Wireless system for the communication of audio, video and data signals over a narrow bandwidth
First Claim
1. A wireless communication unit, comprising:
- at least one digital transceiver operable to transmit and receive compressed video and audio signals over a fixed bandwidth;
a controller operable to dynamically allocate the fixed bandwidth among the video and audio signals, the dynamic allocation being performed by varying the rates at which the audio and video signals are compressed;
wherein the fixed bandwidth is an RF bandwidth; and
wherein the controller performs the step of generating an error signal indicating a difference between first and second signals representing the fixed bandwidth and the bandwidth allocated to one of the audio and video signals; and
wherein the transceiver performs the steps of;
varying the compression rate of one of the audio and video signals in response to the second signal; and
varying the compression rate of the other one of the audio and video signals in response to the error signal.
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Accused Products
Abstract
A wireless communication unit for a wireless communication system transmits and receives video and audio signals over an RF bandwidth. The RF bandwidth is allocated among the audio and video signals to allow the audio and video signals to fit within the RF bandwidth. The allocation is performed by varying the rates of compression of the audio and video signals. The communication unit is applicable to subscriber units and base stations. Subscriber units such as cellular telephones can display the video images by using fast digital-to-analog converters and a dither technique. During a communication link, the subscriber unit receives a transmission header from another party on the communication link. The transmission header may include a request by the other party to change the allocation of the audio and video signals. If such a request is received, the subscriber unit automatically changes the allocation in response to the request.
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Citations
32 Claims
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1. A wireless communication unit, comprising:
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at least one digital transceiver operable to transmit and receive compressed video and audio signals over a fixed bandwidth; a controller operable to dynamically allocate the fixed bandwidth among the video and audio signals, the dynamic allocation being performed by varying the rates at which the audio and video signals are compressed; wherein the fixed bandwidth is an RF bandwidth; and wherein the controller performs the step of generating an error signal indicating a difference between first and second signals representing the fixed bandwidth and the bandwidth allocated to one of the audio and video signals; and
wherein the transceiver performs the steps of;varying the compression rate of one of the audio and video signals in response to the second signal; and varying the compression rate of the other one of the audio and video signals in response to the error signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 27, 28, 29, 30, 31, 32)
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15. A wireless system for the communication of audio and video signals over an RF bandwidth, comprising:
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a plurality of subscriber units operable to allocate the RF bandwidth among the audio and video signals; a plurality of base stations covering a geographical area divided into a plurality of cell sites, each base station being operable to establish RF communications links with the subscriber units in its cell site; and a network controller connected to the plurality of base stations; wherein each subscriber unit receives a plurality of transmission headers during a communication link, each transmission header including a number of bits indicating whether a request to change the allocation of the RF bandwidth between the video and audio signals has been made. - View Dependent Claims (16, 17, 18, 19)
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20. A mobile video telephone, comprising:
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a digital transceiver operable to transmit and receive compressed video and audio signals over an RF bandwidth; a controller operable to dynamically allocate the fixed bandwidth among the video and audio signals, the dynamic allocation being performed by varying the rates at which the audio and video signals are compressed; a display system including a flat panel display and a driver circuit utilizing a dither technique for displaying the video signal on the display; wherein the controller includes a summing junction having inputs adapted to receive first and second signals representing the fixed bandwidth and bandwidth allocated to one of the video and audio signals; and
wherein the transceiver performs the steps of;varying the compression rate of one of the audio and video signals in response to the second signal; and varying the compression rate of the other one of the signals in response to the error signal. - View Dependent Claims (21, 22, 23, 24, 25)
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26. A method of communicating digital audio and video signals within an RF bandwidth, comprising the steps of:
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compressing the audio and video signals at first and second rates, the first and second rates being adjusted to fit the audio and video signals within the RF bandwidth; combining the compressed audio and video signals into a composite signal transmitting the composite signal over an RF frequency; and further comprising the step of combining a transmission header with the audio and video signals, the transmission header including a number of bits for a request to change the allocation of the RF bandwidth among the audio and video signals.
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Specification