PDC Enhanced Full Rate is a speech coding standard that was developed by ARIB in Japan and used in PDC mobile networks in Japan. The carriers use one of those codecs as PDC-EFR: CS-ACELP 8 kbit/s (a.k.a. NTT DoCoMo Hypertalk) and ACELP 6.7 kbit/s (a.k.a. J-PHONE Crystal Voice).
- ARIB RCR STD-27L, Personal Digital Cellular Telecommunication System RCR Standard "5.3 CS-ACELP speech CODEC" and "5.4 ACELP Speech CODEC"
- IEICE Knowledge-Base Category 2. Part 8. Chapter 3. The encoding methods for mobiles IEICE
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