Tape Speed Servo Control for Portable DCC

In developing a portable DCC (digital compact cassette) system, electrical and mechanical improvements were introduced in order to enhance resistance to shock and to rolling, while preserving portability and light weight. The control frequency range of the motor was widened, mainly through the use of a newly developed motor and servo processor, to enhance resistance to rolling and enable stable tape transport. Furthermore, stepped control of the motor rotation speed was adopted to ensure the detection of control signals recorded on the tape in tape search mode, including signals to increase or decrease tape speed.