Enhanced circuit-switched calls

摘要

A terminal for transmitting a voice signal, comprising: a transmitter having a first transmission module arranged to transmit signals over a packet-switched data network and a second transmission module arranged to transmit signals over a circuit-switched telephony network; a microphone for generating a voice signal; and signal processing apparatus configured to generate a first signal and a second signal from the voice signal, each representing information from the voice signal over a same portion of time. The signal processing apparatus is further configured to supply the first signal to the first transmission module for transmission to a receiver via the packet-switched data network, and to supply the second signal to the second transmission module for transmission to the receiver via the circuit-switched telephony network. There is also provided a terminal for receiving such signals and reconstructing the voice signal, and corresponding methods and program products.

主权项

1. A terminal for transmitting a voice signal, comprising:
a transmitter having a first transmission module arranged to transmit signals over a packet-switched data network and a second transmission module arranged to transmit signals over a circuit-switched telephony network; a microphone for generating a voice signal for the call; and signal processing apparatus coupled to the transmitter and the microphone, configured to:
generate a first signal comprising a higher frequency band without a lower frequency band and a second signal comprising the lower frequency band without the higher frequency band from the voice signal for the call, each representing information from the voice signal over a same portion of time, generate a third signal from the voice signal and to supply the third signal to the first transmission module for transmission to a receiver via the packet-switched data network, the first signal comprising the higher frequency band without both of the lower frequency band and an extra low frequency band, the second signal comprising the lower frequency band without both of the higher frequency band and the extra low frequency band, and the third signal comprising the extra low frequency band without both of the higher frequency band and the lower frequency band, wherein the lower frequency band contains frequencies used by circuit network voice calls, the higher frequency band contains frequencies above the lower frequency band to a limit, and the extra low frequency band contains frequencies below the lower frequency band;supply the voice signal during the call to the receiver as both the first signal encoded by the first transmission module for transmission to said receiver via the packet-switched data network, and the second signal encoded by the second transmission module for transmission to said receiver via the circuit-switched telephony network; andprovide the voice signal to the transmitter to send to the receiver to enable the receiver to reconstruct the voice signal from a combination of the first signal and the second signal.