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:

Smart farming with LoRaWAN
Otto Wireless Solutions Telecoms, Datacoms, Wireless, IoT
Real-time visibility is transforming modern agriculture, and Otto Wireless Solutions, together with Dragino, deliver this capability through a comprehensive suite of long-range IoT sensors and gateways designed for smart farming.

Read more...

---

RTK-enhanced GNSS and INS solution
Dizzy Enterprises Telecoms, Datacoms, Wireless, IoT
This latest XSENS MTi-8 Click provides high-accuracy positioning (RTK-supported) and orientation tracking in demanding outdoor embedded applications.

Read more...

---

High-performance double balanced RF mixer
RFiber Solutions Telecoms, Datacoms, Wireless, IoT
The AM5008 from Mercury Systems is a high-performance, double-balanced MMIC mixer designed for wideband applications spanning 2 GHz to 24 GHz.

Read more...

---

Compact NFC antennas enable easy integration
Telecoms, Datacoms, Wireless, IoT
Leankon has expanded its 13,56 MHz NFC antenna portfolio with a comprehensive suite of nine off the shelf products designed for next generation IoT applications.

Read more...

---

Ultra-low jitter clocks
Altron Arrow Telecoms, Datacoms, Wireless, IoT
Skyworks has introduced a new family of ultra-low jitter programmable clocks designed to meet the increasing demands of next-gen connectivity.

Read more...

---

Efficient Bluetooth SoC
Altron Arrow Telecoms, Datacoms, Wireless, IoT
The EFR32BG29 wireless SoC from Silicon Labs is a highly efficient, high memory, low-power, and ultra compact SoC designed for secure and high-performance wireless networking for IoT devices.

Read more...

---

Minimal size, maximum flexibility
Würth Elektronik eiSos Telecoms, Datacoms, Wireless, IoT
Würth Elektronik has introduced two highly compact radio modules that give developers maximum freedom in designing proprietary wireless solutions that go beyond standard protocols.

Read more...

---

Super Wi-Fi extends industrial connectivity
NEC XON Telecoms, Datacoms, Wireless, IoT
Africa’s harshest mines, ports, and industrial parks are no longer bound by range, latency, and interference challenges.

Read more...

---

HackRF Pro advances Open SDR performance
IOT Electronics Telecoms, Datacoms, Wireless, IoT
Designed for engineers, researchers, and radio enthusiasts alike, the HackRF Pro can transmit and receive signals across a wide frequency range of 100 kHz to 6 GHz, making it a versatile tool for testing and developing modern and emerging radio technologies.

Read more...

---

Deterministic high-speed Ethernet
Telecoms, Datacoms, Wireless, IoT
The Fraunhofer Institute for Photonic Microsystems IPMS has developed a new 10G TSN endpoint IP Core, enabling deterministic real-time communication at data rates of up to 10 Gbit/s.

Read more...

---