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Nokia Spain SA
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Alcatel Espana SA
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Application filed by Alcatel Espana SAfiledCriticalAlcatel Espana SA
Publication of ES285674A3publicationCriticalpatent/ES285674A3/en
A method of receiving vocal frequency key signals constituted by a frequency or by a combination of frequencies, characterized in that several voice frequency receivers (E1 ... En) are provided that have a bandwidth (B1 ... Bn) which extends over several margins (S1 ... S5, or S1 ... S3 respectively) of signal frequency, because the bandwidths of the different speech frequency receivers (E1, E2 ...) include several signal frequency margins (S1 ... S5, S2 ... S6, etc.) and because upon receipt of a key signal, the respective output information is formed through the contacts of the receiver relays . (Machine-translation by Google Translate, not legally binding)
ES0285674A1961-05-051963-03-02Method of receiving vocal frequency key signals (Machine-translation by Google Translate, not legally binding)
ExpiredES285674A3
(en)
A procedure to reduce the disturbances after the detection of two modulated signals in tone frequency (Machine-translation by Google Translate, not legally binding)