JPS55154422A - Reverberation characteristic measuring apparatus - Google Patents

Reverberation characteristic measuring apparatus

Info

Publication number
JPS55154422A
JPS55154422A JP6210379A JP6210379A JPS55154422A JP S55154422 A JPS55154422 A JP S55154422A JP 6210379 A JP6210379 A JP 6210379A JP 6210379 A JP6210379 A JP 6210379A JP S55154422 A JPS55154422 A JP S55154422A
Authority
JP
Japan
Prior art keywords
integrated value
time
noise
operational amplifier
input
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP6210379A
Other languages
Japanese (ja)
Inventor
Fukuji Kawakami
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Gakki Co Ltd
Original Assignee
Nippon Gakki Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Gakki Co Ltd filed Critical Nippon Gakki Co Ltd
Priority to JP6210379A priority Critical patent/JPS55154422A/en
Publication of JPS55154422A publication Critical patent/JPS55154422A/en
Pending legal-status Critical Current

Links

Landscapes

  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)

Abstract

PURPOSE: To enable the accurate and simple measurement of reverberation time by detecting the time when irregular fluctuations begin thereby setting the evaluation section of the reverberation time (curve).
CONSTITUTION: The integrated value I1 in the specified section of the difference between the square R2(x) of sum of impulse response r(x) and noise n(x) and the square neff 2 of the noise n(x) is input to an input terminal 1, and is input as integrated value I2 to the inversion input end of an operational amplifier 3 which constitutes a substractor. On the other hand, the integrated value I1 is delayed by as much as the specified time by a delay circuit 4 and is supplied as integrated value I3 to the noninversion input end of the operational amplifier 3. When the substractoin of I3-I2 is accomplished in the operational amplifier 3 and the integrated value I4 is sent out to an output terminal 5, the time when the fluctuations of the noise n(x) begin inrregular fluctuations may be detected by detecting the time when the polarity of the integrated value I4 shifts from positive to negative.
COPYRIGHT: (C)1980,JPO&Japio
JP6210379A 1979-05-19 1979-05-19 Reverberation characteristic measuring apparatus Pending JPS55154422A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6210379A JPS55154422A (en) 1979-05-19 1979-05-19 Reverberation characteristic measuring apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6210379A JPS55154422A (en) 1979-05-19 1979-05-19 Reverberation characteristic measuring apparatus

Publications (1)

Publication Number Publication Date
JPS55154422A true JPS55154422A (en) 1980-12-02

Family

ID=13190371

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6210379A Pending JPS55154422A (en) 1979-05-19 1979-05-19 Reverberation characteristic measuring apparatus

Country Status (1)

Country Link
JP (1) JPS55154422A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60205224A (en) * 1984-03-30 1985-10-16 Shimizu Constr Co Ltd Reverberation measuring apparatus
JP2013130857A (en) * 2011-11-22 2013-07-04 Yamaha Corp Sound processing device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60205224A (en) * 1984-03-30 1985-10-16 Shimizu Constr Co Ltd Reverberation measuring apparatus
JPH0568646B2 (en) * 1984-03-30 1993-09-29 Shimizu Construction Co Ltd
JP2013130857A (en) * 2011-11-22 2013-07-04 Yamaha Corp Sound processing device

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