Split-band scrambler for private communications
28 February 2001
Telecoms, Datacoms, Wireless, IoT
CML is offering a simple-to-use dual mode voice-band scrambler that it claims is low cost and that will keep your conversations private. The company's CMX264 frequency domain scrambler uses split-band frequency inversion scrambling which provides a superior level of speech privacy than single inversion methods often employed by other solutions. To further enhance security the device has easy-to-implement fixed and rolling code capabilities. All the filtering required is also featured on-chip.
Typical current requirement is 3 mA at 3,0 V making the CMX264 an ideal solution for any audio application where low power consumption is critical. These include mobile radio and FRS/PMR446 handsets, both wireline and mobile telephones, fixed or rolling code voice scramblers and baby alarms. Energy efficiency is increased by the devices' standby mode.
The CMX264 operates using a simple serial interface or microprocessor control. For full duplex operation Tx and Rx audio paths are separate. In the Tx path, scrambling is achieved by splitting the audio into two parts and frequency inverting each one. The frequency at which the signal is split, the 'split-point', can be either fixed or rolling between four possible settings. This results in a transmitted audio which is unintelligible to eavesdroppers.
Descrambling is achieved by a receive device set to the same split-point as the remote transmitter. Thus if the Tx and Rx devices are synchronously cycled through the same sequence of split points, a clear recovered signal will emerge at the output of the receiver. The use of a 4,433619 MHz crystal allows up to four split points to be programmed. It comes in a in 24-pin SSOP package.
[email protected]
Further reading:
Quectel partners with GEODNET
Quectel Wireless Solutions
Telecoms, Datacoms, Wireless, IoT
Quectel Wireless Solutions has partnered with GEODNET to deliver Quectel’s Real-Time Kinematic (RTK) correction services, enabling high-precision positioning for IoT applications.
Read more...
Bringing Bluetooth Channel Sounding to automotive and beyond with KW47
Altron Arrow
Telecoms, Datacoms, Wireless, IoT
NXP’s new Channel Sounding-certified KW47 and MCX W72 wireless MCUs are set to help automakers with distance measurement, bringing an additional ranging solution for car access and autonomous systems, and will be utilised across a broader spectrum of applications.
Read more...
Dual-band GNSS antenna
RF Design
Telecoms, Datacoms, Wireless, IoT
The Taoglas Accura GVLB258.A, is a passive, dual-band GNSS L1/L5, high-performance antenna for high precision GNSS accuracy and fast positioning.
Read more...
What is Wi-Fi HaLow and why choose it for IoT?
iCorp Technologies
Editor's Choice Telecoms, Datacoms, Wireless, IoT
Wi-Fi HaLow introduces a low power connectivity option that, in contrast to other Wi-Fi options, offers greater range of approximately 1 km, which opens up a raft of IoT use cases.
Read more...
Wi-Fi 6 and Bluetooth LE coprocessor module
Altron Arrow
Telecoms, Datacoms, Wireless, IoT
The ST67W611M1 from STMicroelectronics boasts an all-in-one design which, together with its capabilities, contribute to making it an attractive choice for IoT edge devices requiring a single-chip solution.
Read more...
Futureproofing IoT connectivity
SIMcontrol
Telecoms, Datacoms, Wireless, IoT
A managed private APN assigns every device to an isolated carrier slice, producing a single ingress to the enterprise network, with traffic bypassing shared internet paths and reducing exposure.
Read more...
Extra slim 2,4 GHz radio module
Telecoms, Datacoms, Wireless, IoT
The Thyone I radio module from Würth Elektronik now has a little sibling: Thyone-e, which takes up 30% less space and represents a cost-effective alternative for applications in which the long-range mode is not required.
Read more...
Wi-Fi 6 plus Bluetooth LE SoC
Altron Arrow
Telecoms, Datacoms, Wireless, IoT
Silicon Labs’ SiWx917M SoC is the company’s lowest power Wi-Fi 6 SoC, ideal for ultra-low power IoT wireless devices using Wi-Fi, Bluetooth, Matter, and IP networking for secure cloud connectivity.
Read more...
Two Bluetooth protocols – one module
Telecoms, Datacoms, Wireless, IoT
Würth Elektronik has introduced its Skoll-I, a compact wireless module that combines both Bluetooth Classic and Bluetooth Low Energy version 5.4 into a single solution.
Read more...
Compact high-performance antennas
Electrocomp
Telecoms, Datacoms, Wireless, IoT
KYOCERA AVX offers a variety of extremely compact and high-performance internal, on-board, multiprotocol 2,4 GHz antennas ideal for use in SiP applications.
Read more...