JPS55154422A - Reverberation characteristic measuring apparatus - Google Patents
Reverberation characteristic measuring apparatusInfo
- 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
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
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)
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 |
-
1979
- 1979-05-19 JP JP6210379A patent/JPS55154422A/en active Pending
Cited By (3)
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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