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# Stereo Speech-to-Text Conversion

To perform speech-to-text conversion on stereo audio input data, each channel can be processed separately. For example:

    [SpeechToText]
    0 = l,r ← audio(STEREO, input)
    1 = f1 ← frontend1(_, a:l)
    2 = nf1 ← normalizer1(_, f1)
    3 = w1 ← stt1(_, nf1)
    4 = output ← wout1(_, w1)
    5 = f2 ← frontend2(_, a:r)
    6 = nf2 ← normalizer2(_, f2)
    7 = w2 ← stt2(_, nf2)
    8 = output ← wout2(_, w2)

`0` | The `audio` module processes the input stereo audio file as left and right audio data.
`1` | The `frontend1` module converts left audio channel (`l`) into speech front-end frame data. In this step, the variable form `a:l` represents the change of name for the left channel audio data (type `l`) to audio data (type `a`).
`2` | The `normalizer1` module normalizes the frame data from `1` (`f1`).
`3` | The `stt1` module converts the normalized frame data from `2` (`nf1`) into text.
`4` | The `wout1` module writes the recognized words resulting from `3` (`w1`) to the output file.
`5` | The `frontend2` module converts right audio channel (`r`) into speech front-end frame data. In this step, the variable form `a:r` represents the change of name for the right channel audio data (type `r`) to audio data (type `a`).
`6` | The `normalizer2` module normalizes frame data from `5` (`f2`).
`7` | The `stt2` module converts the normalized frame data from `6` (`nf2`) into text.
`8` | The `wout2` module writes the recognized words resulting from `7` (`w2`) to the output file.

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