HP R4.2 - Manual (Page 502)

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Summary of Commands encode
UCS 1000 R4.2 Administration 585-313-507 Issue 3 April 2000 463
encode
The encode command converts ADPCM16 or ADPCM32 files to PCM64
files.
Synopsis
encode [adpcm32/adpcm16]
Description
Encode is a filter that converts PCM64 files to ADPCM16 or ADPCM32 files.
ADPCM16 is easy to code and saves space, but does not provide good
quality sound.
Warning
The voice header used by GSE should be stripped (using stripdhr) before
running encode.
Appropriate code headers must be added (using addhdr) before the
converted file can be played on the voice system.