På Apples hemsida hittar du en del under "developer". Men att den har en krets som kallas Snapper säger egentligen ingenting mer än att Apple kallar den så. Det kan vara ESS, AvanceLogic eller nåt helt egenutvecklat. Det står inget om brus och andra intressanta saker. Förmodligen för att de skall kunna byta ut chipen lite emellanåt när de hittar bättre och billigare utan att behöva skriva att de gjort det. Mina öron säger att det inbyggda ljudet är i klass med ett enkelt ljudkort till PC i 200-400kr klassen.
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The PowerBook G4 –12 inch computer has sound circuitry, called Snapper, that is connected to the Intrepid IC by a standard I2S bus. The Intrepid IC provides DB-DMA (descriptor-based direct memory access) support for the I2S port.
The sound circuitry includes a signal processing IC that handles the equalization and volume control functions and a codec IC that performs A-to-D and D-to-A conversion.
All audio is handled digitally inside the computer. The Snapper circuitry performs digital-to-analog conversion for the audio signals to the three internal speakers and the headphone mini-jack. The mid-range enhancer speaker is internal to the unit and is not visible. All audio signal conditioning is done in hardware and no user-level controls exist. The Snapper circuitry also provides parametric equalization for the internal speakers.
Modem progress audio is connected as a digital input to the sound circuitry so that it can be mixed into the sound output stream. The modem progress audio is processed as play-through only, not as a digital sound source.
Stereo signals from the audio input jack are routed to an analog line input buffer that drives the internal A/D converter. For information about sound system operation, see “Sound System”.
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