Patent ID: 7007182
Filing Date: 2006-02-28
Classification: H04L,H04N,Y02D

Abstract:
1. A communication terminal apparatus connected to an analog communication network, the apparatus comprising: a line interface circuit configured to connect to the analog communication network and to control the network, convert analog data comprising network control and monitor signals and a modulated signal received from the network into digital data, and convert digital data comprising network control and monitor signals and a modulated signal for transmitting to the network into analog data; a digital signal processing circuit configured to comprise a network control signal processing section that receives network control and monitor signals from the line interface circuit and a modulation and demodulation processing section that receives a modulated digital signal from the line interface circuit and transmits a modulated digital signal to the line interface circuit; a digital interface device disposed functionally between the line interface circuit and the digital signal processing circuit and configured to electrically isolate the network control and monitor signals and the modulated digital signals; and a power-saving control device configured to carry out the operation of the line interface circuit and the network control signal processing section of the digital signal processing circuit and suspend the operation of the modulation and demodulation processing section of the digital signal processing circuit so as to be into a power-saving state when a predetermined power-saving state change factor has occurred in a normal operating state, and resume the suspended operation of the modulation and demodulation processing section of the digital signal processing circuit when an incoming call signal is received by the line interface circuit and processed by the network control signal processing section of the digital signal processing circuit during the power-saving state, wherein in the power-saving state the network control signal processing section of the digital signal processing circuit remains in operation and powered.