Analysis of information sources in references of the Wikipedia article "Compact Disc Digital Audio" in English language version.
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The Nyquist rate is twice the bandwidth of the signal ... The Nyquist frequency or folding frequency is half the sampling rate and corresponds to the highest frequency which a sampled data system can reproduce without error.
The first test CD was Richard Strauss's Eine Alpensinfonie, and the first CD actually pressed at a factory was ABBA's The Visitors, but that disc wasn't released commercially until later.
{{citation}}: CS1 maint: numeric names: authors list (link)This Rykodisc release was the first compact disc to contain 80 minutes of music; 78 minutes had previously been the longest length possible to encode on a CD.
{{cite web}}: CS1 maint: deprecated archival service (link){{cite web}}: CS1 maint: deprecated archival service (link){{cite news}}: CS1 maint: deprecated archival service (link)An international collaboration between Philips and the Sony Corporation lead to the creation of the compact disc. The author explains how it came about
An added feature of audio CD's is that in the event of damage, the missing data can be interpolated; that is to say, the information follows a predictable pattern that allows the missing value to be guessed at. So if an audio CD is damaged by dirt or a scratch, the missing data can be averaged from a pattern with no noticeable difference to the listener. This is something the next technology in optical digital memory, CD-ROM, cannot do because an executable program's data doesn't follow a natural law. An interpolation-based guess isn't just slightly different; it's completely wrong. Because of this precision, CD-ROM drives for PC's came later and much more expensive than audio.
The first test CD was Richard Strauss's Eine Alpensinfonie, and the first CD actually pressed at a factory was ABBA's The Visitors, but that disc wasn't released commercially until later.
The Nyquist rate is twice the bandwidth of the signal ... The Nyquist frequency or folding frequency is half the sampling rate and corresponds to the highest frequency which a sampled data system can reproduce without error.
The frequency response of the system is absolutely flat from 20 Hz to 20,000 Hz. The digital sampling-frequency is 44.1 kHz, which would theoretically give a response up to 22.05 kHz. Some margin, though, is left for high frequency cut-off filtering.
This Rykodisc release was the first compact disc to contain 80 minutes of music; 78 minutes had previously been the longest length possible to encode on a CD.
An added feature of audio CD's is that in the event of damage, the missing data can be interpolated; that is to say, the information follows a predictable pattern that allows the missing value to be guessed at. So if an audio CD is damaged by dirt or a scratch, the missing data can be averaged from a pattern with no noticeable difference to the listener. This is something the next technology in optical digital memory, CD-ROM, cannot do because an executable program's data doesn't follow a natural law. An interpolation-based guess isn't just slightly different; it's completely wrong. Because of this precision, CD-ROM drives for PC's came later and much more expensive than audio.
The frequency response of the system is absolutely flat from 20 Hz to 20,000 Hz. The digital sampling-frequency is 44.1 kHz, which would theoretically give a response up to 22.05 kHz. Some margin, though, is left for high frequency cut-off filtering.
The frequency response of the system is absolutely flat from 20 Hz to 20,000 Hz. The digital sampling-frequency is 44.1 kHz, which would theoretically give a response up to 22.05 kHz. Some margin, though, is left for high frequency cut-off filtering.