JPH0555690U - Sound reproduction signal processor for speaker - Google Patents

Abstract

(57) [Abstract] [Purpose] To obtain a speaker reproduction characteristic of an arbitrary characteristic, to obtain a small-sized speaker acoustic reproduction signal processing device, and to obtain a system in which the characteristic can be easily changed. [Structure] The characteristics of the speaker used for reproduction are constant amplitude,
A filter coefficient for performing constant group delay correction and a coefficient of a filter having a desired reproduction characteristic are convoluted, and the calculated coefficient is written in an IC card. The IC card is used to write coefficient data to a speaker sound reproduction signal processing device. To supply.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a sound reproduction signal processing device for a speaker.

[0002]

[Prior Art]

 FIG. 3 is a block diagram showing a conventional sound reproduction signal processing device for a speaker. In the figure, 1 is a sound reproduction signal processing device for a speaker, 14 is a digitizer that sets an arbitrary filter characteristic, 15 is a disk unit that stores the correction filter coefficient of the speaker unit, and 16 is an input from the digitizer 14. The personal computer 17 performs a convolution operation of the coefficient of the filter and the coefficient of the correction filter of the speaker unit obtained from the disk unit 15, and 17 is used to pass the coefficient obtained by the personal computer 16 to the digital filter 18. The data converter 18 is a digital filter system for filtering audio data.

Next, the operation will be described. Digital audio data is input to the conventional speaker sound reproduction signal processing apparatus shown here. The coefficient data supplied to the digital filter 18 for filtering this digital audio data is supplied as follows. The correction coefficient filter coefficient of the speaker unit read from the disk unit 15 and the filter coefficient of an arbitrary characteristic input by the digitizer 14, for example, the speaker unit that is corrected by the correction characteristic stored in the disk unit 15. And a coefficient of a filter having a characteristic of a speaker unit which is completely different from the above, are subjected to a convolution operation by the personal computer 16 to obtain a new filter coefficient. The new filter coefficient thus obtained is supplied to the digital filter system 18 via the data converter 17.

By performing the filtering process as described above, the speaker sound reproduction signal processing device can reproduce a speaker system having arbitrary characteristics with a kind of speaker system. That is, the reproduction characteristics of the B speaker can be obtained by using the A speaker.

[0005]

[Problems to be solved by the device]

 In the conventional system as described above, a digitizer, a disk unit, a personal computer, and a data converter are all required to obtain the filter coefficient for filtering, which causes a problem that the system becomes large.

The present invention has been made to solve the above problems, and provides a small-sized speaker sound reproduction signal processing device capable of easily exchanging filter coefficient data for filtering processing. The purpose is to provide.

[0007]

[Means for Solving the Problems]

 The present invention is a coefficient obtained by performing a convolution operation on a coefficient of a filter having a characteristic of a filter that corrects a speaker unit characteristic with a constant amplitude and a constant group delay and a coefficient of a filter having an arbitrary characteristic. The IC card type external storage means in which the data is recorded supplies the filter coefficient to the sound reproduction signal processing device for the speaker.

[0008]

[Action]

 By using the IC card type external storage device having the above contents, the speaker sound reproduction signal processing device can be downsized, and the filtering process characteristics can be easily changed.

[0009]

【Example】

 Example 1. FIG. 1 is a block diagram showing a sound reproduction signal processing apparatus for a speaker according to an embodiment of the present invention. In the figure, 7 is an IC card that stores the coefficient obtained as a result of performing the convolution operation of the coefficient of the correction characteristic filter of the speaker unit and the coefficient of the filter of an arbitrary characteristic, 6 is the data of the IC card, The IC card reader supplies the digital filter 18 as a coefficient.

Next, the operation will be described. The contents of the IC card 7 are read by the IC card reader 6 and supplied to the digital filter 18. Here, in the IC card 7, a coefficient of a filter having a characteristic of correcting a speaker unit used by connecting to a speaker sound reproducing device to have a constant amplitude characteristic and a constant group delay, and a coefficient of a filter having a desired reproducing characteristic. The coefficients resulting from the convolution calculation of and are written in, and filtering is performed based on the data of this IC card 7.

Second Embodiment FIG. 2 shows a memory map of the IC card 7 in the second embodiment. This is an example of a coefficient array for a four-unit speaker system and corresponding to three sampling frequencies.

In FIG. 2, 8a to 8d are coefficient data with a sampling frequency of 48 KHz, 9a to 9d are coefficient data with a sampling frequency of 44.1 KHz, and 10a to 10d are coefficient data with a sampling frequency of 32 KHz. The subscript a is a memory area that stores the filter coefficient that corrects the unit characteristic for the speaker unit 1 to the constant amplitude group delay and the filter coefficient that is the result of the convolution operation of the filter coefficient with the desired characteristic. b is a coefficient storage area for the speaker unit 2, subscript c is a coefficient storage area for the speaker unit 3, and subscript d is a coefficient storage area for the speaker unit 4.

The operation is similar to that of the first embodiment, the content of the IC card 7 is read according to the sampling frequency of the digital audio signal used for reproduction, and the coefficient is supplied to the digital filter system 18.

[0014]

[Effect of the device]

 Since the present invention is configured as described above, not only can the system of the sound reproduction signal processing device for the speaker be downsized, but the characteristics can be easily changed by replacing the card. Play.

[Brief description of drawings]

FIG. 1 is a block diagram showing a sound reproduction signal processing apparatus for a speaker according to an embodiment of the present invention.

FIG. 2 is an address map according to a second embodiment of the present invention.

FIG. 3 is a configuration diagram showing a conventional audio reproduction signal processing device for a speaker.

[Explanation of symbols]

1 Sound reproduction signal processing device for speaker 6 IC card reader 7 IC card 8a to 8d Coefficient data 9a to 9d for which convolution calculation of sampling frequency 48KHz is performed Coefficient data 10a to 10d for convolution calculation of sampling frequency 44.1KHz Coefficient data obtained by performing convolution operation of frequency 32 kHz 18 Digital filter system

Claims (1)

[Scope of utility model registration request] 1. A signal processing device for performing digital filtering processing on digitized audio data, the coefficient of a filter having a characteristic of a filter for correcting a speaker unit characteristic to a constant amplitude and a constant group delay, and an arbitrary value. IC card type external storage means in which coefficient data obtained by performing a convolution operation on the coefficient of the filter having the characteristic of (1) is recorded, and information is read from the IC card type external storage means and the digital filter system receives the filter coefficient. And an IC card type external storage device reading means for supplying the sound reproduction signal processing device for a speaker.