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INTERNATIONAL TELECOMMUNICATION UNIONCCITTG.726THE INTERNATIONALTELEGRAPH AND TELEPHONECONSULTATIVE COMMITTEEGENERAL ASPECTS OF DIGITALTRANSMISSION SYSTEMS;TERMINAL EQUIPMENTS40, 32, 24, 16 kbit/s ADAPTIVEDIFFERENTIAL PULSE CODEMODULATION (ADPCM)Recommendation G.726Geneva, 1990FOREWORDThe CCITT (the International Telegraph and Telephone Consultative Committee) is a permanent organ of theInternational Telecommunication Union (ITU). CCITT is responsible for studying technical, operating and tariffquestions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwidebasis.The Plenary Assembly of CCITT which meets every four years, establishes the topics for study and approvesRecommendations prepared by its Study Groups. The approval of Recommendations by the members of CCITT betweenPlenary Assemblies is covered by the procedure laid down in CCITT Resolution No. 2 (Melbourne, 1988).Recommendation G.726 was prepared by Study Group XV and was approved under the Resolution No. 2procedure on the 14 of December 1990.___________________CCITT NOTEIn this Recommendation, the expression "Administration" is used for conciseness to indicate both atelecommunication Administration and a recognized private operating agency.� ITU 1990All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic ormechanical, including photocopying and microfilm, without permission in writing from the ITU.Recommendation G.7261Recommendation G.726Recommendation G.72640, 32, 24, 16 kbit/s ADAPTIVE DIFFERENTIAL PULSECODE MODULATION (ADPCM)1)1GeneralThe characteristics below are recommended for the conversion of a 64 kbit/s A-law or µ-law pulse codemodulation (PCM) channel to and from a 40, 32...