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Wideband AMR HD Voice

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Dr. Ayman Elnashar, PhD
Dr. Ayman Elnashar, PhD

Wideband-AMR validation and testing was conducted over 3G networks. Wideband audio from 50-7000 Hz provides improved speech quality, naturalness, and intelligibility compared to narrowband audio from 200-3400 Hz. The test involved comparing wideband and narrowband audio streams for various audio clips and analyzing frequency responses. Results showed wideband captured higher frequencies and had better adaptive noise cancellation and audio quality. Testing also validated seamless switching between wideband and narrowband during 3G to 2G handovers.

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Wideband-AMR Validation and Testing over 3G Network Dr. Ayman Elnashar Sr. Director - Wireless Broadband & Site Sharing Ayman.elnashar@du.ae Dr. Mahmoud Sherif Director – Wireless Broadband Kassem Abdulla Sr. Manger – Wireless Broadband Thanks for the support of the Wireless Broadband Team
Background Information Bandwidth of sound signals: - Regular telephone bandwidth (Narrowband) = 200-3400 Hz - Wideband (wider bandwidth) = 50-7000 Hz Why Wideband: - Results in major subjective improvements in speech quality - Compared to narrowband telephone speech, the low-frequency enhancement from 50 to 200 Hz contributes to increased naturalness, presence, and comfort. - The high-frequency extension from 3400 to 7000 Hz provides better fricative differentiation and therefore higher intelligibility. - A bandwidth of 50 to 7000 Hz not only improves the intelligibility and naturalness of speech, but also adds a feeling of transparent communication and facilitates speaker recognition. Source  VoiceAge WHITE PAPER 2
Wideband-AMR Technical Specification: 3GPP TS 26.171 V7.0.0 (2006-09) The AMR-WB speech coder consists of the multi-rate speech coder, a source controlled rate scheme including a voice activity detector and a comfort noise generation system, and an error concealment mechanism to combat the effects of transmission errors and lost packets. The multi-rate speech coder is a single integrated speech codec with nine source rates from 6.60 kbit/s to 23.85 kbit/s, and a low rate background noise encoding mode. The speech coder is capable of switching its bit-rate every 20 ms speech frame upon command. Codec mode Source codec bit-rate - AMR-WB_23.85 23.85 kbit/s - AMR-WB_23.05 23.05 kbit/s - AMR-WB_19.85 19.85 kbit/s - AMR-WB_18.25 18.25 kbit/s - AMR-WB_15.85 15.85 kbit/s - AMR-WB_14.25 14.25 kbit/s - AMR-WB_12.65 12.65 kbit/s - AMR-WB_8.85 8.85 kbit/s - AMR-WB_6.60 6.60 kbit/s 3
Speech Quality Comparison Speech quality of AMR-WB in the GSM FR channel compared to AMR-NB and EFR Source  VoiceAge WHITE PAPER 4
Sample Handset With WB-AMR Support Supported Handsets Vendor Current Nokia N8 Sony Ericsson Elm, Hazel, Cedar Samsung SIII, Galaxy Note 2 Apple IPhone 5  It has to be noted that, some of existing Symbian phones like E72 support WB-AMR but was not enabled by Nokia. Therefore, to activate WB-AMR in these phones a firmware upgrade is needed.  It is to be noted that some handset manufactures turn off the WB-AMR feature and they only enable it upon operator request. 5
3GPP Schematic diagram for WB-AMR (TX) 6
Wideband Versus Narrowband: A Comparative Analysis based on live network results 7
Test-bed: Test Setup Node-B/RNC/MGW RX Station TX Station Audio output Streams Audio Input Streams WB-UE Nokia N8 WB-UE Adobe Audition Recorder Nokia E72 MP3 Source Files with WB frequencies Adobe Audition Ver 3. Post Processing & Verification Tools Suit 8
Audio Source for Testing Source Audio (Test Audio) has been very carefully chosen based on the “Test Vectors Associated to Rec. ITU-T G.722.2 Annex D” and consists of the following: Phonetically Phonetically High-to-Low Low-to-High MP3 HiFi Balanced Speech Balanced Speech Frequency Frequency Song with Background without Scan Scan (0-17KHz) Noise (Rain) Background Noise (50-7000Hz) (50-7000Hz) 9
Wideband versus Narrowband Real-Time Streams High Frequency Cutoff with NB High Frequency Pass with WB Narrow Band output Wide Band output 10
WideBand & NarrowBand-Frequency Analysis Narrow-Band Cut-off Frequency Wide-Band Cut-off Frequency 11
WB versus NB Real-Time Series: Phonetically Balanced Speech with Noise Background(Rain): Time-Series NB Output NB_Rain_MP3.mp3 WB Output Much better Adaptive Noise Cancellation Algorithm 12
WB versus NB Frequency Analysis: Speech with Noise Background (Noise) Narrow-Band Cut-off Frequency : Narrower Filter Wide-Band Cut-off Frequency: Wider Filter 13
WB Versus NB Real-Time Series: Phonetically Balanced Speech without Background Noise, but with Female Sound. 14
WB Versus NB Frequency Analysis: Phonetically Balanced Speech without Background Noise, but with Female Sound. Narrow-Band Cut-off Frequency Wide-Band Cut-off Frequency 15
WB Versus NB Real Time Series: Low-to-High Frequency Scan Narrow-Band Output Wide-Band Output 16
WB Versus NB –Frequency Analysis: Low-to-High Frequency Scan Narrow-Band Cut-off Frequency Wide-Band Cut-off Frequency 17
WB Versus NB –Real Time Series: MP3 Music Narrow Band Output Wide-Band Output 18
WB Versus NB –Frequency Analysis: MP3 Music Narrow-Band Cut-off Frequency Wide-Band Cut-off Frequency 19
WideBand to NarrowBand Switching during 3G to 2G call Handover test-case 3G to 2G Handover 3G 2G Handover Mute < 200ms Requirement Wide-Band Narrow-Band 156 millisecond 20
WideBand (on 3G) Frequency Analysis (Before 2G Handover) 21
NarrowBand -Frequency Analysis (After 2G Handover) 22
Thank You 23

More Related Content

Wideband AMR HD Voice

  • 1. Wideband-AMR Validation and Testing over 3G Network Dr. Ayman Elnashar Sr. Director - Wireless Broadband & Site Sharing Ayman.elnashar@du.ae Dr. Mahmoud Sherif Director – Wireless Broadband Kassem Abdulla Sr. Manger – Wireless Broadband Thanks for the support of the Wireless Broadband Team
  • 2. Background Information Bandwidth of sound signals: - Regular telephone bandwidth (Narrowband) = 200-3400 Hz - Wideband (wider bandwidth) = 50-7000 Hz Why Wideband: - Results in major subjective improvements in speech quality - Compared to narrowband telephone speech, the low-frequency enhancement from 50 to 200 Hz contributes to increased naturalness, presence, and comfort. - The high-frequency extension from 3400 to 7000 Hz provides better fricative differentiation and therefore higher intelligibility. - A bandwidth of 50 to 7000 Hz not only improves the intelligibility and naturalness of speech, but also adds a feeling of transparent communication and facilitates speaker recognition. Source  VoiceAge WHITE PAPER 2
  • 3. Wideband-AMR Technical Specification: 3GPP TS 26.171 V7.0.0 (2006-09) The AMR-WB speech coder consists of the multi-rate speech coder, a source controlled rate scheme including a voice activity detector and a comfort noise generation system, and an error concealment mechanism to combat the effects of transmission errors and lost packets. The multi-rate speech coder is a single integrated speech codec with nine source rates from 6.60 kbit/s to 23.85 kbit/s, and a low rate background noise encoding mode. The speech coder is capable of switching its bit-rate every 20 ms speech frame upon command. Codec mode Source codec bit-rate - AMR-WB_23.85 23.85 kbit/s - AMR-WB_23.05 23.05 kbit/s - AMR-WB_19.85 19.85 kbit/s - AMR-WB_18.25 18.25 kbit/s - AMR-WB_15.85 15.85 kbit/s - AMR-WB_14.25 14.25 kbit/s - AMR-WB_12.65 12.65 kbit/s - AMR-WB_8.85 8.85 kbit/s - AMR-WB_6.60 6.60 kbit/s 3
  • 4. Speech Quality Comparison Speech quality of AMR-WB in the GSM FR channel compared to AMR-NB and EFR Source  VoiceAge WHITE PAPER 4
  • 5. Sample Handset With WB-AMR Support Supported Handsets Vendor Current Nokia N8 Sony Ericsson Elm, Hazel, Cedar Samsung SIII, Galaxy Note 2 Apple IPhone 5  It has to be noted that, some of existing Symbian phones like E72 support WB-AMR but was not enabled by Nokia. Therefore, to activate WB-AMR in these phones a firmware upgrade is needed.  It is to be noted that some handset manufactures turn off the WB-AMR feature and they only enable it upon operator request. 5
  • 6. 3GPP Schematic diagram for WB-AMR (TX) 6
  • 7. Wideband Versus Narrowband: A Comparative Analysis based on live network results 7
  • 8. Test-bed: Test Setup Node-B/RNC/MGW RX Station TX Station Audio output Streams Audio Input Streams WB-UE Nokia N8 WB-UE Adobe Audition Recorder Nokia E72 MP3 Source Files with WB frequencies Adobe Audition Ver 3. Post Processing & Verification Tools Suit 8
  • 9. Audio Source for Testing Source Audio (Test Audio) has been very carefully chosen based on the “Test Vectors Associated to Rec. ITU-T G.722.2 Annex D” and consists of the following: Phonetically Phonetically High-to-Low Low-to-High MP3 HiFi Balanced Speech Balanced Speech Frequency Frequency Song with Background without Scan Scan (0-17KHz) Noise (Rain) Background Noise (50-7000Hz) (50-7000Hz) 9
  • 10. Wideband versus Narrowband Real-Time Streams High Frequency Cutoff with NB High Frequency Pass with WB Narrow Band output Wide Band output 10
  • 11. WideBand & NarrowBand-Frequency Analysis Narrow-Band Cut-off Frequency Wide-Band Cut-off Frequency 11
  • 12. WB versus NB Real-Time Series: Phonetically Balanced Speech with Noise Background(Rain): Time-Series NB Output NB_Rain_MP3.mp3 WB Output Much better Adaptive Noise Cancellation Algorithm 12
  • 13. WB versus NB Frequency Analysis: Speech with Noise Background (Noise) Narrow-Band Cut-off Frequency : Narrower Filter Wide-Band Cut-off Frequency: Wider Filter 13
  • 14. WB Versus NB Real-Time Series: Phonetically Balanced Speech without Background Noise, but with Female Sound. 14
  • 15. WB Versus NB Frequency Analysis: Phonetically Balanced Speech without Background Noise, but with Female Sound. Narrow-Band Cut-off Frequency Wide-Band Cut-off Frequency 15
  • 16. WB Versus NB Real Time Series: Low-to-High Frequency Scan Narrow-Band Output Wide-Band Output 16
  • 17. WB Versus NB –Frequency Analysis: Low-to-High Frequency Scan Narrow-Band Cut-off Frequency Wide-Band Cut-off Frequency 17
  • 18. WB Versus NB –Real Time Series: MP3 Music Narrow Band Output Wide-Band Output 18
  • 19. WB Versus NB –Frequency Analysis: MP3 Music Narrow-Band Cut-off Frequency Wide-Band Cut-off Frequency 19
  • 20. WideBand to NarrowBand Switching during 3G to 2G call Handover test-case 3G to 2G Handover 3G 2G Handover Mute < 200ms Requirement Wide-Band Narrow-Band 156 millisecond 20
  • 21. WideBand (on 3G) Frequency Analysis (Before 2G Handover) 21
  • 22. NarrowBand -Frequency Analysis (After 2G Handover) 22
  • 23. Thank You 23