Technical information

CHAPTER 3
Devices and Ports
Sound System 55
Sound System 3
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.
Sound Inputs 3
The sound system accepts inputs from five possible sources:
■ built-in microphone
■ external stereo sound input jack
■ 1-bit sound from the CardBus socket
■ sound from the expansion bay
■ sound from the communication (modem) slot
800 by 600 24 bpp
832 by 624 24 bpp
1024 by 768 24 bpp
Table 3-13 Picture sizes for composite video output
Picture size Pixel depth