All articles A–Z
519,064 articles
Sound recording and reproduction
Sound recording and reproduction, also known as sound reproduction, is the process of capturing sound in a storable form and recreating it later, reaching playback with Edison's phonograph of 1877.
Sound recording copyright symbol
The sound recording copyright symbol, ℗, is the letter P in a circle marking copyright in a sound recording, as distinct from the © mark.
Sound reinforcement system
A sound reinforcement system, also called live sound reproduction, combines microphones, loudspeakers, mixers, signal processors, and power amplifiers to distribute live or pre-recorded sound over a large area.
Sound speed profile
A sound speed profile is a record of how the speed of sound in seawater varies with depth, used in hydrographic surveying to convert acoustic travel times into depths and positions.
Sound stage
A sound stage is a large, soundproofed building on a film studio lot where sets are built and filmed under full control of sound and lighting.
Sound suppression water system
A sound suppression water system is a launch-pad installation that dumps large volumes of water at ignition and liftoff to dampen acoustics and protect the rocket.
Sound system (DJ)
Sound system (DJ): a crew-built rig of turntables, amplifiers and custom speaker stacks, born in 1950s Kingston with Coxsone Dodd and Duke Reid, spread to the UK via the Windrush generation, and central to clash, dubplate and club culture.
Sound Toll
The Sound Toll (Danish: Øresundstolden) was a transit toll Denmark levied on ships passing through the Sound, collected at Helsingør from about 1429 until 1857.
Sound Transit
Sound Transit is the regional public transit agency of the central Puget Sound region in Washington, operating Link light rail, ST Express buses, and Sounder commuter rail.
Sound transmission class
Sound transmission class (STC) is a single-number laboratory rating, calculated under ASTM E413, of how well a wall, floor, door, or window assembly blocks airborne sound such as speech.
Sound United
Sound United is an American consumer audio company founded in 2013, acquired by Masimo in 2022 and by HARMAN in 2025, whose brands include Bowers & Wilkins, Denon, and Polk Audio.
Sound Ventures
Sound Ventures is a Beverly Hills venture capital firm led by Ashton Kutcher, Guy Oseary, and Effie Epstein, known for its 2023 AI fund backing OpenAI and Anthropic.
Sound-absorbing materials
Sound-absorbing materials dissipate acoustic energy as heat through viscous friction in narrow pores, covering porous absorbers, resonant panel and Helmholtz absorbers, and how absorption is measured and rated.
Sound! Euphonium (響け！ユーフォニアム)
Sound! Euphonium (響け！ユーフォニアム, Hibike! Euphonium): Kyoto Animation's concert band youth anime adapted from Ayano Takeda's novel, airing 2015, 2016, and 2024 (NHK E-tele), with theatrical films and a 2026 two-part Final Movement finale, set in Uji, Kyoto.
Soundararaja (சௌந்தரராஜா)
Soundararaja (சௌந்தரராஜா), Tamil actor-producer born 1983 in Usilampatti, ex-engineer; villain in Sundarapandian (2012), Jigarthanda (2014), Bigil; TVK associate and Madurai Touring Talkies founder.
Soundariya Nanjundan
Soundariya Nanjundan (born 1995, Bengaluru) is an Indian actress in Tamil film, web series, and reality TV, known for Vera Maari Office, Darbar, and as Bigg Boss Tamil 8 runner-up.
Soundarya
Soundarya (సౌందర్య), the screen name of Sowmya Satyanarayana, was an Indian actress in Telugu cinema who made over 85 films before dying in a plane crash in 2004.
Soundarya Rajinikanth (சௌந்தர்யா ரஜினிகாந்த்)
Soundarya Rajinikanth (Shaku Bai Rao Gaikwad), born 1984, is an Indian Tamil film director, producer, and graphics designer, daughter of Rajinikanth; she directed Kochadaiiyaan (2014), India's first photorealistic motion-capture film, and VIP 2.
Soundbar
A soundbar is a long, narrow loudspeaker enclosure placed below or beside a television to improve on thin TV speakers, ranging from stereo bars to Dolby Atmos systems.
Soundcity TV
Soundcity TV, also known as Soundcity Africa, is a Lagos-based pan-African urban music and lifestyle channel owned by Consolidated Media Associates, broadcasting around the clock across Africa.
SoundCloud
SoundCloud is an audio platform founded in Berlin in 2007 where creators upload, share, and stream sound, hosting more than 400 million tracks from over 40 million artists.
SoundCloud indie
SoundCloud indie is a guitar-led music scene on the SoundCloud platform blending alt-rock with hip-hop and lo-fi bedroom production; artists include bunii, Ebril, yiru, and kid moon, and the scene grew over 2.5 times in 2025.
Soundcore (audio brand)
Soundcore (声阔) is the audio brand of Anker Innovations, a Chinese consumer-electronics group founded in 2011, selling wireless earbuds, headphones, and speakers in more than 50 countries.
Soundcore Capital Partners
Soundcore Capital Partners is a New York-based private equity firm founded by Jarrett Turner in 2015 that makes buy-and-build investments in lower middle-market businesses in the United States and Canada.
Sounder (film)
Sounder (1972) is Martin Ritt's drama, adapted by Lonne Elder III from William H. Armstrong's Newbery-winning novella, about a Louisiana sharecropper family; starring Cicely Tyson, Paul Winfield, and Kevin Hooks, it earned four Oscar nominations and joined the National Film Registry in 2021.
Soundex
Soundex is a phonetic algorithm that converts names, especially surnames, into letter-plus-three-digit codes by English sound, patented in 1918 and used to index United States censuses.
SoundFont
SoundFont is a sample-based synthesis file format developed by E-mu Systems and Creative Technology, introduced with the Sound Blaster AWE32 in 1994; its current version, 2.04, dates from 2002.
Soundgarden
Soundgarden is an American rock band formed in Seattle in 1984, fronted by Chris Cornell. Among the first grunge bands, it peaked with Superunknown in 1994.
Soundgarden discography
Soundgarden discography: catalog of the Seattle grunge band, six studio albums from Ultramega OK (1988) to King Animal (2012), plus Screaming Life EP, Superunknown's Billboard No. 1, and a pending final album.
SoundHound AI
SoundHound AI, Inc. is a Santa Clara, California, voice and agentic AI company that builds speech recognition and conversational AI products for automotive, restaurant, and enterprise customers.