How to route audio seperately using hdmi cable

[perfection]

I have a tablet and a dvd platter with hdmi out as wll as headphone/2 pin audio out sockets
I also have a home theater amp and speakers
And also an SVGA projector
Hdmi cables carry audio and video
I would like to route the video ONLY into the projector for throwing on the big screen while channelizing the audo through the 2 pin stereo cable into my home theater amplifier

my question is DOES THE HDMI CARRIED OUT AUTO CUT OFF AND ALLOW THE AUDIO COMPOSITE CABLE TO CARRY THE AUDIO OR DOES IT HAPPEN ANY OTHER WAY?

Thank you

[smrpix]

Why not just plug in some wires and try it? You won't hurt anything.

[pandy]

To remove audio You need force HDMI to DVI mode ie connect HDMI output to DVI receiver input - second option is to use HDMI capable AV receiver (amplifier), most of them have functionality to remove audio from their HDMI output.

To force HDMI to DVI mode You can use something like this:

http://www.monoprice.com/products/product.asp?c_id=101&cp_id=10114&cs_id=1011405&p_id=...ormat=2&ref=cj

[jagabo]

There's no need to remove/disable the HDMI audio, just disable the TV's (projector's) internal speakers. Most sources will output HDMI audio and RCA audio at the same time.

[perfection]

Thank you

[usually_quiet]

To remove audio You need force HDMI to DVI mode ie connect HDMI output to DVI receiver input - second option is to use HDMI capable AV receiver (amplifier), most of them have functionality to remove audio from their HDMI output.

To force HDMI to DVI mode You can use something like this:

http://www.monoprice.com/products/product.asp?c_id=101&cp_id=10114&cs_id=1011405&p_id=...ormat=2&ref=cj

Powered A/V converters are normally one-way, unless the description says they are bi-directional. The link provided is for a device that converts DVI and S/PDIF input to HDMI output.

There is a very good chance that device would provide DVI video output when used in the opposite direction because HDMI and DVI are pin-for-pin compatible for video. However, it is very unlikely to provide audio output when used in the wrong direction. There are other devices designed to go from HDMI input to DVI plus S/PDIF output. This is one example http://www.startech.com/AV/Converters/Video/HDMI-to-DVI-D-with-SPDIF-Audio-Converter~HDMI2DVI

A simple HDMI to DVI cable would work just as well as a powered converter when audio output is not needed, and they are much less expensive. http://www.monoprice.com/products/product.asp?c_id=102&cp_id=10231&cs_id=1023104&p_id=...seq=1&format=2

[pandy]

Powered A/V converters are normally one-way, unless the description says they are bi-directional. The link provided is for a device that converts DVI and S/PDIF input to HDMI output.

HDMI and DVi are one way interfaces, except CEC and EDID there is no bidirectional data exchange ( ecxcept new lines introduced in HDMI 1.4 for ARC and Ethernet)

There is a very good chance that device would provide DVI video output when used in the opposite direction because HDMI and DVI are pin-for-pin compatible for video.

HDMI is backward compatible with DVI - this is mandatory, usualy DVI offer higher compatibility due lack of additinioal data and simpler video data representation (RGB color model + not limited quantization range).

However, it is very unlikely to provide audio output when used in the wrong direction. There are other devices designed to go from HDMI input to DVI plus S/PDIF output. This is one example http://www.startech.com/AV/Converters/Video/HDMI-to-DVI-D-with-SPDIF-Audio-Converter~HDMI2DVI

This alternative solution however forcing HDMI source to DVI (i.e. by connecting DVI sink to HDMI source) can be beneficial due of way how DVI and HDMI are defined as standard (less problems with additional data etc.), also some people suggest that at least at some cass DVI2HDMI fom link i've provided can be used to remove HDCP which is additional source of problems especially for some older DVI/HDMI devices.

A simple HDMI to DVI cable would work just as well as a powered converter when audio output is not needed, and they are much less expensive. http://www.monoprice.com/products/product.asp?c_id=102&cp_id=10231&cs_id=1023104&p_id=...seq=1&format=2

No, it will not work as DVI and HDMI are electrically and logically compatible and HDMI can be run over DVI cabling if both devices (source and sink) are HDMI. Information about type of sink (DVI/HDMI) is provided by sink on EDID.

[usually_quiet]

Powered A/V converters are normally one-way, unless the description says they are bi-directional. The link provided is for a device that converts DVI and S/PDIF input to HDMI output.

HDMI and DVi are one way interfaces, except CEC and EDID there is no bidirectional data exchange ( ecxcept new lines introduced in HDMI 1.4 for ARC and Ethernet)

Your misunderstood what I mean by bi-directional. I meant that the device in question should only be used in one direction, to connect a DVI source and S/PDIF source to a HDMI sink. It is not designed to be used in the opposite direction, to connect a HDMI source to a DVI sink and S/PDIF input.

[Edit 1]If you intended that the OP should connect the Monoprice DVI and S/PDIF to HDMI converter in the correct direction (DVI in and HDMI out), you should have said how to do that. An HDMI to DVI cable would be needed to connect an HDMI source with the DVI port on the converter, but you never mentioned using one. [End Edit 1]

There is a very good chance that device would provide DVI video output when used in the opposite direction because HDMI and DVI are pin-for-pin compatible for video.

HDMI is backward compatible with DVI - this is mandatory, usualy DVI offer higher compatibility due lack of additinioal data and simpler video data representation (RGB color model + not limited quantization range).

That is exactly what I meant when I said "HDMI and DVI are pin-for-pin compatible for video". [Edit 3]However I have changed my opinion that the Monoprice DVI and S/PDIF to HDMI converter could work backwards. I no longer think that is probable.[End]

However, it is very unlikely to provide audio output when used in the wrong direction. There are other devices designed to go from HDMI input to DVI plus S/PDIF output. This is one example http://www.startech.com/AV/Converters/Video/HDMI-to-DVI-D-with-SPDIF-Audio-Converter~HDMI2DVI

This alternative solution however forcing HDMI source to DVI (i.e. by connecting DVI sink to HDMI source) can be beneficial due of way how DVI and HDMI are defined as standard (less problems with additional data etc.), also some people suggest that at least at some cass DVI2HDMI fom link i've provided can be used to remove HDCP which is additional source of problems especially for some older DVI/HDMI devices.

Where does anyone say that the particular Monoprice DVI and S/PDIF to HDMI converter you linked to removes HDCP? The device's description and customer reviews don't mention HDCP at all, let alone that the device strips HDCP.

It probably does not remove HDCP. It is illegal to remove HDCP in the USA. If a device is designed to strip HDCP from DVI or HDMI, US retailers who sell one face legal action. A big retailer like Monoprice wouldn't take the risk. If a US resident wants a device that is guaranteed to strip HDCP and provides HDMI or DVI output, they need to order it from China.

[Edit 3] I finally found a DVI and S/PDIF to HDMI converter that users claim strips HDCP, although it isn't from Monoprice. It is from Cables Unlimited. I'll accept the claim that some of these converters can strip HDCP[End Edit 3]

A simple HDMI to DVI cable would work just as well as a powered converter when audio output is not needed, and they are much less expensive. http://www.monoprice.com/products/product.asp?c_id=102&cp_id=10231&cs_id=1023104&p_id=...seq=1&format=2

No, it will not work as DVI and HDMI are electrically and logically compatible and HDMI can be run over DVI cabling if both devices (source and sink) are HDMI. Information about type of sink (DVI/HDMI) is provided by sink on EDID.

A normal DVI connection doesn't support audio input, so it doesn't matter if the cable can physically carry it. HDMI to DVI cables are used by many people to connect HDMI output from a PC to a DVI monitor or TV. They work just fine for supplying video. Audio must be provided using an additional connection.

The DVI spec doesn't assign pins for carrying audio, nor are DVI inputs on consumer electronics used to provide audio. That is why the Startech HDMI to DVI and S/PDIF converter exists, to provide a usable audio connection from an HDMI source for devices that only have DVI input.

[Edit 2]In any case jagabo's solution makes far more sense than using additional cables or powered converters. TVs and projectors that accept HDMI input normally provide a setting that disables their speakers.[End Edit 2]

[pandy]

Your misunderstood what I mean by bi-directional. I meant that the device in question should only be used in one direction, to connect a DVI source and S/PDIF source to a HDMI sink. It is not designed to be used in the opposite direction, to connect a HDMI source to a DVI sink and S/PDIF input.

You wrote:

Powered A/V converters are normally one-way, unless the description says they are bi-directional.

There is no misunderstood frrm my side - bidirectional means bidirectional - opposite to unidirectional i.e. way how DVI/HDMI works.

[Edit 1]If you intended that the OP should connect the Monoprice DVI and S/PDIF to HDMI converter in the correct direction (DVI in and HDMI out), you should have said how to do that. An HDMI to DVI cable would be needed to connect an HDMI source with the DVI port on the converter, but you never mentioned using one. [End Edit 1]

Due different connectors (size and construction) this is quite obvious that for connecting HDMI source with DVI sink You need or cable or adapter which provide from one side HDMI and from second DVI plug.

There is a very good chance that device would provide DVI video output when used in the opposite direction because HDMI and DVI are pin-for-pin compatible for video.

IC for HDMI or for DVI are unidirectional - there is separate transmitter and separate receiver - data data flow determined from input (receiver) to output (transmitter).

That is exactly what I meant when I said "HDMI and DVI are pin-for-pin compatible for video". [Edit 3]However I have changed my opinion that the Monoprice DVI and S/PDIF to HDMI converter could work backwards. I no longer think that is probable.[End]

See my earlier comment - this is not possible so You always need to be sure - ordering or DVI to HDMI or HDMI to DVI (or for example HDMI to VGA, VGA to HDMI etc) however functionality for such devices can be changed only be correct EDID so some of those converters can work as DV/HDMI to HDMI/DVI but this imply correct EDID and way how receiver and transmitter are programmed.

However, it is very unlikely to provide audio output when used in the wrong direction. There are other devices designed to go from HDMI input to DVI plus S/PDIF output. This is one example http://www.startech.com/AV/Converters/Video/HDMI-to-DVI-D-with-SPDIF-Audio-Converter~HDMI2DVI

Yes but this mean that conversion from HDMI to DVI is performed by converter and fully depend on quality of converter, i've proposed converter with DVI input because it will force source to DVI mode ie conversion is performed by source (and usually source is more complex terms for functionality and for example can perform resizing, deinterlacing because DVI prefer progressive video modes)

Where does anyone say that the particular Monoprice DVI and S/PDIF to HDMI converter you linked to removes HDCP? The device's description and customer reviews don't mention HDCP at all, let alone that the device strips HDCP.

It probably does not remove HDCP. It is illegal to remove HDCP in the USA. If a device is designed to strip HDCP from DVI or HDMI, US retailers who sell one face legal action. A big retailer like Monoprice wouldn't take the risk. If a US resident wants a device that is guaranteed to strip HDCP and provides HDMI or DVI output, they need to order it from China.

[Edit 3] I finally found a DVI and S/PDIF to HDMI converter that users claim strips HDCP, although it isn't from Monoprice. It is from Cables Unlimited. I'll accept the claim that some of these converters can strip HDCP[End Edit 3]

There are multipple sources for information how perform recording from PS3 with Blackmagic Intensity (HDMI capture card without HDCP support) it imply removing HDCP from stream and seems that those converters with DVI input are able to remove HDCP (by accident or intentionally).

A normal DVI connection doesn't support audio input, so it doesn't matter if the cable can physically carry it. HDMI to DVI cables are used by many people to connect HDMI output from a PC to a DVI monitor or TV. They work just fine for supplying video. Audio must be provided using an additional connection.

The DVI spec doesn't assign pins for carrying audio, nor are DVI inputs on consumer electronics used to provide audio. That is why the Startech HDMI to DVI and S/PDIF converter exists, to provide a usable audio connection from an HDMI source for devices that only have DVI input.

DVI and HDMI can use same cable, HDMI source is able to distinguish between DVI or HDMI based on information provided by sink (or DVI or HDMI) in EDID. Audio data are transmitted not on special lines (wires) but together with video data (during so called Blanking Intervals). DVI transmit full video signal and also BI signals, HDMI use this data (time occupied by BI signals in DVI - this is particularly visible when source is forced to use pixel repetition mode to provide enough bandwidth for more demanding schemes of uncompressed audio- check CEA861 + HDMI specification if You need more data) to transmit various information + audio data - this is why i recommend to force HDMI source to DVI mode by connecting DVI sink to HDMI source - source will provide (should) best possible configuration from video source point of view.

[usually_quiet]

@pandy

Originally Posted by pandy

Originally Posted by usually_quiet
[Edit 1]If you intended that the OP should connect the Monoprice DVI and S/PDIF to HDMI converter in the correct direction (DVI in and HDMI out), you should have said how to do that. An HDMI to DVI cable would be needed to connect an HDMI source with the DVI port on the converter, but you never mentioned using one. [End Edit 1]

Due different connectors (size and construction) this is quite obvious that for connecting HDMI source with DVI sink You need or cable or adapter which provide from one side HDMI and from second DVI plug.

It was not initially apparent to me, and it surely won't be obvious to everyone who comes across this thread. For future reference, it is necessary to describe how connections are to be made when writing for this forum. There are more newbies than experts who come here looking for help. Not everyone will know how to make the necessary connections, or what cables they need.

There is no point carrying this discussion any further. You and I don't understand each other and never will.

[Edit]I changed my mind. There is one more thing that I want to say. Forcing an HDMI source into DVI mode is only a good idea when you have no choice. For example, you are using a source that only has HDMI-out with an older TV or projector that only has DVI-in.
[End Edit]