JPH08329040A - Sound environment simulator - Google Patents

Abstract

PURPOSE: To simulate and hear a sound after noise countermeasures are taken by performing convolutional operation for respective signals of noises or vibrations detected at plural points by a filter which shows spatial transmission characteristics based upon the contribution rate of a contribution rate analyzing means and reproducing a noise detected at a noise evaluation point. CONSTITUTION: Information on the noise or vibration of equipment l which generates the noise is detected by sensors 2a, 2b, and 2c. The contribution rate analyzing means 4 performs the convolutional operation with a filter coefficient to analyze the contribution rates showing how much the detection signals of the sensors 2a, 2b, and 2c contribute to a microphone installed at the evaluation point at a constant distance from the equipment 1. The contribution rates are distributed to the detection signals of the sensors 2a, 2b, and 2c, and the noise at the evaluation point is synthesized by a sound synthesizing means 5 and outputted to speakers 6a and 6b. Consequently, the sound after noise countermeasures are taken can be simulated and heard.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound environment simulator for reproducing and synthesizing sounds.

[0002]

2. Description of the Related Art Conventionally, research has been conducted on a sound environment simulator for synthesizing the sound environment of each sound field such as a concert hall, a studio, etc. based on design data and experiencing it. Such studies have been carried out, for example, in JP-A-5-73081 and JP-A-373081.
-38695 and Japanese Patent Laid-Open No. 3-15896. These sound environment simulators use the acoustic characteristics from the sound source to the sound receiving point as design data, and simulate the sound field itself based on it.

Further, there has been proposed a method for diagnosing the contribution of a sound source or a vibration source by examining the degree of influence of the sound source or the vibration source by measuring the noise or vibration of equipment or the like. An example of the proposal is Japanese Patent Laid-Open No. 5-267.
No. 22 publication is cited. This analyzes the degree to which the sound source or the vibration source contributes to the sound or the vibration at the evaluation point.

Further, in order to evaluate the noise generated from the equipment or the like, the actual noise level of the product is measured in an anechoic room or the like, and then evaluated.

[0005]

In order to reduce the noise level of equipment such as air conditioners and home appliances, it is necessary to evaluate the noise generated from the equipment in the environment in which the equipment is actually used, that is, in the actual environment. There is. However, as described above, the sound environment simulator uses the acoustic characteristics from the sound source to the sound receiving point as design data, and simulates the sound field itself based on it, and is generated from air conditioners, home appliances, etc. It does not simulate the noise generated.

Further, the noise evaluation is performed only in the anechoic room or the like using only the physical quantity of the noise level evaluation, and not in the actual environment, and the contribution rate analyzing means and the sound synthesizing means are combined to produce a product such as a device. There was no sound environment simulator that could simulate sound in a real environment.

An object of the present invention is to synthesize a product sound from a sound source separated by a contribution rate analyzing means by a sound synthesizing means, and a product developer can simulate the product sound in an actual environment so that the product sound can be evaluated. The aim is to obtain a sound environment simulator in which the subsequent sounds can also be sampled.

[0008]

In order to achieve the above object, the present invention inputs sound or vibration signals detected at a plurality of points in the vicinity of a device having a composite sound source into an adaptive filter. , So that the error between the sum of the output signals of the adaptive filter and the sound or vibration signal detected at the evaluation point for evaluating noise or vibration is minimized,
Contribution rate for obtaining the contribution rate of the sound or vibration at the plurality of points to the sound or vibration at the evaluation point by updating the coefficient of the adaptive filter and using the output signal of each adaptive filter when it converges to a constant value It is characterized by comprising an analyzing means and a sound synthesizing means for simulating the noise generated from the device or the like by using the contribution rate obtained by the contribution rate analyzing means.

[0009]

As described above, in the sound environment simulator of the present invention, by combining the contribution rate analyzing means and the sound synthesizing means, it is possible to simulate the noise generated from the equipment or the like in an actual environment.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is an explanatory diagram of the overall configuration of a sound environment simulator according to the present invention. The sound environment simulator shown in the figure is a sensor 2a, 2b, 2c such as a microphone that obtains information on noise or vibration of the device 1 that generates noise.
And a microphone 3 installed at an evaluation point which is apart from the device 1 by a certain distance (near human ears), and sensors 2a, 2b,
A contribution rate analyzing means 4 for analyzing how much the signal detected by 2c contributes to the microphone 3;
The contribution rate and the like obtained by the contribution rate analysis means 4 are measured by the sensors 2a, 2
A sound synthesizing means 5 for synthesizing the noise detected at b and 2c and synthesizing the noise at the evaluation point, and speakers 6a and 6b for outputting the synthesized sound are provided.

FIG. 2 shows a block diagram of the sound environment simulator.

In the contribution rate analyzing means 4, the sensors 2a, 2
The signals as noise or vibration information obtained at b and 2c and the noise signal obtained at the microphone 3 are input to a low-pass filter and further input to an A / D converter, and digital signals x1, x2, x3, and d are input. Is converted to. The digital signals x1, x2 and x3 based on the sensors 2a, 2b and 2c are respectively applied to the adaptive digital filter 4
1, 42, 43, and convolution calculation with the filter coefficient is performed to generate output signals y1, y2, y3. Next, the coefficients of the adaptive digital filters 41, 42, 43 are set so that the difference between the sum of the output signals y1, y2, y3 and the digital signal d based on the signal obtained by the microphone installed at the evaluation point is minimized. I will update. When the coefficient of the adaptive digital filter converges to a constant value by repeating the above operation, each adaptive digital filter output y1, y
From 2 and y3, the contribution rate of noise or vibration in each sensor to the evaluation point is analyzed.

In the sound synthesizing means 5, the contribution rate obtained by the contribution rate analyzing means 4 is converted into a digital signal x based on each sensor.
1, x2, x3 are respectively distributed by the contribution ratio distributor 50, and the respective adaptive digital filter coefficients at the time of convergence obtained by the contribution ratio analyzing means 4 are digital filters 51, 52, 5
Copy to 3. The output signals of the contribution rate distribution circuit 50 and the digital filters 51, 52 and 53 are convolved to output digital signals s1, s2 and s3, and a combined signal s is created by summing these signals.

Further, the transfer characteristics in a space having various transfer characteristics (reverberation characteristics, etc.) are measured, and various transfer characteristics are called from the storage medium 54 stored in the form of a database to obtain the combined signal s. Convolution operation of
A convolution operation is performed with the inverse filter 55 representing the inverse transfer characteristic from the speaker 6 to the person to be evaluated or the dummy head 7 in the room for reproducing the synthetic sound, and the operation result is D / A.
By converting the analog signal with the converter and outputting it from the speaker 6, the product sound in a space having various characteristics can be reproduced.

Further, a contribution rate distribution circuit 50, based on a physical evaluation or a sensory evaluation by a human or dummy head 7,
Alternatively, by manually operating the coefficients of the digital filters 51, 52, 53, etc., it is possible to listen to the sound of the product 1 when the antivibration and sound insulation measures are taken.

The present invention can also be applied to general equipment that generates noise, such as vacuum cleaners, air conditioners, and vehicles. Further, the number of sensors, speakers, and the like for obtaining noise or vibration information can be increased.

[0018]

According to the present invention, it is possible to simulate noise generated from a device or the like in an actual environment. As a result, the product developer can listen to the simulated sound of the product, take noise countermeasures accordingly, and also predict and listen to the sound after the countermeasure, so that the time spent for silent development of the product can be reduced.

[Brief description of drawings]

FIG. 1 is an overall system diagram of the present invention.

FIG. 2 is a block diagram showing details of FIG.

[Explanation of symbols]

1 ... Equipment generating noise, 2a, 2b, 2c ... Sensor,
3 ... Microphone (evaluation point), 4 ... Contribution rate analysis means,
5 ... Sound synthesizing means, 6a, 6b ... Speakers, 7 ... Dummy head.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI Technical indication location // G01S 7/52 8907-2F G01S 7/52 U (72) Inventor Katsuo Oki Tsuchiura City, Ibaraki Prefecture 502 Kintatemachi, Institute of Mechanical Research, Hiritsu Seisakusho Co., Ltd. (72) Yoshinote Ota, 502, Kintatemachi, Tsuchiura City, Ibaraki Prefecture, Japan Address In the Institute of Mechanical Research, Hiritsu Manufacturing Co., Ltd. (72) Inventor Toshio Suzuki 5-34, Nakagawa 5-chome, Adachi-ku, Tokyo Stock company Hitachi Living Software Development Center

Claims (6)

[Claims] 1. A sound environment simulator simulating noise generated from a device, wherein noise or vibration signals detected at a plurality of points around the device are detected at a noise evaluation point installed at a position other than the plurality of points. And a convolution calculation for each noise or vibration signal detected at the plurality of points and a filter representing a spatial transfer characteristic based on the contribution rate to perform a convolution calculation, and the noise evaluation point. And a sound synthesizing means for reproducing the noise detected by the sound environment simulator. 2. A sound environment simulator for simulating noise generated from a device, wherein each signal of noise or vibration detected at a plurality of points around the device is input to an adaptive filter, and the output signal of the adaptive filter is input. And the error of the sound or vibration signal detected at the evaluation point for evaluating the noise is minimized, the coefficient of the adaptive filter is updated, and the adaptive filter of each of the adaptive filters when converged to a constant value. Using the output signal, a contribution rate analyzing unit that obtains a contribution rate of the sound or vibration at the plurality of points to the sound at the evaluation point, and the contribution rate to each signal of noise or vibration detected at the plurality of points. And a sound synthesizing unit for performing a convolution operation and reproducing the noise detected at the noise evaluation point. Sound environment simulator which is characterized. 3. The sound environment simulator according to claim 1, further comprising contribution rate adjusting means for changing the contribution rate obtained by the contribution rate analyzing means at a predetermined rate. 4. The sound environment simulator according to claim 2, further comprising means for changing the adaptive filter coefficient converged to a constant value obtained by the contribution rate analyzing means. 5. The sound environment simulator according to claim 1, further comprising means for storing the transmission characteristics of the space obtained by the contribution rate analyzing means according to a predetermined ratio changed by the contribution rate adjusting means. 6. The sound environment simulator according to claim 1, further comprising means for storing the acoustic characteristics of various rooms in a database.