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Speech Codec Comparison Quiz

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Questions and Answers

Which codec was selected as the mandatory default 3G speech codec by TSG-SA?

MPEG-4 speech codec

ITU G.729

GSM AMR (correct)

IS127 EVRC

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. (correct)

It provided the highest data rates.

It was developed by ARIB specifically for this project.

It was the only codec available at that time.

Which codec was found to exceed the performance requirements set by ARIB for the Mandatory Speech codec?

IS127 EVRC

MPEG-4 speech codec

GSM EFR (correct)

ITU G.729

What was one of the advantages of GSM AMR over the other candidate codecs?

Offering a toll quality speech service without compromising system capacity Signup and view all the answers

In addition to GSM EFR, which other codec modes were part of GSM AMR's selection?

IS136 EFR Signup and view all the answers

When was the codec selection process completed according to the text?

April 99 Signup and view all the answers

What was the maximum theoretical peak rate for UTRAN Release'99?

2 Mbits/s Signup and view all the answers

Which code division multiple access scheme was chosen for UTRAN?

Direct-Sequence Code Division Multiple Access Signup and view all the answers

What is the chip rate used in UTRAN?

3.84 Mcps Signup and view all the answers

What is the 'Carrier spacing' in UTRAN?

5 MHz Signup and view all the answers

How many source rates could the speech codec in UTRAN use?

Up to eight source rates Signup and view all the answers

Why was the occupied bandwidth in UTRAN set to less than 5 MHz?

To benefit from the multipath nature of radio propagation Signup and view all the answers

What is the purpose of the 'Mandatory Speech Codec for Narrowband Telephony Service' feature?

To define the default speech codec for UMTS Signup and view all the answers

What protocols are involved in the 'Mandatory Speech Codec for Narrowband Telephony Service' feature?

TS 26.071, TS 26.103, TR 26.975 Signup and view all the answers

Which aspect of UTRAN design is addressed by the 'Mandatory Speech Codec for Narrowband Telephony Service'?

Link Adaptation Signup and view all the answers

What is the purpose of AMR in the context of speech coding in UTRAN?

Voice Activity Detection Signup and view all the answers

Which document contains references to the 'Mandatory Speech Codec for Narrowband Telephony Service'?

SA4_Work_Items_History SP-99060 Signup and view all the answers

What does PLMN stand for in the context of UTRAN design?

Public Land Mobile Network Signup and view all the answers