Adaptive Multi-Rate Wideband (AMR-WB).awb audio/amr-wb, audio/3gpp Type of format Audio ITU-T G.722.2 Adaptive Multi-Rate Wideband ( AMR-WB) is a developed based on encoding, using similar methodology as (ACELP). AMR-WB provides improved speech quality due to a wider speech bandwidth of 50–7000 Hz compared to speech coders which in general are optimized for wireline quality of 300–3400 Hz. Was developed by and VoiceAge and it was first specified by 3GPP. AMR-WB is codified as G.722.2, an standard speech codec, formally known as Wideband coding of speech at around 16 kbit/s using Adaptive Multi-Rate Wideband (AMR-WB).
This paper describes the adaptive multirate wideband (AMR-WB) speech codec selected by the Third Generation Partnership Project (3GPP) for GSM and the. Jump to AMR modes - AMR-WB operates, like AMR, with nine different bit rates. The lowest bit rate providing excellent speech quality in a clean environment is 12.65 kbit/s. Quality, especially when compared to narrow-band codecs.
G.722.2 AMR-WB is the same codec as the AMR-WB. The corresponding 3GPP specifications are TS 26.190 for the speech codec and TS 26.194 for the Voice Activity Detector. The AMR-WB format has the following parameters:. Frequency bands processed: 50-6400 Hz (all modes) plus 6400-7000 Hz (23.85 kbit/s mode only). Delay frame size: 20 ms.
Look ahead: 5 ms. AMR-WB codec employs a bandsplitting filter; the one-way delay of this filter is 0.9375 ms. Complexity: 38, RAM 5.3KWords.,. Fixed point: Bit-exact C. Floating point: under work. A common for AMR-WB file format is.awb.
There also exists another storage format for AMR-WB that is suitable for applications with more advanced demands on the storage format, like random access or synchronization with video. This format is the 3GPP-specified based on. 3GP also allows use of AMR-WB bit streams for stereo sound. Contents. AMR modes AMR-WB operates, like, with nine different bit rates.
The lowest bit rate providing excellent speech quality in a clean environment is 12.65 kbit/s. Higher bit rates are useful in background noise conditions and for music. Also, lower bit rates of 6.60 and 8.85 kbit/s provide reasonable quality, especially when compared to narrow-band codecs. The frequencies from 6.4 kHz to 7 kHz are only transmitted in the highest bitrate mode (23.85 kbit/s), while in the rest of the modes the decoder generates sounds by using the lower frequency data (75-6400 Hz) along with random noise (in order to simulate the high frequency band). All modes are sampled at 16 kHz (using 14-bit resolution) and processed at 12.8 kHz. ITU-T (2003) Page i.
Retrieved on 2009-06-17. 3GPP Retrieved on 2009-06-17.
3GPP Retrieved on 2009-06-17. October 13, 2007, at the. Retrieved on 2012-02-22. 3GPP Retrieved on 2014-04-09. Page 35.
Kuo, Sen M., Bob H. Lee, and Wenshun Tian. Real-Time Digital Signal Processing: Fundamentals, Implementations and Applications. John Wiley & Sons, 2013. 3GPP Retrieved on 2014-04-10.
Archived from on 2007-09-29. Retrieved 2006-11-26. CS1 maint: Archived copy as title. Orange to launch mobile HD Voice in 2010. WIND Mobile press release, Feb 3, 2011. T-Mobile Announces AMR-WB (HD Voice) Calls Active on its Network. ETSI (2009-04) Page 58.
Retrieved on 2009-06-02. ETSI (2009-01) Page 11. Retrieved on 2009-06-02.
ETSI (2009-01) Page 10. Retrieved on 2009-06-02.
Industry Canada - ic.gc.ca. Retrieved 2009-09-11. Archived from on 2011-07-23. Retrieved 2009-09-11. VoiceAge Corporation (2009-07-21).
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VoiceAge Corporation. Archived from on 2010-01-28.
Retrieved 2009-09-11. VoiceAge Corporation. VoiceAge Corporation. Retrieved 2009-09-11. External links. RTP Payload Format and File Storage Format for the Adaptive Multi-Rate (AMR) and Adaptive Multi-Rate Wideband (AMR-WB) Audio Codecs. The Codecs Parameter for 'Bucket' Media Types.
Abstract Steganography is a means of covert communication without revealing the occurrence and the real purpose of communication. The adaptive multirate wideband (AMR-WB) is a widely adapted format in mobile handsets and is also the recommended speech codec for VoLTE. In this paper, a novel AMR-WB speech steganography is proposed based on diameter-neighbor codebook partition algorithm. Different embedding capacity may be achieved by adjusting the iterative parameters during codebook division. The experimental results prove that the presented AMR-WB steganography may provide higher and flexible embedding capacity without inducing perceptible distortion compared with the state-of-the-art methods. With 48 iterations of cluster merging, twice the embedding capacity of complementary-neighbor-vertices-based embedding method may be obtained with a decrease of only around 2% in speech quality and much the same undetectability.
Moreover, both the quality of stego speech and the security regarding statistical steganalysis are better than the recent speech steganography based on neighbor-index-division codebook partition.