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Top Document: ZyXEL modem FAQ List v4.2, Nov 20 1995, Part 3 of 5 [Technical FAQs] Previous Document: T.20A How does the voice quality compare versus the Rockwell chipset? Next Document: T.21 Can a voice call be detected by the modem? See reader questions & answers on this topic! - Help others by sharing your knowledge -------------------------------------------------------------------------------- 4-bit ADPCM was introduced in 07-05-1994, with v6.13 of the ZyXEL ROMs. The increased number of bits improves the voice quality noticeably. Brent Mosbrook (brentm@zyxel.com) [ZyXEL USA] adds: "Currently, the sample rate is 9600 samples/second. 3-bit ADPCM requires the DTE speed to be 38.4K." The new 4-bit ADPCM requires a 57,600 DTE speed. Question Q.10 mentions that there will be a faster DTE rate in the next generation of modems. This raises the possibility that even higher encoding rates may arise in the future. User Contributions:Top Document: ZyXEL modem FAQ List v4.2, Nov 20 1995, Part 3 of 5 [Technical FAQs] Previous Document: T.20A How does the voice quality compare versus the Rockwell chipset? Next Document: T.21 Can a voice call be detected by the modem? Part1 - Part2 - Part3 - Part4 - Part5 - Single Page [ Usenet FAQs | Web FAQs | Documents | RFC Index ] Send corrections/additions to the FAQ Maintainer: rwong@direct.ca (Robert Wong Jr.)
Last Update March 27 2014 @ 02:11 PM
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ZyXEL modem FAQ List v4.2, Nov 20 1995, Part 3 of 5 [Technical FAQs]
Section - T.20B When will better quality speech at higher encoding rates be available?
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ZyXEL modem FAQ List v4.2, Nov 20 1995, Part 3 of 5 [Technical FAQs]
Section - T.20B When will better quality speech at higher encoding rates be available?
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