A test CD is a
compact disc
The compact disc (CD) is a Digital media, digital optical disc data storage format co-developed by Philips and Sony to store and play digital audio recordings. It employs the Compact Disc Digital Audio (CD-DA) standard and was capable of hol ...
containing tracks of
music
Music is the arrangement of sound to create some combination of Musical form, form, harmony, melody, rhythm, or otherwise Musical expression, expressive content. Music is generally agreed to be a cultural universal that is present in all hum ...
al and technical
test
Test(s), testing, or TEST may refer to:
* Test (assessment), an educational assessment intended to measure the respondents' knowledge or other abilities
Arts and entertainment
* ''Test'' (2013 film), an American film
* ''Test'' (2014 film) ...
s and demonstrations. Most of the tracks are made of
electronic signals and pure
frequencies
Frequency is the number of occurrences of a repeating event per unit of time. Frequency is an important parameter used in science and engineering to specify the rate of oscillatory and vibratory phenomena, such as mechanical vibrations, audio ...
. The purpose of these specialized compact discs is to make accurate tests and calibrate
audio equipment
Audio equipment refers to devices that reproduce, record, or process sound. This includes microphones, radio receivers, AV receivers, CD players, tape recorders, amplifiers, mixing consoles, effects units, headphones, and speakers.
Audio equip ...
.
Releases
A wide variety of
CD-DA
Compact Disc Digital Audio (CDDA or CD-DA), also known as Digital Audio Compact Disc or simply as Audio CD, is the standardization, standard format for audio compact discs. The standard is defined in the ''Rainbow Books, Red Book'' technical s ...
test discs have been produced in the past, and a few are still in production:
* Stereophile Test CD 2
* CD-CHECK Test Disc
* NAB Broadcast & Audio Test CD, Vol 1 (still in production)
* NAB Broadcast & Audio Test CD, Vol 2 (still in production)
* Precision Test Signals
* The Ultimate Test CD
* CBS Records CD-1 Standard Test Disc (with EIA standard signals)
* EIAJ CD-1 Standard Test Disc (YGDS 13) (EIAJ Standard CP-308)
* Denon Audio Technical CD 38C39-7147
* Japan Audio Society Audio Test CD-1 (YDDS-2)
* Philips Test Sample 4a
* Sony Test CD Type 3 YEDS-7
* Technics CD Test Disc SH-CD001
See also
*
Audio equipment testing
*
Super Audio CD
Super Audio CD (SACD) is an optical disc format for audio storage introduced in 1999. It was developed jointly by Sony and Philips Electronics and intended to be the successor to the compact disc (CD) format.
The SACD format allows multiple a ...
References
Compact disc
Audio electronics
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