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JPH0385897

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DESCRIPTION JPH0385897
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
background noise generator which provides a low level of noise to a room shielded from outdoor
noise. BACKGROUND OF THE INVENTION With the advancement of technology, soundproofing
equipment in house construction has been improved. Because of this, living indoors. Especially
when you are spending time with a person, it is the present condition that you may even feel
diminished due to the so much quietness. [Problems to be Solved by the Invention] There has
been a problem that it is not easy even if the sound enters the room too much. The present
invention has been made in view of this problem. The present inventor has been conducting
research on "1 / f fluctuation" for many years, and published the article "Biometric information
and 1 / f fluctuation," in the Journal of Applied Physics, pp. 427-435, 1965. The Society of
Mechanical Engineers, in 1984 50, No. 6, Biocontrol and l / r fluctuation are the fluctuations
that give a comfortable feeling to humans, and the reason that 1 / f fluctuations give a feeling of
comfort is the basics of the human body The rhythmic variation is derived from having a 1 / f
spectrum. The present invention has been made based on the above-described research results,
and a low-level background noise generator is provided in the room, and this noise produces 1/0
noise so that the user feels comfortable. It is an object of the present invention to provide an
apparatus for generating background noise in which f fluctuation is provided. [Means for Solving
the Problems] As means for solving the above problems, the present invention comprises an
electrical noise source comprising a power spectrum of 1 / f fluctuation, and a narrow connected
to the output end of the electrical noise source. An electrical filter of variable pass frequency
band comprising an array of a series circuit of a bandpass filter and an amplifier, a speaker
connected to the output of the electrical filter, a microphone for receiving a noise signal from the
speaker, and a signal from the microphone An acoustic spectrum monitor for receiving and
comprising the same narrow band pass filter array as the electric filter, and detecting a shortage
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of power spectrum of each narrow band pass filter output forming the monitor Increase the gain
of the amplifier of the corresponding narrow band pass filter of the above electric filter to correct
the Characterized in that it consists of a control unit having means that. [Operation] According to
the above-described configuration, the present invention allows the room in which the
background noise is transmitted from the speaker to be a space having any acoustic
characteristics, and even if the space temporally fluctuates in characteristics, 1/1. It can be filled
with f-type background noise. In addition, the room can be filled with noise having an arbitrary
spectrum by changing the control characteristic of the control unit.
The construction of an embodiment according to the present invention will now be described
with reference to FIG. In the figure, 1 is an electrical noise source of 1 / f fluctuation, and the
present applicant has disclosed various generation methods in Japanese Patent Application No.
63-193197. As an electrical noise source of the present embodiment, a device formed by
amplifying a 1 / "fluctuation current generated by applying a DC voltage across the solid carbon
resistor is used. As shown in FIG. 2, the electric filter 2 of variable pass frequency band is a series
circuit of a narrow band pass filter F1 of center frequency 11 and an adjustable amplifier A, and
a narrow band of center frequency r. A series circuit of pass filter F2 and gain adjustable
amplifier A2 and a series circuit of narrow band pass filter F7 of center frequency f7 and gain
adjustable amplifier A7 are similarly connected in parallel. The input end is connected to the
electrical noise source 1 and the output end is connected to the speaker 3. The microphone 4
receives the transmission signal from the speaker 3 and is connected to the input end of the
acoustic spectrum monitor 5. The acoustic spectrum monitor 5 has a narrow band pass filter F of
the center frequency す る forming the electric filter 2, a narrow band pass filter F2 of the center
frequency r2, and so on, as shown in FIG. And a parallel connection of a center frequency 17
with a narrow band pass filter F7. The control unit 6 detects the filter which does not output the
power spectrum of a constant value out of the narrow band pass filters F and -Fn which form the
acoustic spectrum monitor 5, and according to the detection unit, In order to correct the
shortage, narrow band pass filters F1 to F7 forming the electric filter 2 have means for
increasing the gain of the amplifiers A and -An connected in series. Next, the operation of this
embodiment will be described. Narrow band filter I in the electric filter 2 The characteristics of F
2... F have the following characteristics if Δf is a narrow pass band. Therefore, Δr-c-r. On the
other hand, since the electrical noise input to the electrical filter 2 is 1 / f fluctuation noise, the
output covering vectors of the narrowband filters F, F,. Therefore, assuming that the gain of each
amplifier of the electric filter 2 is constant, the coverage vectors of the narrow band pass filters F,
F,... F become constant. The power spectrum is distorted due to the acoustic characteristics in the
room, and the output cover vector at the narrow band pass filters F +, Fz... F, which constitute the
acoustic spectrum monitor 5, does not have a constant value.
The control unit 6 detects the non-constant narrow band filters F1 ... F7 in the acoustic spectrum
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monitor 5, and the gain of the amplifiers At, At ... A, in the electric filter 2 corresponding to the
detected narrow band filter Increase By the above-mentioned operation, even if it is a space
having any acoustic characteristic or a space in which the acoustic characteristic temporally
fluctuates, the amplified Nil / fA in the electric filter 2 of the control unit 6 By adjusting the gain,
the room can be filled with noise having an arbitrary spectrum. As described above, the present
invention transmits noise from an electrical noise source from a speaker provided in a room
through an adjustable electric filter with a passband width, and transmits the transmitted noise
signal. Since the signal received by the microphone is analyzed by the acoustic spectrum monitor,
and the amplifier constituting the electric filter is automatically adjusted in accordance with the
analysis work, the following effects can be obtained. (A) Since the background noise of 1 / f type
power spectrum is sent from the speaker provided in the room, even if the outdoor noise is shut
off by the progress of building technology, the uneasy feeling of the mind due to the room being
too quiet There is an effect to be removed. As the background noise from the speaker has 1 / f
type fluctuation, people feel comfortable. Medium) Control to an electrical filter that passes 1 / f
fluctuation electrical noise from the control unit, even if the room is a space with any acoustic
characteristics, and even in a room whose acoustic characteristics fluctuate temporally By
changing the characteristics, the room can be filled with background noise having an arbitrary
spectrum.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a block diagram showing the configuration of an embodiment according to the present
invention, FIG. 2 is a block diagram of an electric filter, and FIG. 3 is a block diagram of an
acoustic spectrum monitor.
1 ··· Electrical noise source of 1 / f fluctuation 2 · · · Electrical filter with variable pass frequency
band · · · · · · · · · · · · · · · · ·
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