Abstract: A signal converter for use in a recording or displaying device which can be used to change the size of characters to be recorded or displayed. By using instruction signals or enlargement codes, a part (for example the upper or lower half) of a character field and hence a corresponding part of a character may be enlarged, and then the enlarged upper and lower halves are combined to form an enlarged character for recording or display. Any number of characters in a row of characters may be changed in size by using the signal converter, and specified portions of different characters may be enlarged and then combined.