ES2026119A6 - Portable system for the protection of spoken information transmitted via the telephone channel using frequency inversion techniques
- Google Patents
Portable system for the protection of spoken information transmitted via the telephone channel using frequency inversion techniques
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ENA TELECOMUNICACIONES SA
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ENA TELECOMUNICACIONES SA
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Priority to ES9100840ApriorityCriticalpatent/ES2026119A6/en
Publication of ES2026119A6publicationCriticalpatent/ES2026119A6/en
Portable system for the protection of spoken information transmitted via the telephone channel using frequency inversion techniques which consists of a compact assembly of electronic devices which carry out conversions on the electrical signal which conveys the spoken information and which are inserted between the connector of the telephone terminal and the rosette for connection to the telephone line, preventing the spoken information transmitted via said line from being listened to, similar equipment being installed at the other end of the line and carrying out the reverse conversions, obtaining the original signal.
ES9100840A1991-03-261991-03-26Portable system for the protection of spoken information transmitted via the telephone channel using frequency inversion techniques
Expired - LifetimeES2026119A6
(en)
Protection system for spoken data transmitted by telephonic channel by means of combining techniques of frequency inversion and pseudo-random time permutation of voice segments
Mobile telephone adapter system for use with audio device with one loudspeaker - has body with housing shaped like audio recording medium, magnetic recording head inside housing at location for contact with magnetic playback head of broad casting device, has one end of head coupled to signal transmission cable end