Novel Applications of Speech Processing in AT&amp;T Network Systems Products

Verma, Mahendra K.; Prezas, D.; Russell, Tom; Sherif, Mostafa Hashem; Thorkildsen, Reed

doi:10.1002/j.1538-7305.1990.tb00123.x

Cited by 3 publications

(1 citation statement)

References 11 publications

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“…G.727 can be used withG.764 for wideband packet network applications, such as in AT&T's integrated access andcross-connect system (IACS). 30 Lower transmission rates such as 24and 16kb/s, if based on ADPCM, do not provide networkquality coding. However, they permitoccasional bursts ofheavy telephone traffic to be accommodated, without explicit coordination amongallnodes in the path ofthe call.…”

Section: Network-quality Speech Codingmentioning

confidence: 99%

Coding of Speech and Wideband Audio

Jayant

Lawrence

Prezas

1990

At&T Technical Journal

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Advances in coding algorithms and digital signal processing have led to sophisticated technologies for speech communication for a variety of applications, as well as to greater flexibilities in the design of ISDN terminals for integrated communication of speech, images, and data. For traditional telephony with a signal band‐width of 3.2 kHz, the transmission rate for network‐quality speech is now down to 16 kb/s. Robust communications‐quality speech appropriate for cellular radio has been realized at 8 kb/s. Research attention is shifting toward 4 kb/s, focused on improving speaker identification and the naturalness of coded speech. For wideband audio with a signal bandwidth of 7 kHz, high‐quality coding is now possible at 32 kb/s, which implies stereo teleconferencing or dual‐language programming over a 64‐kb/s channel. Transparent coding of 20‐kHz audio has been demonstrated at 128 kb/s, with near‐transparent performance at rates as low as 64 kb/s for some classes of signals.

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Section: Network-quality Speech Codingmentioning

confidence: 99%

Coding of Speech and Wideband Audio

Jayant

Lawrence

Prezas

1990

At&T Technical Journal

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An automatic telephone operator using speech recognition

Zhou

Zeng

Feng-Chongxi

Proceedings of International Conference on Communication Technology. ICCT '96

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Personal communications network

Verma

TENCON '91. Region 10 International Conference on EC3-Energy, Computer, Communication and Control Systems

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Wireless access and egress gives the service prcividers an added flexibility for personal communications which deals with linking people rather than their telephones. Currently, persona! communication needs are partially satisfied by several wireless s,ervices including cellular mobiles, pagers, satellite and cordless telephones. Based on emerging concepts, architectures and standards, enhancements to existing wireless services and several new services are now under ccxideration; the new services include digital cellular systems, and wireless PBX and CENTREX services. Globally, each of these services can be based on different standards and have unique characteristics. This may prevent the: ubiquitous offering of a 'truPy' globai wireless services, Personal communications network (PCN) is seen as a vehicle to offer global services. This paper discusses the PCW concept, architecture and evolution.

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Novel Applications of Speech Processing in AT&T Network Systems Products

Cited by 3 publications

References 11 publications

Coding of Speech and Wideband Audio

Coding of Speech and Wideband Audio

An automatic telephone operator using speech recognition

Personal communications network

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