G.722
AUDIO CODER
16 kHz sampled audio signals for transmission over 48, 56, and 64 kbps channels
Features List
- Functions are C-callable.
- Multi-channel capable
- Can be integrated with echo cancellers, VOX and tone detection/regeneration.
- Can be integrated with G.711/G.728 to provide the audio portion of the H.320 video standard.
- The encoder and decoder meet all ITU G.722 compliance data files.
- C55x and ARM – Optional Packet Loss Concealment (PLC): Proprietary technique developed by Adaptive Digital.
- ARM, Win32, and i686 – Optional PLC compliant to G.722 Appendix IV Standard
Coding Rate: 48, 56, or 64 kbps, and 23.85 kbps
Sampling Rate: 16 kHz
Delay: 125 microseconds
Availability
| Platforms | G.722 | G.722 with PLC | G.722 AnnexIV |
| Arm ® Devices – Armv7-A Cortex-A8 / A9 / A15, | Cortex-M3 / M4 / M7 || Armv8-A Cortex-A53/A57 || Legacy ARM9E | Cortex-A8/A9/A15 || Cortex-M3 / M4 || Legacy ARM9E /11 | Cortex-A8/A9/A15 | Cortex-A53/A57 || Cortex-M3 / M4 || Legacy ARM9E /11 | Cortex-A8/A9/A15 | Cortex-A53/A57 || Cortex-M3 / M4 || Legacy ARM9E /11 |
| Texas Instruments – TI TMS320C6000 C64x/C64x+/C66x, C674x, TMS320C5000 C55x / C54x | C674x / C64x / C55x / C54x | — | — |
| Windows x86 (32-bit) / x64 (64-bit) | — | Win 32-bit LIB / DLL | Win 32-bit LIB / DLL |
| Linux 32-bit / 64-bit | — | Linux 32-bit | Linux 32-bit |
ADT G.722 is available on the above Platforms: 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.
ARM Devices
TI Processors
Windows
Linux
ARM Devices
G.722 Cortex-A8 / A9 / A15 | Cortex-M3 / M4
CPU Utilization & Memory RequirementsAll Memory usage is given in units of byte.
| Function | MIPS Cortex-M3 / M4 | MIPS Cortex- A8 / A9 / A15 | Program Memory | Data Memory | Per Channel Data Memory | Scratch Memory |
| G.722 Encode | 12.4 | 5.9 | 6996 | 1284 | 146 | 624 |
| G.722 Decode | 11.3 | 5.3 | 624 |
G.722 with PLC Cortex-A8 / A9 / A15 / A17
CPU Utilization & Memory RequirementsAll Memory usage is given in units of byte.
| Function | MIPS | Program Memory | Data Memory | Per Channel Data Memory |
| G.722 Encode | 13.5 | 42 K | 7.6 K | 288 |
| G.722 Decode | 7.4 | 288 | ||
| G.722 Decode w/ PLC Enable | 11.1 | 4248 |
G.722 Annex IV Cortex-A8 / A9 / A15 / A17
CPU Utilization & Memory RequirementsAll Memory usage is given in units of byte.
| Function | MIPS | Program Memory | Data Memory | Per Channel Data Memory |
| G.722 Encode | 13.5 | 43 K | 7.7 K | 288 |
| G.722 Decode | 7.4 | 288 | ||
| G.722 Decode w/ PLC Enable | 11.1 | 2020 |
G.722 with PLC Cortex-M3 / M4
CPU Utilization & Memory RequirementsAll Memory usage is given in units of byte.
| Function | MIPS | Program Memory | Data Memory | Per Channel Data Memory |
| G.722 Encode | 16.1 | 30 K | 1.5 K | 288 |
| G.722 Decode | 15.2 | 288 | ||
| G.722 Decode w/ PLC Enable | 22.3 | 4248 |
* Adaptive Digital’s G.722 ARM-Cortex-A device family version also has optional packet loss concealment (PLC) plus a proprietary VAD/CNG/DTX feature.
G.722 Annex IV Cortex-M3 / M4
CPU Utilization & Memory RequirementsAll Memory usage is given in units of byte.
| Function | MIPS | Program Memory | Data Memory | Per Channel Data Memory |
| G.722 Encode | 16.1 | 30 K | 1.7 K | 288 |
| G.722 Decode | 15.2 | 288 | ||
| G.722 Decode w/ PLC Enable | 21.3 | 2020 |
G.722 ARM9e / ARM11
CPU Utilization & Memory RequirementsAll Memory usage is given in units of byte.
| Device | MIPS | Program Memory | Data Memory | Per Channel Data Memory |
| ARM9e | 25.5 | 5.3 K | 1.3 K | 292 |
| ARM11 | 41.4 | 5.3 K | 292 |
G.722 with PLC ARM9e / ARM11
CPU Utilization & Memory RequirementsAll Memory usage is given in units of byte.
| Function | MIPS | Program Memory | Data Memory | Per Channel Data Memory |
| G.722 Encode | 11.3 | 34 K | 7.6 K | 288 |
| G.722 Decode | 11 | 288 | ||
| G.722 Decode w/ PLC Enable | 16.9 | 4248 |
*PLC Decode MIPS measurement taken with simulated 2% packet loss.
G.722 Annex IV ARM9e / ARM11
CPU Utilization & Memory RequirementsAll Memory usage is given in units of byte.
| Function | MIPS | Program Memory | Data Memory | Per Channel Data Memory |
| G.722 Encode | 11.3 | 58 K | 7.7 K | 288 |
| G.722 Decode | 11 | 288 | ||
| G.722 Decode w/ PLC Enable | 16.9 | 2020 |
TI Processors
G.722 C64x / C64x+ / C66x / C674x
CPU Utilization & Memory RequirementsAll Memory usage is given in units of byte.
| Function | MIPS | Program Memory | Data Memory | Per Channel Data Memory |
| G.722 Encode | 5.3 | 4768 | 1426 | 192 |
| G.722 Decode | 4.8 |
G.722 C64x / C64x+ Variant
PROCESSES 2 CHANNELS SIMULTANEOUSLY THEREBY BY REDUCING THE PER CHANNEL MIPS BY A FACTOR OF 2CPU Utilization & Memory Requirements
All Memory usage is given in units of byte.
| Device | MIPS | Program Memory | Data Memory | Per Channel Data Memory |
| Encode Variant | 2.84 | 8000 | 1664 | 364 |
| Decode Variant | 2.36 |
Variant *Note: Above numbers for non-cached. After caching, cycle count will improve.
G.722 C55x
CPU Utilization & Memory RequirementsAll Memory usage is given in units of byte.
| Device | MIPS | Program Memory | Data Memory | Per Channel Data Memory |
| Encode | 6.0 | 2717 | 1212 | 164 |
| Decode | 4.8 | 164 | ||
| Decode with PLC* enable | 5.5 | 3811 | 609 | 3528 |
*Note: Proprietary technique developed by Adaptive Digital.
G.722 C54x
CPU Utilization & Memory RequirementsAll Memory usage is given in units of byte.
| Function | MIPS | Program Memory | Data Memory | Per Channel Data Memory |
| Encode | 7.5 | 1438 | 654 | 80 |
| Decode | 6.4 | 80 |
Windows
G.722 with PLC Win DLL
CPU Utilization & Memory RequirementsAll Memory usage is given in units of byte.
| Function | MIPS | Program Memory | Data Memory | Per Channel Data Memory |
| G.722 Encode | 14.5 | 12 K | 9.3 K | 288 |
| G.722 Decode | 12.9 | 288 | ||
| G.722 Decode w/ PLC Enable | 14.9 | 4248 |
*PLC Decode MIPS measurement taken with simulated 2% packet loss.
G.722 with PLC WIN Static Lib
CPU Utilization & Memory RequirementsAll Memory usage is given in units of byte.
| Function | MIPS | Program Memory | Data Memory | Per Channel Data Memory |
| G.722 Encode | 13.9 | 12 K | 9.3 K | 288 |
| G.722 Decode | 12.9 | 288 | ||
| G.722 Decode w/ PLC Enable | 14.9 | 4248 |
*PLC Decode MIPS measurement taken with simulated 2% packet loss.
G.722 Annex IV WIN32 – DLL or Static Library
CPU Utilization & Memory RequirementsAll Memory usage is given in units of byte.
| Function | MIPS | Program Memory | Data Memory | Per Channel Data Memory |
| G.722 Encode | 13.6 | 31 K | 18 K | 288 |
| G.722 Decode | 12.9 | 288 | ||
| G.722 Decode w/ PLC Enable | 13.3 | 2020 |
*PLC Decode MIPS measurement taken with simulated 2% packet loss.
Linux
G.722 with PLC i686
CPU Utilization & Memory RequirementsAll Memory usage is given in units of byte.
| Function | MIPS | Program Memory | Data Memory | Per Channel Data Memory |
| G.722 Encode | 11.2 | 27 K | 7.6 K | 288 |
| G.722 Decode | 11.2 | 288 | ||
| G.722 Decode w/ PLC* Enable | 13.9 | 4248 |
*PLC Decode MIPS measurement taken with simulated 2% packet loss.
G.722 Annex IV i686
CPU Utilization & Memory RequirementsAll Memory usage is given in units of byte.
| Function | MIPS | Program Memory | Data Memory | Per Channel Data Memory |
| G.722 Encode | 10.8 | 51 K | 7.7 K | 288 |
| G.722 Decode | 10.5 | 288 | ||
| G.722 Decode w/ PLC Enable | 10.8 | 2020 |
*PLC Decode MIPS measurement taken with simulated 2% packet loss.
Description
The Adaptive Digital Technologies G.722 Audio Coder is a real-time implementation of the ITU G.722 audio coder. It is used with many applications that require audio frequency bandwidth coding such as video conferencing, multimedia, and speaker/microphone digital telephony. The G.722 audio coder encodes 16 kHz sampled audio signals for transmission over 48, 56, and 64 kbps channels, and provides 7 k Hz of audio bandwidth.
Adaptive Digital’s G.722PLC is a high quality low-complexity proprietary algorithm for packet loss concealment with G.722. G.722 on TI’s C55x™DSP, and ARM devices support an optional Packet Loss Concealment (PLC) features on the decoder side. We also offer a PLC algorithm compliant to the G.722 Appendix IV Standard.
Adaptive Digital’s implementation of G.722 includes a proprietary VAD/CNG/DTX (Voice Activity Detection, Comfort Noise Generation / Discontinuous Transmission) feature. While many VoIP and wireless codecs include this type of functionality as part of the standard, G.722 does not. Adaptive Digital therefore implemented a proprietary implementation that is voice-quality-optimized for the G.722 codec. Adaptive Digital plans to make this available on other platforms in the near future.
In Appendix IV, the decoder comprises three stages: lower sub-band decoding, higher sub-band decoding and quadrature mirror filter (QMF) synthesis. In the absence of frame erasures, the decoder structure is identical to ITU-T G.722, except for the storage of the two decoded signals, of the higher and lower sub-bands. In case of frame erasures, the decoder is informed by the bad frame indication (BFI) signalling. It then performs an analysis of the past lower-band reconstructed signal and extrapolates the missing signal using linear predictive coding (LPC), pitch-synchronous period repetition and adaptive muting. Once a good frame is received, the decoded signal is cross-faded with the extrapolated signal. In the higher sub-band, the decoder repeats the previous frame pitch synchronously, with adaptive muting and high pass post-processing. The adaptive differential pulse code modulation (ADPCM) states are updated after each frame erasure.
Function APIs
API function call summary
ResetG722 ()
EncodeG722 ()
DecodeG722 ()
Initializes the G.722 audio coder Channel structures
Executes the G.722 encoder
Executes the G.722 decoder