Abstract: The device for detecting telephone line seizure performs a measurement of voltage of the telephone line across a first and a second optocoupler connected in series to the telephone line and arranged head-to-tail. The first optocoupler makes it possible to discharge a capacitor connected to the telephone line, the second optocoupler converts the discharge current into an image current in a measurement circuit. This device comprises means ensuring negative feedback of the second optocoupler to the first optocoupler. With this layout, the influence of the transfer coefficients of the optocouplers on the voltage measurement is decreased, so as to increase the accuracy of measurement.

Abstract: The device for detecting telephone line seizure performs a measurement of voltage (UL) of the telephone line across a first and a second optocoupler (OC1, OC2) connected in series to the telephone line and arranged head-to-tail. The first optocoupler (OC1) makes it possible to discharge a capacitor (C) connected to the telephone line, the second optocoupler (OC2) converts the discharge current (ID) into an image current (ID′) in a measurement circuit (S). This device comprises means ensuring negative feedback of the second optocoupler (OC2) to the first optocoupler (OC1). With this layout, the influence of the transfer coefficients of the optocouplers on the voltage measurement is decreased, so as to increase the accuracy of measurement.

Abstract: The disclosure concerns a procedure for insertion of samples representing digital data from a first source having a first bit rate in a digitized signal from a second source having a second bit rate, wherein the second bit rate is greater than the first bit rate, and each data of the first source is associated with at least one sample of a series of samples at the second bit rate, the samples being presented to a polyphase filter for which a set of coefficients is associated with a specific phase error previously introduced by said associations, the filtered samples being included in the digitized signal. The invention also includes a device that implements the above insertion procedure. The invention is applicable notably in the field of insertion of Teletext data into a digitized video signal.