Cannabaceae

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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 5.6 kbit/s, requires half the bandwidth of the Full Rate codec, network capacity for voice traffic is doubled, at the expense of audio quality. 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.[1] Previous specification was in ETSI ETS 300 581–2, which first edition was published in December 1995.[2]

For some Nokia phones one 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#

See also[edit]

References[edit]

  1. ^ ETSI, EN 300 969 - Half rate speech transcoding (GSM 06.20 version 8.0.1 Release 1999), Retrieved on 2009-07-11
  2. ^ ETSI ETS 300 581-2 - Half rate speech transcoding (GSM 06.20 version 4.3.1), Retrieved on 2009-07-11

External links[edit]


source: https://en.wikipedia.org/wiki/Half_Rate

One thought on “Cannabaceae”

  1. Well, that’s interesting to know that Psilotum nudum are known as whisk ferns. Psilotum nudum is the commoner species of the two. While the P. flaccidum is a rare species and is found in the tropical islands. Both the species are usually epiphytic in habit and grow upon tree ferns. These species may also be terrestrial and grow in humus or in the crevices of the rocks.
    View the detailed Guide of Psilotum nudum: Detailed Study Of Psilotum Nudum (Whisk Fern), Classification, Anatomy, Reproduction

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