Patent ID: 7061705

Claim:
A signal processing apparatus which performs recording or reproduction of information on or from a recording medium which is constituted by a tape, a supply side reel which supplies said tape, and a take-up side reel which takes up said tape supplied from said supply side reel thereon, characterized by comprising: first calculation means for calculating, on the basis of a rotation period of said supply side reel or said take-up side reel, a first length of said tape wound on said supply side reel and a second length of said tape wound on said take-up side reel; acquisition means for acquiring a total length of said tape from a memory section built in said recording medium; and second calculation means for correcting said first length or said second length by using the total length of said tape, and calculating a remaining amount of said tape that is recordable or reproducible, and characterized in that: said second calculation means multiplies said first length or said second length by a value gotten by dividing the total length of said tape by a sum of said first length and said second length, and obtains a resultant value as the remaining amount of said tape.