Mixing Mono Samples with Stereo Samples, Audio DSP using C# Options

[AltAudio]

Hello,

I've got two streams of audio sample that are stored in arrays, one mono and one stereo. I'd like to mix the mono into the stereo stream and output as stereo. Any known examples to accomplish?

Thanks in advance.........Mick

[AltAudio]

How about converting the mono to stereo (two identical tracks) and then mixing normally?

Yes that's reasonable. I could convert the mono easily, so then what is the mixing normally part? Is it fairly straight-forward?

[db1989]

It’s one of the simplest operations that can be performed upon audio streams, so yes. Mixing two PCM streams (assuming the same sampling rate, bit-depth, and sign) is done simply by generating a new stream, each of whose samples is the mean of the corresponding two samples from the respective source files, i.e. output(sampleNumber)=(stream1(sampleNumber)+stream2(sampleNumber))/2.

This post has been edited by db1989: Apr 19 2012, 16:20

[AltAudio]

It’s one of the simplest operations that can be performed upon audio streams, so yes. Mixing two PCM streams (assuming the same sampling rate, bit-depth, and sign) is done simply by generating a new stream, each of whose samples is the mean of the corresponding two samples from the respective source files, i.e. output(sampleNumber)=(stream1(sampleNumber)+stream2(sampleNumber))/2.

Ok, but what you describe here is creating a mono stream from stereo, correct? What I need is to mix two stereo streams.

[db1989]

Ok, but what you describe here is creating a mono stream from stereo, correct? What I need is to mix two stereo streams.

I was referring to your mixing one stream from two, those being your actual stereo stream and the doubled-up stereo version of your mono stream.

pdq has a good point, but the same ‘algorithm’ should work just as well for arrays consisting of alternating left and right samples.