Article View: comp.ivideodisc
Article #497Re: DVI exerpt
From: John Robinson
Date: Thu, 12 Jan 1989 22:18
Date: Thu, 12 Jan 1989 22:18
26 lines
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1564 bytes
In article <4470@tekgvs.GVS.TEK.COM>, regisc@tekgvs (Regis Crinon) writes: >In article <7070001@hpindda.HP.COM> rbean@hpindda.HP.COM (Rich Bean) writes: >>> *ADPCM -probably Analog to Digital, Pulse Code Modulation >>> -C. Fogg >> >>I think ADPCM might be: >> Adaptive Delta Pulse Code Modulation >> > > ADPCM stands for Adaptive Differential Pulse Code Modulation. > "Pulse Code Modulation" refers to the fact that the input > signal has been sampled and quantized into N (generally 8 ) > bits per samples. ADPCM is an international (CCITT) standard for use in telephony. The usual digitized voice, using PCM, requires 64,000 bits/sec of bandwidth. ADPCM halves this to 32,000, doubling the capacity of networks and phone switches. I am not sure that this can apply to DVI as-is, though the general approach might well. The compression can be even better through the use of a variable encoding rate rather than constant as telephone networks require. -- /jr jr@bbn.com or bbn!jr
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arc1-ca.pugleaf.net!utzoo!attcan!uunet!lll-winken!ames!mailrus!tut.cis.ohio-state.edu!bloom-beacon!mit-eddie!bbn!jr@bbn.comReferences:
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Path: arc1-ca.pugleaf.net!utzoo!attcan!uunet!lll-winken!ames!mailrus!tut.cis.ohio-state.edu!bloom-beacon!mit-eddie!bbn!jr@bbn.com From: jr@bbn.com (John Robinson) Newsgroups: comp.ivideodisc Subject: Re: DVI exerpt Message-ID: <34474@bbn.COM> Date: 12 Jan 89 22:18:56 GMT References: <494@blake.acs.washington.edu> <7070001@hpindda.HP.COM> <4470@tekgvs.GVS.TEK.COM> Sender: news@bbn.COM Reply-To: jr@bbn.com (John Robinson) Organization: BBN Systems and Technologies Corporation, Cambridge MA Lines: 26 In-reply-to: regisc@tekgvs.GVS.TEK.COM (Regis Crinon)