Compact Disc Digital Audio, also known as Digital Audio Compact Disc or simply as Audio CD, is the standard format for audio compact discs. The standard is defined in the Red Book, one of a series of Rainbow Books that contain the technical specifications for all CD formats.
Digital audio is a representation of sound recorded in, or converted into, digital form. In digital audio, the sound wave of the audio signal is typically encoded as numerical samples in a continuous sequence. For example, in CD audio, samples are taken 44,100 times per second, each with 16-bit sample depth. Digital audio is also the name for the entire technology of sound recording and reproduction using audio signals that have been encoded in digital form. Following significant advances in digital audio technology during the 1970s and 1980s, it gradually replaced analog audio technology in many areas of audio engineering, record production and telecommunications in the 1990s and 2000s.
The cassette culture refers to the practices associated with amateur production and distribution of music and sound art on compact cassette that emerged in the mid-1970s. The cassette was used by fine artists and poets for the independent distribution of new work. This article focuses on the independent music scene associated with the cassette that burgeoned internationally in the second half of the 1970s.
The Compact Cassette, also commonly called a cassette tape, audio cassette, or simply tape or cassette, is an analog magnetic tape recording format for audio recording and playback. Invented by Lou Ottens and his team at the Dutch company Philips in 1963, Compact Cassettes come in two forms, either containing content as a prerecorded cassette (Musicassette), or as a fully recordable "blank" cassette. Both forms have two sides and are reversible by the user. Although other tape cassette formats have also existed—for example the Microcassette—the generic term cassette tape is normally used to refer to the Compact Cassette because of its ubiquity.
Digital Audio Tape is a signal recording and playback medium developed by Sony and introduced in 1987. In appearance it is similar to a Compact Cassette, using 3.81 mm / 0.15" magnetic tape enclosed in a protective shell, but is roughly half the size at 73 mm × 54 mm × 10.5 mm. The recording is digital rather than analog. DAT can record at sampling rates equal to, as well as higher and lower than a CD at 16 bits quantization. If a comparable digital source is copied without returning to the analogue domain, then the DAT will produce an exact clone, unlike other digital media such as Digital Compact Cassette or non-Hi-MD MiniDisc, both of which use a lossy data-reduction system.
A cassette deck is a type of tape machine for playing and recording audio cassettes that does not have a built-in power amplifier or speakers, and serves primarily as a transport. It can be a part of an automotive entertainment system, a part of a portable mini system or a part of a home component system. In the latter case it is also called a component cassette deck or just a component deck.
The Royal National Institute of Blind People (RNIB) is a UK charity offering information, support and advice to almost two million people in the UK with sight loss.
An album is a collection of audio recordings issued on compact disc (CD), vinyl, audio tape, or another medium such as digital distribution. Albums of recorded sound were developed in the early 20th century as individual 78 rpm records collected in a bound book resembling a photo album; this format evolved after 1948 into single vinyl long-playing (LP) records played at 33+1⁄3 rpm.
An audiobook is a recording of a book or other work being read out loud. A reading of the complete text is described as "unabridged", while readings of shorter versions are abridgements.
Covermount is the name given to storage media or other products packaged as part of a magazine or newspaper. The name comes from the method of packaging; the media or product is placed in a transparent plastic sleeve and mounted on the cover of the magazine with adhesive tape or glue.
Sound recording and reproduction is the electrical, mechanical, electronic, or digital inscription and re-creation of sound waves, such as spoken voice, singing, instrumental music, or sound effects. The two main classes of sound recording technology are analog recording and digital recording.
Digital accessible information system (DAISY) is a technical standard for digital audiobooks, periodicals, and computerized text. DAISY is designed to be a complete audio substitute for print material and is specifically designed for use by people with "print disabilities", including blindness, impaired vision, and dyslexia. Based on the MP3 and XML formats, the DAISY format has advanced features in addition to those of a traditional audio book. Users can search, place bookmarks, precisely navigate line by line, and regulate the speaking speed without distortion. DAISY also provides aurally accessible tables, references, and additional information. As a result, DAISY allows visually impaired listeners to navigate something as complex as an encyclopedia or textbook, otherwise impossible using conventional audio recordings.
The Books for the Blind Program is an initiative of the United States National Library Service for the Blind and Physically Handicapped (NLS) which provides audio recordings of books free of charge to people who are blind or visually impaired. The program has included audio recordings of books since 1934 and digital book efforts began in 1996.
The LP is an analog sound storage medium, a phonograph record format characterized by: a speed of 33+1⁄3 rpm; a 12- or 10-inch diameter; use of the "microgroove" groove specification; and a vinyl composition disk. Introduced by Columbia in 1948, it was soon adopted as a new standard by the entire record industry. Apart from a few relatively minor refinements and the important later addition of stereophonic sound, it remained the standard format for record albums until its gradual replacement from the 1980s to the early 2000s, first by cassettes, then by compact discs, and finally by digital music distribution.
A dictation machine is a sound recording device most commonly used to record speech for playback or to be typed into print. It includes digital voice recorders and tape recorder.
A transcription service is a business service that converts speech into a written or electronic text document. Transcription services are often provided for business, legal, or medical purposes. The most common type of transcription is from a spoken-language source into text such as a computer file suitable for printing as a document such as a report. Common examples are the proceedings of a court hearing such as a criminal trial or a physician's recorded voice notes. Some transcription businesses can send staff to events, speeches, or seminars, who then convert the spoken content into text. Some companies also accept recorded speech, either on cassette, CD, VHS, or as sound files. For a transcription service, various individuals and organizations have different rates and methods of pricing. That can be per line, per word, per minute, or per hour, which differs from individual to individual and industry to industry. Transcription companies primarily serve private law firms, local, state and federal government agencies and courts, trade associations, meeting planners, and nonprofits.
Mitra Jyothi established in 1990, is a charitable trust registered under Indian Trust Act based in Bangalore. Its aims to support the visually impaired through various programs it offers. These programs include Talking Book Library, Computer Training Center, Independent Living Skills, Braille Transcription Center and Job Placement. It received State Award in 2010 from the Directorate of Disabled Welfare and Senior Citizens, Government of Karnataka for its exemplary service for persons with disabilities. Mitra Jyothi is also a member of the DAISY Forum of India (DFI). DFI is a forum of Not for profit organizations from India who are involved in production of books and reading materials in accessible formats for persons who cannot read normal print.
The Minnesota Radio Talking Book Network was the world's first radio reading service for the blind; the first on-air date was January 2, 1969. The purpose of a radio reading service is to make current print material available, through the medium of a radio, to those who cannot read it because of a physical condition such as blindness, visual disability, dyslexia, or strokes. In 1969, there were no other options available to blind and visually impaired people.
The West German Audio Book Library for the Blind, abbreviated WBH, is a specialist library which produces and distributes audiobooks and periodicals for blind and partially sighted persons. It is the largest library of its kind in the German speaking world. The WBH supplies a nationwide network of libraries for the visually impaired, primarily in the western German states of North Rhine-Westphalia, Rhineland-Palatinate and the Saarland, but also to other states and abroad.
Recorded Books is an audiobook imprint of RBMedia, a publishing company with operations in countries globally. Recorded Books was formerly an independent audiobook company before being purchased and re-organized under RBMedia, where it is now an imprint. Recorded Books was founded in 1978 by Henry Trentman, one of the pioneers in the audiobook industry.
