CATS is a system for storing many timeseries with different time bases including yearly, monthly, weekly, daily and many more. It comes with hundreds of collected time series from around the world, including both scientific and market data such as climate, astronomical, geophysical, economic, commodities, prices, and much more.

CATS can analyse series and determine cycles periods and phases precisely, and has many functions for manipulating data such as arithmetic, logs and transformations. It also includes multivariate techniques like correlation, regression, factor analysis and other tools that are useful for model building for economics, climate and in general studying the causal pathways by which cycles are transmitted.

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A telephone enables people to communicate by transmitting speech and other audio over distance. It converts sound into an electrical or radio signal, carries that signal through a network, and converts it back into sound at the receiving end.

Early telephones used analogue electrical currents over pairs of copper wires and manual switchboards. Automatic exchanges, long-distance cables, radio links, digital switching, fibre optics, satellites, and cellular networks greatly expanded their range and capacity.

Modern fixed and mobile telephones usually encode speech digitally. Calls may travel through circuit-switched networks, internet protocols, or combinations of several network technologies.

Telephone systems support voice calls, emergency access, voicemail, conferencing, messaging, data services, and video communication. Their development transformed personal communication, business, public administration, and social life while requiring large-scale standards, numbering plans, infrastructure, and regulation.

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• Source / publisher: Wikipedia
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• URL: https://en.wikipedia.org/wiki/Telephone

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Speech processing is the analysis, transformation, synthesis, coding, and recognition of spoken language using signal-processing and computational methods. It treats speech as both an acoustic waveform and a carrier of linguistic information.

Typical tasks include speech recognition, speaker identification, speech synthesis, enhancement, compression, translation, diarisation, and the detection of features such as pitch, formants, phonemes, and timing.

Systems may use digital filters, spectral analysis, statistical models, machine learning, and neural networks. Performance is affected by accents, speaking style, background noise, reverberation, microphone quality, language, and the amount of training data.

Speech processing is used in telephones, voice assistants, transcription, accessibility tools, hearing devices, security, broadcasting, language learning, customer service, and human–computer interaction.

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• URL: https://en.wikipedia.org/wiki/Speech_processing

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Sound recording is the capture and storage of sound so that it can be reproduced later. A recording system converts acoustic vibrations into a physical, electrical, magnetic, optical, or digital representation.

Early methods inscribed waveforms mechanically onto cylinders or discs. Later systems used microphones, electrical amplification, magnetic tape, optical film soundtracks, and digital sampling.

Digital recording measures a signal at regular intervals and represents its amplitude with numerical values. Sample rate, bit depth, microphone choice, room acoustics, noise, distortion, and dynamic range all affect the result.

Sound recording is used for music, film, broadcasting, speech, research, archives, communication, and field documentation. Modern production often includes multitrack recording, editing, mixing, processing, data compression, metadata, and long-term digital preservation.

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• URL: https://en.wikipedia.org/wiki/Sound_recording

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An electronic filter is a circuit or signal-processing system that passes selected frequency components while reducing others. Filters shape signals by changing amplitude and phase as a function of frequency.

Common types include low-pass, high-pass, band-pass, band-stop, and all-pass filters. Their behaviour is described by characteristics such as cutoff frequency, bandwidth, gain, roll-off, resonance, phase response, and group delay.

Analogue filters use resistors, capacitors, inductors, amplifiers, or switched-capacitor circuits. Digital filters process sampled data using algorithms and are commonly classified as finite-impulse-response or infinite-impulse-response systems.

Electronic filters are used in audio equipment, communications, power supplies, sensors, control systems, radio receivers, medical instruments, and data acquisition. Filter design balances selectivity, stability, noise, distortion, delay, computational cost, and component limitations.

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Delay-line memory is an early form of computer memory that stores information as a sequence of pulses travelling through a physical delay medium. The pulses circulate repeatedly, so electronic circuits must detect, regenerate, and reinsert them.

Some systems used acoustic waves travelling through mercury or solid materials, while others used electrical or magnetostrictive delay lines. Each line stored many bits in serial order rather than providing immediate access to every location.

Because a requested bit became available only when it reached the end of the line, access time depended on its position in the circulating sequence. Timing and pulse regeneration had to be carefully controlled to prevent data loss.

Delay-line memory was used in several early digital computers and radar systems before magnetic-core memory became dominant. It is historically important because it demonstrated practical recirculating storage using wave propagation and precisely timed feedback.

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• URL: https://en.wikipedia.org/wiki/Delay-line_memory

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Telecommunication is the transmission of information over distance by electrical, electromagnetic, optical, or acoustic systems. It includes telephony, broadcasting, computer networks, radio, television, fibre-optic links, satellites, and mobile communication.

A communication system normally includes a source, transmitter, channel, receiver, and destination. Information is converted into signals, carried through a medium, and reconstructed at the receiving end.

Signals may be analogue or digital and can be modulated, multiplexed, compressed, encrypted, filtered, and protected with error-correcting codes. Noise, attenuation, interference, delay, bandwidth, and capacity limit performance.

Modern telecommunications combine physical infrastructure with software, protocols, switching, routing, and spectrum management. They support personal communication, commerce, broadcasting, emergency services, scientific observation, transport, cloud computing, and the global internet.

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• URL: https://en.wikipedia.org/wiki/Telecommunication

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The Radiocommunications Agency was a former United Kingdom government executive agency responsible for managing the civil radio-frequency spectrum. Its work included licensing, frequency allocation, interference investigation, and enforcement of wireless-telegraphy regulations.

The agency coordinated spectrum use among broadcasting, telecommunications, business radio, satellite services, science, aviation, maritime users, and other sectors. It also represented UK interests in international spectrum-planning organisations.

Technical monitoring and field investigations were used to identify unauthorised transmissions and resolve harmful interference. The agency published licensing information, technical requirements, and guidance for radio users.

Its responsibilities were later transferred into the UK's converged communications regulator, Ofcom. The agency's history illustrates the need for public management of radio spectrum because many services must share a finite range of frequencies without disrupting one another.

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• URL: https://en.wikipedia.org/wiki/Radiocommunications_Agency

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Radio is the transmission and reception of information or energy using electromagnetic waves. A transmitter generates a radio-frequency signal, modulates it with information, and feeds it to an antenna, while a receiver detects and processes the transmitted wave.

Information may be carried by variations in amplitude, frequency, phase, pulse timing, or digitally encoded symbols. Radio systems can transmit speech, music, images, data, control commands, navigation signals, and measurements.

Propagation changes across the spectrum. Radio waves may travel by ground wave, reflect or refract in the ionosphere, pass through the atmosphere, follow line-of-sight paths, or be relayed by satellites and repeaters.

Applications include broadcasting, mobile phones, wireless networking, radar, remote control, satellite communication, emergency services, radio astronomy, and navigation. Reliable operation depends on antennas, modulation, bandwidth, power, coding, filtering, and spectrum management.

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Radio frequency refers to the portion of the electromagnetic spectrum commonly used for wireless communication, broadcasting, radar, navigation, sensing, and related technologies. It covers oscillations from very low frequencies through microwave frequencies.

Radio waves are generated by changing electric currents and can be transmitted and received with antennas. Their propagation depends on frequency, distance, terrain, atmospheric conditions, the ionosphere, and the design of the transmitting and receiving systems.

Different frequency bands are suited to different purposes. Lower frequencies may travel long distances or follow the Earth's surface, while higher frequencies support wider bandwidths but are often more dependent on line-of-sight paths.

Radio spectrum is a limited shared resource, so national and international authorities allocate bands and establish technical rules. Frequency planning aims to reduce harmful interference while supporting broadcasting, mobile communication, satellite services, science, aviation, maritime systems, and public safety.

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• URL type: WWW
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• URL: https://en.wikipedia.org/wiki/Radio_frequency