TV-SAT, CCTV, WLAN Dipol Weekly Review

Fabric that allows you to talk to AI and control devices.

Researchers from an international team have developed A-Textile, a new type of fabric that uses electrostatic phenomenon to record sound. This smart, flexible layer can turn everyday clothing into a microphone that allows direct communication with artificial intelligence systems. In traditional wearables, the problem has been stiff, heavy and insensitive acoustic sensors. In A-Textile, the researchers took a completely different approach - based on triboelectricity, the same phenomenon that causes clothes to be able to 'electrify'.

A-Textile is a multi-layered fabric in which each layer has a specific electrical function. At the core is a silicone coating with three-dimensional tin sulphide nanoparticles (SnS₂ NFs), which collect and transfer electrostatic charges. This layer rests on a textile carbon structure coated with the same nanoparticles, which allows charge storage and signal stabilisation.
When the wearer speaks, the sound waves cause microscopic vibrations in the fabric, causing the layers to rub against each other and generate small electrical charges. These in turn are transformed into a signal corresponding to the sound of speech. The fabric is able to pick up human speech with high precision even in noisy environments.
The signal generated by the fabric is sent wirelessly to a device - such as a smartphone - where a deep learning model analyses the data and recognises the commands. The neural network model used (2D CNN) classifies signals with an accuracy of up to 97.5 per cent (in laboratory tests, 93.5 per cent for 10 different voice commands).

The fabric has been designed with everyday use in mind. It is characterised by its flexibility, resistance to bending, moisture and washing, making it a viable candidate for commercial applications. Importantly, A-Textile can simply be sewn or adhered to an existing garment - there is no need to design a special garment. Harnessing the natural electrostatic properties of fabrics, it provides self-powered, high sensitivity and full frequency range human speech - all in the form of lightweight, flexible and 'invisible' textile electronics.
The system makes it possible to control IoT devices, such as turning on or off air conditioning, lighting, a TV or a cleaning robot. What's more, when combined with a generative AI model such as ChatGPT, the user can carry out conversations, get answers and perform complex tasks - all by voice, without the need for additional devices.

Intelligent image analysis in Sunell devices.

Similar to intelligent motion detection, the intelligent image analysis functions in Sunell cameras are based on deep learning algorithms, which enables precise recognition of people and vehicles. This in turn significantly reduces false alarms caused by irrelevant objects. Recordings can be quickly filtered to find those objects of interest.

The following detection functions are available:

• intrusion
• line crossing
• crossing of two lines
• walking
• driving against traffic

DIPOL SMART HORIZON - now with 5 - 12 V power supply.

A new version of the DVB-T2 SMART HORIZON COMBO A2270 antenna has been launched in DIPOL's offer. The DVB-T2 DIPOL SMART HORIZON TV antenna has been improved in terms of amplifier electronics and impedance matching circuitry, allowing for more stable reception of DVB-T2 signals in various field conditions. The modified amplifier board provides better impedance matching between the antenna and coaxial cable, resulting in lower signal losses, higher usable signal levels and noise reduction. An unquestionable advantage of the new antenna design is the wide range of DC 5...24 V power supply in active mode, so that the antenna can be powered from both a DVB-T2 tuner and an external power supply.

The antenna is equipped with a sealed box with F type connector. The box contains an antenna amplifier with a bypass that allows the antenna to work in two modes:

Redirecting calls from the Villa Hikvision IP door/gate station directly to a smartphone.

1-subscriber Villa Hikvision IP video door stations have the ability to be directly added to the Hikvision cloud and redirect calls to a smartphone with the Hik-Connect app installed without the need for an additional internal monitor (otherwise a monitor is always required). To use this functionality connect the gate/door station to the Internet via wired or Wi-Fi link, create an account at www.hik-connect.com, install the Hik-Connect, and add the device to the account. Once the system is configured, pressing the call button on the door station will set up a connection on the smartphone with the app installed. After answering the call, it will be possible to have a two-way conversation and open the electric door strike or the gate.

Visual fault locator (VFL) - the basic way to check a fibre optic cable.

In the event of a fault in a fibre optic system, we may be dealing with a fault in the active equipment or with damage to the transmission medium. In the latter case, the problem may be a cable that is too bent and consequently a broken fibre or, in the case of a fault in a switch / socket / cabinet, a fibre that is too bent or broken or, for example, a broken splice.

The simplest and also fastest method to verify the cause of the fault is to use a visual fault locator (VFL). It is a source of visible light, which, when connected to one side of the optical path, should glow on its other side. Most often LEDs operating at a wavelength of 650 nm (red) are used as the source, less often green LEDs (around 530 nm) are used.

In the case of fiber breakage along the cable route, an observer on the other side will not see the light. In the case of a bend causing significant signal attenuation, the luminescence should be noticeably weaker than in the case of an undamaged line. If this is the case, due to the large room for the watcher's subjective judgment, it is necessary to use an additional transmission measurement (light source and power meter). In the case of damage to the fiber or splice in the switch, things are much easier: excessive bending (or breakage) will cause a large leakage of light. The fiber alignment or splicing should then be corrected or spliced again, and the operation of the system should be verified.

DIPOL offers 2 VFL models: ULTIMODE VFL-V1-10 L5936 and ULTIMODE VFL-V3-15 L5939 differing mainly in power output and power supply.

Computer control from different locations.

In practice, many computer installations are made in a secure room (protected from physical theft), but image viewing and control is required from another point in the building (security room). Unfortunately, the distance of these rooms is limited by the length of the HDMI cable of the monitor and the USB cable of the mouse and keyboard. The solution is to convert these signals to IP transmission. Signal HD HDMI to IP converter H3613 enables the user to connect high-definition signal (HD) to a receiver (TV set, monitor) equipped with HDMI interface, via CAT5e or CAT6 cable. Additionally, there is possibility of extending the USB port, e.g. for controlling a mouse and keyboard.

Redundant power supply of SIGNAL PRO multiswitches - reliability of RTV/SAT installations In modern satellite and terrestrial TV installations stable power supply of multiswitches is essential for uninterrupted signal reception. The SIGNAL PRO series of multiswitches has been designed with reliability in mind and is equipped with the so-called redundant power supply system. Let us imagine that our installation consists of a cascade of e.g. 5 SIGNAL PRO multiswitches and one MS-900 R69900 amplifier. In this case, three power supplies can be used. In the case of failure of one of the power supplies, the other two cover the entire power requirements of the multiswitches and the system of two quatro converters. This way the user can be sure that the RTV/SAT signal will be available even if one of the power supplies is damaged or overloaded. The maintenance person of the installation at the periodic inspection should check the operation of the power supplies and, if necessary, replace the damaged one...>>>more