JPH02301086A - Signal recorder and signal reproducing device - Google Patents

Abstract

PURPOSE:To record a time code coinciding with the frame cycle of a signal recording means by eliminating jitter in an input time code by providing a smoothing means, a phase information correction means, and a time code conversion means. CONSTITUTION:A read time code 8 and the frame signal 9 of the time code are extracted from the time code 7 inputted to a time code read part 1. Phase information 11 is outputted from the frame signal 9 and a frame signal 10 at a phase information detecting part 2. The frame signal 12 of the time code in which the frame signal 9 is inputted and smoothed is outputted from the smoothing part 3. At a phase information correction part 4, the read time code 8 and the phase information 11 are corrected by using the frame signal 9 and the frame signal 12, and corrected time code 13 and phase information 14 are outputted. The time code 13 and the phase information 14 are converted to the time code 15 and phase information 16 at a time code conversion part 5, and the time code 15, the phase information 16, and an input signal 17 are recorded with a frame cycle at a signal recording part 6.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is applicable to rotary head digital audio tape recorders (hereinafter referred to as R-DAT), digital VTRs, etc., for recording audio and image signals and corresponding time codes. The present invention relates to a signal recording device and a signal reproducing device that perform playback on a frame-by-frame basis.

2. Description of the Related Art In recent years, digital technology has been applied to many fields such as audio and video, and technologies such as CD players, R-DATs, and digital VTRs have been established. Among them, in addition to recording and reproducing technology for PCM signals, time codes compatible with PCM signals are recorded and reproduced, and this time code is used to cue recording and playback, and by connecting multiple recording and reproducing devices, synchronous recording, Time code recording and playback technology that performs synchronous playback and editing has become important.

Conventionally, SMPTE/EBU time codes have been widely used as time codes in broadcast equipment such as VTRs. In order to enable connection with conventional equipment, R-DAT
In order to record and play back SMPTE/EBU time code using a rotating head using a signal recording/playback device with a frame frequency different from that of the SMPTE/EBU timecode, it is necessary to It was necessary to record and reproduce information representing the temporal relationship with frames. For example, JP-A-6
There was a rotary head type recording/reproducing device as shown in Japanese Patent No. 3-29391.

An example of a conventional signal recording device and a conventional signal reproducing device will be described below with reference to the drawings.

FIG. 4 shows a block diagram of a conventional signal recording device.

In FIG. 4, 41 is a time code reading section, 42
43 is a phase information detection section, and 43 is a signal recording section such as R-DAT.
It is. The operation of the signal recording device configured as described above will be explained below.

The time code 44 input to the time code reading section 41 is read by the time code reading section 41, which outputs a read time code 45 and extracts a time code frame signal 46. Phase information detection section 42
Then, phase information 48 is detected from the time code frame signal 46 output from the time code reading section 41 and the frame signal 47 from the signal recording section 43. Here, the phase information represents the time from the beginning of each frame in the signal recording section or the signal reproducing section to the beginning of the time code frame preceding the frame.

FIG. 5 is a timing chart showing the operation of the phase information detection section 42.

In FIG. 5, C is a time code frame signal, D
E represents the count of the counter of the phase information detection section 42, and E represents the frame signal of the signal recording section 43. Phase information detection section 4
The counter No. 2 is reset at the rising edge of the frame signal of the time code, starts counting from 0, stops counting at the rising edge of the frame signal of the signal recording section 43, and outputs the counter value at this time as phase information. In the example shown in this figure, 1 is output as the phase information. The signal recording section 43 records the read time code 45 from the time code reading section 41, the phase information 48 detected by the phase information detection section 42, and the input signal 49 at a frame period.

FIG. 6 shows a block diagram of a conventional signal reproducing device.

In FIG. 6, 61 is a signal reproducing unit, for example, R-DAT;
62 is an oscillation section, and 63 is a time code generation section. The operation of the signal reproducing device configured as described above will be explained below.

The signal reproducing section 61 reproduces the time code 64, phase information 65, and output signal 66. The oscillation unit 62 generates a time code frame signal 68 from the reproduced phase information 65 and the frame signal 67 from the signal reproduction unit 61. Oscillator 6
2 is a counter whose maximum count value is the frame period of the time code, and the frame signal 6 of the signal reproducing unit 61 is
The phase information 65 reproduced at the rising edge of 7 is loaded,
When the maximum value is reached, a pulse is generated and output as a time code frame signal 68. Time code generator 6
3, a time code 69 is output from the time code 64 reproduced by the signal reproducing unit 61 and the time code frame signal 68 output from the oscillating unit 62.

Problems to be Solved by the Invention However, with the conventional signal recording device and signal reproducing device described above, when a time code with jitter is input, such as when playing back time code recorded in the longitudinal direction of a tape with a fixed head, However, since jitter is recorded and reproduced, there is a problem that the jitter of the time code increases as the number of dubbing of the time code increases.

In addition, in the conventional signal reproducing device described above, the frame frequency of the reproduced time code is a fixed frequency determined by the transmitter of the signal reproducing device, and there is a problem in that it is not possible to correctly reproduce a time code with a frequency different from that frequency. existed.

Furthermore, in the above-mentioned conventional signal recording device and signal reproducing device,
There was a problem in that the frame of the signal recording device and the signal reproducing device could not be identified using only the time code value.

For example, when using the SMPTE time code of the NTSC color television system as the time code and using R-DAT as the signal recording and reproducing device, each frame period is 33.37 m5.30 m5, and 2 R-DAT per time code frame. There are cases where the frames correspond to each other, and in this case, there is a problem in that it is not possible to specify the frame of the signal recording/reproducing device using only the time code value.

The present invention solves the above-mentioned conventional problems, and aims to provide a signal recording device and a signal reproducing device that record and reproduce time codes while eliminating jitter.

Another object of the present invention is to provide a signal reproducing device that can correctly reproduce time hoods even when the frame frequencies of time codes differ.

In addition, the signal recording device and signal reproducing device facilitate frame-by-frame time code processing in the signal recording device and signal reproducing device by converting the input and output time code into a time hood of the frame period of the signal recording device and signal reproducing device. The purpose of the present invention is to provide a signal reproducing device.

Means for Solving the Problems To achieve this object, the signal recording device of the present invention includes time code reading means for reading a first time code and extracting a frame signal of the first time code; phase information detection means for detecting a frame signal of the time code and phase information of the frame signal of the signal recording means; a smoothing means for smoothing the frame signal of the first time code; and smoothing by the smoothing means. phase information correction means for correcting the first time code read by the time code reading means and the phase information detected by the phase information detection means using frame signals of the previous and subsequent first time codes; a time code conversion means for converting the first time code and phase information corrected by the phase information correction means into a second time code and phase difference information that corresponds to the frame period of the signal recording means; and the time code conversion means The apparatus is equipped with a signal recording means for recording the second time code converted by , the phase difference information, and the input signal at a frame period.

Further, in order to achieve the above object, the signal reproducing device of the present invention includes a signal reproducing means for reproducing a second time code, phase difference information, and an output signal in a frame period, and a signal reproducing means reproduced by the signal reproducing means. time code converting means for converting a second time code and phase difference information having a frame period of the reproduction means into a first time code and phase information; and a frequency variable generating a frame signal of the first time code. oscillation means; phase information detection means for detecting a first time code frame signal which is the output of the frequency variable oscillation means; and phase information of the frame signal of the signal reproduction means; and an output of the time code conversion means. a phase information comparing means for comparing certain phase information with the phase information detected by the phase information detecting means and outputting a result; and smoothing the output of the phase information comparing means and controlling the frequency of the variable frequency oscillation means. a smoothing means; a time code generating means for outputting a first time code from a first time code which is an output of the time code conversion means and a frame signal of the first time code which is an output of the frequency variable oscillation means; It is equipped with the following.

Effect: With the above-described configuration, the signal recording device of the present invention uses the frame signal of the first time code smoothed by the smoothing means to convert the first time code and phase information including jitter to the phase information correction means. A second signal having the frame period of the signal recording means corrected and corrected by the time code conversion means
Since the time code and phase difference information are converted and recorded,
It is possible to remove jitter from the input time code and record a time code that matches the frame period of the signal recording means.

Further, the signal reproducing device of the present invention has the above-described configuration, and the time code converting means converts the second time code and phase difference information reproduced by the signal reproducing means into the first time code and phase information, and A phase-locked loop comprising an information comparison means, a smoothing means, a variable frequency transmission means, and a phase information detection means generates a smoothed first time code frame signal, and generates a first time code from which jitter has been removed. can be played. Since the second time code reproduced by the signal reproducing means matches the frame period of the signal reproducing means, the frame of the signal reproducing means can be specified by the second time code. Further, even when the frame frequencies of the first time code to be reproduced are different, the first time code can be correctly reproduced by following the frequency of the frame signal of the first time code using the phase-locked loop.

EXAMPLE An example of the present invention will be described below with reference to the drawings.

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

In FIG. 1, 1 is a time code reading section, 2 is a phase information detection section, 3 is a smoothing section, 4 is a phase information correction section, 5 is a time code conversion section, and 6 is a signal recording section.

The operation of the signal recording device configured as described above will be explained below. In the following explanation, the time code input from the outside will be referred to as the first time code, and the time code recorded in the signal recording unit having the frame period of the signal recording unit will be referred to as the second time code, to distinguish between the two. .

- The first time code 7 input to the time code reading section 1 is read by the time code reading section 1, outputting the read time code 8 and extracting the frame signal 9 of the first time code. The phase information detection unit 2 receives the first signal output from the time code reading unit 1.
Phase information is detected from the frame signal 9 of the time code and the frame signal 10 of the signal recording section 6, and phase information 11 is output. The smoothing unit 3 receives the first time code frame signal 9 as input and outputs a smoothed first time code frame signal 12. The smoothing unit 3 removes jitter from the input first time code frame signal.
For example, it can be configured by a phase-locked loop. The phase information correction unit 4 uses the frame signal 9 of the first time code before smoothing in the smoothing unit 3 and the frame signal 12 of the first time code after smoothing to obtain the read time code from the time code reading unit 1. 8 and the phase information 11 detected by the phase information detection section 2, and output the corrected first time code 13 and phase information 14. The phase information correction unit 4 corrects the phase information by the time difference between the first time code frame signal before and after smoothing. As a result of the correction, when the value of the phase information exceeds one frame, one frame is added to the value of the first time code, and the time of one frame is subtracted from the phase information. Furthermore, when the value of the phase information becomes negative, one frame is subtracted from the value of the first time code, and the time of one frame is added to the phase information. The time code converter 5 converts the first time code 13 corrected by the phase information corrector 4.
and phase information 14 are time code converted to a second time code 15 having the frame period of the signal recording section 6 and phase difference information 16, and output. Here, the phase difference information is
Represents a sub-frame remainder of the second time code when converting the first time code and phase information into the second time code.

FIG. 2 is a timing chart showing the operation of the time code converter 5. The operation of the time code converter 5 will be explained using FIG.

In FIG. 2, A represents a first time code having a frame period T1, and B represents a second time code having a frame period T2 of the signal recording section. i is the first time code expressed as the total number of frames up to the beginning of the relevant frame.
j is the frame number of the second time code expressed as the total number of frames up to the beginning of the corresponding frame of the second time code, nj and ml are the frame number of the second time code j Each represents phase information and phase difference information. Also, TH, TM.

TS and TF are the frames at the time of 9 minutes and 9 seconds, respectively, of the frame number i of the first time hood, SH, SM, SS, and S
F represents each hour 9 minute 1 second frame of frame number j of the second time code.

The time code value represents the time at the beginning of the frame. Therefore, in FIG. 2, the frame and phase information at the time of 9 minutes and 9 seconds of frame number 1 of the first time code are as follows:
0:00 of the first time code.

It represents the time TT from minutes 0 seconds 0 frame to the beginning of the frame with frame number j of the second time code. 1st
The conversion of the time code to the second time code is TT,
is expressed by the frame period of the second time code. The formula for time code conversion is shown below.

TTJ = n1+ i T 1 ・
...(1)j =INT(TT1/T2) River(
2) J = T'T', mod T2
(3) Here, INT(x) is a function that converts X into an integer, and xmody is a function that represents the remainder when X is divided by y. As the first time code, for example, SMP
When using the TE non-drop mode time code, the frame number i is given by the following equation.

1=108000T11+1800TM+30TS
+ T, F...(4) Also,
When R-DAT is used as the signal recording unit, the frame number j of the second time hood is given by the following equation.

j=120000SH+2000Sil+33 SS
+ INT (SS/3) + SF...
(5) The time code conversion unit 5 converts the first time code into a second time code with a different frame period from the corrected first time code 13 and phase information 14 using the above time code conversion formula. 15 and phase difference information 16. The signal recording section 6 records the second time code 15, which is the output of the time code converting section 5, the phase difference information 16, and the input signal 17 at a frame period.

As described above, according to this embodiment, by providing the smoothing section 3, the phase information correction section 4, and the time code conversion section 5,
Using the frame signal of the first time code smoothed by the smoothing unit 3, the first time code and phase information including jitter are corrected by the phase information correction unit 4, and the second time code is converted by the time code conversion unit 5. Since the code and phase difference information are converted and recorded, jitter of the input first time code can be removed and a time code that matches the frame period of the signal recording means can be recorded.

FIG. 3 is a block diagram of a signal reproducing device in a second embodiment of the present invention.

In FIG. 3, 18 is a signal reproduction section, 19 is a time code conversion section, 20 is a phase information comparison section, 21 is a phase information detection section, 22 is a smoothing section, 23 is a variable frequency oscillation section, and 24 is a time code generation section. It is.

The operation of the signal reproducing device configured as described above will be explained below. In the following explanation, as in the explanation of the first embodiment, the time code that is output to the outside will be referred to as the first time code, and the time code that has the frame period of the signal reproducing unit that is reproduced by the signal reproducing unit will be referred to as the second time code. Distinguish between the two by calling it a time code.

The signal reproducing section 18 reproduces the second time code 25, phase difference information 26, and output signal 27. The time code conversion section 19 converts the second time code 2 from the signal reproduction section 18 into
5 and phase difference information 26 are time code converted to a first time code 28 and phase information 29, and output. The time code conversion formula at this time is given by the following formula.

TT+”ml +J T2-(8)
i ” I NT (TT+ / T 1 )
...(7) n4: 'rT', modT1
(8) The frequency variable transmitter 23 generates the first time code frame signal 30.The phase information detector 21 generates the first time code frame signal 30, which is the output of the frequency variable transmitter 23.
The phase information of the frame signal 30 of the time code and the frame signal 31 of the signal reproducing section 18 is detected, and phase information 32 is output. The phase information comparator 20 compares the phase information 29 output from the time code converter 19 with the phase information 32 detected by the phase information detector 21, and outputs a comparison result 33. The smoothing unit 22 smoothes the output 33 of the phase information comparison unit 20, and uses the smoothed output 34 to send the output to the variable frequency transmitting unit 23.
control the transmission frequency. The smoothing section 22 can be composed of, for example, a low-pass filter. Since the variable frequency oscillation section 23 is controlled by the output of the smoothing section 22, jitter has been removed from the first time code frame signal 30 that is the output thereof. The phase information comparing section 20, the smoothing section 22, the variable frequency transmitting section 23, and the phase information detecting section 21 constitute a phase locked loop.

Therefore, even when the frame frequency of the reproduced first time code is different, the frame signal of the first time code can be correctly reproduced by following the phase locked loop. The time code generator 24 outputs a first time code 35 from the second time code 28 that is the output of the time code converter 19 and the first time hood frame signal 30 that is the output of the variable frequency oscillator 23. do.

As described above, according to this embodiment, the time code converter 1
9, a phase information comparison section 20, a smoothing section 22, a frequency variable transmission section 23, and a phase information detection section 21, it is possible to reproduce the first time code 35 from which jitter has been removed. The first time code can be correctly reproduced even when the frame frequency of the code 35 is different. Furthermore, since the second time code 25 reproduced from the signal reproducing unit 18 matches the frame period of the signal reproducing unit, it is possible to specify the frame of the signal reproducing unit 18 by the reproduced second time code 25. can.

Although the signal recording device and the signal reproducing device have been described independently in this embodiment, the signal recording and reproducing device may be configured by combining the two.

Effects of the Invention As described above, in the signal recording device of the present invention, by providing the smoothing means, the phase information correction means, and the time code conversion means, the first time code frame signal smoothed by the smoothing means can be used. The first time code and phase information containing jitter are corrected by the phase information correction means, and the time code conversion means converts the first time code and phase information into the second time code and phase difference information for recording, thereby removing jitter from the input time code. However, it is possible to record a time code that matches the frame period of the signal recording means.

Furthermore, in the signal reproducing device of the present invention, since the second time code reproduced from the signal reproducing means matches the frame period of the signal reproducing means, the frame period of the signal reproducing means is changed by the reproduced second time code. can be specified. Further, a time code converting means, a phase information comparing means, a smoothing means, a variable frequency transmitting means, and a phase information detecting means are provided, and the second time code and phase difference information reproduced by the signal reproducing means are transmitted to the second time code and the phase difference information by the time code converting means. After converting the first time code and phase information into the first time code and phase information, a phase-locked loop is formed by a phase information comparison means, a smoothing means, a variable frequency oscillation means, and a phase information detection means, thereby converting the first time code into a smoothed frame. A signal can be generated and the first time code with jitter removed can be reproduced. Further, even when the frame frequency of the reproduced first time code is different, the first time code can be correctly reproduced by following the frame frequency using the phase-locked loop.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a signal recording device according to a first embodiment of the present invention, FIG. 2 is a timing chart showing the operation of a time code converter, and FIG. 3 is a signal reproduction apparatus according to a second embodiment of the present invention. FIG. 4 is a block diagram of a conventional signal recording device, FIG. 5 is a timing chart showing the operation of a phase information detecting section, and FIG. 6 is a block diagram of a conventional signal reproducing device. DESCRIPTION OF SYMBOLS 1... Time code reading part, 2... Phase information detection part, 3... Smoothing part, 4... Phase information correction part, 5... Time code conversion part, 6... Signal recording part , 18... Signal reproduction section, 19... Time code conversion section, 20... Phase information comparison section, 21
... phase information detection section, 22 ... smoothing section, 23.
... Frequency variable transmitter, 24... Time code generator. Name of agent: Patent attorney Norihei Awano (1 person)

Claims (2)

[Claims] (1) Time code reading means for reading a first time code and extracting a frame signal of the first time code; and detecting phase information of the frame signal of the first time code and the frame signal of the signal recording means. a phase information detecting means for smoothing the frame signal of the first time code, and reading the time code using the frame signal of the first time code before and after smoothing by the smoothing means. phase information correction means for correcting a first time code read by the means and phase information detected by the phase information detection means; and a signal recording of the first time code and phase information corrected by the phase information correction means. a second frame period with a frame period of means
a time code conversion means for converting the second time code and phase difference information into a second time code and phase difference information; and a signal recording means for recording the second time code, phase difference information and input signal converted by the time code conversion means in a frame period. A signal recording device comprising: (2) a signal reproducing means for reproducing a second time code, phase difference information, and an output signal with a frame period; and a second time code having a frame period of the signal reproducing means reproduced by the signal reproducing means time code conversion means for converting phase difference information into a first time code and phase information; variable frequency oscillation means for generating a frame signal of the first time code; phase information detection means for detecting a frame signal of a time code 1 and phase information of a frame signal of the signal reproduction means; and phase information that is an output of the time code conversion means and phase information detected by the phase information detection means. a phase information comparing means for comparing the output of the phase information comparing means and outputting a result; a smoothing means for smoothing the output of the phase information comparing means and controlling the frequency of the variable frequency oscillation means; 1. A signal reproducing device comprising: a time code generating means for outputting a first time code from a first time code and a frame signal of the first time code which is an output of the frequency variable oscillation means.