Variable-Rate Multimode Wideband (original) (raw)
VMR-WB（variable-rate multimode wideband）はマルチレートの広帯域音声符号化方式で、CDMA2000 方式の第三世代携帯電話で利用される。また GSM や W-CDMA で利用される広帯域音声符号化方式の AMR-WB と相互運用性のあるモードを持つ。 また、ITU-T が勧告した広帯域音声符号化方式 G.718 のコアコーデックのベースとしても利用されている。
| Property | Value |
|---|---|
| dbo:abstract | Variable-Rate Multimode Wideband (VMR-WB) is a source-controlled variable-rate multimode codec designed for robust encoding/decoding of wideband/narrowband speech. The operation of VMR-WB is controlled by speech signal characteristics (i.e., source-controlled) and by traffic condition of the network (i.e., network-controlled mode switching). Depending on the traffic conditions and the desired quality of service (QoS), one of the 4 operational modes is used. All operating modes of the existing VMR-WB standard are fully compliant with cdma2000 rate-set II. VMR-WB modes 0, 1, and 2 are cdma2000 native modes with mode 0 providing the highest quality and mode 2 the lowest ADR. VMR-WB mode 3 is the AMR-WB interoperable mode operating at an ADR slightly higher than mode 0 and providing a quality equal or better than that of AMR-WB at 12.65 kbit/s when in an interoperable interconnection with AMR-WB at 12.65 kbit/s. Now also a cdma2000 rate-set I compliant mode is implemented to the coder as mode 4. The average bitrate of the mode is 6.1 kbit/s (maximum is 8.55 kbit/s). Source coding bitrates are: Rate-Set I - 8.55, 4.0, 2.0, 0.8 kbit/s, Rate-Set II - 13.3, 6.2, 2.7, 1.0 kbit/s. VMR-WB uses 16 kHz sampling frequency. Algorithmic delay is 33.75ms. VMR-WB can be also used in 3GPP2 container file format - 3G2. VMR-WB was designed by Nokia and VoiceAge. It is based on AMR-WB. (en) VMR-WB（variable-rate multimode wideband）はマルチレートの広帯域音声符号化方式で、CDMA2000 方式の第三世代携帯電話で利用される。また GSM や W-CDMA で利用される広帯域音声符号化方式の AMR-WB と相互運用性のあるモードを持つ。 また、ITU-T が勧告した広帯域音声符号化方式 G.718 のコアコーデックのベースとしても利用されている。 (ja) |
| dbo:wikiPageExternalLink | https://web.archive.org/web/20041102200753/http:/www.3gpp2.org/Public_html/Specs/C.S0052-0_v1.0_040617.pdf https://web.archive.org/web/20080419094934/http:/www.voiceage.com/vmrwb.php http://www.3gpp2.org/public_html/specs/tsgc.cfm http://www.voiceage.com/vmrwb.php |
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| dbp:containedby | 3 (xsd:integer) |
| dbp:extendedfrom | AMR-WB/G.722.2 (en) |
| dbp:mime | audio/VMR-WB (en) |
| dbp:name | Variable-Rate Multimode Wideband (en) |
| dbp:owner | 3 (xsd:integer) |
| dbp:type | dbr:Audio_file_format dbr:Lossy_compression |
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| dct:subject | dbc:Speech_codecs |
| gold:hypernym | dbr:Codec |
| rdf:type | dbo:Software yago:Abstraction100002137 yago:Communication100033020 yago:Format106636806 yago:Information106634376 yago:Message106598915 |
| rdfs:comment | VMR-WB（variable-rate multimode wideband）はマルチレートの広帯域音声符号化方式で、CDMA2000 方式の第三世代携帯電話で利用される。また GSM や W-CDMA で利用される広帯域音声符号化方式の AMR-WB と相互運用性のあるモードを持つ。 また、ITU-T が勧告した広帯域音声符号化方式 G.718 のコアコーデックのベースとしても利用されている。 (ja) Variable-Rate Multimode Wideband (VMR-WB) is a source-controlled variable-rate multimode codec designed for robust encoding/decoding of wideband/narrowband speech. The operation of VMR-WB is controlled by speech signal characteristics (i.e., source-controlled) and by traffic condition of the network (i.e., network-controlled mode switching). Depending on the traffic conditions and the desired quality of service (QoS), one of the 4 operational modes is used. All operating modes of the existing VMR-WB standard are fully compliant with cdma2000 rate-set II. VMR-WB modes 0, 1, and 2 are cdma2000 native modes with mode 0 providing the highest quality and mode 2 the lowest ADR. VMR-WB mode 3 is the AMR-WB interoperable mode operating at an ADR slightly higher than mode 0 and providing a quality (en) |
| rdfs:label | VMR-WB (ja) Variable-Rate Multimode Wideband (en) |
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