Abstract
The PCM 'sound-in-syncs' system described in an earlier report (Βι¶ΉΤΌΕΔ RD 1969/35) incorporates a frequency-dependent syllabic compandor, in which an out-of-band pilot tone is used to control the expander gain. The present report describes the essential features of this compandor, gives performance data obtained with experimental equipment and suggests some possible future improvements.
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