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- Selectable_Mode_Vocoder abstract "Selectable Mode Vocoder (SMV) is variable bitrate 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 CELP algorithm that is based on a combined closed-loop-open-loop-analysis (COLA). In SMV the signal frames are first classified as: Silence/Background noise Non-stationary unvoiced Stationary unvoiced Onset Non-stationary voiced Stationary voicedThe algorithm includes voice activity detection (VAD) followed by an elaborate frame classification scheme. Silence/background noise and stationary unvoiced frames are represented by spectrum-modulated noise and coded at 1/4 or 1/8 rate. The SMV uses 4 subframes for full rate and two/three subframes for half rate. The stochastic (fixed) codebook structure is also elaborate and uses sub-codebooks each tuned for a particular type of speech. The sub-codebooks have different degrees of pulse sparseness (more sparse for noise like excitation). SMV scores a high of 3.6 MOS at full rate with clean speech.The coder works on a frame of 160 speech samples (20 ms) and requires a look ahead of 80 samples (10 ms) if noise-suppression option B is used. An additional 24 samples of look ahead is required if noise-suppression option A is used. So the algorithmic delay for the coder is 30 ms with noise-suppression option B and 33 ms with noise-suppression option A.The next evolution of CDMA speech codecs is VMR-WB which provides much higher speech quality with wideband while fitting to the same networks.SMV can be also used in 3GPP2 container file format - 3G2.".
- Selectable_Mode_Vocoder wikiPageID "1188603".
- Selectable_Mode_Vocoder wikiPageRevisionID "542500488".
- Selectable_Mode_Vocoder hasPhotoCollection Selectable_Mode_Vocoder.
- Selectable_Mode_Vocoder subject Category:3rd_Generation_Partnership_Project_2_standards.
- Selectable_Mode_Vocoder subject Category:Code_division_multiple_access.
- Selectable_Mode_Vocoder subject Category:Mobile_telecommunications_standards.
- Selectable_Mode_Vocoder subject Category:Speech_codecs.
- Selectable_Mode_Vocoder type 3rdGenerationPartnershipProject2Standards.
- Selectable_Mode_Vocoder type Abstraction100002137.
- Selectable_Mode_Vocoder type Measure100033615.
- Selectable_Mode_Vocoder type MobileTelecommunicationsStandards.
- Selectable_Mode_Vocoder type Standard107260623.
- Selectable_Mode_Vocoder type SystemOfMeasurement113577171.
- Selectable_Mode_Vocoder comment "Selectable Mode Vocoder (SMV) is variable bitrate 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 CELP algorithm that is based on a combined closed-loop-open-loop-analysis (COLA).".
- Selectable_Mode_Vocoder label "SMV".
- Selectable_Mode_Vocoder label "Selectable Mode Vocoder".
- Selectable_Mode_Vocoder label "Selectable mode vocoder".
- Selectable_Mode_Vocoder sameAs Selectable_mode_vocoder.
- Selectable_Mode_Vocoder sameAs SMV.
- Selectable_Mode_Vocoder sameAs m.04fr9t.
- Selectable_Mode_Vocoder sameAs Q3509084.
- Selectable_Mode_Vocoder sameAs Q3509084.
- Selectable_Mode_Vocoder sameAs Selectable_Mode_Vocoder.
- Selectable_Mode_Vocoder wasDerivedFrom Selectable_Mode_Vocoder?oldid=542500488.
- Selectable_Mode_Vocoder isPrimaryTopicOf Selectable_Mode_Vocoder.