System and method for detecting speech transmissions in the presence of control signaling
AssigneeEricsson Inc.
InventorsPhillip Marc Johnson, David Gregory, Yongbing Wan
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Abstract
A telecommunications system and method for improving the detection of speech and control signals within a telecommunications transmission, particularly, reducing the probability that the control signals and other non-speech transmission segments are interpreted as speech and played. Also, the system and method of the present invention is directed to techniques for reducing the probability that random noise during discontinuous transmission periods are interpreted as speech and played.
Claims40
A receiver apparatus in a digital telecommunication system, said receiver receiving a substantially continuous series of transmission frames containing therein speech transmission and respective frames within said series containing a plurality of control signal transmissions therein, said receiver apparatus comprising:
- a detector for detecting said series of transmission frames, said detector setting a multiplicity of flags therein for a particular transmission frame, said flags comprising a speech flag set if said particular transmission frame contains speech therein, a control signal detected flag set if said particular transmission frame contains said control signal transmissions therein and a control signal likely flag if said particular transmission frame potentially contains said control signal transmissions therein;
- and
- a summation device, attached to said detector, said detector applying said multiplicity of flags to said summation device, whereby said speech transmissions play at said receiver whenever said summation device indicates a speech transmission.
In a digital telecommunications system having a first communication system and a second communication system, the first and second communication systems coupled together by way of a communication channel, a combination with the first and second communication systems of communication circuitry for transmitting and receiving, respectively, a plurality of speech frames therebetween, said circuitry comprising:
- transmission means within said first communication system, said transmission means generating and transmitting a substantially continuous series of transmission frames containing said speech frame segments therein across said communication channel, said transmission means also generating and transmitting a plurality of transmission frames of a control signal across said communication channel, said control signal having precedence over said speech and a plurality of control signal frames overriding a corresponding plurality of said speech frames;
- reception means within said second communication system, said reception means for receiving said substantially continuous sequence of transmission frames containing therein said speech frames and said control frames across said communication channel;
- and
- detection means within said second communication system, said detection means for detecting said speech and said control signals within a segment of said continuous series of received transmission frames, said detection means identifying speech within a particular transmission frame of said segment by applying a multiplicity of flags to a summation device, said flags comprising a speech flag set if said detection means identifies said particular transmission frame as containing speech, a control signal detected flag set if said detection means identifies said particular transmission frame as containing control signals, and a control signal likely flag set if said detection means identifies said particular transmission frame as potentially containing control signals.
A digital telecommunications system having a transmitter and a receiver coupled together by way of a communication channel, a substantially continuous series of transmission frames containing speech and a plurality of control signals therein passing across said channel from said transmitter to said receiver across such channel, said control signal having precedence over and overriding said speech, said telecommunications system comprising:
- a detector, attached to said receiver, for detecting said series of transmission frames, said detector setting a multiplicity of flags, said flags comprising a speech flag set if a particular transmission frame contains speech therein, a control signal detected flag if said particular transmission frame contains said control signals therein and a control signal likely flag if said particular transmission frame potentially contains said control signals therein;
- and
- a summation device, attached to said detector, said detector applying said multiplicity of flags to said summation device, whereby speech transmissions play at said receiver whenever said summation device indicates a speech transmission.
A method for forwarding a transmission from a first communication system to a second communication system and playing said transmission at said second communication system, said method comprising the following steps:
- transmitting, from a transmitter within said first communication system to a receiver within said second communication system, a substantially continuous series of transmission frames across a communication channel therebetween, said series of transmission frames containing therein speech transmission frames and respective frames within said series containing a plurality of control signal transmissions;
- setting, within said receiver, a multiplicity of flags, said flags comprising a speech flag set if a particular transmission frame contains speech, a control signal detected flag set if said particular transmission frame contains said control signal transmissions, and a control signal likely flag set if said receiver determines that said particular transmission frame potentially contains said control signal transmissions;
- and
- applying said multiplicity of flags to a summation device within said receiver, whereby said speech transmission plays at said second communication system whenever said summation device indicates a speech transmission.
Dependencies are inferred from the claim text.