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In a CD recorder a basic distinction must be made between the recording and playback paths (Figure 10). The playback path corresponds to that in a conventional CD player. Digital information is transmitted from the read-out unit (laser, optics and mechanism) to the decoder where decoding, and, if necessary, error correction are performed. Information for the user is delivered to the display by a microprocessor. The audio signal is either passed on to an amplifier circuit after conversion in the digital-to-analog converter (DAC) or is fed to the digital output.
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The recording pathway is new to the CD medium. Analog signals are converted into digital data in the analog-to-digital converter (ADC), coded in the encoder and are then stored on a CD-R disc. The digital input by-passes the A/D converter and permits recordings to be made from the digital output of other CD players.
The third function block is the CDR mechanism. This is also new and has a higher power
laser than in conventional CD players. Of course this mechanism must be capable of very
precise tracking, particularly during the recording. The CDR electronics therefore also
decode data from the preformed track and control the speed of rotation of the disc. 
Page 1: Introduction to Compact Disc Recording.
Previous Page Page 3, The Recording Process: The preformed tracks and setting the laser power.
Page 2: The CD-R Disc: What's different from a "conventional" CD, before, during and after recording.