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- Q2477934 subject Q8275524.
- Q2477934 subject Q8790867.
- Q2477934 abstract "Half Rate (HR or GSM-HR or GSM 06.20) is a speech coding system for GSM, developed in the early 1990s.Since the codec, operating at 6.5 kbit/s, requires half the bandwidth of the Full Rate codec, network capacity for voice traffic is doubled, at the expense of audio quality. It is recommended to use this codec when the battery is low as it may consume up to 30% less energy. The sampling rate is 8 kHz with resolution 13 bit, frame length 160 samples (20 ms) and subframe length 40 samples (5 ms).GSM Half Rate is specified in ETSI EN 300 969 (GSM 06.20), and uses a form of the VSELP algorithm. Previous specification was in ETSI ETS 300 581-2, which first edition was published in December 1995.For some Nokia phones you can configure the use of this codec: To activate HR codec use enter the following code: *4720# To deactivate HR codec use enter the following code: #4720#↑ ↑".
- Q2477934 wikiPageExternalLink Report_WorkItem.asp?WKI_ID=10142.
- Q2477934 wikiPageExternalLink Report_WorkItem.asp?WKI_ID=6242.
- Q2477934 wikiPageExternalLink 0620.htm.
- Q2477934 wikiPageWikiLink Q1576430.
- Q2477934 wikiPageWikiLink Q184748.
- Q2477934 wikiPageWikiLink Q2532845.
- Q2477934 wikiPageWikiLink Q2847352.
- Q2477934 wikiPageWikiLink Q3270773.
- Q2477934 wikiPageWikiLink Q3511551.
- Q2477934 wikiPageWikiLink Q352455.
- Q2477934 wikiPageWikiLink Q4676210.
- Q2477934 wikiPageWikiLink Q46904.
- Q2477934 wikiPageWikiLink Q7917845.
- Q2477934 wikiPageWikiLink Q8275524.
- Q2477934 wikiPageWikiLink Q8790867.
- Q2477934 wikiPageWikiLink Q899383.
- Q2477934 comment "Half Rate (HR or GSM-HR or GSM 06.20) is a speech coding system for GSM, developed in the early 1990s.Since the codec, operating at 6.5 kbit/s, requires half the bandwidth of the Full Rate codec, network capacity for voice traffic is doubled, at the expense of audio quality. It is recommended to use this codec when the battery is low as it may consume up to 30% less energy.".
- Q2477934 label "Half Rate".