Complete Communications Engineering

VOCAL’s vocoder transcoding software provides efficient and scalable solutions for converting between multiple vocoders. Our voice transcoder seamlessly converts audio streams from one codec to another on-the-fly. Transcoding between different rates of the same vocoder is also supported. VOCAL’s optimized speech coder transcoding software solutions minimize application resources and bandwidth.

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VOCAL software libraries provide a comprehensive suite of ITU, GSM, wideband and special purpose vocoders including MELP / MELPe, LPC-10, G.729AB, Opus, GSM-FR, GSM-EFR, G.722.2 (AMR-WB), Silk, Speex, iLBC, G.711 and more. With our extensive background and expertise with multiple voice compression algorithms, our voice codec transcoding software is designed for VoIP application developers needing a toll-quality end-to-end experience for different vocoder requirements.

VOCAL’s vocoder transcoding software may be licensed standalone or as a library with custom solutions available to meet unique application requirements. Our software libraries provide a complete range of voice compression, speech coder transcoding, and other standard and proprietary algorithms optimized for execution on ANSI C and leading DSP architectures (TI, ADI, AMD, ARM, MIPS, CEVA, LSI Logic ZSP, etc.). Native SDKs are also available for Android, iOS, and other mobile VoIP applications.

Vocoder Transcoding Software Features



VOCAL’s optimized vocoder software is available for the following platforms. Please contact us for specific vocoder supported platforms and performance data.

ProcessorsOperating Systems
  • Texas Instruments – C6xx (TMS320C62x, TMS320C64x, TMS320C645x, TMS320C66x, TMS320C67x), DaVinci, OMAP, C5xx (TMS320C54x, TMS320C55x)
  • Analog Devices – Blackfin, ADSP-21xx, TigerSHARC, SHARC
  • PowerPC, PowerQUICC
  • MIPS – MIPS32, MIPS64, MIPS4Kc
  • ARM – ARM7, ARM9, ARM9E, ARM10E, ARM11, StrongARM, ARM Cortex-A8/A9, Cortex-M3/M4
  • Intel / AMD – x86, x64 (both 32 and 64 bit modes)
  • Linux, uClinux, BSD, Unix
  • Microsoft Windows ACM / RTC / CE / Mobile
  • Apple iOS / iPhone / iPad & MacOS
  • eCOS / eCOSPro
  • Google Android
  • Green Hills Integrity
  • Micrium μCOS
  • Symbian
  • Wind River VxWorks