JP2711352B2 - Time information recording and playback device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an R-DAT (Rotary Head Digital Audio Tape Recorder), a digital VTR, and other audio and image signals and time information for recording and reproducing the time information. The present invention relates to an information recording / reproducing device.

2. Description of the Related Art In recent years, digital technology has been applied to many fields such as sound and image, and technologies such as CD players, R-DATs, and digital VTRs have been established.

Among them, along with basic PCM signal recording and playback technology,
Synchronous recording, synchronous reproduction by connecting multiple recording / reproducing devices that record time information (hereinafter referred to as time code) corresponding to the CM signal and use this time code to locate the recording or reproduction point Time code control technology for synchronous editing has become important.

Therefore, in a conventional time information recording / reproducing apparatus, a PCM sample is divided into frames, a time code having a minimum unit as a frame number is recorded for each frame, and one time code is recorded for a plurality of PCM samples belonging to one frame. Have been trying to give.

However, in the above-described method, it is difficult to perform synchronous editing with an accuracy of less than a frame. This is because the plurality of PCM samples belonging to one frame all represent time with one time code and do not have time information below the frame.

FIG. 6 is a timing chart showing the relationship between an input sample and a recording time code of a conventional time information recording / reproducing apparatus.

In FIG. 6, an input sample is input as one frame with 10 samples, and an input time code corresponding to the input frame is input with an accuracy of a frame unit. On the other hand, the recording frame of the recording device is delayed by 0.2 frames from the input frame. However, since the time code has only the accuracy of the frame unit, the same recording time code as the input time code is recorded.

Therefore, the relationship between the recorded PCM sample and the time code is not uniquely determined.

In order to accurately determine the relationship between the time code and the PCM sample, it is necessary to synchronize the frame phase when transferring the time code between a plurality of recording / reproducing apparatuses, that is, the input frame and the recording frame in FIG. Need to have rules that make Then, the phase difference of 0.2 frame in FIG. 6 does not occur, and the first PCM sample of the frame matches the time indicated by the time code, and the following PCM sample corresponds to the time delayed by 0.1 frame. Can be regarded as doing.

However, transferring the time code always requires frame synchronization, which may be inconvenient.

In general, the frame period of various recording / reproducing devices often depends on the content of information handled by the device or the configuration of the device, and the frame period is often different between different types of recording / reproducing devices. For example, VT for NTSC color
In R, about 33.37 msec, R
-For DAT, it is 30 msec.

When the time code is transferred between devices having different frame periods, a case may occur in which the frame phase cannot be synchronized as described above.

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

In FIG. 7, the time code 1 has a frame period of 40 ms.
In the time code transferred from the ec playback device, time code 2 is a time code converted for recording on a recording device having a frame period of 30 msec.

If time code 1 continues, time code 2
By synchronizing the frame phase with the frame phase of the recording apparatus, the time of the first sample of the frame and the time code can be matched.

FIG. 8 is a timing chart showing the conversion of discontinuous time codes having the same frame period ratio of 4: 3. In FIG. 8, since the time code 1 is discontinuous at the point a, the frame phase of the time code 2 is a
Discontinuous at points. In this case, if the frame phase of the time code 2 is newly synchronized with the recording frame phase at the discontinuous point, the time of the first sample of the frame and the time code can be matched, but actually, 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 that the time and the time code of the PCM sample have to be recorded without being matched.

In view of the above problem, the present invention has information (subframe number) of a unit equal to or less than a frame number as a time code, so that even when the frame phase of the input time code does not match the recording frame phase, the PCM sample can be used. Expresses time with an accuracy of less than the frame unit and uses PCM
It is an object of the present invention to provide a time information recording / reproducing apparatus capable of uniquely determining a relationship between a sample time and a time code. FIG. 9 shows the relationship between an input sample and a recording time code when a 1/10 frame unit subframe number is introduced.

Means for Solving the Problems In order to solve the above problems, a time information recording / reproducing apparatus according to the present invention comprises a first input time information corresponding to a head 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 different frame period, 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 the second input time information and a recording frame, and phase difference correction means for outputting third input time information obtained by correcting the second input time information based on the phase difference Phase synchronizing means for synchronizing the phase of the third input information frame with the recording frame of the recording means, and a reproducing means for reproducing the recorded input information and the third input time information And a recording unit configured to record the third input time information.

Effect of the Invention According to the configuration described above, the input time code is added to the time code by adding the phase difference described in units of subframe numbers of the time code to the time code even when the frame phase of the recording means differs from the frame phase of the input time code. Recording can be performed while keeping the time relationship between the time code and the input PCM sample constant. The subframe number can be set to "0" by synchronizing the frame phase of the input time code with the frame phase of the recording means. Further, even when the frame period of the input time code differs from that of the recording means, by converting the frame period of the time information, the input time code and the PCM sample can be recorded and reproduced while the correspondence between the input PCM sample and the input time code is kept.

Embodiment An embodiment of a time information recording / reproducing apparatus according to the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing a configuration of a time information recording / reproducing apparatus according to the present invention.

In Figure 1, with 100 converts the upper timecode TCIN and the sub-frame number αIN representing a higher time than the frame unit of the input time code, the higher the time code TC ₁ and subframe numbers alpha ₁ having different frame periods, an input time code conversion unit for calculating a frame shift value d ₁ representing the record of the head timing of the frame TCIN and TC _1.

101, a frame shift value d ₁ generated by the input time code conversion unit 100, the input frame clock FC representing the beginning of the timing of the frames of the input time code TCIN and αIN
From KIN, an input frame conversion unit for generating a frame clock FCK ₁ representing the timing of the beginning of the frame time code TC ₁ and alpha ₁ after conversion.

FIG. 2 is a timing chart showing the operation of the input time code conversion unit 100 and the input frame conversion unit 101.

TCIN In Figure 2, ArufaIN the time code of the frame period 40 msec, fckin is TCIN and input frame clock representing the beginning of the timing of the frame of αIN, TC ₁ and alpha ₁ is the time code after conversion of the frame period 30 msec, FC
K ₁ is the input frame clock fckin, the deviation value d ₁ of the head timing, the frame clock FCK ₁ the input frame conversion unit 101 is generated. Frame shift value d ₁ is changed for each frame.

In Figure 1, 102 is a frame timing generator for generating a frame clock FCK ₂ that determines the frame timing of the recording and reproducing of the recording and reproducing unit 105. When the FCK ₂ reset signal RST FCK ₂ supplied from the system control unit 111 is “1”, the frame timing generation unit 102 is reset by the frame clock FCK ₁ generated by the input frame conversion unit 101, and FCK ₁ and FCK ₂ synchronize.

103 is the frame clock FCK ₁ and frame clock FCK
₂ is a phase difference detection unit that detects the phase difference and outputs a phase difference αd _2. 104 is a time code TC ₁ or α ₁ output from the input time code conversion unit 100 and a phase difference output from the phase difference detection unit 103. αd ₂ is added, and synchronized with the frame clock FCK ₂ , TC
_2, an input phase difference correction unit for outputting as alpha _2. 105 is a recording and reproducing unit for recording and reproducing a frame timing synchronized with the frame clock FCK ₂ generated by the frame timing generator 102. Reproducing unit 105 forms a track for two obliquely on the tape during one period of the frame clock FCK ₂ of 30msec period by the recording and reproducing system of the rotating head system, for recording one type of timecode 2 track units It has become. In the recording mode, the recording / reproducing unit 105 outputs the time code TC ₂ , α _{2 as it} is TC ₃ , α
Output as _3, when the reproduction mode, and outputs a time code reproduced from the tape TC _3, as alpha _3.

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

In FIG. 3, the time code TC ₂ , α ₂ is represented by 8-byte data called PACK. Pa of the 0th word
ck Item is identification data indicating the attribute of PACK.
When Item = "1100", it is defined to represent a time code. FLAG is flag data for storing the form of the input time code. For example, when FLAG = “0000”, a time code having a frame cycle of 40 msec, FLAG =
"0001" indicates a time code having a frame period of 30 msec. This flag can be referred to when outputting the time code in the same form as the time code input when reproducing and outputting the time code.

Subframe numbers 1 and 2 of the first and second words are subframe numbers obtained by further dividing the frame number.
Corresponds to the α ₂ of the time code. The 16-bit data of words 1 and 2 can be divided into four to express 0000-9999 with four digits in BCD format. Word 3 is time data expressed in two digits of BCD.
Express from 0 to 23. Word 4 expresses data from 0 to 59 by minute data expressed by two digits of BCD. Word 5 is the second data represented by 2 digits of BCD.
Express from 0 to 59. Word 6 is a frame number represented by two digits of the BCD. In order to associate a frame of 30 msec with a second, 00 to 32 in the 3n second range and 00 to 32 in the 3n + 1 second range.
Expressed as 00 to 33 (n = 0, 1, 2,..., 19) in the order of 3n + 2 seconds. The recording / reproducing unit 105 has input PCM audio data DTIN.
And outputs the recorded data as output PCM audio data DTOUT. Recording the PCM audio data is performed in response to the frame clock FCK ₂ generated by the frame timing generator 102 similarly to the time code. Further, the recording / reproducing unit 105 can give an appropriate delay to PCM audio data at the time of recording / reproducing in consideration of time code delays caused by the input time code conversion processing and the output time code conversion processing.

Output time code converter 106, output frame converter 10
7. The output frame timing generation unit 108, the output phase difference detection unit 109, and the output phase difference correction unit 110 have almost the same functions as the input-side units 100 to 104, and a description thereof will be omitted.

When connecting a plurality of recording and playback devices, if each device has the input time code conversion function as described above,
The output side time code processing is unnecessary, but when connecting to a recording / reproducing apparatus having no input time code conversion function and a different frame cycle, the output side time code conversion processing is required.

A frame clock reset flag RSTFCK 111 instructs the frame timing generator 102 and the output frame timing generator 108 to reset the frame clock.
_2. System control unit that supplies RSTFCKOUT. The frame timing generator 102 and the output frame timing generator 108 are reset when the recording / reproducing unit 105 is performing a recording or reproducing operation, or when the output time code TCOUT, α
This must be avoided when the external device to which OUT is connected is performing recording or playback.

Next, the input time code conversion processing of the time information recording / reproducing apparatus described with reference to FIG. 1 will be described in detail.

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

In FIG. 4, TCIN indicates an upper time code equal to or higher than the frame number of the input time code, αIN indicates a subframe number of the input time code, and FCKIN indicates an input frame representing the start timing of the frame of the input time code. Clock. In this case, the input time code has a period of 40 msec, the subframe number αIN keeps “0”, and the upper time code TCIN is 0:00:00.
Frames (hereinafter, units of seconds or more are omitted) continue from frame 6 to frame 9 and continue from frame 12 to 12, with a discontinuous point between frames 6 and 9. However, the phases are continuous. This is converted by the input time code conversion unit 100 into an upper time code TC ₁ having a frame period of 30 msec and a sub-frame number α _1.
It is. FCK ₁ is a frame clock 1 representing the beginning of the frame time code TC ₁ and alpha _1.

TCIN, when the time code conversion as in the second FIG αIN, TC _1, between 9 frame and 12 frames of alpha _1, with the frame is discontinuous, the frame phase is discontinuous.

RSTFCK ₂ is a frame clock reset signal for synchronizing the frame clock FCK ₁ and the frame clock FCK ₂ used for recording and reproduction.

RSTFCK ₂ is activated before the recording / reproducing unit 105 enters the recording mode, and synchronizes the frames of the input time codes TCIN, αIN with the frames of the recording / reproducing unit 105. After synchronization, T
CIN, if continuously ArufaIN, subframe number alpha ₂ for the time code after the input transformation is the same as the sub-frame number ArufaIN the incoming timecode, and becomes constant. TC
_2, alpha ₂ is a time code after the input phase difference correction, the time code TC ₁ before the phase difference correction is obtained by adding the phase difference .alpha.d ₁ to alpha _1. The time codes TC ₁ and α ₂ after the phase correction are
Until it is reset by the frame clock reset signal RSTFCK _2, the frame clock FC used for recording
Since K ₂ and the frame clock FCK ₁ are out of phase by a, the sub-frame number alpha ₂ becomes a. After FCK ₂ is reset by RSTFCK is subframe number alpha ₂ for the phase matches the FCK ₁ and FCK ₂ becomes "0". Since the frame phase becomes discontinuous at the point where the TC ₂ changes from 9 frames to 12 frames, the phase difference αd ₂ becomes b, and the sub-frame α ₂ after the phase difference correction becomes b. If the frame clock reset signal RSTFCK ₂ is activated at the point where the frame changes from 9 frames to 12 frames, the phase difference αd ₂ becomes “0”.
However, since the recording / reproducing unit 105 is in the recording mode at this time, it is not reset. FCK ₂ is the recording and playback unit
This is a frame clock that determines the frame timing of 105, and the frame phase is constant during the recording mode.

PR is a signal indicating the mode of the recording / reproducing unit. “0” indicates the reproducing mode, and “2” indicates the recording mode.

 Next, the output time code conversion processing will be described.

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

The upper time code TC ₃ and the subframe number α ₃ are time codes reproduced by the recording / reproducing unit 105. The recorded time code is recorded after the input time code conversion processing described with reference to FIG. In FIG. 5, the time codes TC ₃ and α ₃ are continuous from 4 frames to 9 frames, and the sub-frame number α ₃ is constant at “0”. The time code becomes discontinuous from the ninth frame to the twelfth frame, but the frame phase is constant. 9 Frame time code after certain sub frame number alpha ₃ is also a constant value b. FCK ₂ is the recording and playback unit 10
5 is the frame clock that determines the frame timing. Upper time code TC ₄ , subframe number α ₄
Is the time code after the output time code conversion. At the point where the time codes TC ₃ and α ₃ before the output time code conversion are discontinuous, the time codes TC ₄ and α ₄ after the output time code conversion also become discontinuous and the frame phase also becomes discontinuous. RSTFCKOUT is a frame clock reset signal for resetting the output frame timing generator 108. When RSTFCKOUT is activated, it is possible to synchronize the frame clock FCKOUT generated by the frame clock FCK ₃ and the output frame timing generating unit 108 outputs the output frame conversion unit 107. Top timecode TCOUT, ArufaOUT, the time code TC ₄ to the output of the output time code conversion unit 106, the alpha _4, by adding the phase difference .alpha.d ₄ for outputting the output phase difference detecting unit 109, the frame clock FCKOUT
Is output in synchronization with. Time code TCOUT, αOUT is 3
It is continuous up to 6 frames, discontinuous from 6 frames to 9 frames, and continuous from 9 to 12 frames. At the transition point from 6 frames to 9 frames, the frame phase is continuous. In this case, the phase difference αd ₄ output from the output phase difference detection unit becomes −b because the phase difference αd ₂ generated in the input time code conversion processing described in FIG. ₄ is b. Therefore, the output subframe αOUT becomes “0”. That is, input time code TCIN, α
When the frame cycle of IN and the output time code TCOUT, αOUT is the same, αIN = αOUT.

As described above, the time information recording / reproducing apparatus of the present invention includes a recording unit that records input information divided into frames, a recording frame timing generation unit that determines a frame phase of the recording unit, and a frame of the input information. And phase difference detecting means for detecting a phase difference between recording frames, and second input time information obtained by correcting first input time information corresponding to a head of a frame of input information or a specific timing based on the phase difference. By outputting the phase difference correction means for outputting the second input time information, and reproducing means for reproducing the recorded input information and the second input time information,
When the input information divided into frames and the corresponding time information are recorded, even if the frame phase of the input information is different from the frame phase of the recording means, the time information is recorded with the phase difference corrected. Therefore, the correspondence between the input information and the time information is stored, and the reproduction and editing of the information can be performed with higher accuracy than the frame unit. Furthermore, by providing the frame of input information and the frame phase synchronizing means of 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, and the time information frame unit or less (Subframe number) can be set to "0", which simplifies editing and cueing. For example, when the frame period of the input information is equal to the frame period of the recording unit, the input information can be associated with the time information without using a subframe number.

Further, by providing a time information conversion unit that converts a frame period of the time information corresponding to the input information, the input information having a different frame period of the input information and the frame period of the recording unit, and the corresponding time information, the input information, Since the correspondence of the time information can be stored with an accuracy of a frame unit or less, highly accurate editing can be performed between devices having any frame period.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the configuration of a time information recording / reproducing apparatus according to one embodiment of the present invention, FIG. 2 is a timing chart showing the operation of an input time code converter and an input frame converter, and FIG. FIG. 4 is a timing chart showing the timing of the input time code conversion processing, FIG. 5 is a timing chart showing the timing of the output time code conversion processing, and FIG. 6 is a conventional time information recording / reproduction. FIG. 7 is a timing chart showing a relationship between input samples and recording time codes in the apparatus, FIG. 7 is a timing chart showing conversion of continuous time codes, FIG. 8 is a timing chart showing conversion of discontinuous time codes, and FIG. Shows the relationship between input samples and recording timecode when subframe numbers are introduced Is Lee timing chart. 100 input time code conversion unit, 101 input frame conversion unit, 102 frame timing generation unit, 103 phase difference detection unit, 104 input phase difference correction unit, 105 recording / playback unit, 106 ... Output time code conversion unit, 107 output frame conversion unit, 108 output frame timing generation unit, 109 output phase difference detection unit, 110 output phase difference correction unit, 111 system control unit.

Continued on the front page (72) Inventor Masataka Nikaido 1006 Kadoma, Kazuma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. Inventor Yasushi Nakajima 1006 Kadoma, Kazuma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (72) Inventor Takafumi Ueno 1006 Odaka, Kazuma, Kadoma City, Osaka Pref. 57-58274 (JP, A)

Claims (6)

(57) [Claims] A recording means for recording input information divided into frames; a recording frame timing generating means for determining a frame phase of the recording means;
Phase difference detection means for detecting the phase difference between the frame phase of the input information and the recording frame phase using the output of the timing generation means as a reference clock; and, based on the phase difference, the beginning of a frame of the input information or a specific timing. Phase difference correcting means for outputting second time information obtained by correcting the first input time information corresponding to the input time information, wherein the recording means records the second time information together with the input information, A time information recording / reproducing apparatus comprising means for inputting and reproducing information and second time information. 2. The time information recording / reproducing apparatus according to claim 1, wherein the second time information comprises a frame number unique to each frame and a subframe number obtained by equally dividing the frame into a plurality. 3. Recording means for recording input information divided into frames, recording frame timing generating means for determining a frame phase of said recording means,
Using the output of the timing generation means as a reference clock, the beginning of the frame of the input information, or phase synchronization means for synchronizing the input time information corresponding to a specific timing with the frame phase of the recording means, and the recording means together with the input information A time information recording / reproducing apparatus comprising: means for recording time information of the phase-synchronized recording frame, and inputting and reproducing the recorded input information and time information. 4. The time information of a phase-synchronized recording frame includes a frame number unique to each frame and a subframe number obtained by equally dividing the frame into a plurality of frames.
The time information recording / reproducing device according to claim 3. 5. A recording means for recording input information divided into frames; a recording frame timing generating means for determining a frame phase of said recording means;
Time information for converting the first input time information corresponding to the head of the input information frame or the first input time information corresponding to a specific timing into second time information having a frame period different from that of the input information, using the output of the timing generation means as a reference clock Conversion means, phase difference detection means for detecting a phase difference between the frame phase of the second time information and the recording frame phase, and third time information obtained by correcting the second time information based on the phase difference. Phase difference correcting means for outputting, the recording means recording the third time information together with the input information, and inputting and reproducing the recorded input information and the third time information. A time information recording / reproducing apparatus characterized by the above-mentioned. 6. The second time information and the third time information,
6. The time information recording / reproducing apparatus according to claim 5, comprising a frame number unique to each frame and a subframe number obtained by equally dividing the frame into a plurality.