Advancement in Last Year From Board to Box

1
Digital Voice Over HF Using COTS, Part II
SIGNALogic

• Advancement in Last Year -- From Board to Box
• MELPe 600 bps Status
• Additional Algorithm Research Areas
• HF Radio Specifics

2
From Board to Box

• Vbox is a COTS Product Intended to Drop-In
  with Existing Equipment Small Size, Low Power
  Consumption Flow-Thru Operation existing
  equipment sends data normally voice packets
  are inserted as needed (voice-activated)

3
From Board to Box, Cont.

• Run-time selectable MELPe bit rates 2400,
  1200, and 600 bps I/O Intensive 4-Channel
  Audio, Quad RS-422, Dual RS-232 Ethernet
  10/100, USB Mil-Spec Connectors

4
From Board to Box, Cont.

• Vbox Uses COTS Internally for PC104
  motherboard and I/O DSP (Texas Inst C5xxx or
  C6xxx Series) Audio module Power board

5
From Board to Box, cont.

• DSP Modules are Small, Multi-Processor if
  Needed Scalable Voice Channel Density
  External Memory to Hold Multiple Types of Voice
  Codecs

6
MELPe 600 bps Status

• Selection Process 2004 3-Way Competition
  Harris, Thales Group, Signalogic AHWG Meeting
  and Winner Announcement in Ottawa, Oct 2004
  a Re-Test is Needed and Ongoing ?
• Voice Quality is Expected to be Outstanding
  based on Oct 2004 results will add to STANAG
  4591
• Results of Retest Available March 2005 Either
  Harris or Thales Group will be chosen

7
Additional Algorithm Research Areas

• Noise Pre-Processing Next major area of
  effort Lucent algorithm in the STANAG has
  issues dynamic configuration, depending on
  environment
• Adaptive Codebooks adapt quickly to current
  speaker increased DSP processing power allows
  more closed-loop analysis

8
Additional Algorithm Research Areas, cont.

• Core Algorithm Improvements MELPe has
  weaknesses in pitch detection, gain handling
  Incorporate telephony features one objective
  is music on hold, another is multi-pitch
  detection for multi-speaker environments
  Signalogics MELPe-Plus is an example of ongoing
  work in these areas

9
HF Radio Specifics

• Equipment Interfaces
• we have interfaced modems, including
  MDM-300x and Q9600 series (Rockwell) others?
  Need input we expect to see more Ethernet
  interfaces
• Clock Synchronization
• a COTS approach may use software PLL to
  synchronize line-side with system audio
• Towards Packet Based Communications
• a single system can combine HF Radio and
  SATCOM auto-negotiation to allow compatibility
  between voice codec types