Patent ID: 6243461
Filing Date: 2001-06-05
Classification: H04M

Abstract:
A caller-identification (caller-ID) receiving apparatus used in a telephone, coupled to a telephone wire to automatically detect a signal of a channel seizure and process a message-waiting, comprising:a wake-up circuit, wherein the wake-up circuit is coupled to the telephone wire and can be activated when a ring appears on the telephone wire;a timer, wherein the timer is able to periodically send a signal to activate the wake-up circuit;a frequency shift keying (FSK) detector and demodulator, wherein the FSK detector and demodulator is coupled to the telephone wire and can be activated by the wake-up circuit to detect an FSK signal on the telephone wire and demodulate the FSK signal and, therefore, export a demodulated signal; anda data-recovery circuit, wherein the data-recovery circuit can receive the demodulated signal, wherein when the wake-up circuit has been activated by the timer to wake up the FSK detector and the data-recovery circuit, but the signal of the channel seizure has not been detected yet after a certain time, then the data-recovery circuit sends a sleeping signal to the wake-up circuit to put the FSK detector and demodulator in a sleeping state.