Devices for transmitting digital video and data over the same wires
A method of transmitting a data stream over a communication channel, the method comprising: providing symbol sets having different numbers of symbols; modulating data in the data stream that warrant different degrees of protection against noise onto symbols from symbol sets having different numbers of symbols, wherein which symbol set given data in the stream is modulated onto is independent of symbol sets onto which other data in the data stream is modulated onto; and transmitting the symbols.
1. A wired communication link comprising:
a first transceiver configured to send a downstream packet-based transmission of lossless high definition digital video over a first physical medium comprising at least one conductive wire;
the first transceiver is further configured to send a downstream packet-based transmission of bidirectional data over a second physical medium comprising at least one conductive wire; wherein the first physical medium and the second physical medium have at least one common wire, and the common wire is also used to transfer, by a second transceiver, an upstream transmission of the bidirectional data channel;
the first and second transceivers are further configured to send and receive the upstream and downstream transmissions over at least partially overlapping frequency bands; and
a packet error detection mechanism configured to accept some packets that are detected as erroneous.
2. The wired communication link of claim 1 , wherein the downstream packet-based transmission of the lossless high definition digital video is transmitted using a first modulation and the downstream packet-based transmission of the bidirectional data is transmitted using a second modulation.
3. The wired communication link of claim 2 , wherein the different modulations provide different levels of protection against noise.
4. The wired communication link of claim 3 , wherein the different modulations are pulse amplitude modulations.
5. The wired communication link of claim 3 , wherein the different modulations use at least partially overlapping subsets of the same symbol set.
6. The wired communication link of claim 5 , wherein the symbol set is PAM-16.
7. The wired communication link of claim 2 , wherein the packet header of the downstream packet-based transmission of the lossless high definition digital video comprises a first data type and the packet payload comprises a second data type.
8. The wired communication link of claim 1 , wherein some packets, comprising selected data types, are transmitted without an error indication overhead.
9. The wired communication link of claim 1 , wherein at least some of the packets comprising video pixels do not comprise an error indication overhead.
10. The wired communication link of claim 1 , wherein the lossless high definition digital video is an uncompressed high definition digital video.
11. The wired communication link of claim 10 , wherein the communication link does not initiate a retransmission for some of the packets that are detected as erroneous.
12. The wired communication link of claim 1 , wherein the downstream transmission of lossless high definition digital video and the downstream transmission of bidirectional data are multiplexed.
13. The wired communication link of claim 10 , wherein the uncompressed high definition digital video is selected from the group of: DVI, HDMI, and DisplayPort.
14. The wired communication link of claim 10 , wherein the communication link further transmits audio data.
15. The wired communication link of claim 14 , wherein the audio-video synchronization is based on the order in which the pixel data and the audio data are received.
16. The wired communication link of claim 10 , wherein the bidirectional data comprises multimedia control signal data.
17. The wired communication link of claim 16 , wherein the bidirectional data comprises one or more of the following: DVI control signal data, HDMI control signal data, DisplayPort control signal data, 12C, CEC, HPD, 5V indication, or a combination thereof.
18. The wired communication link of claim 16 , wherein the bidirectional data comprises Ethernet.
19. The wired communication link of claim 1 , wherein the upstream transmission of the bidirectional data channel is transferred over the common wire in full duplex mode.