Presented is a portable tool developed for the purpose of field measurement of accurate reverberation time and transmission frequency characteristics of a given enclosure. This tool, involving a CRT and a tone burst generator, is termed AS-1 and displays computation results such as ensemble-averaged reverberation curves associated with calculated RT60, D50, and EDT10) through the minimized operation. The adoption of microprocessor and its peripherals as well as ideas to reduce the data size has allowed the online and real-time measurement of these parameters ordinarily obtained on a large off-line computer. This paper mainly describes the functions and system architecture of this tool, introducing the data obtained in the actual measurements and the digital signal processing technologies employed. Associated with its spatial averaging and synchronized averaging capability, AS-1 is also applicable to the absorption coefficient measurements and examination of audio equipment, requiring only a pair of speakers and a microphone, and no other apparatus such as sweep generator and level recorder or no complicated measurement techniques.
Authors:
Kawakami, Fukushi; Niimi, Koji; Yamaguchi, Kiminori
Affiliation:
Nippon Gakki Company, Ltd., Hamamatsu, Japan
AES Convention:
66 (May 1980)
Paper Number:
1632
Publication Date:
May 1, 1980
Click to purchase paper as a non-member or you can login as an AES member to see more options.
No AES members have commented on this paper yet.
To be notified of new comments on this paper you can subscribe to this RSS feed. Forum users should login to see additional options.
If you are not yet an AES member and have something important to say about this paper then we urge you to join the AES today and make your voice heard. You can join online today by clicking here.