"In the apparatus, if the manual mode is set, the bit rate can be finely adjusted. [0113] Further, in the above explanation, ???, x are indicated as a form of display of the remaining amount calculation result, but the above display form is not limitative, YES, NO can be used and a display of OK, NG may be made. [0114] In FIG. 7, the processing procedure in the microcomputer block 30 in a case wher" . . . .