NDLI: A 3.4/7 kHz Audio Bandwidth Selectable Digital Phone Interface (DPI) Chip with on chip analog functions and modem

Content Provider	IEEE Xplore Digital Library
Author	Haspeslagh, D. Moerman, E. Chang, Z. Haspeslagh, J.
Copyright Year	1993
Description	Author affiliation: ALCATEL BELL, VLSI R&D DEPARTMENT, Francis Wellesplein, 1, 2018 Antwerp, Belgium (Haspeslagh, D.; Moerman, E.; Chang, Z.; Haspeslagh, J.)
Abstract	The Digital Phone Interface (DPI) is designed for a new generation of digital telephone terminals for private exchanges. This circuit gives a total solution for all telephone function thereby including DSP functions, voice coding/decoding and analog front end, signal generators for DTMF and ringing, modem for data transfer between terminal and exchange and a multitude of interfaces to communicate to the external world. Besides the normal earpiece micro and speaker, handsfree operation is available by using a selectable input low noise microphone amplifier and an additional 50 ¿ 100mW LS driver. For the handsfree operation an AGC and anti-oscillation (anti-larsen) function is implemented. The line modem generates a modified RTZ (WAL2) code and is able to cover distances to 1.5 km. In addition the component is extensible with external signal processing modules (echo cancelling ..) and is also able to transfer a 7 kHz speech bandwidth. The device is a mixed analog/digital design produced in a 1.2¿m CMOS technology on 46 $mm^{2}$ die area and consumes 200 mW.
Starting Page	162
Ending Page	165
File Size	1085368
Page Count	4
File Format	PDF
ISBN	286335134X
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1993-09-22
Publisher Place	Spain
Access Restriction	Subscribed
Rights Holder	Editions Frontieres
Subject Keyword	Bandwidth Modems Telephony CMOS technology Circuits Digital signal processing chips Decoding Signal generators Microphones Low-noise amplifiers
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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