Method of digital audio/video channel change and corresponding apparatus
The present invention generally relates to digital communications, and more particularly, to a technique for processing data in a digital communication device so as to reduce channel change times. To this effect, the invention comprises a specific sequencing and arrangement of operations that are required to be executed in the digital communication device during a channel change.
1. A method of reducing digital audio/video channel change delay in a digital audio/video receiver device connected to a network comprising an audio/video stream server, the method being implemented by said digital audio/video receiver device, said method comprising:
detecting a user request to change from a current channel to a next channel;
following said detecting a user request to change from a current channel to a next channel and before sending over said network a request to said audio/video stream server to start receiving from said audio/video stream server a second audio/video stream from the next channel, sending over said network a request to said audio/video stream server to stop receiving from said audio/video stream server a first audio/video stream from the current channel;
following said sending over said network a request to said audio/video stream server to stop receiving from said audio/video stream server a first audio/video stream from the current channel, sending over said network a request to said audio/video stream server to start receiving from said audio/video stream server a second audio/video stream from the next channel;
following said sending over said network a request to said audio/video stream server to start receiving from said audio/video stream server a second audio/video stream from the next channel, receiving, from said audio/video stream server, second audio/video data comprised in said second audio/video stream from said next channel;
storing of said received second audio/video data in a memory;
stopping an audio/video decoder of said digital audio/video receiver from decoding first audio/video data from the current channel, after sending over said network the request to said audio/video stream server to stop receiving from said audio/video stream server said first audio/video data from the current channel and after sending over said network the request to said audio/video stream server to start receiving, from said audio/video stream server, second audio/video data from the next channel;
reinitializing resources of the digital audio/video receiver for processing the second audio/video data, after sending over said network the request to said audio/video stream server to stop receiving from said audio/video stream server said first audio/video data from the current channel and after sending over said network the request to said audio/video stream server to start receiving, from said audio/video stream server, second audio/video data from the next channel; and
starting said audio/video decoder of said digital audio/video receiver to decode said received second audio/video data stored in said memory.
2. The method according to claim 1 , further comprising determining if a sum of a first bit rate of the first audio/video stream and of a second bit rate of the second audio/video stream is below a downlink bandwidth for transmission of audio/video streams to the digital audio/video receiver device, and
if the sum is below the downlink bandwidth, the request sent to said audio/video stream server to stop receiving from said audio/video stream server the first audio/video stream is sent after the request sent to said audio/video stream server to start receiving from said audio/video stream server the second audio/video stream, whereas
if the sum is not below the downlink bandwidth, the request sent to said audio/video stream server to stop receiving from said audio/video stream server the first audio/video stream is sent to said audio/video stream server before the request to start receiving the second audio/video stream is sent to the audio/video stream server.
3. The method according to claim 2 , wherein the bit rate of the first audio/video stream from the current channel and/or the bit rate of the second audio/video stream from the next channel is determined through:
bit rate values obtained from measurements done by a device implementing the method on bit rates of the first audio/video stream from the current channel and/or the second audio/video stream from the next channel during previous reception of the streams; and/or
bit rate values of the first audio/video stream from the current channel and the second audio/video stream from the next channel received from a server connected to the device.
4. The method according to claim 2 , wherein the downlink bandwidth is obtained from:
a preconfigured downlink bandwidth stored in a memory; and/or
an estimation of downlink bandwidth obtained through measurement of network traffic.
5. The method according to claim 1 , wherein the method further comprises, initializing memory resources for reception of data from the second audio/video stream from the next channel.
6. A device for reception of digital audio/video, the device being configured to be connected to a network comprising an audio/video stream server, the device comprising:
a memory;
a processor coupled to the memory, the processor being configured to:
determine a bit rate of a first received audio/video stream from a current channel;
determine a bit rate of a second audio/video stream to be received from a next channel;
determine if a sum of a first bit rate of the first audio/video stream from the current channel and of a second bit rate of the second audio/video stream from the next channel is below a downlink bandwidth for transmission of audio/video streams to the device;
if the sum is below the downlink bandwidth, send over said network a request to stop receiving from said audio/video stream server the first audio/video stream from the current channel after sending over the network a request to said audio/video stream server to start receiving from said audio/video stream server the second audio/video stream from the next channel; and
if the sum is not below the downlink bandwidth, send over said network the request to said audio/video stream server to stop receiving from said audio/video stream server the first audio/video stream from the current channel before sending over the network the request to the audio/video stream server to start receiving from said audio/video stream server the second audio/video stream from the next channel.
7. The device according to claim 6 , wherein the device is a mobile terminal.
8. The device according to claim 6 , wherein the device is a Set Top Box receiver for reception of digital audio/video streams.
9. The device according to claim 6 , wherein the device is a digital television set with an integrated receiver for reception of digital audio/video streams.
10. A Set Top Box device for reception of digital audio/video streams from an audio/video stream server connected to said Set Top Box via a network, said Set Top Box device comprising:
an integrated receiver for reception of digital audio/video streams from said audio/video stream server; and
integrated circuitry configured to:
determine a bit rate of a first received digital audio/video stream from a current channel;
determine a bit rate of a second digital audio/video stream to be received from a next channel;
determine if a sum of a first bit rate of the first audio/video stream from the current channel and of a second bit rate of the second audio/video stream from the next channel is below a downlink bandwidth for transmission of audio/video streams to the device; and
when the sum is below the downlink bandwidth, transmit over said network a request to said audio/video stream server to stop receiving from said audio/video stream server the first audio/video stream from the current channel after sending over said network a request to said audio/video stream server to start receiving from said audio/video stream server the second audio/video stream from the next channel; and
when the sum is not below the downlink bandwidth, transmit over the network the request to said audio/video stream server to stop receiving from the audio/video stream server the first audio/video stream from the current channel before sending over the network the request to the audio/video stream server to start receiving from the audio/video stream server the second audio/video stream from the next channel.
11. The device according to claim 6 , wherein the processor is further configured to:
stop an audio/video decoder of the device from decoding the first audio/video stream from the current channel after sending over said network the request to said audio/video stream server to stop receiving from said audio/video stream server the first audio/video stream from said audio/video stream server from the current channel and after sending over said network the request to said audio/video stream server to start receiving from said audio/video stream server the second audio/video stream from the next channel; and
reinitialize resources of a digital audio/video receiver for processing the second audio/video stream from the next channel, after sending over said network the request to said audio/video stream server to stop receiving from said audio/video stream server the first audio/video stream from the current channel and after sending over said network the request to said audio/video stream server to start receiving from said audio/video stream server the second audio/video stream from the next channel.
12. The device according to claim 10 , wherein the integrated circuitry is further configured to:
stop an audio/video decoder of the device from decoding the first audio/video stream from the current channel after sending over said network the request to said audio/video stream server to stop receiving the first audio/video stream from the current channel and after sending over said network the request to said audio/video server to start receiving from said audio/video stream server the second audio/video stream from the next channel; and
reinitialize resources of a digital audio/video receiver for processing the second audio/video stream from the next channel, after sending over said network the request to said audio/video stream server to stop receiving the first audio/video stream from the current channel and after sending over said network the request to said audio/video stream server to start receiving from said audio/video stream server the second audio/video stream from the next channel.
13. The device according to claim 10 , wherein the bit rate of the first audio/video stream from the current channel and/or the bit rate of the second audio/video stream from the next channel is at least partially based on bit rate values obtained from measurements during previous reception of streams; and/or bit rate values of the first audio/video stream from the current channel and the second audio/video stream from the next channel received from a server connected to the Set Top Box.
14. The device according to claim 10 , wherein the downlink bandwidth is obtained from a preconfigured downlink bandwidth stored in a memory; and/or an estimation of downlink bandwidth obtained through measurement of network traffic.
15. The device according to claim 10 , wherein the integrated circuitry is further configured to initialize memory resources for reception of data from the second audio/video stream from the next channel.
16. A digital audio/video receiver device, the device being configured to be connected to a network comprising an audio/video stream server, the device comprising:
a memory;
an audio/video decoder;
a central processor coupled to the memory, the central processor being configured to:
detect a user request to change from a current channel to a next channel;
send over said network a request to said audio/video stream server to stop receiving from said audio/video stream server a first audio/video stream from the current channel;
send over said network a request to said audio/video stream server to start receiving from said audio/video stream server a second audio/video stream from the next channel;
receive, from said audio/video stream server, second audio/video data comprised in said second audio/video stream from said next channel;
store said second audio/video data in the memory;
stop said audio/video decoder from decoding first audio/video data from the current channel, after sending over said network the request to the audio/video stream server to stop receiving from the current channel and after sending over said network the request to the audio/video stream server to start receiving from the next channel;
reinitialize resources of the digital audio/video receiver for processing the second audio/video data, after sending over said network the request to the audio/video stream server to stop receiving from the current channel and after sending over said network the request to the audio/video stream server to start receiving from the next channel; and
start said audio/video decoder to decode said second audio/video data stored in said memory.
17. The device of claim 16 , wherein the central processor is further configured to:
determine if a sum of a first bit rate of the first audio/video stream from the current channel and of a second bit rate of the second audio/video stream from the next channel is below a downlink bandwidth for transmission of audio/video streams to the device, and
if the sum is below the downlink bandwidth, send over said network the request to the audio/video stream server to stop receiving from the audio/video stream server the first audio/video stream from the current channel after sending over the network the request to the audio/video stream server to start receiving from the audio/video stream server the second audio/video stream from the next channel; and
if the sum is not below the downlink bandwidth, send over the network the request to said audio/video stream server to stop receiving from said audio/video stream server the first audio/video stream from the current channel before sending over the network the request to the audio/video stream server to start receiving from the audio/video stream server the second audio/video stream from the next channel.
18. The device of claim 17 , wherein the central processor is further configured to determine the bit rate of the first audio/video stream from the current channel and/or the bit rate of the second audio/video stream from the next channel based at least partially on at least one of bit rate values obtained from measurements, bit rates of the first audio/video stream from the current channel and/or the second audio/video stream from the next channel during previous reception of the streams, and bit rate values of the first audio/video stream from the current channel and the second audio/video stream from the next channel received from a server.
19. The device of claim 17 , wherein the central processor is further configured to obtain the downlink bandwidth from at least one of a preconfigured downlink bandwidth stored in a memory and an estimation of downlink bandwidth obtained through measurement of network traffic.
20. The device claim 16 , wherein the central processor is further configured to initialize memory resources for reception of data from the second audio/video stream from the next channel.
21. A method for reception of digital audio/video from an audio/video stream server, the method being implemented by a digital audio/video receiver device connected to said audio/video stream server via a network, the method comprising:
determining, using integrated circuitry of a central processor, a bit rate of a first received audio/video stream from a current channel;
determining, using the central processor, a bit rate of a second audio/video stream to be received from a next channel;
determining, using the central processor, if a sum of a first bit rate of the first audio/video stream from the current channel and of a second bit rate of the second audio/video stream from the next channel is below a downlink bandwidth for transmission of audio/video streams to the device; and
when the sum is below the downlink bandwidth, transmitting, over the network and using the central processor, a request to the audio/video stream server to stop receiving from the audio/video stream server the first audio/video stream from the current channel after transmission over the network a request to the audio/video stream server to start receiving from the audio/video stream server the second audio/video stream from the next channel; and
when the sum is not below the downlink bandwidth, transmitting, over the network and using the central processor, the request to the audio/video stream server to stop receiving from the audio/video stream server the first audio/video stream from the current channel before transmitting the request to the audio/video stream server to start receiving the second audio/video stream from the next channel.
22. The method of claim 21 , further comprising:
stopping an audio/video decoder from decoding the first audio/video stream from the current channel after sending over the network the request to the audio/video stream server to stop receiving from the audio/video stream server the first audio/video stream from the current channel and after sending over the network the request to the audio/video stream server to start receiving from the audio/video stream server the second audio/video stream from the next channel; and
reinitializing resources of a digital audio/video receiver for processing the second audio/video stream from the next channel, after sending over the network the request to the audio/video stream server to stop receiving from the audio/video stream server the first audio/video stream from the current channel and after sending over the network the request to the audio/video stream server to start receiving from the audio/video stream server the second audio/video stream from the next channel.
23. The method of claim 21 , wherein the bit rate of the first audio/video stream from the current channel and/or the bit rate of the second audio/video stream from the next channel is at least partially based on bit rate values obtained from measurements during previous reception of streams; and/or bit rate values of the first audio/video stream from the current channel and the second audio/video stream from the next channel received from a server.
24. The method of claim 21 , further comprising obtaining, using the central processor, the downlink bandwidth from at least one of a preconfigured downlink bandwidth stored in a memory; and/or an estimation of a downlink bandwidth.
25. The method of claim 21 , further comprising initializing, using the central processor, memory resources for reception of data from the second audio/video stream from the next channel.