ES182502A1 - METHOD OR MEANS FOR THE TRANSMISSION OF LOW FREQUENCY CALLS IN TELECOMMUNICATION SYSTEMS - Google Patents
METHOD OR MEANS FOR THE TRANSMISSION OF LOW FREQUENCY CALLS IN TELECOMMUNICATION SYSTEMSInfo
- Publication number
- ES182502A1 ES182502A1 ES0182502A ES182502A ES182502A1 ES 182502 A1 ES182502 A1 ES 182502A1 ES 0182502 A ES0182502 A ES 0182502A ES 182502 A ES182502 A ES 182502A ES 182502 A1 ES182502 A1 ES 182502A1
- Authority
- ES
- Spain
- Prior art keywords
- transmission
- telecommunication systems
- frequency
- low frequency
- modulation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Landscapes
- Transmitters (AREA)
- Transceivers (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
En un método y medios para la transmisión de llamadas de baja frecuencia en sistemas de telecomunicación un método de transmisión de llamadas de baja frecuencia que comprende un sistema transmisor en el cual se disponen medios para producir la modificación de una corriente portadora por modulación a una frecuencia relativamente baja y medios para introducir en la modulación importantes armónicos de la citada frecuencia de llamada que aseguren una gran profundidad de modulación de la mencionada corriente portadora, y un sistema receptor en el que se disponen medios para seleccionar uno o más de los citados armónicos producidos en el referido sistema transmisor y medios para que la corriente de dichos armónicos seleccionados actúe los dispositivos de llamada.In a method and means for the transmission of low-frequency calls in telecommunication systems, a method of transmission of low-frequency calls comprising a transmitter system in which means are arranged to produce the modification of a carrier current by modulation to a frequency relatively low and means to introduce into the modulation important harmonics of said calling frequency that ensure a great depth of modulation of said carrier current, and a receiver system in which means are provided to select one or more of said harmonics produced in said transmitter system and means for the current of said selected harmonics to actuate the call devices.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES0182502A ES182502A1 (en) | 1944-12-26 | 1948-02-20 | METHOD OR MEANS FOR THE TRANSMISSION OF LOW FREQUENCY CALLS IN TELECOMMUNICATION SYSTEMS |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES49590744 | 1944-12-26 | ||
ES0182502A ES182502A1 (en) | 1944-12-26 | 1948-02-20 | METHOD OR MEANS FOR THE TRANSMISSION OF LOW FREQUENCY CALLS IN TELECOMMUNICATION SYSTEMS |
Publications (1)
Publication Number | Publication Date |
---|---|
ES182502A1 true ES182502A1 (en) | 1948-05-16 |
Family
ID=38468373
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ES0182502A Expired ES182502A1 (en) | 1944-12-26 | 1948-02-20 | METHOD OR MEANS FOR THE TRANSMISSION OF LOW FREQUENCY CALLS IN TELECOMMUNICATION SYSTEMS |
Country Status (1)
Country | Link |
---|---|
ES (1) | ES182502A1 (en) |
-
1948
- 1948-02-20 ES ES0182502A patent/ES182502A1/en not_active Expired
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