IEEE standard method for determining objective loudness ratings of telephone connections
By: [prepared by the Subcommittee on Telephone Instrument Testing of the Transmission Systems Committee of the IEEE Communications Society].
Series: IEEE Std --  661-1979.
Publisher: Institute of Electrical and Electronics Engineers
Published: 1979
Place of publication: New York
Language: eng
Number of pages: 20
Subjects: Telephone relays -- Standards
Notes: "IEEE std 661-1979."

Also available via the World Wide Web with additional title: ANSI/IEEE Std 661-1979.