JPH07176956A - Fluctuation signal generator - Google Patents

Abstract

PURPOSE:To generate a fluctuation signal whose characteristic is simply changed. CONSTITUTION:A signal sin(0.2pit+theta1) is generated from an oscillator 111, an oscillator 112 generates a signal 0.5sin(0.1pit+theta2) an oscillator 113 generates a signal 0.25sin(0.5pit+theta4), an oscillator 114 generates a signal 0.125sin(0.25pit+theta8), and an oscillator 115 generates a signal 0.0625sin(0.125pit+theta16), and the initial phases theta1, theta4, theta8, theta16 are generated based on random numbers. The sine wave signals are added by an adder circuit 12 to obtain a signal having a characteristic of 1/f as a fluctuation signal. Other fluctuation characteristic is obtained by changing the amplitude of the sine wave signals.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for generating a fluctuation signal for controlling the wind speed of an electric fan, the air volume of an air conditioner, the temperature, or the brightness of a dimmer.

[0002]

2. Description of the Related Art For humans, it is better for the wind speed of an electric fan, the air flow rate or temperature of an air conditioner, or the brightness of a lighting device to fluctuate to some extent around the set value than it is. It is close to the natural environment. For this reason, it has been proposed to control such various devices with a fluctuation signal so as to control them with some fluctuation with respect to a set value.

The spectrum of variation rooted in the nature of nature is 1
The / f type tendency is shown. Therefore, for example, if the air volume of the fan or the temperature of the air conditioner is modulated with the power spectrum of 1 / f, an environment that is naturally familiar is created. Conventionally, to control fluctuations of various devices in this way, for example, the sound of nature such as the stream of the stream, the sound of the wind and the wind speed of the natural world, the biological information such as heartbeat and brain waves, and classical music are converted into electric signals. The number of 0 crossings per unit time was calculated and used as 1 / f data. Alternatively, in order to artificially obtain the 1 / f characteristic, a low-pass filter and a wide-pass filter are combined with respect to white noise to attenuate the power of a specific frequency band to 1 / f.
Some have obtained frequency characteristics similar to the f characteristics.

[0004]

As described above, when using sounds in the natural world, etc., these sounds are temporarily stored in some storage medium and recorded, and then the recording is read out and the 1 / f characteristic is read. Need to be made, and it was very time-consuming and expensive to make this fluctuation signal. On the other hand, in the case of artificially generating the 1 / f characteristic, if the characteristic is to be changed, the hardware configuration must be changed and the specifications must be changed each time, which is inconvenient.

[0005]

According to the present invention, at least two sine wave signals whose frequencies are substantially positive multiples are generated from the sine wave generating means, and these sine wave signals are added by an adding circuit. , Is output as a fluctuation signal.

[0006]

FIG. 1 shows an embodiment of the present invention. To this invention
In addition, a plurality of sine wave oscillators 11 ₁Through 11_NIs provided
These sine wave oscillator 11₁Through 11_NTo g₁= A
₁sin (2πft + θ₁), G₂= A₂sin (4πft
+ Θ₂) ..... g_N= A_Nsin (2Nπft + θ_N)But
These sine wave oscillators 11 are generated respectively.₁Through 11
_NSinusoidal signal g from₁To g_NIs in the adder circuit 12
Are added together and output as a fluctuation signal f (t).

F (t) = Σg _n = ΣA _n sin (2nπft + θ _n ) ... (1) Σ is from n = 1 to N. Specifically, in the fluctuation function of the equation (1), for example, The frequency f _{1 is set} to 0.1 Hz, and its second, fourth, eighth and sixteenth harmonics, that is, f ₂ = 2f ₁ , f ₄
= 4f ₁ , f ₈ = 8f ₁ , f ₁₆ = 16f ₁ is generated 5
When two sine wave oscillators are provided and generate 1 / f fluctuation, the amplitude A ₁ = 1V of each sine wave signal g ₁ ,
_{A 2 = 0.5V (= A 1} /2), A 4 = 0.25V (=
_{A 1/4), A 8} = 0.125V (= A 1/8), A 16
= And _{0.0625V (= A 1/16)} , each of the initial phase _{θ 1, θ 2, θ 4} , θ 8, θ 16 shall be determined by random numbers. Therefore, at this time, the fluctuation signal becomes as follows.

F (t) = sin (0.2 πt + θ ₁ ) + 0.5sin (0.1 πt + θ ₂ ) + 0.25sin (0.15 πt + θ ₄ ) + 0.125sin (0.25πt + θ ₈ ) + 0.0625sin (0.125πt + θ ₁₆ ) This fluctuation signal is The waveform is as shown in FIG. The maximum amplitude of this fluctuation signal is A ₁ + A ₂ + A ₄ + A ₈ + A ₁₆
And the repetition cycle is 0.1 Hz (= f ₁ ),
It is understood that 1 / f fluctuations can occur. In this embodiment, in order to shorten the calculation time, the third, fifth, sixth, seventh, ninth, tenth, eleventh, twelfth, thirteenth, fourteenth,
Although the fifteenth harmonic sine wave signal generator is omitted, it goes without saying that these generators may be added. If the fluctuation period is desired to be sufficiently long, the frequency of f ₁ may be further lowered. However, when the generation of the fluctuation waveform of one cycle is finished, the phase of each oscillator may be newly changed by a random number to generate a fluctuation waveform signal of another pattern, and a fluctuation waveform without repetition is generated. It is also possible.

Further, without providing such individual sine wave oscillators, these may be generated as digital signals by a program by a computer, respectively. As described above, the fluctuation generating device 21 is configured by the microcomputer including the CPU, the ROM, the RAM, and the input / output unit as shown in FIG. 3, and the fluctuation signal generated from the fluctuation generating device is supplied to the phase control circuit 22. The brightness of the light bulb 23 is changed by controlling the flow angle of the commercial AC 100V by the fluctuation signal and controlling the current flowing through the light bulb 23 by the output of the phase control circuit 22.
In other words, it is possible to control the light in a fluctuating state by dimming.

In the above, the amplitude A _n = (1 / n) A
As _1, but to obtain a fluctuation signal of _{1 / f, A n = (} 1 /
If n ² ) A ₁ then a fluctuation signal of (1 / f) ² is obtained, or if A _n = (1 / √n) A _{1 then} 1 / √
f Fluctuations.

[0011]

As described above, according to the present invention, a plurality of sinusoidal waves are generated and a fluctuation signal is generated by combining the sinusoidal waves, so that recording is performed as compared with the case of using natural sounds. In addition, there is no need to reproduce, and it can be constructed at low cost with no trouble. The characteristics can be changed easily by changing parameters such as frequency, amplitude, phase, and the number of sine wave occurrences. For example, 1 / f fluctuation, 1 / f
² fluctuations, 1 / √f fluctuations, etc. can be easily generated, and there is no need to change the hardware each time.

[Brief description of drawings]

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

FIG. 2 is a diagram showing a waveform of a fluctuation signal generated by the embodiment.

FIG. 3 is a block diagram showing an example of an apparatus using the present invention.

Claims (1)

[Claims] 1. A sine wave signal generating means for generating at least two sine wave signals having a frequency that is approximately a positive multiple of the fundamental wave, and the sine wave signals generated by these sine wave signal generating means are added. A fluctuation signal generating device, comprising: an addition unit that outputs a fluctuation signal.