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ITU and 3GPP Standard Speech Codec
G.729/A/B,
G.723.1/A, GSM AMR, Wideband AMR.
Fully compliant with ITU and 3GPP standard and specification(listed
below), test data and reference codec.
(1) ITU-T Recommendation G.729, Coding of Speech at 8 kbit/s Using
Conjugate-Structure Algebraic-Code-Excited Linear-Prediction (CS-ACELP).
(2) G729 Annex A, Reduced complexity 8 kbit/s CS-ACELP speech codec
(3) G729 Annex B, A silence compression scheme for G.729 terminals
(4) ITU-T Recommendation G.723.1, Dual rate speech coder for multimedia
communications transmitting at 5.3 and 6.3 kbit/s.
(5) G.723.1 AnnexA, silence compression scheme.
(6) GSM 06.90, Digital cellular telecommunication system (Phase
2+); Adaptive Multi-Rate (AMR) speech transcoding.
(7) GSM 06.91, Substitution and muting of lost frame for AMR speech
traffic channels.
(8) GSM 06.92, Comfort noise aspects for AMR speech traffic channels.
(9) GSM 06.93, Discontinuous transmission (DTX) for AMR speech traffic
channels.
(10) GSM 06.94, Voice Activity Detector (VAD) for AMR.
(11) GSM 06.74, Test sequences for the AMR speech codec.
(12) 3GPP TS26.190, AMR Wideband speech codec; Transcoding functions(Release
5).
(13) 3GPP TS 26.194, Voice Activity Detection (VAD).
(14) 3GPP TS 26.174, AMR wideband speech codec; Test sequences.
(15) 3GPP TS 26.194, Frame Structure.
Advantage
(1)
Lower your developing risk and boost your product TTM.
(2) Well optimized for saving CPU usage and enhancing your system
performance.
Release
Supporting
TI TMS320 C54, ARM and Intel PXA platform.
C54 include C5402, C5409, C5410 and C5416.
ARM include ARM7 and ARM9.
PXA include PXA255, PXA260 and PXA270.
Supporting WinCE and Linux OS. EVC, GCC and ADS compiler.
For
details of the performance of the above audio encoders and decoders,
please Contact Us, demos are on requirement.
1280bps
Low Bit Rate Speech Coding
Encode speech at 1280bps, Realtime compression, much lower than
G.723.1 5.3kbps and GSM AMR 4.75kbps, good synthesized speech quality.
Advantage
Save bandwidth and memory in the situation of limited resource,
or unstable network, while still retain satisfying speech communication
quality.
Release
Supporting TI TMS320 C54, ARM and Intel PXA platform.
MP3
Decoder
Fully compliant with ISO/IEC 11172-3, 13818-3, multi
channel, sampling rate 16-48kHz, bit rate 8kbps-1.5Mbps.
Supporting
TI TMS320 C54, ARM and Intel PXA platform.
AAC
Encoder/Decoder
Fully compliant with ISO/IEC 13818-7, 14496-3, supports
LC(Low Complexity), LD(Low Delay), PNS(Perceptual Noise Shaping)
and LTP(Long Term Prediction). multi channel, sampling rate 8-96kHz,
bit rate 16-576kbps.
Supporting
TI TMS320 C54, ARM, Freescale iMX27 and Intel PXA platform.
MIDI
Encoder/Decoder
To be implemented. Simple demo on requirement.
Noise
Deduction
Low Delay (10ms), Low complexity, easily ported for all platforms.
Type1, Output SNR gain 10dB when input SNR>10dB, little
influnce on speech quality.
Type2, Output SNR 20dB when input SNR>5dB, a little influnce
on speech quality.
Advantage
DSP frequancy domain filter, well suppression of high background
noise, keep speech quality.
Release
Supporting TI TMS320 C54, ARM and Intel PXA platform.
Adaptive
Echo Cancel (AEC)
Type1, Adaptively Cancel the acoustic echo of handheld device and
meeting room from speaker to microphone.
Type2, Adaptively Cancel the hybrid echo in PSTN.
Supporting TI TMS320 C54, ARM and Intel PXA platform.
DTMF
Signal Generation and Detection
To be implemented. Simple demo on requirement.
Speech
Recognition
To
be implemented. Simple demo on requirement.
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