JPH01201871A - Signal recording and reproducing device - Google Patents

Abstract

PURPOSE:To improve the synchronous reproduction by writing the phase difference of first and second frame synchronizing signals in the form of offset, and controlling the phase of the first frame synchronizing signal at a second frequency conversion part corresponding to a phase difference offset at the time of reproduction. CONSTITUTION:A first recording time code is corrected by a first reference phase difference, and is sampled at every second frame synchronization, then, it is written on a signal recording and reproducing part 6. At this time, the phase difference offset found at a phase difference offset arithmetic part 4 from the phase difference of the second frame synchronizing signal and the first frame synchronizing signal detected at a phase difference detecting part 2, and the reference phase difference corresponding to a recording time code obtained from a first phase difference arithmetic part 3 is also written simultaneously. At the time of reproduction, a signal unifying the phase differences of the second and first frame synchronizing signals at a phase control signal generating part 8 from the phase difference by a second phase difference arithmetic part 7 and the offset of the reproducing part 6 is generated. Thus, it is possible to perform the synchronous reproduction with high accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a rotary head type digital audio tape recorder (hereinafter referred to as R-DA) for synchronizing a signal recording and reproducing device with a signal recording and reproducing device having a different frame period.
This invention relates to a signal recording and reproducing apparatus for recording and reproducing data in synchronization with a VTR using a signal recording and reproducing means (abbreviated as T) as a signal recording and reproducing means.

BACKGROUND OF THE INVENTION In recent years, in response to the increasing image quality of VTRs, there has been an increasing demand for audio tape recorders with higher sound quality. R-DAT can be considered as a high-quality recording device to replace conventional analog recording, but the challenge is synchronous recording and synchronous playback of video and audio.

Conventionally, when operating VTRs in synchronization, time codes were simultaneously recorded to specify absolute addresses on the tape, and during playback, the time codes of both VTRs were compared and the tape running of the VTRs was controlled so that the two matched. A method is being adopted. In order to do the same thing when the VTR and R-DAT operate in synchronization, it is necessary to record the same time code as the VTR's time code on the R-DAT.
A signal recording and reproducing apparatus can be considered that synchronizes both during reproduction by recording the time code of the VTR in the subcode area of T. For example, Raga Deck (ROGERL)
AGADEC) Mr. Kjru October 1987 83rd Nie Yi Fist Nis ΦConhenshoy (A):S C0N
VENTION) (7) “R-DAT7” o7 Esssional Audio (PROFESSIONAL AU
See the paper entitled DIO) J.

Hereinafter, an example of the conventional signal recording/reproducing apparatus as described above will be explained with reference to the drawings.

In FIG. 5, the well-known R-DAT serves as a 21f'i signal recording/reproducing section, and 22 is a frequency conversion section.

The operation of the signal recording and reproducing apparatus configured as described above will be explained below.

First, the frequency conversion unit 22 converts the frame synchronization signal output from the VTR into an R-DAT 21 with a different period from the frame synchronization signal output from the VTR.
VTR and R
- Run DAT21 synchronously. When recording, R-DAT
is V sampled at the frame period of R-DAT.
Write the TR time code (SMPTE time code).

During playback, an SMPTE time code is output every time the time code is read from the R-DAT 21 for each frame period. While referring to this time code, check the VTR or R-DAT21 so that both time codes match.
Synchronous operation is performed by controlling the

Problems to be Solved by the Invention However, in the above configuration, VTR and R-DA
Since the phases of the respective frame synchronization signals of T do not match during recording and playback, there is a problem in that the error when comparing time codes becomes large.

Figure 6 is for explaining the first work, where A is the VTR frame synchronization signal during recording, B is the R-DAT frame synchronization signal during recording, C is the VTR frame synchronization signal during playback, D is the frame synchronization signal of R-DAT during reproduction, and the numbers in the figure are the number of frames of time code output in synchronization with the rising edge of each frame synchronization signal. In the state shown in this figure, when the time code is compared with the frame sync signal C at the falling edge of the frame sync signal during playback, the read value of the time code matches, but from the figure As is clear, VTR and R-
The phase relationship between DAT frames differs between recording and reproduction.

That is, when the VTR and the R-DAT are synchronously reproduced, the time relationship between their outputs will not be the same as that during recording, and an error will occur.

In order to solve the above-mentioned problems, the present invention records a time code and a phase difference offset of the frame synchronization signal in a signal recording/reproduction device having different frame synchronization signals. The present invention provides a signal recording and reproducing device that can eliminate phase errors.

Means for Solving the Problems In order to solve the above problems, the signal recording and reproducing device of the present invention includes a signal recording and reproducing means having a first frame period;
This is a signal recording and reproducing device capable of synchronizing operation with a signal recording and reproducing device having a second frame period different from the first frame period, and when recording, the first frame synchronization signal is converted into the second frame synchronization signal. a first frequency conversion means for converting the frame frequency into the first frame synchronization signal; a phase difference detection means for detecting the phase difference between the frames of the first frame synchronization signal and the second frame synchronization signal; a first phase difference calculation means that matches the phase difference between the two frames according to a predetermined rule to obtain a first reference phase difference; a phase difference offset calculation means for calculating a difference from a reference phase difference of 1; a first time code correction means for determining a second recording time code as a unit;
signal recording and reproducing means for recording the second time code obtained by the time code correction means and the phase difference offset calculated by the phase difference offset calculation means;
During reproduction, a second reference phase difference is determined from the second frequency conversion means for converting the second frame frequency to the first frame frequency and the first reproduction time code reproduced from the signal recording and reproduction means. The second phase difference calculation means calculates the second reference phase difference of the second frequency conversion means from the phase difference offset reproduced from the signal recording and reproduction means and the second reference phase difference obtained by the second phase difference calculation means. phase control signal generating means for controlling the phase relationship between the frame frequency of the first frame frequency and the first frame frequency to be the same as the phase relationship during recording; and a second time code correction means for correcting the phase difference and the reproduction phase difference offset to obtain a second reproduction time code in units of the first frame frequency.

Effect The present invention has the above-described configuration, and when a signal recording and reproducing device having a first frame frequency and a signal recording and reproducing device having a second frame frequency different from this are operated synchronously, the signal recording and reproducing device can be operated in synchronization. By controlling the phase of the frame synchronization signal according to the time code read from the means and the phase difference offset, the time relationship between the reproduced data signal of the signal recording and reproducing means and the time code is made the same as that at the time of recording, and the time code is compared. This eliminates time errors and makes it possible to accurately perform synchronized reproduction of signal recording and reproducing apparatuses having first and second frame frequencies.

EXAMPLES Hereinafter, examples of the present invention will be described with reference to the drawings.

FIG. 1 shows a block diagram of a signal recording/reproducing apparatus according to a first embodiment of the present invention. In Figure 1, 1
2 is a first frequency converter that converts a first frame synchronization signal such as VTR to a second frame synchronization signal such as R-DAT, and 2 is a position of the first and second frame synchronization signals. A phase difference detection unit that detects a phase difference, 3 a first phase difference calculation unit that calculates a first reference phase difference from the first recording time code, and 4 a phase difference offset from the first reference phase difference and the detected phase difference. 5 is a first time code correction unit that outputs a second recording time code obtained by correcting the first recording time code by the first reference phase difference in a second frame period; 6 7 is a signal recording/reproducing unit having a second frame frequency for recording and reproducing the second recording time code, recording phase difference offset, and recording data signal sampled by the second frame synchronization signal; 7 is the first reproduction unit; A second phase difference calculating section 8 calculates a second reference phase difference from the time code, and 8 calculates the phases of the first frame synchronization signal and the second frame synchronization signal from the second reference phase difference and the reproduced phase difference offset. A phase control signal generator outputs a phase control signal for determining the relationship; 9 a second frequency converter converts the second frame frequency into the first frame frequency; 1o converts the first reproduction time code into the second frame frequency; This is a second time code correction unit that outputs a second reproduction time code corrected by the reference phase difference and reproduction phase difference offset in the first frame period.

The operation of the signal recording and reproducing apparatus configured as described above will be explained.

In the signal recording and reproducing apparatus of this embodiment, during recording, since the first frame frequency and the second frame frequency, which is the frame frequency of the signal recording and reproducing section 6, are different, the first frame synchronization signal is converted to the frequency converting section. 1 generates a second frame synchronization signal for the signal recording/reproducing section 6, and recording is performed in a state in which both are synchronized. The signal recording and reproducing section 6 uses a first time code correction section 5 to correct the first recording time code in units of the first frame period by the first reference phase difference, and corrects the first recording time code in units of the first frame period, and corrects the first recording time code in each second frame period. Cypling and writing. At this time, the phase difference between the second frame synchronization signal and the corresponding first frame synchronization signal detected by the phase difference detection section 2 and the recording time code determined from the first phase difference calculation section 3 are combined. The phase difference offset calculated by the phase difference offset calculating section 4 from the corresponding reference phase difference is also written.

E, F, G, and H in FIG. 3 are timing charts showing this situation. E, G are first frame synchronization signals, F
, H is the second frame synchronization signal of the signal recording and reproducing section, 0 to 5 are the number of frames of the time code synchronized with the first frame synchronization signal, and a to f are the numbers of frames of the time code synchronized with the first frame synchronization signal and the second frame synchronization signal. This is a first reference phase difference in which the frame synchronization signal is associated with the leading falling edge of the frame synchronization signal of each frame as a reference. In this embodiment, the falling edge of the beginning of the frame is based on the shedge, but other timing synchronized with the frame may be used as the reference. E and G are written with the time axes aligned, and from this figure it can be seen that H lags F by an amount a. This phase difference offset α is written into the signal recording/reproducing section 6 together with the time code for every second frame. The time code to be written is the time code sampled at the timing indicated by the upward arrow in the figure. This process is performed by the first time code correction section 6.

During playback, a second reference phase difference is calculated by the second phase difference calculating section 7 from the time code read out from the signal recording and reproducing section 6, and this second reference phase difference and the time code read from the signal recording and reproducing section 6 are calculated. From the output phase difference offset, the phase control signal generating section 8 generates a phase control signal so as to match the phase difference of the first frame synchronization signal with respect to the second frame synchronization signal, thereby converting the second frequency conversion section. By controlling the phase of 9, the relationship between the reproduction signal and the first frame synchronization signal is made the same as the state at the time of recording.

I, J, and L in FIG. 4 are timing charts showing this situation. I, is the second frame synchronization signal of the signal recording and reproducing section, J and L are the first frame synchronization signals to be output, and 0 to 5 are the frames La of the time code.
/~f' is the second reference phase difference in which the second frame synchronization signal and the first frame synchronization signal are associated according to the same rules as a - f during recording (a' and a are added). (This is the synchronization of the first frame synchronization signal). ■ and K are written with the time axes aligned, and from now on L is 1 and a
It turns out that you only have to move forward in time.

That is, the phase difference control signal generating section 8 generates a' for each frame.
-QI, b'-(1, C'-Q, d'-Q,
@'-(1, f'-α, etc. are calculated, and at this timing the phase of the first frame synchronization signal which is the output of the second frequency converter 9 is controlled. Since the second frame synchronization signal and the first frame synchronization signal are synchronized by the second frequency converter 9, it is not necessarily necessary to perform phase control on all frames.
The playback time code of is stored in the second time code correction section 1o.
is used to correct the time code that is cylindrical at the timing indicated by the upward arrow in the figure from the second reference phase difference and the reproduction phase difference offset, and outputs it in the first seven-timing period.

As described above, during recording, the time code and phase difference offset are recorded together with the data signal, and during playback, by controlling the phase of the output of the frequency converter from the time code and phase difference offset, the operation is performed using the second frame synchronization signal. It is possible to make the signal recording and reproducing device that has the first frame synchronization signal look like a signal recording and reproducing device that has the first frame synchronization signal, and it is possible to perform highly accurate synchronized reproduction.

FIG. 2 is a block diagram of a second embodiment of the invention. In FIG. 2, blocks given the same numbers as in FIG. 1 are the same blocks as in FIG. 1. 11 is a frequency conversion section. In the first embodiment, two frequency converters were used, but in the second embodiment, both were made the same, and the frame phase of the signal recording/reproducing unit 6 was changed to the phase control signal optical signal with respect to the first frame synchronization signal. By controlling using the unit 8, it is possible to operate as a timing slave to an external frame synchronization signal both during recording and during playback.

Effects of the Invention The present invention detects the phase difference between the first and second frame synchronization signals during recording and writes them together with the time code in the form of a phase difference offset when signal recording and reproducing devices with different frame frequencies are operated in synchronization. By controlling the phase of the first frame synchronization signal by the second frequency converter according to the phase difference offset read during playback, the relationship between the playback data signal and the time code is determined during recording and playback. Moreover, it can be operated as a signal recording/reproducing apparatus having the first frame period when viewed from the outside. Therefore, by controlling the operation of the slave signal recording and reproducing device so that the time codes output by the signal recording and reproducing device are equal based on this first frame synchronization signal, synchronized playback can be performed with high precision. can.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a signal recording/reproducing apparatus according to a first embodiment of the present invention, FIG. 2 is a block diagram of the second embodiment, FIG. 3 is a timing chart showing operations during recording, and FIG. The figure is a timing chart showing the operation during playback, Figure 6 is a block diagram of a conventional signal recording and playback device,
The figure is a timing chart of a frame synchronization signal during synchronous recording and reproduction in a conventional example. DESCRIPTION OF SYMBOLS 1... 1st frequency conversion section, 2... Phase difference detection section, 3... 1st phase difference calculation section, 4...
. . . Phase difference offset calculation section, 5. . . First time code correction section, 6 . . . Signal recording/reproduction section, 7
. . . - second phase difference calculation section, 8 . . . phase control signal generation section, 9 . . . second frequency conversion section, 10
...Second time code correction section, 11...
Frequency conversion section. Name of agent: Patent attorney Toshio Nakao and 1 other person
God Kaoru
Seagull (Annie h)
2 J 狋 → ト ward -H 檎 Hill method method

Claims (1)

[Claims] a first frequency conversion means for converting a first frame frequency to a second frame frequency during recording;
a phase difference detection means for detecting a phase difference between frames of the frame frequency of and the second frame frequency, and a first standard that matches the phase difference of two frames having different frame frequencies from the recording time code according to a predetermined rule. a first phase difference calculation means for calculating a phase difference; and a phase difference offset that is the difference between the phase difference detected by the phase difference detection means and a first reference phase difference found by the first phase difference detection means. a phase difference offset calculation means for calculating, and a first recording time code in units of the first frame frequency, corrected by the first reference phase difference, and a second recording in units of the second frame frequency; a first time code correction means for calculating a time code; recording the second recording time code obtained by the first time code correction means and a phase difference offset calculated by the phase difference offset calculation means; a signal recording/reproducing means; and a signal recording/reproducing means;
a second frequency conversion means for converting the frame frequency of the frame frequency into the first frame frequency, and a second frequency conversion means for determining a second reference phase difference from the first reproduction time code reproduced from the signal recording and reproduction means. a phase difference calculating means, a phase difference offset reproduced from the signal recording and reproducing means and the second
The phase relationship between the second frame frequency and the first frame frequency of the second frequency conversion means is determined from the second reference phase difference obtained by the phase difference calculating means of a phase control signal generating means for controlling the phase control signal to be the same, and correcting the first reproduction time code in units of the second frame frequency by the second reference phase difference and the reproduction phase difference offset, A signal recording/reproducing apparatus comprising: second time code correction means for determining a second reproduction time code in units of the first frame frequency.