JPH03155293A - Signal reproducing device - Google Patents

Abstract

PURPOSE:To easily execute the timing control of frames at the time of executing synchronizing reproducing/editing by providing the signal reproducing means with a frequency conversion means, a frame synchronizing signal reset means, a time code conversion means or the like. CONSTITUTION:The signal reproducing means is provided with a frequency conversion part 1, a signal reproducing part 2, a time code conversion part 3, a time code difference computing part 4, a frame synchronizing signal reset part 5, and a signal delay part 6. Since the device is constituted so that time relation between 1st and 2nd frame synchronizing signals S1, S2 coincides with that of recording by resetting the signal S2 and a reproduced signal is delayed only by a time code difference by converting the time code S5 of the 1st frame period into the time code S6 of the 2nd frame period, signals can be reproduced synchronously with the 1st frame synchronizing signal S1 in the state that all processing frames other than the time code conversion part 3 are allowed to coincide with the 2nd frame synchronizing signal S2. Consequently, the timing control of frames can easily be executed at the time of executing synchronizing reproducing/editing in accordance with the external frame synchronizing signal.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention provides a method for reproducing a time code having a frame period different from that of the frame period at the time of recording using a signal reproducing means having frames. Head type digital audio tape recorder (hereinafter referred to as R-DAT)
It is written as ) as a signal reproducing means, and with this, for example, VT
The present invention relates to a signal reproducing device for reproducing SMPTE/EBU time code, which is R time code.

Conventional technology In recent years, digital technology has been applied to the fields of audio and video, and technologies such as CD players, R-DATs, and digital VTRs have been established. Record and play back compatible time codes, use this time code to cue recording and playback, and connect multiple recording and playback devices for synchronous recording and playback.

Technology for synchronous editing has become important.

Conventionally, SMPTE/EBU time codes have been widely used as time codes in broadcast equipment such as VTRs. Therefore, in order to enable connection with conventional equipment, R
- In order to record and reproduce SMPTE/EBU time code using a rotating head using a signal recording and reproducing device with a frame frequency different from that of SMPTE/EBU time code such as DAT, the time code frame and signal recording and reproducing are performed using a rotating head. There has been a signal recording/reproducing device capable of recording and reproducing information representing the time relationship between the device and the frame. (Hereinafter, the time code and the information representing the time relationship between frames will be collectively referred to as time code information.) In order to enable synchronized operation between multiple devices during playback in these signal recording and playback devices, time code information is used. It is necessary to use the code and phase information to synchronize with an external synchronization signal so that the time relationship between the time code of the reproduced signal and the reproduced signal matches the time relationship between the time code at the time of recording and the recorded signal. there were.

An example of such a conventional signal recording/reproducing device will be described below.

FIG. 5 shows a block diagram of this conventional signal recording/reproducing apparatus.

In FIG. 5, 51 is a frequency conversion section, 52 is a timing conversion section, and 53 is a signal recording/reproducing section (for example, R-DAT).
, 54 is a time code difference calculation section, and 55 is a signal delay section.

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

First, the time of recording will be explained.

The frequency converter 51 converts the first frame synchronization signal 551 (
For example, a VTR frame synchronization signal) is converted into a second frame synchronization signal 552 (for example, a DAT frame synchronization signal). The timing converter 52 samples the first time code 853 having the first frame period at the second frame period and outputs it as converted time code information 854.

The signal recording/reproducing unit 53 receives the second frame synchronization signal 852
Conversion time code information 354 and input signal S5 are synchronized with
5 are recorded frame by frame.

A to D in FIG. 6 are timing charts showing the time relationship between the first time code S53 and the converted time code information 854, where A is the first time code, B is the first frame synchronization signal, and C is the first frame synchronization signal. The second frame synchronization signal, D, is converted time code information.

As shown in FIG. 6, the first time code A is input to the timing converter 52 in synchronization with the first frame synchronization signal B. As shown in FIG. The timing converter 52 outputs the time code sampled at the falling edge of the second frame synchronization signal C as converted time code information. At this time,
If the first frame period is divided into 10 equal parts and expressed as time information below the frame, the time from the fall of the first frame synchronization signal B to the fall of the second frame synchronization signal C is shown in FIG. As shown in 0.4°0.2.・
It is expressed as... Therefore, the converted time code information is 2. 4. 3. It is expressed as 2.

The signal recording/reproducing section 53 records the converted time code information and the input signal 855 on the recording medium in synchronization with the second frame synchronization signal C. Note that if the first frame synchronization signal 851 is not input and only the first time code 853 and input signal S55 are input, the frequency converter 51 converts the second frame synchronization signal S52 of the standard frequency to
The timing conversion unit 62 performs timing conversion using a signal obtained by extracting the frame of the first time code S53 instead of the first frame synchronization signal 851.

Next, the operation during playback will be explained.

The frequency conversion unit 51 converts the first frame synchronization signal 851 into the second frame synchronization signal 852 in the same way as during recording. The timing converter 52 samples the first time code S53 having the first frame period at the falling edge of the second frame synchronization signal 852, and outputs it as converted time code information S54. The signal recording and reproducing section 53 reproduces the reproduction time code information 85B and the reproduction signal S57 in synchronization with the second frame synchronization signal 852. The time code difference calculation unit 54 calculates the difference between the converted time code information S54 and the reproduced time code information S56, and outputs a time code information difference 858. The signal delay section 55 delays the reproduction signal 857 for a time corresponding to the time code information difference 858.
is delayed and output as an output signal S59. E in Figure 7
-L is a timing chart explaining the operation during playback, E is the first time code during recording, F is converted time code information during recording, G is the first time suite, and H is the first time code. A frame synchronization signal, I is a second frame synchronization signal, J is conversion time code information, K is playback time code information, and L is a frame of the output signal. As described above, it is assumed that recording is performed on the recording medium at the timings shown in E and F. During playback, as shown in FIG. 7, the first time code G and the first frame synchronization signal H are
Suppose that the second frame synchronization signal and the playback time code information K happen to have such a time relationship when the second frame synchronization signal K is input. The signal reproducing unit 53 sends the recording medium in advance so that the reproduced time code information K precedes the converted time code information J by several frames (the time code difference calculation unit 54 compares the converted time code information J and the reproduced time Calculate the difference between the code information and output it as a time code information difference.In the example shown in the figure, the time code difference is 1.1 (=3.
2-2.1), the signal delay unit 57 operates to delay the reproduced signal by a time corresponding to 1.1 frames in the period of the first frame synchronization signal for the time code information difference of 1.1. do. In this way, an output signal with the same timing as during recording can be obtained.

Problems to be Solved by the Invention However, in the conventional signal reproducing device described above, the phase of the frame of the second frame synchronization signal, which is the operating frame of the signal reproducing section, and the frame of the output signal are different, that is, the apparent appearance from the outside is different. Since the frames of the output signal and the actual playback frames are different, there is a problem in that frame timing management for editing etc. is complicated.

The following will explain the case of editing as an example. Consider the above-mentioned conventional signal recording/reproducing apparatus in which the recording head is positioned, for example, two frames behind the reproducing head. FIG. 8 is a timing diagram to show this problem, where M is the first
frame synchronization signal, N! t IK 2 frame synchronization signal, 0 is the frame of the output signal which is the apparent frame, P is the frame of the reproduced signal which is the actual reproduced frame, and Q is the frame of the input signal. M, N in this figure
, 0. The timing of P is H in Figure 7, respectively.
, I, L, and K timings. The mark in the figure indicates the recording start point from which the input signal is recorded. Note that the recording start point of a signal recording/reproducing device having frames is usually a frame boundary, as shown in the example of this figure.

First, a first frame synchronization signal M which is an external synchronization signal
Using this as a reference, frame 0 of the second frame synchronization signal N1 reproduction signal frame P1 output signal is obtained in exactly the same manner as the operation of the conventional reproduction apparatus described above. Since the apparent frame of the signal recording and reproducing device is frame 0 of the output signal, the input signal Q also has to adjust the signal that comes in at this apparent frame timing to the second frame timing, which is the actual frame. must be recorded. Therefore, as shown in the figure, it is necessary to record with a delay of a time corresponding to time code information of 0.5. Due to this time delay processing, the input signal Q is delayed by two frames of the signal recording/reproducing section with respect to the output signal 0. A head that precedes this signal by two frames starts recording from the frame indicated by the mark on the recording medium, thereby performing the desired editing.

In this way, in conventional signal reproducing devices, the phase of the operating frame of the signal reproducing section and the frame when the reproduced signal is actually output from the device as an output signal is different, so when editing, etc., multiple frame timings are required. must be managed, which complicates timing processing.

The present invention solves the above-mentioned conventional problems, and is a signal reproducing device capable of synchronizing with external synchronizing signals having different frame cycles, which facilitates frame timing management when performing synchronous playback and synchronous editing according to an external frame synchronizing signal. The purpose is to provide the following.

Further, the present invention solves the above-mentioned conventional problems, and even when a time code recorded asynchronously, that is, a time code recorded without inputting the first frame synchronization signal at the time of recording, is reproduced, an external It is an object of the present invention to provide a signal reproducing device that can perform reproduction in synchronization with a frame synchronization signal.

Means for Solving the Problems In order to achieve this object, the signal reproducing device of the present invention includes frequency conversion means for generating a second frame synchronization signal from a first frame synchronization signal and a frame reset signal; signal reproducing means for reproducing a reproduced signal and reproduced time code information in synchronization with a second frame synchronization signal; and converting a first time suite having a first frame period into converted time code information having a second frame period. time code conversion means for converting the time code; time code difference calculation means for outputting a time code difference and a phase difference from the converted time code information and the reproduction time code information; and a signal delaying means for delaying the reproduced signal by a time corresponding to the time code difference.

Further, the signal recording/reproducing device of the present invention includes variable frequency oscillation means for generating a phase difference and a frame reset signal or a second frame synchronization signal, and a reproduction signal and a reproduction signal in synchronization with the second frame synchronization signal. a signal reproducing means for reproducing time code information; a time code conversion means for converting a first time code having a first frame period into converted time code information having a second frame period; and the converted time code. time code difference calculation means for outputting a time code difference and a phase difference from the information and the reproduced time code information; and a frame synchronization signal reset means for outputting a frame reset signal from the phase difference and the second frame synchronization signal. and a signal delay means for delaying the reproduced signal by a time corresponding to the time code difference.

Operation The signal reproducing device of the present invention has the above-described configuration, and by resetting the second frame synchronization signal, the time relationship between the first frame synchronization signal and the second frame synchronization signal is made to match that at the time of recording, and , by converting the time code of the first frame period to the time code of the second frame period, the playback signal is delayed only by the time code difference, so all processing frames other than the time code conversion means are It is possible to reproduce the data in synchronization with the first frame synchronization signal while matching the second frame synchronization signal with the second frame synchronization signal.

Further, in the signal reproducing device of the present invention, when the phase difference output from the time code difference calculation means deviates from zero after resetting the frame synchronization signal, the oscillation frequency of the variable frequency oscillation means is adjusted such that the phase difference becomes zero. Since the configuration is configured to control the time code information, even time code information recorded asynchronously can be reproduced correctly in synchronization with the first frame synchronization signal.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a signal reproducing device in a first embodiment of the present invention.

In FIG. 1, 1 is a frequency converter, 2 is, for example, an R-D
AT-like signal reproduction section, 3 is a time code conversion section, 4
5 is a time code difference calculation section, 5 is a frame synchronization signal reset section, and 6 is a signal delay section.

The operation of the signal reproducing device of the first embodiment configured as described above will be explained below.

The frequency converter 1 converts the first frame synchronization signal S1 into a second frame synchronization signal S1.
The frame synchronization signal S2 is converted into a frame synchronization signal S2. The signal reproducing section 2 is
The reproduction time code information S3 and the reproduction signal S4 are reproduced in synchronization with the second frame synchronization signal S2. The time code converter 3 outputs the first time code S5 having the first frame period as converted time code information S6 having the second frame period. Time code difference calculation unit 4
calculates the difference between the converted time code information S8 and the reproduced time code information S3, and calculates the time code difference S8 and the phase difference S7.
Outputs . The frame synchronization signal reset unit 5
A frame reset signal S9 delayed from the frame synchronization signal S2 by a time corresponding to the phase difference S7 is output, and the second frame synchronization signal S2 of the frequency converter 1 is reset. The time code difference calculation unit 4 calculates the difference between the reproduced time code information S3 obtained in synchronization with the second frame synchronization signal S2 after reset and the converted time code information S6, and outputs the difference as a time code difference S8.

The signal delay unit 8 delays the reproduced signal S4 by a time corresponding to the time code difference S8, and outputs the delayed signal as an output signal SIO.

Figure 2 explains this time code conversion.
l is the first time code, and F2 is converted time code information. Assuming that the period of the first frame is T1 and the period of the second frame is T2, the relationship between the first time code m and the second time code n is t=TIXm...
・(1) t+9=a+T2Xn
”・(2). Since T1 and T2 are known, the first time code m and the falling edge of the first frame synchronizing signal S1 to the rising edge of the second frame synchronizing signal S2 By obtaining the time p until the fall,
A converted time code n and phase information a are obtained. n
Convert time information expressed by and a to time code information F2
Output as . The numerical value a within 0 of the converted time code information F2 is phase information.

FIG. 3 is a timing chart explaining the operation of the signal reproducing device, where R is the first time code at the time of recording, S is the converted time code information at the time of recording, T is the first time code, and U is the first time code. 1 is the frame synchronization signal, ■ is the second frame synchronization signal, W is the conversion time code information, X is the playback time code information, and Y is the frame of the output signal. At the time of recording, it is assumed that recording onto the recording medium is performed at the timing shown in the RIS. The converted time code information S at the time of recording is recorded with time code information subjected to the time code conversion described in FIG. 2. During playback, as shown in T to Y, first, when the first time code T is input to the time code converter 3 in synchronization with the first frame synchronization signal U,
Conversion time code information W is 0 (0, 1), 1 (
0,1). Time code difference calculation section 4
is the signal reproducing unit 2 in synchronization with the second frame synchronization signal V.
The difference in phase information between the reproduced time code information or the converted time code information W output from the W is taken, and the phase difference is set to 0.
3 (=0.4-0.1). The frame synchronization signal reset unit 5 resets the second frame synchronization signal V by delaying the second frame synchronization signal by a time corresponding to a phase difference of 0.3 with reference to the second frame synchronization signal, as indicated by the square mark in FIG. As a result, the timing relationship between the first time code R and the converted time code information S at the time of recording and the first time code information at the time of playback are determined.
The timing relationship between the time code T and the converted time code information W matches. The time code difference calculation unit 4 calculates the time code difference between the reproduced time code information X and the converted time code information W, and calculates the time code difference as 1 (=
3-2). By delaying the reproduced signal by the time corresponding to the time code difference 1 in the signal delay section 6, an output signal Y whose timing relationship with the first time code matches that at the time of recording is obtained.

As described above, according to this embodiment, by resetting the second frame synchronization signal, which is the frame reference of the signal reproducing unit 2, in the frame synchronization signal reset unit 5, the first frame synchronization signal and the second frame By making the time relationship with the synchronization signal the same as when recording, and converting the time code of the first frame period to the time code of the second frame period, the playback signal is delayed by the time code difference. , all operating frames can be matched with the second frame synchronization signal, and the frame time management can be
By performing this at two frame timings, it is possible to reproduce an output signal synchronized with the first time code having a different frame period from that of the signal reproducing unit 2.

FIG. 4 is a block diagram showing the configuration of a signal reproducing device according to a second embodiment of the present invention.

In FIG. 4, 41 is a variable frequency oscillation section, 2 is a signal reproduction section, 3 is a time code conversion section, 4 is a time code difference calculation section, 5 is a frame synchronization signal reset section, and 6 is a signal delay section.

The operation of the signal reproducing device of the second embodiment configured as described above will be described below.

The operations of the components other than the variable frequency oscillator 41 are completely the same as in the first embodiment, so detailed explanations will be omitted. The variable frequency oscillator 41 first generates a second frame synchronization signal 842 of a standard frequency regardless of the input phase difference 841.
Output. The signal reproducing unit 2 reproduces the reproduction time code information 843 and the reproduction signal S44 in synchronization with the second frame synchronization signal S42. The time code conversion unit 3
The first time code 84B inputted in synchronization with the frame synchronization signal 845 is output as converted time code information 847. The time code difference calculating section 4 calculates the difference between the converted time code information 847 and the reproduced time code information 843, and outputs a time code difference 848 and a phase difference 841. The frame synchronization signal reset section 5 outputs a frame reset signal 849 delayed from the second frame synchronization signal 842 by a time corresponding to the phase difference 841, and resets the second frame synchronization signal S42 of the variable frequency oscillation section 41. . Reproduction time code information 843 and conversion time code information S47 obtained by the time code difference calculator 4 in synchronization with the second frame synchronization signal S42 after reset
The difference is calculated and output as a time code difference 848.

Further, the phase difference continues to be calculated every frame and is output as a phase difference 841. The signal delay unit 6 delays the reproduced signal 844 by a time corresponding to the time code difference 848, and outputs the output signal S4.
Output as 0. Thereafter, the variable frequency oscillator 41 uses the second oscillator whose frequency is controlled so that the phase difference 841 is always zero.
A frame synchronization signal 842 is output.

The case where asynchronous time codes are recorded and reproduced will be described using FIG. 3 described in the first embodiment. When the asynchronous first time code is time code converted, the value of the phase information a does not become a constant value because the period T1 of the first frame assumed in the time code conversion is different from the actual frame period. Therefore, the phase information 0.4 of the converted time code information S during recording gradually changes to 0.5.0.8 as time passes.

For example, assume that the converted time code information S at the time of recording is 5 (0, 5) from frame 5, and the phase information is 0.5. Then, 5 of playback time code information
．． The 6 frames are 5 (0, 5) and 8 (0, 5), respectively.
), so the phase difference output from the time code difference calculation unit 4 is not 0 but 0.1. At this time, the variable frequency oscillator 41 slightly lowers the frequency of the second frame synchronization signal so that the phase difference approaches zero. Then, the phase information of the converted time code information W increases to 0.5. Conversely, when the phase difference decreases, the opposite operation occurs.

By controlling the frequency of the second frame synchronization signal V, the frame of the output signal Y automatically follows this.

In this way, the timing relationship between the first time code and the output signal can be made similar to that during recording.

As described above, according to this embodiment, if the phase difference output from the time code difference calculation means deviates from zero after resetting the second frame synchronization signal to the same state as when recording, the phase difference By controlling the oscillation frequency of the variable frequency oscillation means so that it becomes zero, it is possible to output an output signal that is correctly synchronized with the first frame synchronization signal even when reproducing time code information recorded asynchronously. .

Effects of the Invention As described above, in the signal reproducing device of the present invention, by providing the frequency conversion means, the frame synchronization signal reset means, the time code conversion means, the time code difference calculation means, and the signal delay means, the signal reproduction device It is possible to configure a signal reproducing device capable of reproducing an output signal synchronized with a first time code having a different frame frequency from the signal reproducing section, such that all frame timings in the reproducing device are operated by the same frame synchronization signal. It is possible to provide a signal playback device that facilitates frame timing management when performing synchronous playback and synchronous editing according to an external frame synchronization signal.

Furthermore, by providing a variable frequency oscillation means controlled by a phase difference, the signal reproducing device of the present invention resets the frame synchronization signal, which is the operating standard of the signal reproducing section, to the same state as when recording, and then calculates the time code difference. By controlling the oscillation frequency of the variable frequency oscillation means so that the phase difference output from the means becomes zero, the output is synchronized with the first frame synchronization signal even when time code information recorded asynchronously is reproduced. A signal reproducing device capable of reproducing signals can be provided.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a signal reproducing device according to the first embodiment of the present invention, FIG. 2 is a timing chart showing the operation of the time code conversion section of the same embodiment, and FIG. 4 is a block diagram showing the configuration of a signal reproducing device according to the second embodiment of the present invention, FIG. 5 is a block diagram showing the configuration of a conventional signal recording and reproducing device, and FIG. 6 is a timing chart showing the operation. FIG. 7 is a timing chart showing the operation of the conventional example during recording, FIG. 7 is a timing chart showing the operation of the conventional example during playback, and FIG. 8 is a timing chart for explaining operational problems of the conventional example. It is. DESCRIPTION OF SYMBOLS 1... Frequency conversion section, 2... Signal regeneration section, 3.
... Time code conversion section, 4... Time code difference calculation section, 5... Frame synchronization signal reset section, 6
・・・Signal delay means performance

Claims (2)

[Claims] (1) Frequency conversion means for generating a second frame synchronization signal from the first frame synchronization signal and the frame reset signal, and reproducing a reproduction signal and reproduction time code information in synchronization with the second frame synchronization signal. a signal reproducing means for reproducing a first time code having a first frame period;
time code conversion means for converting into converted time code information having a frame period of , time code difference calculation means for outputting a time code difference and a phase difference from the converted time code information and the reproduction time code information; A frame synchronization signal reset means for outputting a frame reset signal from the phase difference and the second frame synchronization signal, and a signal delay means for delaying the reproduction signal by a time corresponding to the time code difference. signal reproducing device. (2) variable frequency oscillation means for generating a second frame synchronization signal from the phase difference and the frame reset signal; and a signal reproducing means for reproducing a reproduction signal and reproduction time code information in synchronization with the second frame synchronization signal. means for transmitting a first time code having a first frame period to a second time code;
time code conversion means for converting into converted time code information having a frame period of , time code difference calculation means for outputting a time code difference and a phase difference from the converted time code information and the reproduction time code information; A frame synchronization signal reset means for outputting a frame reset signal from the phase difference and the second frame synchronization signal, and a signal delay means for delaying the reproduction signal by a time corresponding to the time code difference. signal regenerator.