Abstract: Method and apparatus for controlling tape movement to a given position by utilizing the combination of periodic determinations of tape position by calculation based on reel speed ratios, and monitoring positions represented by counts in a pulse count memory.

Abstract: Method and apparatus for synchronizing a display with tape movement utilizing a clock means for driving the display, and adjusting the rate of the clock means according to measured movement of the tape to maintain the clock and thus the display in synchronization.

Abstract: Method and apparatus for identifying a cassette inserted in a tape deck apparatus by using constants stored in memory corresponding to known types of cassettes; controlling the drive means of the apparatus to carry out a cassette identification sequence involving moving the tape to different positions and comparing actual positions to theoretical positions based on the use of a pre-selected set of constants, and selecting the correct set of constants identifying the cassette in the apparatus according to the comparison.

Abstract: Method and apparatus for monitoring movement of tape in tape transport apparatus for reel/tape assemblies such as cassettes, using tape position determination algorithms for determining absolute values of tape position as tape is driven from reel to reel using numerical constants stored in memory and periodically measured reel rotational speed ratios. The apparatus incorporates a microprocessor based controller having a CPU and program memory unit storing programs operating the CPU under program control to make the position determinations based on inputs from pulse generators representing reel rotational speeds and numerical constants corresponding to each of a plurality of known types of cassettes, which constants are derived for the one of the known types of cassettes loaded in the apparatus.