Infineon Technologies Ag

Thomas Hauser

Christian Kranz

Burkhard Becker

Martin Krueger

Thuyen Le

Johann Steger

Matthias Obermeier

Frank Hürtgen

Norbert Metz

A system and apparatus for establishing whether a received signal frame is an audio signal frame is disclosed. In one embodiment, the system includes a predetermined position in an audio signal frame containing a piece of secondary information for an audio characteristic of the audio data, with a selection device for selecting a succession of bits which is arranged at the predetermined position in the received signal frame. A decision-making device flags the received signal frame as an audio signal frame if the succession of bits represents the piece of secondary information.

Apparatus and method for identifying signal frames as audio signal frames

The apparatus contains a counter that is synchronized to the reference time in the mobile station. The counter counts sampled chips of the radio signal to produce a count. The apparatus further includes a controller that controls the processing of the radio signal, activates the processing of the radio signal when the count matches a begin count, and deactivates the processing of the radio signal when the count matches an end count, wherein the begin count and the end count are determined by a signal processor as a function of the time frame offset of the radio signal with respect to the reference time in the mobile station.

Apparatus and method for time control of the processing of a radio signal in a mobile station

A detection circuit and method for detecting AC voltage pulses at a defined frequency relate to first transforming an input signal to a low-frequency signal by multiplying the input signal by a mixing frequency. This down-mixed signal can then be filtered and evaluated. The circuit is particularly suitable for identifying charge unit signals in the telephone network.

Circuit and method for detecting AC voltage pulses

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Munich, Germany

Thomas Hauser