Audio CDs and audio CD players have been commercially available since October 1982.

Written CD-Rs and CD-RWs are, from a technical standpoint, fully compatible with the Audio CD ( Red Book ) and CD-ROM ( Yellow Book ) standards, although some hardware compatible with Red Book CDs may have difficulty reading CD-Rs and especially CD-RWs.

However, the sound quality falls short of the standards common with SACDs ( Super Audio CD ) and also that of audiophile CDs from companies such as Mobile Fidelity Sound Lab.

The system can also play Audio CDs.

The first Philips CD-i player, released in 1991 and initially priced around USD $ 700, is capable of playing interactive CD-i discs, Audio CDs, CD + G ( CD + Graphics ), Karaoke CDs, and Video CDs ( VCDs ), though the last requires an optional " Digital Video Card " to provide MPEG-1 decoding.

Audio CDs do not use WAV as their sound format, using instead Red Book audio.

Red Book is the standard for audio CDs ( Compact Disc Digital Audio system, CDDA or CD-DA ).

* CDs, Audio cassettes, DVDs, and videos ( including video rentals )

Audio drama, whether newly produced or OTR classics, can be found on CDs, cassette tapes, podcasts, webcasts and conventional broadcast radio.

It ( and its later versions such as the PCM-1610 and 1630 ) was widely used for the production and mastering of some of the first Digital Audio CDs in the early 1980s.

Other examples include dbx, Inc .' s Model 700 system, which, similar to modern Super Audio CDs, used a high sample-rate delta-sigma modulation rather than PCM ; Decca's 1970s PCM system, which used a videotape recorder manufactured by IVC for a transport ; and Mitsubishi's X-80 digital recorder, a 6. 4 mm ( ¼ in ) open reel digital mastering format that used a very unusual sampling rate of 50. 4 kHz.

Audiophiles play music from a wide variety of sources including phonograph records, compact discs ( CDs ), and digital audio file formats that are uncompressed as well as ones that are compressed using lossless data compression such as FLAC, Windows Media Audio 9 Lossless and Apple Lossless ( ALAC ).

Pristine Audio has released two CDs of Herrmann's radio broadcasts.

Uncompressed media ( such as on Laserdiscs, Audio CDs, and WAV files ) or losslessly compressed media ( such as FLAC or PNG ) do not suffer from compression artifacts.

Audio recordings for self-study use many of the methods used in classroom teaching, and have been produced on records, tapes, CDs, DVDs and websites.

* Evaluating New Copy-Prevention Techniques for Audio CDs

* Pit Signal Processing, a copy protection measure used on Super Audio CDs

* Support for ripping Audio CDs as well as transcoding all supported audio formats using the Converter component.

* Ripping Audio CDs, Video CDs, Video DVDs

** Copy Audio CDs

** Copy Enhanced Audio CDs ( CD-Extra )

* Audio: 500 Hz, 1 kHz, and 1. 5 kHz tones ( can be modulated quickly to produce different tones )

* A multiple Sequencer which can mix MIDI tracks with Digital Audio ;

When the music is stored in an audio file format that is lossless such as FLAC, Monkey's Audio or WMA Lossless, the computer playback of recorded audio can serve as an audiophile-quality source for a hi-fi system.

* Audio can often be compressed at 10: 1 with imperceptible loss of quality

Audio effects units that are frequently used in stage and recording, such as reverbs, delays and choruses, can be remotely adjusted via MIDI signals.

* Audio: 3 square wave generators, 1 noise generator, the system has a mono speaker, but stereo sound can be had via headphone output

Audio can be propagated by modulated ultrasound.

Audio can be ripped using error correction and ripped audio can be protected with Windows Media DRM.

Audio can be stored in either of two forms: 16-bit Linear PCM stereo at 48 kHz sampling rate ( 768 kbit / s per channel, 1. 5 Mbit / s stereo ), or four nonlinear 12-bit PCM channels at 32 kHz sampling rate ( 384 kbit / s per channel, 1. 5 MBit / s for four channels ).

DIF blocks are the basic units of DV streams and can be stored as computer files in raw form or wrapped in such file formats as Audio Video Interleave ( AVI ), QuickTime ( QT ) and Material Exchange Format ( MXF ).

DV Audio / Video data can be stored as raw DV data stream file ( data is written to a file as the data is received over FireWire, file extensions are. dv and. dif ) or the DV data can be packed into container files ( ex: Microsoft AVI, Apple MOV ).

Audio quality differences between CD audio and MP3 can be noticeable.

Miniature binaural " in-ear " or " near-ear " microphones can be linked to a portable Digital Audio Tape ( DAT ) or MiniDisc recorder, bypassing the need for a dummy head by using the recordist's own head.

The term MP2 and filename extension < tt >. mp2 </ tt > usually refer MPEG-1 Audio Layer II data, but can also refer to MPEG-2 Audio Layer II, a mostly backwards compatible extension which adds support for multichannel audio variable bit rate encoding, and additional sampling rates, defined in ISO / IEC 13818-3.

A digital recording ( such as a CD ) encoded to the Monkey's Audio format can be decompressed into an identical copy of the original audio data.

Because Monkey's Audio is relatively slow when encoding or decoding files ( what FLAC accomplishes in several seconds can take a minute or more with Monkey's Audio ) FLAC has largely eclipsed it as the preferred format for commercial distribution of lossless audio.

Monkey's Audio files can be encoded and decoded on any platform which has a J2SE implementation, by the means of the unofficial JMAC library, which is Free software licensed under the GNU LGPL.

Audio broadcasting also can be done via cable radio, local wire television networks, satellite radio, and internet radio via streaming media on the Internet.

Audio broadcasting ( be it for television or audio broadcasting ) is perhaps the biggest market segment ( and user area ) for audio processing products — globally.

Audio and video encoded with many codecs might be put into an AVI container, although AVI is not an ISO standard.

The dye materials developed by Taiyo Yuden made it possible for CD-R discs to be compatible with Audio CD and CD-ROM discs.

Audio equipment must be able to reproduce frequencies high enough and low enough to be realistic.

MPEG-3 is not to be confused with MP3, which is MPEG-1 Audio Layer III.

Audio may be output using two methods.

* Steganophony-the concealment of messages in Voice-over-IP conversations, e. g. the employment of delayed or corrupted packets that would normally be ignored by the receiver ( this method is called LACK-Lost Audio Packets Steganography ), or, alternatively, hiding information in unused header fields.

The film itself has been widely sampled: Punk band Big Audio Dynamite used an audio clip from the movie in its song " Medicine Show "; the audio was taken from the scene in which a judge, after reading a long list of criminal charges, sentences Tuco to be " hanged from the neck until dead.

The user interface ( UI ) for Audio Compression Manager may be accessed through various programs that use it, including Sound Recorder in some versions of Windows.

To record WAV files to an Audio CD the file headers must be stripped and the remaining PCM data written directly to the disc as individual tracks with zero-padding added to match the CD's sector size.

Frequencies up to 100 kHz may sometimes be classified as Audio.

Sony had originally intended for Digital Audio Tape ( DAT ) to be the dominant home digital audio recording format, replacing the analog cassette.

Audio cannot be recorded on a VHS tape without recording a video signal, even in the audio dubbing mode.