Signal recording and reproducing device for transmitting and receiving data

#This invention relates to a signal recording device for transmitting recording data signals via a rotary transformer to a rotary drum having a rotary head for recording data.

#In a video tape recorder (VTR) in which a recording medium such as a magnetic tape is used and data is recorded thereon by a rotary head provided on the rotary drum, recording signals are exchanged by a rotary transformer connected between a rotor side, that is a rotor drum side, and a stator side, that is a stator side.

#FIG. 1 shows a schematic arrangement of an analog VTR. Referring to FIG. 1, the analog VTR has a simplified construction in which a recording head 40 has its winding directly connected to a winding of a rotary transformer 38, while a playback head 41 has its winding directly connected to a winding of a rotary transformer 39, and a recording amplifier 34 and a playback amplifier 35 are arranged on the stator side.

#FIG. 1 is a schematic view showing an arrangement of a conventional analog VTR.

#FIG. 2 shows a data format of a conventional MPX signal.

#FIG. 3 is a schematic view showing an arrangement of a digital signal recording/reproducing apparatus employing a signal recording device according to the present invention.

#Referring to the drawings, preferred embodiments of the present invention will be explained in detail. FIG. 3 shows a schematic arrangement of a digital signal recording/reproducing apparatus employing a signal recording device according to the present invention. Specifically, the digital signal recording/reproducing apparatus is a digital VTR having a data rate per channel of 110 Mbps, with the maximum fundamental frequency of the data signals being 55 MHz.

#A magnetic tape, as a recording medium, not shown, is wrapped 180.degree. around a rotary drum, not shown. For data recording, recording signals of the same channel are recorded by two recording heads arranged in diametrically opposite positions to each other. For data reproduction, signals are reproduced by two playback heads arranged at diametrically opposite positions to each other, as in the case of the recording heads. The symbols affixed to the recording heads and reproducing heads of FIG. 3 denote the combinational correspondence between the recording heads and the playback heads. Specifically, recording signals recorded by the recording head R1A are reproduced by a playback head PB1A, with the recording head R1A facing a recording head R2A. If the head pair facing each other constitutes one channel, there are a sum total of four channels A, B, C and D, so that the recording data rate of the digital VTR of the illustrated embodiment is 440 Mbps. On the other hand, the rpm of the rotary drum is 120, with the time taken per recording track being 4.167 ms.

#FIG. 4 shows the signal output timing of the four channels of the recording heads and the playback heads and two erasure heads. The two erasure heads Er1, Er2 sequentially record signals on a magnetic tape at a timing shown in FIG. 4A. During data recording, paired recording heads R1A, R2A; R1B, R2B; R1C, R2C; and R1D, R2D of four channels A, B, C and D sequentially record signals at timings shown in FIGS. 4B, 4C, 4D, and 4E. During data reproduction, paired playback heads PB1A, PB1B; PB1B, PB2B; PB1C, PB2C; and PB1D, PB2D of four channels associated with the recording heads of the four channels sequentially reproduce signals from the magnetic tape at timings shown in FIGS. 4F, 4G, 4H and 4I, respectively.