Selectable Mode Vocoder
Selectable Mode Vocoder (SMV) is speech coding standard used in
CDMA2000 networks. SMV provides multiple modes of operation that are selected based on input speech characteristics.The SMV for
Wideband CDMA is based on 4 codecs: full rate at 8.5 kbit/s, half rate at 4 kbit/s, quarter rate at 2 kbit/s, and eighth rate at 800 bit/s. The full rate and half rate are based on the eXtended
CELP (eX-CELP)
algorithm that is based on a combined closed-loop-open-loop-analysis (COLA). In eX-CELP the signal frames are first classified as:Silence/Background noiseNon-stationary unvoicedStationary unvoicedOnsetNon-stationary voicedStationary voiced
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SMV
SMV
SMV
SMV son las siglas de Selectable Mode Vocoder. Constituyen una de las versiones de codificadores de voz en radiotelefonía.
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Sörby Mekaniska Verkstad