JPS63290474A - Signal recorder - Google Patents

Abstract

PURPOSE:To decrease the consumption quantity of tape by providing a signal recorder which allows the phases of signals to be recorded at the starting point of a track to coincide therewith, and which does not need overlapped recording. CONSTITUTION:When a digital data is inputted, it is written in a memory 10. Also, a signal in synchronism with the digital data is inputted to a drum servo 12 as a reference to control a cylinder at a certain rotary phase. A PG signal representing this rotary phase is inputted to a control signal generator 13, where a control signal to read such a data as recorded first on a track from the memory 10 is generated. A data thus read out is converted to a signal to be recorded on a tape by the recording circuit 11, and recorded on the tape through respective heads. As a result, always, the first data is recorded at the beginning of a track, hence there is no need for overlapped recording, and the tape consumption quantity can be reduced as well as a high density recording is made possible.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a signal recording device for recording video signals on a magnetic tape using a rotating head.

2. Description of the Related Art FIG. 3 shows a block diagram of a signal recording device in a conventional VTR. 30 is a recording system circuit that converts an analog signal into a signal to be recorded on a tape through the head; 31 is a drum servo that controls the rotational phase of a drum cylinder having the head;

In the signal recording device configured as described above, when an analog signal synchronized with the reference signal input to the drum servo 31 is input to the recording system circuit 30, it is converted into a signal to be recorded on the tape, and is recorded on the tape through the head. recorded. The operating waveform diagram is shown in FIG. However, when some kind of disturbance is applied during recording on a VTR, the rotational phase of the instantaneous cylinder changes. Then, as shown in FIG. 4, a time lag occurs between the rotational phase of the cylinder and the phase of the recorded signal, and a signal having a phase different from that of other tracks is recorded in that track. Therefore, as a method of compensating for this deviation, as shown in FIG. 5, there is overlap recording in which the signals of the previous track and the next track are recorded in a superimposed manner within one track on the tape. Then, as shown in FIG. 6, even if there was a phase shift in the recorded signals, the signals to be recorded would always fall within one track due to overlap recording.

Problems to be Solved by the Invention However, with the above configuration, the phases of the recorded signals at the beginning of the track no longer match, and an extra portion for the overlap must be recorded, resulting in a large amount of tape consumption. Therefore, it is not suitable for high-density recording. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a signal recording device that matches the phase of recorded signals at the beginning of a track and does not require overlapping recording.

Means for Solving the Problems The present invention provides a storage means for writing video signal data into a memory, a recording means for converting data from the memory of the storage means into a signal to be recorded on a tape through a head, and A drum cylinder control means for controlling a drum cylinder having a head; and a memory control means for generating a control signal for reading data from the memory of the storage means from a PG signal for detecting the rotational phase of the head in the drum cylinder control means. The signal recording apparatus is characterized in that reading of data recorded from the beginning of a track from the storage means is controlled by a PG signal of the drum cylinder control means.

Operation According to the present invention, when video signal data is inputted with the above-described configuration, it is first written into a memory which is a storage means. Further, the cylinder having the head is controlled at a certain rotational phase by a drum cylinder control means. Therefore, a PC signal representing this rotational phase is input to the memory control means, and is converted into a control signal for reading out data to be recorded first in the track from the memory, which is the storage means, and the read data is transmitted to the recording means. The data passes through a recording system circuit and is recorded on the tape through the head. As a result, even if a disturbance is applied to the cylinder and the phase changes, the first data reading from the memory will also change accordingly, so the phase of the recorded signal within the track will not change, and the phase at the beginning of the track will also change. Match other tracks. Moreover, this eliminates the need for overlapping recording, reduces tape consumption, and enables recording at high density.

Example Hereinafter, the present invention will be explained in more detail based on the drawings.

FIG. 1 shows an overall block diagram of an embodiment of the present invention, and FIG. 2 shows its operating waveform diagram. In Figure 1,
1Q is a memory that is a storage means for writing digital data; 11 is a recording system circuit that is a recording means that converts data from the memory 10 into a signal to be recorded on a tape; 1
2 is a drum servo which is a drum cylinder control means that controls the rotational phase of the drum cylinder using a signal synchronized with the digital data inputted to the memory 1o as a reference signal; 13 is a comparison signal of the drum servo 12 which controls the rotation of the cylinder. This is a control signal c generator which is a memory control means that generates a control signal for reading data to be recorded first in a track from the memory 10 based on a PG signal representing a phase. The operation of the signal recording device of this embodiment configured as described above will be explained below. First, when digital data is input, it is written into the memory 10. A signal synchronized with the digital data is also input to the drum servo 12 as a reference signal to control the cylinder at a certain rotational phase. Therefore, the PG signal representing the rotational phase is input to the control signal generator 13 to generate a control signal for reading out the data to be recorded in the track from the memo IJ 10. The system circuit 11 converts the signal into a signal to be recorded on the tape, and the signal is recorded on the tape through each head. As described above, according to this embodiment, since reading of the first data of the memo I710 is controlled by the PG signal representing the rotational phase of the cylinder as shown in the waveform diagram of FIG. The beginning of the track is always the first data, and the phase always matches that of other tracks. Moreover, as a result, there is no need for overlapping recording, and tape consumption can be reduced. Also, since the phase of the recorded signal at the beginning of the track is the same on all trunks, for example, when recording digital data, it is possible to record only a certain part of the track, and even in such a case, Since the position of that part is determined, it can be realized with a simple circuit configuration. According to this embodiment, it is applied to a signal recording device that records digital data on a tape with a rotary head, and in the block diagram of FIG.
By adding a D converter and later a zero converter, it is also possible to create a signal recording device that records analog signals on tape with a rotating head.

As described in detail, according to the present invention, the initial reading of data from the memory also varies in accordance with the variation in the rotational phase of the cylinder. Therefore, there is no phase shift in the signals recorded on the track due to fluctuations in the rotational phase of the cylinder, and the beginning of the track is always the first data. As a result, there is no need for overlapping recording, and tape consumption is reduced, making it possible to achieve high-density recording, which has great practical effects.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a signal recording device according to an embodiment of the present invention, FIG. 2 is an operation waveform diagram of the same embodiment, FIG. 3 is a block diagram of a conventional signal recording device, and FIGS. 4 and 5 is an operating waveform diagram. 10...Memory, 11...Recording circuit, 12...Drum servo, 13...Control word generator, 3゜...... Recording circuit, 31...
...Drum servo.

Claims (1)

[Claims] a storage means for writing video signal data into memory;
a recording means for converting data from the memory of the storage means into a signal to be recorded on the tape through the head; a drum cylinder control means for controlling a drum cylinder having the head; and a rotational phase of the head in the drum cylinder control means. and a memory control means for generating a control signal for reading data from the memory of the storage means from a PG signal for detecting the PG, and the storage means for storing data to be recorded from the beginning in a track based on the PG signal of the drum cylinder control means. A signal recording device characterized by controlling readout from.