AES New York 2013
Product Design Session PD3

Saturday, October 19, 9:00 am — 11:00 am (Room 1E09)


PD3 - Telephony: An Introduction to the Acoustics of Personal Telecommunications Devices

Christopher Struck, CJS Labs - San Francisco, CA, USA

The basic concepts of telephonometry and electroacoustics of telephones and personal telecommunications devices are introduced. Techniques for assessing analogue, digital, cellular, VoIP, USB, and other telephone devices are presented. Objective evaluation of the performance of handsets, headsets, speakerphones, and hands-free devices is discussed and interfacing to these devices is explained. Selection, calibration, and use of microphones, ear simulators, mouth simulators, and test fixtures are described. The send, receive, sidetone, and echo transmission paths are defined. The use of real speech test signals and pulsed noise for distortion is illustrated using examples from IEEE 269. The concept of Loudness Rating, its history, and standardized methods for its calculation are reviewed. Methods specified in ITU-T, IEEE, TIA, ETSI, and the 3GPP standards are explained.

AES Technical Council This session is presented in association with the AES Technical Committee on Audio for Telecommunications

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