Abstract: The present invention is directed to an apparatus and method that provides a universal call processing system to process all possible data types transmitted over an ISDN telephone line. A universal call processing system generally comprises an ISDN interface subsystem, a call control subsystem, a call processing subsystem, a controller state machine, and user interface devices.

Abstract: A method and apparatus for improved mobile radio telecommunications employs the transmission of a pilot reference signal within the coherence band of the modulated carrier wave. The receiver in this system uses instantaneous phase estimation techniques of the pilot and carrier received waveforms to provide immunity from phase distortion introduced by the channel.

Abstract: A tone blocking system and method for use preferably in conferencing systems in order to prevent control tones from being transmitted to other conferees is disclosed. The buffer length used to process the signal and detect tones is varied, being increased when a tone is suspected to allow for sophisticated tone detection algorithms, and being decreased when silence is present by trimming the silence away. The technique minimizes delay, and its degrading effect on echo, but nonetheless provides for a lengthy buffer required to do reliable tone detection. The invention is applicable to any signal other than tone as well.

Abstract: The present invention relates to a system and method for sending and receiving digital signals in a voice communication system. The system includes a data buffer, a tone detector, a speech encoder, and a transmitting unit. The data buffer receives and stores a digitized signal including voice band tone data and speech data. The tone detector detects the voice band tone data and generates at least one tone packet containing data indicative of the voice band tone data. The speech encoder encodes the speech data into a plurality of compressed speech packets. The transmitting unit in communication with the tone detector and the speech encoder transmits a packet message including tone packets and speech packets over an RF channel. The present invention also relates to a receiver including a speech decoder and a tone generator. The speech decoder decompresses speech packets to generate a digitized speech signal.

Abstract: A circuit and method for detecting identification signals in a digital input signal (Rx) having signal parameter values which are provided to a signal memory (54). The values provided to the signal memory (54) are updated at a sampling frequency. The circuit includes a set of processing units (50) which are arranged so as to be freely programmable by a user. The signal memory (54) stores values of input signal (Rx) and output signals of the processing units. A programmation memory (56) stores at predetermined locations associated with the inputs of the processing units, the signal memory addresses associated with the signals that the user desires to connect to these inputs. A controller (64) sequentially reads the addresses stored in the programmation memory (56) and provides the values stored in the signal memory (54) corresponding to the read addresses to inputs of respective processing units in an order corresponding to the predetermined locations.