Process for interception-protected frequency band compressed transmission of speech signals

US4550222A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Manfred Hanni · Munich, DE
• Josef Brusch · Unterhaching, DE

Key dates

• Filing date: Jul 23, 1982
• Grant date: Oct 29, 1985
• Expiry date: Jul 23, 2002

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04K1/06
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

In order to achieve a good masking, together with minimum bandwidth requirement of sample values of spectral channels which are to be transmitted in the timing of consecutive analysis intervals in a time division multiplex sum signal, and of other predetermined speech parameters which likewise represent sample values, including at least one item of synchronizing information, at the transmitting end, the time-wise overlap of the sample values and of the synchronizing information are effected pseudo-randomly within consecutive frames of the sum signal and the analog sum signal obtained in this manner is transmitted across a shaping network to the receiving end, either directly in its base frequeny, or in a desired higher frequency position, or else indirectly by modulation onto a carrier.