Patent ID: 7221703

Claim:
A system for synchronizing voice signal received via a public switched telephone network (PSTN) and data signal received via a digital subscriber line (DSL), the system comprising: a PSTN interface coupled to transmit and receive the voice signal; a data DSL transceiver coupled to modulate and demodulate the data signal; a synchronization circuit coupled to synchronize said voice signal and said data signal; and a converter circuit coupled to convert the synchronized voice signal and the synchronized data signal between analog and digital formats, wherein said synchronization circuit synchronizes said voice signal with said data signal, and comprises: a phase offset detection circuit coupled to detect a phase difference between a PSTN clock associated with said voice signal and a DSL clock associated with said data signal; a phase interpolation circuit coupled to adjust said voice signal according to the detected phase difference; and a multiplexer circuit coupled to multiplex said data signal with the adjusted voice signal for transmission.