Communication Terminal Device, Communication Method, and Communication System
AssigneeMurata Kikai Kabushiki Kaisha
InventorOsamu KIMOTO
Life of this patent
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Abstract
A facsimile machine, which is an analog communication terminal connected to a facsimile machine of another end via an IP network, monitors a silence generating interval by detecting energy of a signal received from the facsimile machine of the other end. When a silent state generates periodically, the facsimile machine judges that the communication is abnormal caused by a packet loss. When the communication is judged to be abnormal, the communication is interrupted or the communication speed is decelerated.
Claims20
A communication terminal device comprising:
- means for monitoring a silence generating interval by detecting energy of a voice receiving signal received via an Internet protocol network;
- means for determining whether or not the silence generating interval monitored by the means for monitoring is periodic;
- and
- means for judging that a communication is abnormal when the means for determining determines that the silence generating interval is periodic.
A communication method comprising the steps of:
- receiving a voice receiving signal from a communication terminal device of another end via an Internet protocol network;
- monitoring a silence generating interval by detecting energy of the received voice receiving signal;
- determining whether or not the monitored silence generating interval is periodic;
- and
- judging that a communication is abnormal when the silence generating interval is determined to be periodic.
A communication system comprising:
- an analog transmitter communication terminal device;
- a transmitter gateway device connected to the transmitter communication terminal device via an analog communication line;
- a recipient gateway device connected to the transmitter communication terminal device via an Internet protocol network;
- and
- a recipient communication terminal device connected to the recipient gateway device via the analog communication line,
- wherein the recipient communication terminal device includes:
- means for monitoring a silence generating interval by detecting energy of a voice receiving signal received via the analog communication line;
- means for determining whether or not the silence generating interval monitored by the means for monitoring is periodic;
- and
- means for judging that a communication is abnormal when the means for determining determines that the silence generating interval is periodic.
A communication terminal device comprising:
- a monitor unit that monitors a silence generating interval by detecting energy of a voice receiving signal received via an Internet protocol network;
- a determining unit that determines whether or not the silence generating interval monitored by the monitor unit is periodic;
- and
- a judging unit that judges that a communication is abnormal when the determining unit determines that the silence generating interval is periodic.
Dependencies are inferred from the claim text.