Portable CD player
Compact disks (CDs) are storage devices for audio signals encoded as digital data. Compact disks are capable of storing more data than cassette tapes and are less susceptible to degradation resulting from repeated use. In addition, Compact disks allow the user to jump quickly and automatically to different tracks of data, unlike cassette tapes, which require a magnetic tape to be physically spooled to the desired location, and typically do not contain indexing information to indicate where new tracks begin. Audio CD players convert the CD digital data to analog data, which are directly reproducible as audio signals. A typical CD player includes a laser light beam which scans a rotating disc having audio signals recorded thereon in the form of "pits" and "lands" disposed in concentric, circular tracks. The sensing of these signals by a light beam obviates any contact between a pickup stylus and the "pits" and "lands", thereby avoiding deterioration of the quality of the recorded signals even when the disc is played several times. A CD player may include a spindle servo, a digital signal processor, and a digital-analog converter (DAC), and a system for reproducing audio data. The information stored on a CD is accessed by rotating the CD under a laser beam. The laser is used to read the bits encoded on the CD. The CD player is provided with an instrument body to be mounted on the instrument panel, an opening for inserting the recording medium opened to the instrument body, a conveying unit, clamp playback mechanism, locking member, and so on. Portable audio players allow a user to listen to audio data in virtually any setting by freeing the user from the mobility constraints imposed by bulky home-based stereo systems. A portable CD player may include a controller for preventing a shock to the CD-DA format player and a buffer memory. Therefore, an external shock and data loss due to vibration can be prevented in the portable CD player system. Because portable CD players are often used in manner that makes connection to an external power supply impractical, portable CD players typically rely on batteries to provide power.
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