18 Questions
Which codec was selected as the mandatory default 3G speech codec by TSG-SA?
GSM AMR
What was a key reason for selecting the GSM AMR as the 3G speech codec?
It offered multiple codec modes for flexibility in service quality.
Which codec was found to exceed the performance requirements set by ARIB for the Mandatory Speech codec?
GSM EFR
What was one of the advantages of GSM AMR over the other candidate codecs?
Offering a toll quality speech service without compromising system capacity
In addition to GSM EFR, which other codec modes were part of GSM AMR's selection?
IS136 EFR
When was the codec selection process completed according to the text?
April 99
What was the maximum theoretical peak rate for UTRAN Release'99?
2 Mbits/s
Which code division multiple access scheme was chosen for UTRAN?
Direct-Sequence Code Division Multiple Access
What is the chip rate used in UTRAN?
3.84 Mcps
What is the 'Carrier spacing' in UTRAN?
5 MHz
How many source rates could the speech codec in UTRAN use?
Up to eight source rates
Why was the occupied bandwidth in UTRAN set to less than 5 MHz?
To benefit from the multipath nature of radio propagation
What is the purpose of the 'Mandatory Speech Codec for Narrowband Telephony Service' feature?
To define the default speech codec for UMTS
What protocols are involved in the 'Mandatory Speech Codec for Narrowband Telephony Service' feature?
TS 26.071, TS 26.103, TR 26.975
Which aspect of UTRAN design is addressed by the 'Mandatory Speech Codec for Narrowband Telephony Service'?
Link Adaptation
What is the purpose of AMR in the context of speech coding in UTRAN?
Voice Activity Detection
Which document contains references to the 'Mandatory Speech Codec for Narrowband Telephony Service'?
SA4_Work_Items_History SP-99060
What does PLMN stand for in the context of UTRAN design?
Public Land Mobile Network
Test your knowledge on the performance comparison of GSM AMR, IS127 EVRC, ITU G.729, and MPEG-4 speech codecs under various conditions and error patterns. Learn about subjective tests conducted with and without background noise, channel errors, tandeming, and music on hold.
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