Magnetic reproducing system for a digital signal

DETAILED DESCRIPTION OF THE DRAWINGS FIG.
1 is a system block diagram showing an example of a signal recording system for a magnetic tape which is to be reproduced by a magnetic reproducing system for a digital signal according to the present invention; FIG.
2 is a circuit diagram showing an example of a constant current amplifier in the signal recording system shown in FIG.
1; FIG.
3 is an enlarged partial perspective view showing a magnetic head used in the magnetic reproducing system according to the present invention; FIG.
4 is a diagram showing an example of a track pattern on a magnetic tape reproduced by the magnetic reproducing system according to the present invention; FIG.
5 is a system block diagram showing an embodiment of the magnetic reproducing system for a digital signal according to the present invention; FIG.
6 is a circuit diagram showing an embodiment of a crosstalk cancelling circuit in the block system shown in FIG.
5; FIG.
7 is a concrete circuit diagram showing a first embodiment of a signal detection circuit in the block system shown in FIG.
5; FIGS.
8(A) through 8(J) respectively are time charts for explaining the operation of the circuit shown in FIG.
7; FIG.
9 is a system block diagram showing a second embodiment of the signal detection circuit in the block system shown in FIG.
5; FIG.
10 is a graph showing an example of a crosstalk characteristic of the magnetic reproducing system according to the present invention; FIG.
11 is a concrete circuit diagram showing a third embodiment of the signal detection circuit shown in FIG.
5; FIGS.
12(A) through 12(H) respectively are time charts for explaining the operation of the circuit shown in FIG.
11; FIG.
13 is an actual circuit diagram showing a fourth embodiment of the signal detection circuit shown in FIG.
5; and FIG.
14 is a graph showing an example of a relationship between the input signal level of the circuits shown in FIGS.
11 and 13 and the code error factor.
DETAILED DESCRIPTION In FIG.
1, n (n is a natural number) input terminals 111 through 11n are respectively supplied with a divided two-valued code (sign) digital signal which is obtained by subjecting an audio signal of a plurality of channels to pulse-code-modulation (PCM), for example