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Sample Rate (Fs) The number of samples per second, expressed in Hertz (Hz).
Sample Rate Conversion (SRC) A dedicated implementation of the RA process for use on sampled analog data
streams. The error control mechanism is replaced by interpolating techniques. Service A procedure provided by a
System Programming Interface (SPI).
Satellite Phone Phones that connect callers by satellite. Users have a world-wide alternative to terrestrial
connections. Typical use is for isolated users, such as crews of deep-see oil rigs with phones configured to connect
to a satellite service.
SAV Start of active video
SAW Surface Acoustic Wave filter
SDRAM Synchronous Dynamic Random Access Memory.
Service Interval The period between consecutive requests to a USB endpoint to send or receive data.
Service Jitter The deviation of service delivery from its scheduled delivery time.
Service Rate The number of services to a given endpoint per unit time.
SIMD Single Instruction Multiple Data (a parallel processing architecture).
Smart Phone A combination of a mobile phone and a PDA, which allow users to communicate as well as perform
tasks; such as, accessing the Internet and storing contacts in a database. Smart phones have a PDA-like screen.
SMROM Synchronous Mask ROM
SMS Short Messaging Service. A service through which users can send text-based messages from one device to
another. The message can be up to 160 characters and appears on the screen of the receiving device. SMS works
with GSM networks.
SOC System On Chip
SOF See Start-of-Frame.
SOP Start-of-Packet.
SPI See System Programming Interface. Also, "Serial Peripheral Interface protocol.
SPI Serial Peripheral Interface
Split transaction A transaction type supported by host controllers and hubs. This transaction type allows full- and
low-speed devices to be attached to hubs operating at high-speed.
Spread Spectrum An encoding technique patented by actress Hedy Lamarr and composer George Antheil, which
broadcasts a signal over a range of frequencies.
SRAM Static Random Access Memory.
SRC See Sample Rate Conversion.
SSE Streaming SIMD Extensions
Glossary-11
Intel® PXA27x Processor Family Optimization Guide
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