NDLI: An investigation of delta modulation of speech for mobile radio

Content Provider	IEEE Xplore Digital Library
Author	Karim, M.R.
Copyright Year	1967
Abstract	A characteristic of a mobile radio channel is the occurrence of correlated signal fading that results in burst errors. The use of adaptive delta modulation (ADM) based on explicit transmission of the quantizer step size was proposed earlier for speech communication over such a channel. Two other variable step-size delta modulation (VSDM) schemes are presented, and their performance in a mobile radio environment is discussed. One of them is the constant factor delta modulation that uses one-bit memory and produces fast and instantaneous step-size changes. The other is the digitally controlled delta modulation (DCDM) that incorporates a new step-size adaptation strategy using seven bits of memory. In some cases, bit scrambling has been used. This is equivalent to scrambling (spreading out in time) the, clustered errors. Computer simulations providing values of coder parameters for satisfactory signal-to-noise ratios for band-limited speech signals and Gaussian noise are described. New hardware realizations are given that allow those parameters to vary smoothly for a wide range of sampling frequencies. Results of informal listening tests obtained with a mobile radio channel simulator are included. It is shown that for mobile radio, DCDM, as expected, is the better of the two coders. This is because it does not sacrifice its overload performance for the sake of error resistance.
Sponsorship	IEEE Vehicular Technology Society
Starting Page	158
Ending Page	165
Page Count	8
File Size	654538
File Format	PDF
ISSN	00189545
Volume Number	31
Issue Number	4
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1982-11-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Delta modulation Speech Land mobile radio Fading Oral communication Digital control Communication system control Computer errors Computer simulation Signal to noise ratio
Content Type	Text
Resource Type	Article
Subject	Applied Mathematics Automotive Engineering Computer Networks and Communications Electrical and Electronic Engineering Aerospace Engineering

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

A subband coding, BCH coding, and 16-QAM system for mobile radio speech communications

Postdetection selection diversity effects on digital FM land mobile radio

Partial response continuous phase modulation and DPCM coding for speech transmission in cellular mobile radio systems

BPSK system with sounder to combat Rayleigh fading in mobile radio communication

A formula for an FM signal under Rayleigh fading (mobile radio)

Digitized speech transmission at VHF using existing FM mobile radios

Rayleigh fading compensation for QAM in land mobile radio communications

Combined speech and channel coding for mobile radio communications

A packet-based CAPDM speech coder for PCN applications

An investigation of delta modulation of speech for mobile radio

Similar Documents

A subband coding, BCH coding, and 16-QAM system for mobile radio speech communications

Postdetection selection diversity effects on digital FM land mobile radio

Partial response continuous phase modulation and DPCM coding for speech transmission in cellular mobile radio systems

BPSK system with sounder to combat Rayleigh fading in mobile radio communication

A formula for an FM signal under Rayleigh fading (mobile radio)

Digitized speech transmission at VHF using existing FM mobile radios

Rayleigh fading compensation for QAM in land mobile radio communications

Combined speech and channel coding for mobile radio communications

A packet-based CAPDM speech coder for PCN applications

An investigation of delta modulation of speech for mobile radio