Referenced by|
| US3946162 | May 17, 1974 | Mar 23, 1976 | International Standard Electric Corporation | System for transferring wideband sound signals | | US3952164 | Jul 18, 1974 | Apr 20, 1976 | Telecommunications Radioelectriques et Telephoniques T.R.T.
Etat Francais | Vocoder system using delta modulation | | US3988546 | Sep 13, 1974 | Oct 26, 1976 | General Signal Corporation | System for audibly recognizing an aurally unclassifiable signal | | US4181822 | Mar 7, 1978 | Jan 1, 1980 | Bell & Howell Company | Bandsplitter systems | | US4229622 | Mar 14, 1978 | Oct 21, 1980 | The Post Office | Multiplexing speech signals |
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