Timbre - The "voice" or basic tonal quality of a speaker. To avoid distractions and achieve realism in a home theatre system, each of the system's speakers should have an identical, or at least similar, timbre.
Decibel (dB), loudness - A numeric expression of the relative loudness of a sound. The minimum change in sound intensity that a human ear can distinguish is approximately 3 dB.
Set-top Converter Box - This unit sits on top of the viewer's analog TV, receives the Digital TV signal, converts it to an analog signal, and then sends that signal on to the analog TV.
AACS - Advanced Access Control System. A computer specification for guarding next-generation optical-media content created by the film, electronics, and software industries.
Simple Remote - Additional simplified remote supplied with select models that is designed for use with Hitachi's Learning AV NET Home Theater Control System. The easy to use, ergonomically designed simple remote contains only twelve of the most used buttons for most Home Theater operations.
Artefacts - Unwanted visible effects in the picture created by errors in the video processing or noise/interference in analog circuits. Common artefacts include 'edge crawl' or 'hanging dots' in analog pictures or 'blockiness', noise or 'contouring' in digital pictures.
IMEI - International Mobile Equipment Identity: a unique number given to every mobile phone and usually found behind the battery. When a phone is reported stolen, the number is marked invalid.
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