JPH0685599B2 - Sound field correction device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound field correction device that measures characteristics of a reproduced sound field and automatically corrects the sound field.

2. Description of the Related Art In recent years, a sound field correction device has been developed which measures acoustic characteristics in a room and a vehicle compartment and changes the characteristics of an equalizer according to the measured value to automatically correct the characteristics of a reproduced sound field.

Conventionally, a sound field correction device has a configuration in which an acoustic characteristic measuring unit and an equalizer unit are integrated.

FIG. 2 shows the configuration of the above-described conventional sound field correction apparatus. In FIG. 2, 1 is a signal generator for measurement, 2 is an equalizer for sound field correction, 3 is an amplifier, 4 is a speaker,
Reference numeral 5 is a microphone for measuring acoustic characteristics, 6 is an amplifier for amplifying a signal from the microphone 5, 7 is a band-pass filter for dividing each band, 8 is an acoustic measurement circuit for measuring the magnitude of the signal from the microphone 5, 9 Is a correction characteristic calculation unit that calculates the correction value of the equalizer 2 based on the measured value, and 10 is a control circuit that sets the characteristics of the equalizer.

The operation of the sound field correction device configured as described above will be described below.

The measurement signal from the measurement signal generator 1 passes through the equalizer 2 having flat characteristics, is amplified by the amplifier 3, and is reproduced from the speaker 4. Next, the measurement signal is received by the microphone 5 placed in the listening position in the room and amplified by the amplifier 3 to an appropriate level. Next, the bandpass filter 7
Is separated into each band, and the sound pressure level of each band is measured by the acoustic measurement circuit 8. Based on the value measured by the acoustic measurement circuit 8, the correction characteristic calculation unit 9 performs calculation so that the listening point characteristic becomes flat or a preset characteristic, and determines the correction characteristic of the equalizer 2. The determined correction value of the equalizer 2 is transferred to the equalizer 2 by the control circuit 10, and a correction characteristic is set in the equalizer 2.

By the above operation, it becomes possible to listen at the listening position with the flatness characteristic or the preset characteristic.

Problems to be Solved by the Invention However, in the configuration in which the acoustic characteristic measuring instrument and the equalizer are integrated as described above, the acoustic characteristic measuring instrument is an unnecessary function in a place such as a hall or a gymnasium where the speaker position is not moved. However, there was an inconvenience that the material cost was high.

In view of the above-mentioned drawbacks, the present invention provides a sound-measuring function and a sound-field correcting function as separate devices, and a correction characteristic of the equalizer determined by measuring the sound characteristic is read-only
It is not necessary to repeatedly measure the acoustic characteristics by writing to a storage medium such as M) or a floppy disk and reading the value of the correction characteristic from the storage medium with the sound field corrector. The cost can be reduced by eliminating the.

Means for Solving the Problems In order to solve the above problems, the sound field correction device of the present invention is
Measurement signal generator for measuring the sound field in the room, microphone, acoustic characteristic measuring circuit for measuring acoustic characteristics, and equalizer correction so that the listening point characteristics are flat or preset based on the measured acoustic characteristics. An acoustic characteristic measuring instrument comprising a correction characteristic calculation means for calculating a characteristic and a recording means for recording the value calculated by the correction characteristic calculation means in a storage medium, and the correction characteristic of the equalizer recorded by the recording means. The sound field corrector includes a reading unit that reads from the storage medium, a control unit that sets the read correction characteristic in the equalizer, and a sound field corrector that includes the equalizer.

Effect The present invention has the above-described configuration to measure the acoustic characteristics of the room, write the correction characteristics of the equalizer in the storage medium, and set the correction characteristics of the equalizer of the sound field corrector through the storage medium. Need not be integrated, and it is possible to determine the correction characteristics of a plurality of sound field correctors with one acoustic characteristic measuring instrument, and it is also possible to write various information in the storage medium.

Embodiment Hereinafter, a sound field correction device according to an embodiment of the present invention will be described with reference to the drawings. The same components as those of the conventional example shown in FIG. 2 are designated by the same reference numerals.

FIG. 1 shows the configuration of a sound field correction apparatus according to an embodiment of the present invention. In FIG. 1, 14 is a measurement signal generator that generates a signal for acoustic characteristic measurement, a microphone 5 that measures a sound field in a room, an amplifier 6, a bandpass filter 7 that divides each band, and a bandpass. An acoustic measurement circuit 8 that measures the magnitude of each band signal from the filter 7, a correction characteristic calculation unit 9 that calculates the correction value of the equalizer 2 based on the measurement value, and a record that records the correction value in the storage medium 11. Part 10a
The acoustic specific measuring device 15 configured by means of the reading unit 12 for reading the correction characteristic of the equalizer 2 from the equalizer 2 and the storage medium 11, and the correction characteristic of the reading unit 12 for the equalizer 2
The sound field corrector is composed of the control circuit 13 set to.

With respect to the sound field correction device configured as described above, first
The operation will be described with reference to the drawings.

First, the signal generated from the measurement signal generator 1 for measuring the acoustic characteristic in the room passes through the equalizer 2 and the amplifier 3 which are set in advance and is reproduced by the speaker 4.
The microphone 5 collects any sound in the room, and the amplifier 6
After amplifying to an appropriate level with a bandpass filter 7
Is divided into a plurality of bands by. The acoustic measurement circuit 8 measures the sound pressure frequency characteristic, the reverberation time frequency characteristic, etc., and transfers the values to the correction characteristic calculation unit 9. The correction characteristic calculation unit 9 calculates the correction characteristic of the equalizer 2 based on the measured value so that the listening point characteristic is flat or becomes a preset characteristic. The correction constant calculated in this way is recorded
It is written in the storage medium 11 at 10a. In this embodiment, a ROM (Read Only Memory) is used as the storage medium 11. Therefore, the recording unit 10a in this case is composed of a ROM writer or the like.

With the above, the acoustic characteristic measurement and the correction characteristic calculation of the equalizer 2 are completed, and the role of the acoustic characteristic measuring device 14 is completed.

Next, the storage medium 11 is attached to the sound field corrector 15 (note that the attachment structure is not shown). In the sound field corrector 15, a storage medium
The correction constant of the equalizer 2 is read from 11 using the reading unit 12. The control circuit 13 sets the above-mentioned correction constant in the equalizer 2. If the flatness characteristic, the speech characteristic, the music reproducing characteristic, and the like as the correction characteristics of the equalizer 2 are recorded in the storage medium 11 in advance, a single storage medium 11 reproduces various kinds of acoustic characteristics suitable for the reproduction purpose. It is possible to

As described above, according to the present embodiment, the correction characteristic of the equalizer is calculated based on the room acoustic characteristic measured by the acoustic characteristic measuring device, the information of the room acoustic characteristic to be written in the storage medium and reproduced in the storage medium is recorded. As a result, it is possible to reproduce the signal with the desired acoustic characteristics only with the storage medium and the sound field compensator, and with one sound measuring instrument, the sound field compensator installed at another location can be reproduced. It can also be used to determine characteristics.

In the present embodiment, the correction characteristics are obtained for the case of reproduction with one speaker, but information of various acoustic characteristics such as the correction characteristics for reproduction with a plurality of speakers may be written in the storage medium.

Further, as the storage medium 11, a floppy disk may be used instead of the ROM.

As described above, according to the present invention, the acoustic characteristic of the room is measured by the acoustic characteristic measuring device, the correction characteristic of the equalizer is written in the storage medium, and the characteristic of the equalizer of the sound field corrector is set using the storage medium. With this configuration, the acoustic characteristic measuring function and the sound field correcting function can be separated, and the extra function can be omitted, so that the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a block diagram of a sound field correction device according to an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional sound field correction device. 1 ... Measurement signal generator, 2 ... equalizer, 5 ... microphone, 7 ... bandpass filter, 8 ... acoustic measurement circuit, 9 ... correction characteristic calculation unit, 10a ... recording unit, 11 ...
Storage medium, 12 …… reading section, 13 …… control circuit, 14 ……
Acoustic characteristic measuring instrument, 15 …… Sound field corrector.

 ─────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-60-165899 (JP, A) JP-A-60-254899 (JP, A) JP-A-61-84200 (JP, A)

Claims (1)

[Claims] 1. A measurement signal generator for generating a signal for measuring an acoustic characteristic in a room, a microphone for collecting a sound reproduced through a speaker based on the signal, and a sound based on an output of the microphone. An acoustic measuring circuit for measuring characteristics, a correction characteristic calculating means for calculating the correction characteristics of the equalizer so that the listening point characteristics are flat or preset based on the measured values, and the correction characteristics are recorded in a storage medium. An acoustic characteristic measuring device configured by a recording unit, the equalizer for correcting the acoustic characteristic, a reading unit for reading the correction characteristic from the storage medium, and a control unit for setting the equalizer characteristic according to the correction characteristic. Sound field correction device comprising a sound field correction device.