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Standard

IEEE 661-1979

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Abstract

New IEEE Standard - Inactive-Reserved. To describe a practical and reproducible method of determining the loudness ratings of telephone connections. Loudness ratings may be measured directly using appropriate test instruments and facilities, as specified in this standard, or may be computed using the amplitude-frequency characteristic of the connection measured in accordance with IEEE Std 269-1971. .

Products specifications

  • Standard from IEEE
  • Published:
  • Withdrawn:
  • Document type: IS
  • Pages
  • Publisher: IEEE
  • Distributor: IEEE
  • ICS: 17.140.01
  • ICS: 33.040.01
  • National Committee: IEEE Communications Society / Standards Development Board

Product Relations

  • Referred by: IEEE 820-2021
  • Referred by: IEEE 269-2010
  • Referred by: IEEE 820-2005
  • Referred by: IEEE 820-1984
  • Refers: CCITT (International Telegraph and Telephone Consultative Committee) Recommendation P 72, Measurement of Reference Equivalents and Relative Equivalents, CCITT Green Book, vol 5, International Telecommunication Union, 1973, 2 Rue de Varembe, 1211 Geneva 20, Switzerland.
  • Refers: ANSI S3.2-1960 (R1971), American National Standard Method for Measurement of Monosyllabic Word Intelligibility.
  • Refers: ANSI S3.5-1969 (R1973), American National Standard Methods for the Calculation of the Articulation Index.