circuit 5.

The phase data and the order data may be directly inputted from the keyboard 7 of the computer 3 as shown in FIG.

Further, the plurality of 1 / f data created by the computer 3 may be stored in a storage device such as a ROM in advance, and the 1 / f data may be switched by a switch or the like.

FIG. 3 shows a waveform when the fundamental frequency is 0.01 Hz and the highest harmonic number is 20. FIG. 4 shows a power spectrum thereof.

FIG. 5 shows a waveform when only the phase relation is changed from the waveform of FIG. 3 to another series, and FIG. 6 shows the power spectrum.

FIG. 7 shows a waveform when only the highest harmonic is 50th order from the waveform of FIG. 3, and FIG. 8 shows its power spectrum.

Although the waveform of FIG. 3 is different from the waveform of FIG.
It is exactly the same as shown in FIG. 6 and FIG.

Although the waveforms of FIG. 3 and FIG. 7 are also different, the power spectrum is 0.2 Hz and 0.2 Hz at the cut-off frequency as shown in FIG. 4 and FIG.
There is only a difference from 5 Hz, and the slope is the same.
/ F fluctuation.

FIG. 9 shows a second embodiment of the present invention.

In FIG. 9, the ROM 11 stores 1 / f fluctuation data created by any method. This data output is converted into analog data by the D / A conversion circuit 12. FIG. 10 shows the output waveform of the D / A conversion circuit 12.

The power spectrum of this output waveform deviates from the 1 / f characteristic shown by the broken line as shown by the solid line in FIG. 11 due to waveform distortion.

The output of the D / A conversion circuit 12 is sent to a low-pass filter 13, where harmonic components are removed. The output waveform of the low-pass filter 13 has a waveform as shown in FIG. 12, and its power spectrum has a 1 / f fluctuation as shown in FIG.

The output of the low-pass filter 13 is amplified by an amplifier circuit 14 and then sent to a stimulator.

By passing the output of the D / A conversion circuit 12 through the low-pass filter 13, the characteristic of FIG. 10 becomes the characteristic of FIG. 12, which means that the number of 1 / f fluctuation data stored in the ROM 11 is substantially reduced. The same effect can be obtained as when the number is increased. One cycle time can be lengthened with the same number of data, and repeatability can be reduced.

[0036]

According to the first physical quantity control device of the present invention, it is possible to select a fluctuation suitable for each person's preference even in the fluctuation having the same 1 / f fluctuation frequency spectrum. According to the second physical quantity control device according to the present invention,
The same effect as increasing the number of data stored in a storage means such as a ROM for storing 1 / f fluctuation data can be obtained, and the time of one cycle can be extended with the same number of data, thereby reducing repeatability. .

[Brief description of the drawings]

FIG. 1 is an electric block diagram showing a first embodiment of the present invention.

FIG. 2 is an electric block diagram showing a modification of the first embodiment of the present invention.

FIG. 3 is a waveform diagram showing a 1 / f fluctuation waveform.

FIG. 4 is a spectrum diagram showing a power spectrum of the waveform of FIG. 3;

FIG. 5 is a waveform diagram showing a 1 / f fluctuation waveform.

FIG. 6 is a spectrum diagram showing a power spectrum of the waveform of FIG. 5;

FIG. 7 is a waveform chart showing a 1 / f fluctuation waveform.

FIG. 8 is a spectrum diagram showing a power spectrum of the waveform of FIG. 7;

FIG. 9 is an electric block diagram showing a second embodiment of the present invention.

FIG. 10 is a waveform chart showing an output waveform of the D / A conversion circuit.

FIG. 11 is a spectrum diagram showing a power spectrum of an output waveform of the D / A conversion circuit.

FIG. 12 is a waveform diagram showing an output waveform of a low-pass filter.

FIG. 13 is a spectrum diagram showing a power spectrum of an output waveform of a low-pass filter.

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Yoshihiro Nomura 2-18 Keihanhondori, Moriguchi City Sanyo Electric Co., Ltd. (56) References JP-A-62-87165 (JP, A) Patent 2749924 (JP, B2) Japanese Patent Publication No. 3-35930 (JP, B2) Japanese Patent Publication No. 3-42092 (JP, B2) (58) Fields investigated (Int. Cl. ⁶ , DB name) G05B 19/00-19/02 G05B 24 / 02

Claims (2)

(57) [Claims] 1. An apparatus for controlling a physical quantity such as an air volume in a blower and a vibration in a massager based on a 1 / f fluctuation signal, wherein a phase relation switching means for switching a phase relation of each harmonic of the 1 / f fluctuation signal, f Highest harmonic order switching means for switching the order of the highest harmonic with respect to the fundamental component of the fluctuation signal, and the phase relationship of each harmonic switched by the phase relationship switching means and the highest harmonic switched by the highest harmonic order switching means A physical quantity control device comprising 1 / f fluctuation signal generating means for generating a 1 / f fluctuation signal based on a wave order. 2. A storage means for storing 1 / f fluctuation data in advance, a D / A conversion means for D / A converting the 1 / f fluctuation data stored in the storage means, and a signal output from the D / A conversion means. A physical quantity control device including a low-pass filter that removes high-frequency components.