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Method for measuring frequency characteristic and rising edge of impulse response, and sound field correcting apparatus

A technology of frequency characteristics and impulse response, applied in measuring devices, measuring ultrasonic/sonic/infrasonic waves, stereo systems, etc., can solve problems such as prolonging measurement time, and achieve the effect of reducing resources and shortening time

Inactive Publication Date: 2007-05-09
SONY CORP
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Problems solved by technology

This disadvantageously increases the measurement time and the resources required in the measurement such as CPU, DSP and memory

Method used

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  • Method for measuring frequency characteristic and rising edge of impulse response, and sound field correcting apparatus
  • Method for measuring frequency characteristic and rising edge of impulse response, and sound field correcting apparatus
  • Method for measuring frequency characteristic and rising edge of impulse response, and sound field correcting apparatus

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Embodiment Construction

[0048] [1] Concept of the present invention

[0049] In the known measurement technique as described in the above document or other documents, after verifying that the length N of the TSP as the output and the length v of the impulse response in the reproduced sound field can satisfy the above formula (5), the impulse Stimulus response measured TSP.

[0050] However, for a normal sound field, it is sufficient to correct the frequency response characteristics and time alignment (time delay correction), so only the corrected parameters need to be obtained.

[0051] Therefore, the present embodiment is not aimed at "accurate calculation of impulse response", but "accurate derivation of parameters for sound field correction". Therefore, a TSP shorter than the reverberation time expressed by the following equation will be used.

[0052] N≤v (6)

[0053] Specifically, TSP sounds corresponding to such TSPs are continuously output to the reproduction sound field, so that parameters...

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Abstract

A method for measuring a frequency characteristic of a system for measurement, in which the length of an impulse response of the system is greater than the length N of a TSP (time stretched pulse) signal, is provided. The method includes the steps of supplying the TSP signal to the system continuously for a predetermined number of times, adding and averaging output signals each having the length N, and performing circular convolution on a value obtained by the adding and averaging so that the frequency characteristic of the system is obtained.

Description

[0001] References to related applications [0002] The present invention contains subject matter related to Japanese Patent Application JP2005-315738 filed in the Japan Patent Office on Oct. 31, 2005, the entire content of which is hereby incorporated by reference. technical field [0003] The invention relates to a method for measuring the frequency characteristic and rising edge of an impulse response, and a sound field correction device. Background technique [0004] As DVD (Digital Versatile Disc) and digital broadcasting become more and more popular, multi-channel audio systems are becoming more and more popular in ordinary homes. This increases the need for the listener (user) to perform various setting and adjustment operations of the audio channel by himself. [0005] However, setup and adjustment operations in multi-channel audio systems are often complex and difficult for users who are not skilled in operating such systems. Thus, various attempts have been made t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H17/00H04S7/00
CPCH04S7/305H04R3/00
Inventor 浅田宏平
Owner SONY CORP
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