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PATH Hardware Documentation
> PowerBook G3 Series 1999
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The 16-bit stereo audio circuitry provides high-quality sound input and output through the built-in microphone and speakers. The user can also connect external input and output devices by way of the sound input and output jacks.
The sound system is based on the Screamer codec IC along with input and output amplifiers and signal conditioners. The Screamer codec supports three channels of digital sound: two stereo channels plus a multiplexed channel. The sound system supports sample sizes up to 16 bits and sample rates of 11.025 kHz, 22.05 kHz, and 44.1 kHz.
The frequency response of the sound circuits, not including the microphone and speakers, is within plus or minus 2 dB from 20 Hz to 20 kHz. Total harmonic distortion and noise is less than 0.05 percent with a 1-V rms sine wave input. The signal-to-noise ratio (SNR) is 85 dB, with no audible discrete tones.
