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Diffstat (limited to 'examples/spectrum/doc/src/spectrum.qdoc')
| -rw-r--r-- | examples/spectrum/doc/src/spectrum.qdoc | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/examples/spectrum/doc/src/spectrum.qdoc b/examples/spectrum/doc/src/spectrum.qdoc index e1eb9234d..64c6f8364 100644 --- a/examples/spectrum/doc/src/spectrum.qdoc +++ b/examples/spectrum/doc/src/spectrum.qdoc @@ -31,6 +31,34 @@ \ingroup audio_examples \brief The Spectrum Example uses a combination multimedia APIs to process microphone input. + The Spectrum Analyzer example shows how the \l{QtMultimedia Module} can be + used to record and then play back an audio stream. + + \image spectrum-demo.png + + Because QtMultimedia allows the application to access the raw audio + stream, the data can either be inspected or modified by the application. + The Spectrum Analyzer example displays three pieces of information while + audio is being either captured or played back: + + \list + \li Information about the raw audio stream, shown in the uppermost widget: + \list + \li The amount of data currently in the buffer, shown in blue + \li The segment of data which was most recently analysed to compute + the frequency spectrum, shown in green + \li The raw audio waveform, shown in white and scrolling from right to + left + \endlist + \li A representation of the frequency spectrum, shown at the lower left + \li The current RMS level of the audio stream, and the recent 'high + watermark' level, shown at the lower right + \endlist + + Spectrum analysis is performed by calculating the Fast Fourier Transform + (FFT) of a segment of audio data. An open-source library, + \l{http://ldesoras.free.fr/prod.html}{FFTReal}, against which the + application is dynamically linked, is used to compute the transform. */ |