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AssigneeNTT Mobile Communications Network, Inc.
InventorsYoshinobu Nakamura, Yutaka Ohto, Takashi Ueda, Tomoyuki Ohya
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A speech freeze-out method in a communication system for transmitting speech information, which is sent from public telephone terminals (1) to a control center (5) through voice channels, from the control center (5) to a base station (8) through time division multiplexing radio frequency channels (6), and from the base station (8) to mobile stations (17) through transponders (13). The freeze-out processing is carried out when the control center (5) feeds the speech information to the time division multiplexing radio frequency channels (6) so that the number of transmission channels from the base station (8) to the transponders (13) is limited within an upper limit value. The control center (5) sequentially detects the presence and absence of a speech spurt in each frame of respective voice channels during each time slot of the time division multiplexing radio frequency channels, counts the number of the channels including the speech spurt, and performs the speech freeze-out processing when the count value exceeds the upper limit value. The number of transmission channels from the base station (8) to the transponders (13) is positively limited within the upper limit value.
Speech freeze-out control equipment in a mobile satellite communication system having a plurality of telephone terminals, a control center connected with the telephone terminals through voice channels, a radio base station connected with the control center through time division multiplexing radio frequency channels, and a plurality of mobile stations connected with the base station through transponders, said control center performing, by assigning speech information from the telephone terminals to time slots of the time division multiplexing radio frequency channels, freeze-out of the speech information when sending the speech information to the base station so that the number of channels connected to the transponders is limited within a predetermined upper limit value, said speech freeze-out control equipment comprising:
A speech freeze-out control method in a mobile satellite communication system having a plurality of telephone terminals, a control center connected with the telephone terminals through voice channels, a radio base station connected with the control center through time division multiplexing radio frequency channels, and a plurality of mobile stations connected with the base station through transponders, said control center performing, by assigning speech information from the telephone terminals to time slots of the time division multiplexing radio frequency channels, freeze-out of the speech information when sending the speech information to the base station so that the number of channels connected to the transponders is limited within a predetermined upper limit value, said speech freeze-out control method comprising:
A communication system which detects the presence and absence of a speech spurt in speech information in each frame successively sent through a receiving channel, and transmits only frames including the speech spurt through a transmission channel in assigned times for transmission, said assigned times lagging behind reception of the frames by a predetermined delay time, said communication system comprising:
A communications method which detects the presence and absence of a speech spurt in speech information in each frame successively sent through a receiving channel, and transmits only frames including the speech spurt through a transmission channel in assigned times for transmission, said assigned times lagging behind reception of the frames by a predetermined delay time, said communications method comprising:
Dependencies are inferred from the claim text.