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SPL (sound pressure level) An acoustic measurement of sound energy. 1 dB SPL is the smallest increment in sound level to which the average human is sensitive. Theoretically, 0 dB SPL is the threshold of human hearing while approximately 120 dB is the threshold of pain. Stereo Literally means solid. Usually taken to refer to two channel stereo, though developments in digital audio facilitate multichannel stereo. Streaming A technique for transferring data such that it can be processed as a steady and continuous stream. Streaming technologies are often used on the Internet because many users do not have fast enough access to download large multimedia files quickly, so the client browser or plug-in can star t displaying the data before the entire file has been transmitted. Subwoofer The extra-low frequency drive-unit (loudspeaker) that can be used to augment both stereo and surround system. T Treble High frequencies at the top end of the audio band i.e. above 3kHz. 32 EN Tweeter The drive unit (loudspeaker) that reproduces high frequency sounds. U UPnP (Universal Plug and Play) Universal Plug and Play is a networking architecture developed by a consor tium of companies to ensure easy connectivity between products from different vendors. UPnP devices should be able to connect to a network automatically, handling identification and other processes on the fly.The standards developed by the UPnP Forum are media-, platform-, and device-independent. USB (universal serial bus) A hardware interface used to connect devices such as computer audio players, digital cameras, and more. USB is UPnP enabled (also called hot-swappable), meaning that a computer does not need to be turned off when new devices are plugged in and the devices do not need to be configured. USB suppor ts data transfer rates of up to 60MB per second (in USB 2.0). V VBR (variable bit rate) With VBR, the encoder takes as much bits as it needs. So black pictures get few bits and complex pictures get as much as they need. While this provides the best quality the final size cannot be predicted at all. Volume Volume is the most common word used to specify the control of relative loudness of sounds. It also per tains to the function on many electronic devices that is used to control the loudness. W W (wattage) A measurement of power. In speakers, wattage is a term that indicates power-handling characteristics in dealing with electrical voltage inputs from the amplifier. WAP (Wireless Application Protocol) Global protocol used in some wireless devices that allows the user to view and interact with data ser vices. Generally used as a means to view Internet web pages using the limited transmission capacity and small display screens of por table wireless devices. WAV A format for sound files developed jointly by Microsoft and IBM. Built into Windows 95 to XP, which made it the de facto standard for sound on PCs. WAV sound files end with a ‘.wav’ extension and works with nearly all Windows applications that suppor t sound. WEP (Wired Equivalent Privacy) All 802.11b (Wi-Fi / wireless) networks use WEP as their basic security protocol. WEP secures data transmissions using 64-bit or 128-bit encr yption; however, it does not offer complete security and is usually used in conjunction with other security measures such as EAP. Wi-Fi Wi-Fi (Wireless Fidelity) is a wireless technology brand owned by the Wi-Fi Alliance intended to improve the interoperability of wireless local area network products based on the IEEE 802.11 standards. Common applications for Wi-Fi include Internet and VoIP phone access, gaming, and network connectivity for consumer electronics such as televisions, DVD players, and digital cameras. Wireless Telecommunications using electromagnetic waves rather than wires or cable to transmit information. Wireless communication can be used for free-ranging mobile systems such as cell phones and global positioning systems (GPS), which use satellite technology. Wireless systems can also be fixed, such as LANs that provide wireless communications within a limited area (such as an office), or wireless peripherals such as mice and keyboards. WMA (Windows Media Audio) An audio format owned by Microsoft, is a par t of Microsoft Windows Media technology. Includes Microsoft Digital Rights Management tools, Windows Media Video encoding technology, and Windows Media Audio encoding technology. Woofer The drive unit (loudspeaker) that reproduces the bass (low) frequencies. WPA / WPA2 (Wi-Fi Protected Access) A Wi-Fi standard that was designed to improve upon the security features of WEP. The technology is designed to work with existing Wi-Fi products that have been enabled with WEP (i.e. as a software upgrade to existing hardware), but the technology includes two improvements over WEP. Glossary E n g l i s h EN 33 Contact information Canada (Francophone) 1-800-661-6162 United States and Canada (English and Spanish speaking) 1-888-744-5477 Argentina (54-11) 4544-2047 Austr...