Test & Measurement

G.722 wideband audio codec supported across TDM and VoIP applications

12th May 2014
Mick Elliott

GL Communications has released its enhanced VoIP and T1 E1 platform applications with G.722 Wideband Audio Codec support. Vijay Kulkarni CEO of the company said, “Despite revolutionary advances in telecommunications technology, audio quality has remained virtually unchanged for nearly 50 years!”



The GL Communications products support G.722 with a variety of signaling and audio processing applications in both VoIP and TDM. Using these applications, users can emulate, analyse, and troubleshoot audio signalling and quality over both VoIP and TDM.

Applications supporting G.722 over IP are : PacketScan, a versatile Packet Analyser for VoIP that supports many signaling protocols like H.323, SIP, RTP, Skinny, Megaco, and more. It also supports many codecs including G.722. And PacketGen, a SIP protocol emulator, VQuad SIP, a voice and data quality test tool, and all GL’s MAPS Emulation products support G.722.

Vijay Kulkarni explained, “Applications Supporting G.722 over TDM: In both A-Law and µ-Law PCM (64kbps), 8 bits are required to represent each sample. It can be seen that PCM operates at a rate of: 8 bits/sample * 8000 samples/sec = 64000 (64K) Bits Per Second. G.722 uses two 4-bit samples in the same 8-bit space, thereby using the same capacity with better quality. ISDN Analyzer and Call Capture & Analysis (CCA) application are now supported with wideband G.722 codec. Also, Voice Band Analyzer (VBA) application operates in near real time, processing the signal files recorded by Call Capture Application (CCA) has been enhanced to support G.722 at 64 kbps. It captures and decompresses G.722 to 14-bit PCM file.”

Real-Time Multi-Channel Audio Bridge application provides a bridge between T1/E1 timeslots and single or multichannel sound card(s). Supported codecs data rates are - a-law, µ-law, 16-bit PCM (Intel), 16-bit PCM (Motorola), G.726 (40 Kbps, 32 Kbps, 24 Kbps, and 16 Kbps) and now G.722 (64 kbps) as well. Mono and Stereo audio modes are supported.

The Audio Compression Manager (ACM) Tester is used to compress and decompress audio files. This utility also supports a wide range of codecs, including G.722 wideband codec. It also supports compressing voice files (Raw PCM and *.WAV formats) and decompressing the compressed files and *.BIN (binary audio files) files.

Oscilloscope and Power Spectral applications include options for displaying all signaling formats – a-law, µ-law, PCM 16 bit, PCM 13 bit, PCM 14 bit, PCM 8 bit and different byte order for INTEL (Little Endian) and MOTOROLA (Big Endian) 16 bit signals sampled at 16 KHz can also be displayed.

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