HOWLING MARGIN MEASURING DEVICE

Title:

HOWLING MARGIN MEASURING DEVICE

Document Type and Number:

WIPO Patent Application WO/2005/011327

Kind Code:

A1

Abstract:

A howling margin measuring device (20), comprising a treatment means (28) having a gain regulating means (21) and a compressor (22) connected in series to each other and a control means (23). The gain regulating means (21) gives a gain to an inputted voice signal and outputs that signal, and the compressor (22) compresses the voice signal at a specified ratio when the level of the inputted voice signal is equal to or higher than a threshold level and outputs that signal. The control means (23) can control the gain of the gain regulating means (21), and can read the compression level of the compressor (22). The control means (23) reads the compression level of the compressor (22) while gradually increasing the gain of the gain regulating means (21) and, based on whether the read compression level is above a specified value or not, determines whether howling occurs or not. Then, based on the gain of the gain regulating means (21) obtained when the control means (23) determines that howling occurs, the control means (23) calculates howling margin.

Inventors:

HIGASHIHARA DAISUKE (JP)

Application Number:

PCT/JP2004/009297

Publication Date:

February 03, 2005

Filing Date:

June 24, 2004

Export Citation:

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Assignee:

TOA CORP (JP)
HIGASHIHARA DAISUKE (JP)

International Classes:

H04R3/02; H04R29/00; H04R27/00; (IPC1-7): H04R3/02

Foreign References:

JPH09247787A	1997-09-19
JPH04225699A	1992-08-14
JPS62198298A	1987-09-01
JP2002543681A	2002-12-17
JPH06350486A	1994-12-22

Other References: