VoIP stands for Voice over Internet Protocol, which is a
means of digitizing voice signals and sending them over
a digital network. The digital network can be a LAN (Local
Area Network), WAN (Wide Area Network), or the Internet
itself. The NXU-2 and NXU-X embodies this VoIP technology
in a way that enables communications radios to be interconnected
across the room or around the world. The PortaLink is an
extension of the NXU-2, incorporating it with a wireless
network to allow a radio’s voice and RS-232 at a remote
location to be linked to an ACU-1000.
Radio/Telephone Interface Units
The phone patch family uses a digital signal processor
(DSP) to dynamically provide a broadband hybrid null,
thus eliminating VOX falsing and other problems that are
characteristic of other phone patches.
VMR-12A Voice Modulation Recognition Unit
The VMR-12 Voice Modulation Recognition Unit is packaged
in a 19 inch EIA standard rack-mounted Eurocard cage.
A Power Supply Module and up to twelve VMM-2 Voice Modulation
Recognition Modules are plugged into the card cage backplane.
Each VMM-2 Module provides the next generation of reliable
speech detection capability in noisy audio signals by
using state of the art Digital Signal Processing (DSP)
techniques. Each module’s DSP is capable of accurately
detecting speech, including the elusive first syllable,
in any of the following audio sources: in audio received
by a radio; in a noisy phone line; in a tape recording
made under adverse conditions; or in an intercom system
being used in a high ambient background noise environment.
The SNV selects the input channel with the best quality
audio based on the DSP computed signal-to-noise ratio
of the incoming audio signals.
The PPS-100 Pre/Postselector permits operation of co-located
receivers and transmitters on frequencies separated by
as little as 10%. When used with receivers, the unit functions
as a preselector, providing an additional front end selectivity
stage. This reduces the receiver desensitization and overload
that would normally occur in the presence of strong adjacent
RF transmissions. The unit is used as a postselector with
transmitters. It rejects spurious outputs and broadband
noise in the transmit signal before it reaches the power
amplifier, thereby limiting interference to neighboring
receivers. The PPS-100 performs both functions with a
transceiver; it follows the radio’s key line and
switches between the preselector and postselector modes.
MTX-1616 Audio/Digital Switch Matrix
Our’ MTX-1616 Audio/Digital Switch Matrix provides
a flexible single-unit answer to the need for different
switching circuits for each of the many configurations.
The unit has been designed to switch both audio controls
and control signals simultaneously; the standard configuration
contains both a 16x16 audio switch matrix and a 16x8 delay
TRP-1000 Transportable Radio Interconnect
The TRP-1000 Transportable Radio Interconnect System provides
radio interoperability during missions requiring communications
between diverse organizations using different radios and
different frequencies. The system package consists of
one or more transportable cases and includes multiple
radios pre-wired to JPS Communications’ ACU-1000
Intelligent Interconnect Unit. The radios, which cover
all frequency bands can be cross-connected through the
NRU-600 DSP Noise Reduction Unit
The NRU-600 is an advanced audio signal processor that
provides maximum flexibility to eliminate or reduce most
types of interference from voice, CW and data transmissions.
The unit uses a high speed Digital Signal Processor (DSP)
to provide simultaneous bandpass filtering, noise reduction
and multiple tone/heterodyne removal. An automatic Notch
filter removes multiple heterodynes from tune-ups, adjacent
channel carriers, CW, RTTY, or similar signals without
interfering with voice signals when a voice bandwidth
has been selected. The notch filter operates in 5 milliseconds
or less. Two noise reduction algorithms are provided in
the NRU-600: an FD (Frequency Domain) algorithm and a
TD (Time Domain) algorithm; to give the operator the best
audio noise reduction possible.