Speech detector for pcm-tasi system

Claim 2

A speech detector for a communication system transmitting and receiving pulse code modulation PCM signals in time slots on a time-division basis, said slots being connectable and disconnectable on a time assignment speech interpolation basis to and from trunks, comprising means for forming selected combinations of binary digits of the transmitted and of the received PCM signals comprising respectively first level digits characterizing the level of said transmitted PCM signals and second level digits characterizing the level of said received PCM signals; means for sequentially selecting a particular time slot of a recurrent sequence of time slots containing said first level digits; means deriving from said selected time slots first slot pulses whenever a signal level exceeding a predetermined threshold occurs and second slot pulses corresponding to the amount by which said signal level exceeds said threshold; means for determining the level of said threshold in dependence on the second level digits; means for counting with a given recurrence period the first slot pulses during a first predetermined period and the second slot pulses during a second predetermined period; and means for deriving from said counting means control signals for the connection and disconnection of said slots to and from said trunks.

Claim 3

A speech detector for a communication system transmitting and receiving pulse code modulation PCM signals in time-slots on a time-division basis, said slots being connectable and disconnectable on a time assignment speech interpolation basis to and from trunks, comprising means for forming selected combinations of binary digits of the transmitted and of the received PCM signals comprising respectively first level digits characterizing the level of the transmitted PCM signals and second level digits characterizing the level of said received PCM signals; means for sequentially detecting said selected first level digits during a particular time slot of a recurrent sequence of time slots and in a predetermined number of occurences of said particular time slot said threshold; means for determining the level of said threshold in dependence on the second level digits; means for counting with a given recurrence period the first slot pulses during a first predetermined period and the second slot pulses during a second predetermined period; and means for deriving from said counting means control signals for the connection and disconnection of said slots to and from said trunks.

Claim 4

A speech detector for a communication system transmitting and receiving pulse code modulation PCM signals in time-slots on a time-division basis, said slots being connectable and disconnectable on a time assignment speech interpolation basis to and from trunks, comprising means for forming selected combinations of binary digits of the transmitted and of the received PCM signals comprising respectively first level digits characterizing the level of the transmitted PCM signals and second level digits characterizing the level of said received PCM signals; means for sequentially detecting said selected first level digits during a particular time slot of a recurrent sequence of time slots and in a predetermined number of occurences of said particular time slot said threshold; means for determining the level of said threshold in dependence on the second level digits; means for counting with a given recurrence period the first slot pulses during a first predetermined period and the second slot pulses during a second predetermined period; and means for deriving from said counting means control signals for the connection and disconnection of said slots to and from said trunks.

Claim 5

A speech detector for a communication system transmitting and receiving pulse code modulation PCM signals in time slots on a time-division basis, said slots being connectable and disconnectable on a time assignment speech interpolation basis to and from trunks, comprising a time base generator defining time slots, on the one Hand for a unitary period for processing the comparison of a signal level in a trunk of the communication system with a predetermined threshold level, and on the other hand for a complete period or complete cycle for sequentially processing the comparison of signal levels in all the trunks of the communication system with said threshold; means for forming selected combination of binary digits of the transmitted and of the received PCM signals comprising respectively first level digits characterizing the level of said transmitted signals and second level digits characterizing the level of said received signals; means for selecting first level digits in dependence on the reception amplitude level; a plurality of flipflops respectively associated with the time slots; means for sequentially storing said selected first level digits in given one of said flipflops, during a predetermined number of associated recurrent time slots and at the rate of the unitary cycles, a second flipflop; means for succesively transfering at the rate of the unitary cycles the digits stored in the first flipflops into the second flipflop; processing means for deriving from the digits stored in said second flipflop first slot pulses whenever a signal level exceeding said predetermined threshold occurs and second slot pulses corresponding to the amount by which said signal level exceeds said threshold; means for counting at the rate of the complete cycle the said fist slot pulses during a first predetermined period and the said second slot pulses during a second predetermined period; and means for deriving from said counting means control signals for the connection and disconnection of said slots to and from said trunks.

Claim 6

A speech detector for a communication system transmitting and receiving pulse code modulation PCM signals in time slots on a time-division basis, said slots being connectable and disconnectable on a time assignment speech interpolation basis to and from trunks, comprising a time base generator defining time slots, on the one Hand for a unitary period for processing the comparison of a signal level in a trunk of the communication system with a predetermined threshold level, and on the other hand for a complete period or complete cycle for sequentially processing the comparison of signal levels in all the trunks of the communication system with said threshold; means for forming selected combination of binary digits of the transmitted and of the received PCM signals comprising respectively first level digits characterizing the level of said transmitted signals and second level digits characterizing the level of said received signals; means for selecting first level digits in dependence on the reception amplitude level; a plurality of flipflops respectively associated with the time slots; means for sequentially storing said selected first level digits in given one of said flipflops, during a predetermined number of associated recurrent time slots and at the rate of the unitary cycles, a second flipflop; means for succesively transfering at the rate of the unitary cycles the digits stored in the first flipflops into the second flipflop; processing means for deriving from the digits stored in said second flipflop first slot pulses whenever a signal level exceeding said predetermined threshold occurs and second slot pulses corresponding to the amount by which said signal level exceeds said threshold; means for counting at the rate of the complete cycle the said fist slot pulses during a first predetermined period and the said second slot pulses during a second predetermined period; and means for deriving from said counting means control signals for the connection and disconnection of said slots to and from said trunks.