NDLI: Vocoded speech through fading channels

Content Provider	IEEE Xplore Digital Library
Author	Gold, B. Lynch, J. Tierney, J.
Copyright Year	1983
Description	Author affiliation: M.I.T., Lincoln Laboratory, Lexington, MA (Gold, B.)
Abstract	HF speech communications is possible beyond the line of sight because signals in the 5-30 MHz range are refracted by the ionosphere. The fading these signals suffer and the channel impulse burst noise can be mitigated by a variety of channel equalizer and error correcting coding schemes. If the fade or burst noise is severe enough or long enough, however, speech communication becomes difficult or impossible. This paper describes how vocoders can be designed to overcome these difficulties in a way that is more or less transparent to the users, i.e., the users can talk through fades and not have to repeat themselves. Two methods are discussed; first, variable rate vocoding techniques and second, "speeded-up" speech. The speeded-up speech works as follows. During a deep fade, the transmitter retains the necessary speech parameter information. When the channel returns, this information is transmitted and transformed into speech at the receiver wherein the speaker is perceived to be speaking more rapidly, although with the correct pitch and spectrum. This allows the listener to "catch-up" with the speaker. A demonstration will be given to show how the vocoder performs under several simulated fading situations.
Starting Page	101
Ending Page	103
File Size	55805
Page Count	3
File Format	PDF
DOI	10.1109/ICASSP.1983.1172252
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1983-04-14
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Speech Fading Vocoders Modems Automatic repeat request Signal processing algorithms Oral communication Ionosphere Error correction Gold
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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