JPH01201885A - Time information recording/reproducing device - Google Patents

Abstract

PURPOSE:To enhance the precision of the reproduced editing of information by adding a phase difference to a time code in units of the sub-frame number of the time code even when the frame phase of the input time code is different from the frame phase of a recording means. CONSTITUTION:A converting part 100 converts a high-order time code TCIN and a sub-frame number alpha IN into a high-order time code TC1 and a sub-frame number alpha1, and a dislocation value d1 is calculated. An input frame converting part 101 generates the time code TC1 and a top timing clock FCK1 from the dislocation value d1 and a top timing clock FCKIN. A timing generating part 102 generates a frame clock FCK2 of a recording/reproducing part 105. A phase difference detecting part 103 detects the phase difference between the FCK1 and the FCK2, and outputs a phase difference alphad2. An input phase difference correcting part 104 adds the time code TC1, the alpha1 and the alphad2, and outputs them as the TC2 and the alpha2 in synchronization with the FCK2. Thus, highly precise editing is attained between devices at different frame cycles.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is directed to recording and reproducing signals such as audio and images and corresponding time information in R-DAT (rotary head digital audio tape recorder), digital VTR, etc. The present invention relates to a news recording/reproducing device.

BACKGROUND ART In recent years, digital technology has been applied to many fields such as audio and image, and technologies such as CD players, R-DATs, and digital VTRs have been established.

Among these, multiple recording devices record basic PCM signal recording and playback technology as well as time information corresponding to the PCM signal (hereinafter referred to as time code), and use this time code to cue the recording or playback point. Connect a playback device and record synchronously.

Time code control technology that performs synchronous playback and editing has become important.

Therefore, in conventional time information recording and reproducing devices, a PCM sample is divided into frames, and a time code whose minimum unit is a frame number is recorded for each frame, and one time code is recorded for multiple PCM samples belonging to one frame. I have tried to give

Problems to be Solved by the Invention However, with the above-mentioned method, it is difficult to perform synchronous editing with an accuracy of less than a frame. This is because a plurality of PCM samples belonging to one frame are all expressed in time using one type of time code, and do not have time information below the frame.

FIG. 6 is a timing chart showing the relationship between input samples and recording time codes of a conventional time information recording/reproducing device.

In FIG. 6, ten input samples are input as one frame, and an input time code corresponding to the input frame is input with frame-by-frame precision. On the other hand, the recording frame of the recording device is delayed by 0.2 frames with respect to the input frame. However, since the time code only has an accuracy in units of frames, the recording time code is the same as the input time code.

Therefore, the relationship between recorded PCM samples and time codes is not uniquely determined.

In order to accurately determine the relationship between time code and PCM samples, it is necessary to synchronize the frame phases when transferring time code between multiple recording/playback devices. It is necessary to establish a rule that the two are the same. Then, the phase difference between frames 0 and 2 in Figure 6 will not occur, the first PCM sample of the frame will match the time indicated by the time code, and the following PCM samples will be 0.
．． It can be regarded as corresponding to the time delayed one frame at a time.

However, it may be inconvenient to always require frame synchronization when transmitting time codes.

In general, the frame period of various recording and reproducing devices is often influenced by the content of information handled by the device or the configuration of the device, and the frame period often differs between different types of recording and reproducing devices.

For example, in an NTSC color VTR, approximately 33.37 m5ec, R-DA
In T, it is 30 m5ec.

When time codes are transferred between devices having different frame periods, the frame phase synchronization described above may not be achieved.

FIG. 7 is a timing chart showing the conversion of continuous time codes having a frame period ratio of 4:3.

In Figure 3, time code 1 has a frame period of 40
Among the time codes transferred from the m5eC playback device, time code 2 is a time code converted for recording on a recording device with a frame period of 30 m5ec.

If timecode 1 is consecutive, timecode 2
By synchronizing the frame phase of the frame with the frame phase of the recording device, the time of the first sample of the frame can be made to match the time code.

FIG. 8 is a timing chart showing the conversion of discontinuous time codes that also have a frame period ratio of 4:3. In Figure 8, time code 1 is discontinuous at point a, so the frame phase of time code 2 is d.
It becomes discontinuous at a point.

In this case, if the frame phase of time code 2 and the recording frame phase are newly synchronized at the discontinuous point, the time of the first sample of the frame and the time code can be made to match, but in reality, during the recording operation, Since it is impossible to change the phase of the recording frame, synchronization cannot be achieved, and there is a problem in that the time of the PCM sample and the time code must be recorded while being inconsistent.

In view of the above-mentioned problems, the present invention provides information in units below the frame number (subframe number) as a time code.
Even when the frame phase of the input time code and the recording frame phase do not match, by having
The present invention provides a time information recording and reproducing device that can uniquely determine the relationship between sample time and time code. FIG. 9 shows the relationship between input samples and recording time codes when subframe numbers are introduced in units of frames.

Means for Solving the Problems In order to solve the above-mentioned problems, the time information recording and reproducing apparatus of the present invention records first input time information corresponding to the beginning of a frame of input information divided into frames or a specific timing. input time information converting means for converting the input information into second input time information having a frame period different from the input information; recording means for recording the input information; recording frame timing generating means for determining a frame phase of the recording means; Phase difference detection means for detecting a phase difference between a frame of second input time information and a recording frame; and a phase difference correction means for outputting third input time information that is the second input time information corrected based on the phase difference. and a phase synchronization means for phase synchronizing the frame of the third input information and the recording frame of the recording means, and a reproduction means for reproducing the recorded input information and the third input time information, and the recording means comprises a third input information frame and a recording frame of the recording means. The system is configured to record input time information.

According to the above-described configuration, the present invention adds a phase difference described in units of subframe numbers of the time code to the time code even when the frame phase of the input time code and the frame phase of the recording means are different. It is possible to record the input time code and input PCM samples while keeping the time relationship constant. It is also possible to set the subframe number to 0'' by synchronizing the frame phase of the input time code and the frame phase of the recording means.Furthermore, even if the frame period of the input time code and the frame period of the recording means are different, the frame period of the time information can be changed. By converting, the input time code and PCM sample can be recorded and reproduced while preserving the correspondence between the input PCM sample and the input time code.

Embodiments Hereinafter, embodiments of the time information recording/reproducing device of the present invention will be described with reference to the drawings.

FIG. 1 shows the configuration of a time information recording and reproducing device according to the present invention.
022 diagram.

In FIG. 1, 100 is an upper time code TCIN representing a time higher than the frame unit of the input time code.
and subframe number unit N into an upper time code TC and subframe number α1 having different frame periods, and at the same time calculate a frame shift value d1 representing the shift in the start timing of the frames of TCIN and TCl. This is a code converter.

101 is the frame shift value d1 generated by the input time code converter 100 and the input time code TCIN.
This is an input frame conversion unit that generates an input frame clock FCKIN representing the timing of the beginning of the frame of and αIN, a converted time code TC1, and a frame clock FCK1 representing the timing of the beginning of the frame of α1.

FIG. 2 shows a timing chart showing the operations of the input time code converter 100 and the input frame converter 101.

In FIG. 2, TCIN and αIN are frame periods of 40
The time code of m5eC, FCKIN is the input frame clock representing the timing of the beginning of the frame of TCIN and αIN, TCl and α1 are the frame period 30m5e
The converted time code FCKl of c is the frame clock FCK1 generated by the input frame converter 101 based on the input frame clock FCKIN and the start timing deviation value d1. The frame shift value d1 changes from frame to frame.

In FIG. 1, 102 is a frame clock F that determines the frame timing of recording and reproduction in the recording and reproduction section 106.
This is a frame timing generator that generates CK2. The frame timing generation section 102 includes the system control section 11
FCK2' reset signal R3TFCK supplied from 1
2 is "1pa", it is reset by the frame clock FCK1 generated by the input frame converter 101,
FCKl and FCK2 are synchronized.

103 is a phase difference detection unit that detects the phase difference between the frame clock FCK and the door V-clock FCK2 and outputs a phase difference αd2; 104 is an input time code conversion unit 1
00 output time code TC,.

α1 and the phase difference αd2 output from the phase difference detection section 103
and synchronize with frame clock FCK2,
Te3. This is an input phase difference correction unit that outputs α2.

Reference numeral 105 denotes a recording and reproducing section that performs recording and reproducing at a frame timing synchronized with the frame clock FCK2 generated by the frame timing generating section 102. Recording and reproducing section 106
is 30m5e using a rotating head recording and reproducing method.
Two diagonal tracks are formed on the tape during one period of the frame clock FCK2 having c period, and one type of time code is recorded in units of two trunks.

Further, in the recording mode, the recording/reproducing unit 105 directly inputs the time codes TC2 and α2 to Te3. When in playback mode, the time code played back from the tape is output as Te3. Output as α3.

FIG. 3 shows an example of a time code recording format on a tape realized by the recording/reproducing section 105.

In FIG. 3, time codes TC2 and α2 are PAC
It is expressed as 8-byte data called K. The 0th word Pack Item is identification data that indicates the attribute of PACK. For example, when Pack Item = "1100", it is defined to represent a time code. FLAG
is flag data for storing the format of the input time code. For example, when FLAG=“oooo”, 4
Time code with a frame period of 0m5ec, FLA
G: “0001” indicates a time code with a frame period of 30m5ec. This flag has the same form as the time code input when reproducing and outputting the time code, and can be referenced when outputting the time code.

Subframe numbers 1 and 2 in the first and second words are subframe numbers obtained by further dividing the frame number, and correspond to α2 of the time code. Words 1-2 16
Divide the bit data into 4 parts to create 4 parts in BCD format.
Digits from 0000 to 9999 can be expressed. Word 3 is time data expressed in two BCD digits, and expresses Q to 23. Word 4 is minute data expressed in two BCD digits, 0 to 6.
Express up to 9. Word 5 is second data expressed in two BCD digits, representing 0 to 59. Word 6 is a frame number expressed in 2 digits of BCD, and is 3n to associate a frame of 30mπ with a second.
00~32゜3n+ in seconds 00~32,3n+ in 1 second
oO~33 (n=o, 1, 2...-,
19).

Also, the recording/reproducing section 105 inputs PCM audio data D.
It has a function of recording TIN and outputting the recorded data as output PCM audio data DTOUT. PC
Recording and reproduction of the M audio data is performed in response to the -7 frame clock FCK2 generated by the frame timing generating section 102, similarly to the time code. Furthermore, the recording/reproducing unit 105 takes into account time code delays caused by input time code conversion processing and output time code conversion processing.
It is assumed that an appropriate delay can be given to PCM audio data during recording and reproduction.

Output time code converter 106, output frame converter 1
07, the output frame timing generating section 108, the output phase difference detecting section 109, and the output phase difference correcting section 110 have substantially the same functions as the respective sections 100 to 104 on the input side, so a description thereof will be omitted.

When connecting multiple recording/playback devices, if each device has an input time code conversion function as described above, time code processing on the output side is not necessary. When connecting to a recording/playback device with a different cycle, time code conversion processing on the output side is required.

111 is a frame clock reset flag R8TFCK2. which instructs the frame timing generating section 102 and the output frame timing generating section 108 to reset the frame clock. This is a system control unit that supplies R8TFCKOUT. The frame timing generating section 102 and the output frame timing generating section 108 are reset when the recording/reproducing section 106 is performing a recording or reproducing operation, or when an external device to which the output time codes TCOUT and αOUT are connected is recording. or during playback operations, must be avoided.

Next, the input time code conversion process of the time information recording/reproducing apparatus explained in FIG. 1 will be explained in detail.

FIG. 4 is a timing chart showing the timing of input time code conversion processing.

In FIG. 4, TCIN indicates an upper time code greater than or equal to the frame number of the input time code, αIN indicates all subframe numbers of the input time code, and FCKI
N is the input frame clock representing the timing of the beginning of the frame of the input time code. In this case, the input time code has a period of 40m5eC, the subframe number αIN remains "0", and the upper time code T
CIN is continuous from 0 hours Q minutes Q seconds 0 frames (hereinafter, units of seconds or more are omitted) to 6 frames, and continuously from 9 frames to 12 frames.
There are discontinuities between frames. However, the phase is continuous. What is converted by the input time code conversion unit 100 is an upper time code TC1 and subframe number α1 having a frame period of 30 m5ec. FCK
1 is frame clock 1 representing the beginning of the frame with time code TC1 and α1.

When time code conversion is performed on TCIN and αIN in the same manner as in FIG. 2, the frames become discontinuous and the frame phases become discontinuous between frames 9 and 12 of TCl and α1.

R3TFCK2 is a frame clock reset signal that synchronizes the frame clock FCK1 and the frame clock FCK2 used for recording and reproduction.

R3TFCK2 becomes active before the recording/reproducing unit 105 enters recording mode, and input time code TCIN,
The frame of αIN and the frame of the recording/reproducing unit 105 are synchronized. After synchronization, TCIN.

If αIN is continuous, the subframe number α2 of the time code after input conversion becomes the same as the subframe number αIN of the input time code, and remains constant. T
e3. α2 is the time code after input phase difference correction,
Phase difference ct for time code TC1, α1 before phase difference correction
d1 is added. The time codes TC2 and α2 after phase correction are the frame clock reset signal R.
Until reset by 3TFCK2, the subframe number α2 becomes a because the phases of the frame clock FCK2 and the frame clock FCK1 used for recording and reproduction are shifted by a. FCK2 by R3TFCK
After the subframe number α2 is reset, the subframe number α2 becomes “0” because the phases of FCK and FCK2 match.

Since the frame phase becomes discontinuous at the point where Te3 changes from 9 frames to 12 frames, the phase difference αd2 becomes b, and the subframe α2 after phase difference correction becomes b. If the frame clock reset signal R3TFCK2 is activated at the point where the 9th frame changes to the 12th frame, the phase difference αd2 can be set to o11, but since the recording/reproducing unit 1oI5 is in the recording mode at this time, no reset is applied. FCK2 is a frame clock that determines the frame timing of the recording/reproducing section 106,
During recording mode, the frame phase is constant.

PR is a signal indicating the mode of the recording/reproducing section; "Oll" indicates the reproduction mode, and "2" indicates the recording mode.

Next, the output time code conversion process will be explained.

FIG. 5 is a timing chart showing the timing of output time code conversion processing.

The upper time code TC3 and the subframe number α3 are the time codes reproduced by the recording/reproducing section 105. The recorded time code is the one recorded after the input time code conversion process explained in FIG. In Figure 6, the time code TC3°α3 is from frame 4 to frame 9.
The subframe number α3 is constant at “O”. The time code becomes discontinuous from the 9th frame to the 12th frame, but the frame phase remains constant. The time code after the 9th frame is constant.
The subframe number σ3 is also a constant value.

FCK2 is a frame clock that determines the frame timing of the recording/reproducing section 106. Upper time code T
C4, subframe number α4, is the time code after output time code conversion. At the point where time codes TC3 and α3 before output time code conversion are discontinuous, time codes TC4 and α3 after output time code conversion are
α4 also becomes discontinuous, and the frame phase also becomes discontinuous. R
3TFCKOtJT is a frame cross reset signal that resets the output frame timing generator 108.

When R3TFCKOUT becomes active, the output through-frame clock FCK of the output frame converter 1Q7
3 and the frame clock FCKOUT generated by the output frame timing generating section 10B can be synchronized. Upper time code TCOtJT.

αOUT is the time code TC4, α4 output from the output time code conversion unit 106, and the output phase difference detection unit 109
Add the phase difference αd4 outputted by the frame clock F
Output in synchronization with CKOUT. time code TC
OUT and aOUT are continuous from 3 to 67V-A,
It becomes discontinuous from frame e to frame 9, and from frame 9 to
It is continuous up to 12 frames. At the change point from frame e to frame 9, the frame phase is continuous. In this case, the phase difference αd4 output by the output phase difference detection section is
Since the phase difference αd2 generated in the input time code conversion process explained in FIG. 4 was b, it becomes -. Therefore, the output subframe αOUT becomes 110I+. In other words, when the frame period of the input time code TCIN, αIN and the output time code TCOUT, αOUT is the same, it becomes αIN−α○UT.

Effects of the invention As described above, the time information recording and reproducing device of the present invention has the following advantages:
recording means for recording input information divided into frames;
recording frame timing generation means for determining the frame phase of the recording means; phase difference detection means for detecting the phase difference between the frame of input information and the recording frame; The recording means records the second input time information and combines the recorded input information with the second input time information.
By providing a reproducing means for reproducing input time information, when input information divided into frames and time information corresponding to the input information are recorded, the frame phase of the input information and the frame phase of the recording means are different. Since the time information can be recorded in a form in which the phase difference is corrected, the correspondence between input information and time information is preserved, and it is possible to reproduce and edit information with higher precision than in frame units. Furthermore, by providing frame phase synchronization means for the input information frame and the recording means, when the time information is continuous, the frame phase of the input information and the frame phase of the recording means are synchronized, Since the component (subframe number) can be set to "oII," the processing when starting one edit is simplified. For example, if the frame period of the input information is equal to the frame period of the recording means, the subframe number It is possible to associate input information with time information without using .

Furthermore, by providing a time information converting means for converting the frame period of time information corresponding to the input information, input information whose frame period of the input information is different from the frame period of the recording means and the time information corresponding thereto can be converted into the input information. Since the correspondence of time information can be stored with an accuracy of less than a frame unit, highly accurate editing is possible between devices with any frame period.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a time information recording and reproducing apparatus in an embodiment of the present invention, FIG. 2 is a timing chart showing the operation of an input time code conversion section and an input time code conversion section, and FIG. 3 is a time chart showing the operation of an input time code conversion section and an input time code conversion section. A format diagram showing the code recording formant, Fig. 4 is a timing chart showing the timing of input time code conversion processing, Fig. 5 is a timing chart showing the timing of output time code conversion processing, and Fig. 6 is a conventional time information recording. FIG. 7 is a timing chart showing the relationship between input samples and recording time codes in a playback device; FIG. 7 is a timing chart showing continuous time code conversion; FIG. 8 is a timing chart showing discontinuous time code conversion; FIG. is a timing chart showing the relationship between input samples and recording time codes when subframe numbers are introduced. 100... Input time code conversion section, 101.
...Input frame conversion section, 102 ... Frame timing generation section, 103 ... Phase difference detection section, 104 ... Input phase difference correction section, 105 ...
. . . Recording and playback section, 106 . . . Output time code conversion section, 107 . . . Output frame conversion section,
1o8...Output frame timing generator, 1
09...-Output phase difference detection section, 110...
- Output phase difference correction section, 111... system control section.

Claims (3)

[Claims] (1) Recording means for recording input information divided into frames, recording frame timing generation means for determining the frame phase of the recording means, and phase difference detection for detecting the phase difference between the frame of the input information and the recording frame. means, based on the phase difference, the beginning of the frame of the input information;
or phase difference correction means for outputting second input time information obtained by correcting the first input time information corresponding to a specific timing; the recording means records the second input time information; 1. A time information recording and reproducing device comprising a reproducing means for reproducing input information and second input time information. (2) A recording means for recording input information divided into frames and input time information corresponding to the beginning of the frame of the input information or a specific timing, and a recording means for recording the input information divided into frames and the recording frame of the recording means. A time information recording and reproducing device characterized by comprising a phase synchronizing means for performing phase synchronization, and a reproducing means for reproducing the recorded input information and input time information. (3) Input time information for converting first input time information corresponding to the beginning of a frame of input information divided into frames or a specific timing into second input time information having a different frame period from the above input information. a converting means, a recording means for recording the input information, a recording frame timing generating means for determining a frame phase of the recording means, and a phase difference for detecting a phase difference between the frame of the second input time information and the recording frame. and a phase difference correction means for outputting third input time information obtained by correcting the second input time information based on the phase difference, and the recording means records the third input time information. A time information recording and reproducing device characterized in that it comprises a reproducing means for reproducing the recorded input information and the third input time information.