Digital wireless voice and data modem
First Claim
1. A method of substantially simultaneous transmission of voice content and data over a single voice channel of a digital wireless telecommunications system, a voice channel call being established between first and second stations, and the method comprising the steps of:
- partitioning the voice channel so as to comprise at least two logical bands, including a voice band and a control band, all within the audio range of frequencies;
transmitting voice content from the first station to the second station over the voice band of the voice channel;
while transmitting voice content, monitoring the voice content to detect a lull; and
responsive to detecting a lull in the voice content, transmitting a control tone in the control band of the voice channel to signal the second station to receive data;
and then sending data to the second station while continuing to simultaneously transmit voice content over the voice band of the voice channel.
4 Assignments
0 Petitions
Accused Products
Abstract
Simultaneous transmission of voice and data over the voice channel of a digital wireless communications network, such as a “cell phone” network, is reconfigurable on the fly among multiple operating modes, including a lull detection mode in which data is transferred during a lull or quiet period in the voice content. Additionally, control signaling in the voice channel, rather than over a separate control or “overhead” channel is employed to support SVD. The described system operates transparently over any wireless telecommunications system.
-
Citations
20 Claims
-
1. A method of substantially simultaneous transmission of voice content and data over a single voice channel of a digital wireless telecommunications system, a voice channel call being established between first and second stations, and the method comprising the steps of:
-
partitioning the voice channel so as to comprise at least two logical bands, including a voice band and a control band, all within the audio range of frequencies; transmitting voice content from the first station to the second station over the voice band of the voice channel; while transmitting voice content, monitoring the voice content to detect a lull; and responsive to detecting a lull in the voice content, transmitting a control tone in the control band of the voice channel to signal the second station to receive data; and then sending data to the second station while continuing to simultaneously transmit voice content over the voice band of the voice channel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A method of transmission of voice content and data over a single voice channel of a digital wireless telecommunications system, a voice channel call being established between first and second stations, and the method comprising the steps of:
-
transmitting voice content from the first station to the second station over the voice channel; transmitting a control signal to the second station over the voice channel to signal beginning transmission of data over the voice channel; after transmitting the control signal, reducing a frequency spectrum of the transmitted voice content; and while continuing to transmit voice content within the reduced frequency spectrum, commencing simultaneous transmission of data to the second station over the same voice channel. - View Dependent Claims (10, 11, 12, 13, 14, 15)
-
-
16. An asymmetrical method of transmission of voice content and data over a single voice channel of a digital wireless telecommunications system, a voice channel call being established between first and second stations, and the method comprising the steps of:
-
transmitting first voice content from the first station to the second station over the voice channel; while continuing to transmit first voice content, commencing simultaneous transmission of first data to the second station over the same voice channel; transmitting second voice content from the second station to the first station over the voice channel; blanking the said transmission of second voice content; and while the said transmission of second voice content is blanked, transmitting a burst of second data from the second station to the first station over the same voice channel. - View Dependent Claims (17, 18, 19, 20)
-
Specification