iSAC

iSAC

internet Speech Audio Codec

iSAC: A wideband and super wideband audio codec for VoIP and streaming audio. 

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Features List

  • Bitrates from 10 to 32 kbps in wideband 
  • Bitrates from 10 to 56 kbps in super-wideband
  • Supports 16 kHz and 32 kHz input/output sampling rates
  • Frame size of 30 or 60 ms

The iSAC codec compresses speech frames of 16 kHz, 16-bit sampled input speech, each frame containing 30 or 60 ms of speech.

Availability

Platforms
Arm Devices Armv8A Cortex-A53

ADT iSAC is currently available on the above Platform: Other configurations are available upon request.

Specifications

NOTE: We specify MIPS (Millions of Instructions Per Second) as MCPS (Millions of Instruction Cycles Per Second). Unless otherwise specified, peak MIPS are indicated.

↓  Click on links below to view specification tables. 

Sampling rate: 16000

Frame Len: 960 (60ms/frame)

Bit rate: 32000

iSAC ARM Cortex-A53

CPU Utilization
FunctionMIPS
Encode31.7
Decode14.5
 

Description

internet Speech Audio Codec (iSAC) is a wideband speech codec, developed by Global IP Solutions. It is suitable for VoIP applications and streaming audio. The encoded blocks have to be encapsulated in a suitable protocol for transport, e.g. RTP.  iSAC codec delivers high-quality speech in both low-bit rate and high-bit rate voice applications. 

Function APIs

API function call summary

iSACFIX_encoderinit(): initialize an iSAC encode channel 
iSACFIX_decoderinit(): initialize an iSAC decode channel
iSACFIX_encode(): perform iSAC encode
iSACFIXdecode(): perform iSAC decode
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