JP2001238298A - Sound image localization device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sound image localization device that can analyze and set a delay time of each speaker system in response to ambient temperature so as to provided a localized sound image to a prescribed sound image position even when the ambient temperature is subjected to change. SOLUTION: The sound image localization device is provided with a main speaker S1, an auxiliary speaker S2, a sound volume adjustment means 2 that sets a sound volume of an acoustic signal outputted from a sound source 1 by each of the main speaker S1 and the auxiliary speaker S2, and a delay time adjustment means 3 that sets a delay time of the acoustic signal outputted from the sound volume adjustment means 2 by each of the main speaker S1 and the auxiliary speaker S2. The delay time adjustment means 3 is configured to set the delay time of the auxiliary speaker S2 with respect to the main speaker S1 depending on the distance up to a prescribed sound receiving point and the ambient temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound image localization apparatus for providing a sound image localized at a predetermined sound image position in audio equipment such as an outdoor facility.

[0002]

2. Description of the Related Art Conventionally, in audio equipment such as an indoor hall or an outdoor facility, an auxiliary speaker is arranged in addition to a main speaker so that a sound pressure level at a predetermined sound receiving point is constant. A predetermined sound pressure level has been obtained by controlling the sound pressure level and the delay time of the output sound signal.

[0003]

Since the speed of sound depends on the ambient temperature, the delay time of the acoustic signal of each speaker system to be set in an acoustic facility such as an outdoor facility is adjusted according to the ambient temperature. It is necessary to perform sound image localization for each sound receiving point.

[0004] However, conventionally, a delay time is set at the time of sound adjustment and registered in a pattern, but does not follow a change in sound speed due to a temperature change. This is because in order to set the delay time corresponding to the temperature change, it is necessary to perform adjustment for an arbitrary temperature, and it is difficult to perform adjustment for each arbitrary temperature. For this reason, conventionally, the accuracy of sound image localization tends to decrease.

The present invention has been made to solve such a conventional problem, and provides a sound image localization apparatus which can provide a localized sound image at a predetermined sound image position even when the ambient temperature changes. Is to do.

[0006]

A sound image localization apparatus according to the present invention comprises: a main speaker and an auxiliary speaker; volume control means for setting the volume of an audio signal output from a sound source for each of the main speaker and the auxiliary speaker; Delay time adjusting means for setting a delay time of an audio signal output from the means for each of the main speaker and the auxiliary speaker, wherein the delay time adjusting means adjusts a delay time of the auxiliary speaker with respect to the main speaker to an ambient temperature and a predetermined sound receiving point. It has a configuration to be set according to the distance to.

With this configuration, the delay time of the audio signal output from the auxiliary speaker with respect to the audio signal output from the main speaker is set according to the ambient temperature. The localized sound image is continuously provided.

Further, the sound image localization apparatus of the present invention has a configuration in which the delay time adjusting means stores a delay time for each ambient temperature in advance, and reads and sets a delay time corresponding to an externally designated ambient temperature. .

With this configuration, the delay time data corresponding to each temperature data and each distance data is stored in advance, so that the setting of the delay time can follow the rapid temperature change.

Further, the sound image localization apparatus of the present invention has a configuration in which the delay time adjusting means sets the delay time based on temperature data from a temperature sensor for detecting the ambient temperature.

With this configuration, the delay time can be automatically set based on the temperature data from the temperature sensor.

Further, the sound image localization apparatus of the present invention has a distance measuring means for automatically measuring the distance from the sound receiving point to the main speaker and the auxiliary speaker.

With this configuration, even when the speaker is installed at a high place or a distance from the sound receiving point, the distance from the sound receiving point to the speaker can be automatically measured and input.

Further, the sound image localization apparatus of the present invention has display means for displaying the delay time set for each of the main speaker and the auxiliary speaker by the delay time adjusting means.

With this configuration, the delay time set for each speaker is displayed on the display means, so that the operator can easily confirm the delay time.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing a sound image localization apparatus according to an embodiment of the present invention. A sound source 1 for outputting a sound signal such as a musical sound signal or a voice signal and the volume of the sound signal are controlled for each speaker. The apparatus includes a volume control section 2, a delay time control section 3 for controlling a delay time of an audio signal for each speaker, and a power amplification section 4 for controlling an amplification degree of the audio signal for each speaker. In this example, a configuration for controlling the main speaker S1 and the auxiliary speaker S2 is shown.

Further, a distance L1 between the main speaker S1 and the sound receiving point SR and a distance L between the auxiliary speaker S2 and the sound receiving point SR are determined.
A distance data input unit 21 for inputting 2 as distance data;
Distance data storage unit 2 for storing input distance data
2. A volume setting unit 23 that outputs a volume control signal for controlling the volume of the main speaker S1 and the auxiliary speaker S2 in the volume control unit 2 from the stored distance data. The volume control unit 2, the distance data input unit 21, the distance data storage unit 22, and the volume setting unit 23 constitute a volume control unit.

Further, a temperature data input section 31 for inputting temperature data representing the ambient temperature of the place where the main speaker S1 and the auxiliary speaker S2 and the sound receiving point SR are installed, temperature data for storing the input temperature data A delay time for setting a delay time of the main speaker S1 and the auxiliary speaker S2 in the delay time control unit 3 based on the distance data stored in the distance data storage unit 22 and the temperature data stored in the temperature data storage unit 32. A delay time setting unit 33 that outputs a setting signal is provided. The delay time control unit 3, the temperature data input unit 31, the temperature data storage unit 32, and the delay time setting unit 33 constitute a delay time adjusting unit.

The distance data stored in the distance data storage unit 22, the temperature data stored in the temperature data storage unit 32, and the delay time set for each speaker by the delay time setting unit 33 are stored in the display control unit 34. Is displayed on a display unit 35 composed of an LCD (Liquid Crystal Display) or a CRT (Cathode Ray Tube) under the control of.

As the distance data input section 21, various types can be used, and a keyboard directly input by an operator or a distance measuring sensor for automatically measuring and inputting a distance from a sound receiving point to a speaker. and so on. In addition, various types of temperature data input units 31 can be used,
There are a keyboard directly input by an operator and a temperature sensor for automatically measuring and inputting an ambient temperature.

Next, the operation of the sound image localization apparatus according to the present embodiment will be described. As described above, the distance between the main speaker S1 and the sound receiving point SR is L1, and the auxiliary speaker S
It is assumed that the distance between the sound receiving point SR and the sound receiving point SR is L2, and that L1> L2.

First, distance data L1 and distance data L2 are input from distance data input section 21 to distance data storage section 22, and temperature data storage section 3 is input from temperature data input section 31.
2. Input the ambient temperature data.

The sound volume setting section 23 compensates for the distance attenuation of the audio signals output from the main speaker S1 and the auxiliary speaker S2. The distance attenuation is “log ｛1 / (4πR ² )}”
And R is the distance from the speaker to the sound receiving point. Therefore, the main speaker S1 is “R = L1” and the auxiliary speaker S
2 is “R = L2”.

The delay time setting unit 33 controls the delay time control unit 3 so that the audio signal output from the main speaker S1 and the audio signal output from the auxiliary speaker S2 reach the sound receiving point SR at the same time. That is, since L1> L2, the sound signal output from the auxiliary speaker S2 is output with a delay with respect to the sound signal output from the main speaker S1. The delay time is a time Td obtained by subtracting the "time T2 from the auxiliary speaker S2 to the sound receiving point SR" from the "time T1 from the main speaker S1 to the sound receiving point SR".

That is, since T1 = L1 / sonic speed T2 = L2 / sonic speed, Td = T1-T2 = (L1-L2) / sonic speed = (L1-L2) / (331.4 + 0.6t). t is the temperature.

For example, if the distance L1 is 100 m, the distance L2 is 10 m, and the temperature t is 30 ° C., the delay time is “Td =
258 msec ”. If the temperature t is 10 ° C.,
The delay time is “Td = 267 msec”.

As described above, since the sound speed changes depending on the ambient temperature, the delay time of the sound signal output from the auxiliary speaker is set so as to change depending on the ambient temperature.
Even when the ambient temperature changes, a sound image localized at a predetermined sound image position can be provided.

In the above-described embodiment, the temperature data storage unit 32 stores only the input temperature data. However, the sound speed data corresponding to each temperature data is stored in advance, and the delay time setting is performed. The sound speed data may be output to the unit 33. Alternatively, delay time data corresponding to each temperature data and each distance data may be stored in the delay time setting unit 33 in advance.

[0030]

As described above, according to the present invention, the delay time of the sound signal output from the auxiliary speaker with respect to the sound signal output from the main speaker can be set according to the ambient temperature. It is possible to provide an excellent sound image localization device that can continue to provide a sound image localized at a predetermined sound receiving point even when the sound image changes.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a sound image localization apparatus according to an embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 sound source 2 volume control unit 3 delay time control unit 4 power amplification unit 21 distance data input unit 22 distance data storage unit 23 volume setting unit 31 temperature data input unit 32 temperature data storage unit 33 delay time setting unit 34 display control unit 35 display Part S1 Main speaker S2 Auxiliary speaker SR Sound receiving point

Claims (5)

[Claims] 1. A main speaker and an auxiliary speaker; a volume controller for setting the volume of an audio signal output from a sound source for each of the main speaker and the auxiliary speaker; and a delay time of the audio signal output from the volume controller. Delay time adjusting means for setting the main speaker and the auxiliary speaker, and the delay time adjusting means sets a delay time of the auxiliary speaker with respect to the main speaker according to an ambient temperature and a distance to a predetermined sound receiving point. A sound image localization device characterized by setting. 2. The delay time adjusting means according to claim 1, wherein the delay time is stored in advance for each ambient temperature, and a delay time corresponding to an externally designated ambient temperature is read and set. Sound image localization device. 3. The sound image localization apparatus according to claim 1, wherein the delay time adjusting unit sets the delay time based on temperature data from a temperature sensor that detects the ambient temperature. 4. The sound image localization apparatus according to claim 1, further comprising a distance measuring means for automatically measuring a distance from the sound receiving point to the main speaker and the auxiliary speaker. 5. The sound image localization apparatus according to claim 1, further comprising display means for displaying the delay time set for each of the main speaker and the auxiliary speaker by the delay time adjustment means.