Voice Compression Algorithms
Optimized Off-the-Shelf speech compression algorithms (codecs) for Traditional and IP Telephony Systems.
ADAPTIVE DIGITAL TECHNOLOGIES, INC., IS THE LEADING PROVIDER OF VOICE ALGORITHMS AND SOLUTIONS ON THE TEXAS INSTRUMENTS (TI) TMS320™ FAMILY OF DSPS, OMAP. ARM ARCHITECTURE INCLUDING ARM®V7 (Cortex-A, Cortex-M) ARM®V8 (Cortex-A, Cortex-R5) DEVICES. LINUX x86 (32-bit) AND x64, AND WINDOWS 32-Bit, and 64-Bit.
ITU Telecommunication Standardization Sector
G. 7xx Series Speech and Audio Coding Algorithms
G.711: Pulse code modulation (PCM) of voice frequencies
G.711.1: Wideband embedded extension for ITU-T G.711 pulse code modulation
G.722: 7 kHz audio-coding within 64 kbit/s
G.722.1: Low-complexity coding at 24 and 32 kbit/s for hands-free operation in systems with low frame loss
G.722.2: Wideband coding of speech at around 16 kbit/s using Adaptive Multi-Rate Wideband (AMR-WB)
G.723.1: Dual rate speech coder for multimedia communications transmitting at 5.3 and 6.3 kbit/s
G.726: 40, 32, 24, 16 kbit/s Adaptive Differential Pulse Code Modulation (ADPCM)
G.728: Coding of speech at 16 kbit/s using low-delay code excited linear prediction
G.729: Coding of speech at 8 kbit/s using conjugate-structure algebraic-code-excited linear prediction (CS-ACELP)
ITU-T G.729 and its Annexes and Appendices offer different functionalities in terms of various bit rates and/or DTX operations using either fixed point or floating point arithmetic. The table below ⇓ summarizes these functionalities.
G.729 and its Annexes and Appendices
| Functionality | G.729 | A | B | D | E | F | G | H | I |
| Low Complexity | X | X | |||||||
| Fixed-Point | X | X | X | ||||||
| 8 kbit/s | X | X | X | X | X | X | X | X | X |
| 6.4 kbit/s | X | X | X | X | X | ||||
| 11.8 kbit/s | X | X | X | X | X | ||||
| DTX | X | X | X | X | X |
GSM Speech and Audio Coding Standards for Mobile Communications
GSM-AMR: Bit rates ranging from 4.75 to 12.2 kbit/s with toll quality speech starting at 7.4 kbit/s
GSM-AMR WB: Provides improved speech quality due to a wider speech bandwidth of 50–7000 Hz.
GSM-FR: Bit rate of the codec is 13 kbit/s, or 1.625 bits/audio sample.
Wideband Speech Codecs
G.722: 7 kHz audio-coding within 64 kbit/s
G.722.1: Low-complexity coding at 24 and 32 kbit/s for hands-free operation in systems with low frame loss
G.722.2: Wideband coding of speech at around 16 kbit/s using Adaptive Multi-Rate Wideband (AMR-WB)
Speex: Wide range of bit rates available (from 2 kbit/s to 44 kbit/s). Ultra-wideband mode at 32 kHz (up to 48 kHz).
Other Speech and Audio Coding Standards
iLBC: iLBC handles lost frames through graceful speech quality degradation.
MELPe: For use in many applications including secure radio devices, satellite communications, VoIP, and cellphone applications.
Opus: Opus supports constant and variable bitrate encoding from 6 kbit/s to 510 kbit/s, frame sizes from 2.5 ms to 60 ms, and five sampling rates from 8 kHz (with 4 kHz bandwidth) to 48 kHz.
Speex: Narrowband (8 kHz), wideband (16 kHz), and ultra-wideband (32 kHz) compression in the same bitstream.
Our Product
OUR PRODUCT AND SERVICE OFFERINGS DRAW FROM EXTENSIVE INDUSTRY EXPERIENCE.
Adaptive Digital provides off the shelf algorithms, and customized high-quality voice software solutions including: High Definition Full-band Multi-Mic Acoustic Echo cancellation, and Best-in-class Echo Cancellation. Solutions include IP Intercom, IP Phone, and Multi-Mic Conference Engine with both Narrowband and wideband support. Our solutions ensure a consistent and clear communications experience for all call types, and our focus on product optimization and development gives us a competitive leading edge and differentiates us in the marketplace. We support customers from concept through deployment, helping to ensure that our products’ voice quality is carried into the end user experience.
Adaptive Digital’s highly optimized algorithms are offered as linkable object libraries with “C” callable functions or as turnkey DSP solutions. Our algorithms process calls every minute of every day in wireless, VoIP, traditional telephony, server, gateway, military, medical and Conferencing applications.
Adaptive Digital’s solutions support a low-cost product development model with short time-to-market. Our extensive knowledge of digital voice processing is proven by our outstanding reputation and repeat customer base.
Adaptive Digital is a member of Texas Instruments’ Third Party Developer Network, ARM’s Connected Community, and ARM’s Solution Center for Android (SCA).
Your Product Guarantee
OUR PRODUCT AND SERVICE OFFERINGS DRAW FROM EXTENSIVE INDUSTRY EXPERIENCE.
All Adaptive Digital standard ITU, ETSi, and GSM products come with a compliancy guarantee, to assure product performance on your application platform/device. Your Adaptive Digital custom products come with a pre-defined performance guarantee which assures your satisfaction in your products performance. Adaptive Digital can seal this level of assurance through integration and testing services which provide documented results of the product’s operability and performance.
Quality of Service
ADAPTIVE DIGITAL TECHNOLOGIES, INC. 1994
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