Abstract: A magnetic recorder and/or reproducer is provided for preventing a crosstalk phenomenon from occurring between adjacent tracks by a "wide head" during "long time" record mode. The magnetic recorder and/or reproducer includes a rotation drum which has a pair of first heads for recording and/or reproducing during a standard record mode and a pair of second heads for recording and/or reproducing during a long time record mode. The rotation drum also has a pair of flying erase heads whose head width is greater than or equal to the standard record track width of a standard record mode. The pair of flying erase heads is separated from the bottom surfaces of the pair of first heads by a first offset and is separated from the bottom surfaces of the pair of second heads by a second offset. Furthermore, one of the flying erase heads forms a predetermined angle with one of the first heads.

Abstract: A modulation circuit for a digital signal recorder includes first and second high-pass filters for removing the direct current component in the output of the coded I and Q channels and for converting a 4-levels signal into a 7-levels signal. Additionally, a carrier signal generator for generating a carrier signal, a modulator for performing quadrature amplitude and phase modulations on the outputs of first and second high-pass filters using the carrier signal, a pilot signal generator for generating a pilot signal and combining the pilot signal with the output of modulator and for outputting the result for transmission or recording are also provided.