Scrambling system for an audio frequency signal
US4683586A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 29, 1983 |
| Grant date | Jul 28, 1987 |
| Priority date | — |
| Expiry date | Dec 29, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04K1/06
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A scrambling system for an audio frequency signal is disclosed which employs a timebase-compressing and/or expanding system to measure the compressed and/or expanded amount of a segment time length caused in a transmission recording and reproducing system. In the scrambling system of the present invention, a marker signal is inserted into a portion between the adjoining segments and transmitted from an encoder side to a decoder side, while at the decoder side, this marker signal is detected, the synchronization is achieved by this marker signal along the compression and expansion of the segment length and the respective segments are rearranged to the original correct order. Thus, the connected portion between the segments can be made smooth so that it is possible to obtain the scrambling system for an audio frequency signal having high accuracy and high reliability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.