Differential to Single mode conversion?

Hi Everybody,

Currently developing a PCI host card to host a wireless modem The modem has a differential speaker output and a differential mic input. My problem is that i want to connect these audio ports to their corresponding ports on a PCI sound card in the same system, which has single ended input/outputs. If i do this directly then i will end up grounding one side of each differential pair.
I have thought of using a audio transformer to convert from differential mode to single mode and vice versa. However i am not sure of the circuitry/ components etc
The output speaker differential impedance is 1 Ohm and the mic input differential impedance is 20K.

I would appreciate any help i can get with this.

Just use one connection to each and ground. Ignore the second speaker wire, but ground the second mike wire.

Thanks Nigel.

Just to make sure i understand this correctly -

If i connect the differential speaker output from the wireless module to the single ended mic input on the soundcard - the signal amplitude will be halved,however the signal integrity should remain unchanged?

Does the same apply when i connect the single ended speaker output from the soundcard to the differential microphone input on the wireless module?

stevoamm said:

Thanks Nigel.

Just to make sure i understand this correctly -

If i connect the differential speaker output from the wireless module to the single ended mic input on the soundcard - the signal amplitude will be halved,however the signal integrity should remain unchanged?

Click to expand...

Yes.

Does the same apply when i connect the single ended speaker output from the soundcard to the differential microphone input on the wireless module?

Click to expand...

Yes, but you must connect the unused input to ground.