Audi Mmi Cable Usb C

[Patrice Mieczkowski]

VAC creates a set of virtual audio devices. Each device simulates an audio adapter (usually named a "card") whose output is internally connected to the input, making an audio loopback. If an application plays audio to the output of such device, the sound will not be audible because the signal is looped back to the input. But if another application records from the input, it receives the sound produced by the first app.

Such virtual devices are named Virtual Cables. The term "Virtual Cable" is used only in the description of VAC product, as a placeholder. Actual names of virtual audio devices/endpoints that you will see in applications' menus, are different (for example, "Line 1", "Line 2" etc.).

Each side of any Virtual Cable can be used by several audio apps at the same time. If two or more apps play sounds to the same playback endpoint, these sounds are mixed, and the result is transmitted to the recording side. It two or more apps record from the same endpoint, each app gets a copy of the sound.

There is no quality loss (if no format conversion and/or volume control are involved). If all these conditions are met, audio transfer is bitperfect, suitable for audiophile applications. In well-tuned systems, signal latency is very low.

VAC just performs things what it is intended for: passes audio streams between applications, converting audio formats if necessary. It never guides you to advertising pages, nor pops up busily on the screen, nor installs hidden activities in your system. VAC does only actions that you explicitly demand for.

VAC driver and the supplied applications can only collect and use information directly related to their functionality. For example, VAC driver can query processor functions to optimize performance, request process/thread information to display it in a log, Audio Repeater applications request audio device/endpoint properties, etc. Since they do not work with personal, business, geographical, economic or political data, they do not access such data sources at all.

I'm currently setting up a older system in a new case (i'll be upgrading it in stages, and the old parts then go back into the old case ;p), and i'm having a bit of confusion over which cable to use, and what the difference is.

The cable looks somewhat like this , with the AC 97 connector attached to the HD audio connector. They both appear to have the same kind of connector (right down to the 'key' - the space where there's no pin and its filled up), apparently the same colour codes at close inspection and so on.

What's the difference between these cables, and when do i know what to use? In my case the sound chip is a ALC888 but i'm more interested in a generic, all purpose answer, rather than one specific to this. The header on the system itself is marked 'Audio'.

The correct one to use depends on your case. Those cables are typically used to connect front panel headphone/microphone ports. While the connectors may look identical, the pinouts are different and not really interchangeable. The matching connector on your case should be labelled accordingly, I know mine is labelled HD Audio.

Some sources indicate that it is/may be necessary to switch audio output modes in the BIOS configuration or with a jumper. It is recommended that you look at your motherboard manual. My own motherboard (MSI P67A-C45) manual just says it's compliant with the Intel Front Panel I/O Connectivity Design Guide, not all that much information. Dell manuals describe it as front audio (F_AUDIO) and don't indicate any such jumper, and only describe the BIOS option Onboard Audio Controller as Enabled or Disabled (Enabled by default).

On AC97 audio to the rear audio output was looped by the front audio output and plugging in a device to the front panel audio output would electrically disconnect the rear audio output from the audio source. If you wanted to use an AC97 motherboard without front panel audio it was nessacery to put jumpers on the audio header to make the rear audio output work.

On HDA audio to the front and rear outputs comes from seperate outputs on the audio codec. The pins that were previously used to loop back audio from the front are repurposed as connector-detect pins. It is up to software whether to disable the rear panel audio output when a connector is plugged into the front panel output.

If you plug an AC97 front panel into a HDA motherboard then plugin detection will not work correctly, it may detect devices as not present when they are present and vice-versa and the exact results may depend on what audio is playing. On some motherboards it may be possible to disable the plug-in detection so they can work better (though still not perfectly) with an AC97 front panel.

Your particular front panel looks to me like it is primerally designed for HD audio motherboards but with a hack to give limited support for AC97 boards. There are loops of wire on the AC97 connectors which will make the rear output work but it won't be switched by the front panel connectors like it would be with a proper AC97 front panel.

I'm not sure of the exact different (I assume that HD audio will gives better audio quality) but I'll always go for HD audio if the mainboard has it, if the mainboard only has AC97 then I'll use AC97 connector.

I have completed a modification to my AC97 female plug, by fiting a (Pin/socket) to socket 4 position for the 1K resistor to ground, and fitting a two pole switch to the front panel Cutting the two FP return wires at the Jack sockets and connecting them to the contacks of the switch.The FP wires are left connected to pins 6 & 10 at the plug. Provided a 5 volt DC cable to the poles on the switch from the motherboard. SEE PDF here.,,

AC97 cables usually have an empty socket in pin location 4. On the other hand HD audio cables have a wire and terminal connecttor lurking there, waiting silently in that cold dark hole poised and ready for the time when a naive unsuspecting pin 4 (who isn't even old enough to leave his motherboard) slips into the High Definition Audio clutches of that extra wire.. .

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