KR930007793B1 - Method of detecting tape driving speed in vtr - Google Patents

Method of detecting tape driving speed in vtr Download PDF

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Publication number
KR930007793B1
KR930007793B1 KR1019910000222A KR910000222A KR930007793B1 KR 930007793 B1 KR930007793 B1 KR 930007793B1 KR 1019910000222 A KR1019910000222 A KR 1019910000222A KR 910000222 A KR910000222 A KR 910000222A KR 930007793 B1 KR930007793 B1 KR 930007793B1
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South Korea
Prior art keywords
speed
tape
slp
playback
capstan
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KR1019910000222A
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Korean (ko)
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KR920015318A (en
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배태석
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삼성전자 주식회사
강진구
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Priority to KR1019910000222A priority Critical patent/KR930007793B1/en
Priority to DE4200359A priority patent/DE4200359A1/en
Priority to GB9200372A priority patent/GB2252864B/en
Priority to JP4002425A priority patent/JP2655775B2/en
Publication of KR920015318A publication Critical patent/KR920015318A/en
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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/18—Driving; Starting; Stopping; Arrangements for control or regulation thereof
    • G11B15/46—Controlling, regulating, or indicating speed
    • G11B15/467—Controlling, regulating, or indicating speed in arrangements for recording or reproducing wherein both record carriers and heads are driven
    • G11B15/4673—Controlling, regulating, or indicating speed in arrangements for recording or reproducing wherein both record carriers and heads are driven by controlling the speed of the tape while the head is rotating
    • G11B15/4675—Controlling, regulating, or indicating speed in arrangements for recording or reproducing wherein both record carriers and heads are driven by controlling the speed of the tape while the head is rotating with provision for information tracking
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/02—Control of operating function, e.g. switching from recording to reproducing
    • G11B15/05—Control of operating function, e.g. switching from recording to reproducing by sensing features present on or derived from record carrier or container
    • G11B15/087—Control of operating function, e.g. switching from recording to reproducing by sensing features present on or derived from record carrier or container by sensing recorded signals

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  • Television Signal Processing For Recording (AREA)
  • Indexing, Searching, Synchronizing, And The Amount Of Synchronization Travel Of Record Carriers (AREA)

Abstract

The method detects the exact running speed of a video tape in a slowmode by comparing capstern frequency pulse signal with control pulse signal. The method includes the steps of: (A) comparing numbers of capstern pulse with control pulse; (B) finding that current speed is the same as the recording speed when two numbers are identical; (C) counting capstern frequency pulse to detect the tape speed when reproducing speed is not the same as the tape speed and current mode is SLP; and (D) detecting tape speed repeatedly after changing current mode to SLP when current mode is SP of SLP.

Description

비디오 테이프레코더의 테이프속도 판별방법How to determine the tape speed of a video tape recorder

제1도는 비디오 테이프레코더의 간차슬로우동작을 설명하기 위한 신호파형도.1 is a signal waveform diagram for explaining a gap slow operation of a video tape recorder.

제2도는 제1도의 부분확대도.2 is a partial enlarged view of FIG.

제3도는 본 발명에 따른 테이프속도 판별장치의 블럭다이어그램.3 is a block diagram of a tape speed discrimination apparatus according to the present invention.

제4도는 본 발명을 수행하기 위한 제어플로우챠트이다.4 is a control flowchart for carrying out the present invention.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

1 : 제어헤드 2 : 서보장치1: control head 2: servo device

3 : 캡스턴모터 4 : 캡스턴 주파수발생기3: capstan motor 4: capstan frequency generator

5 : 캡스턴 모터구동기 6 : 마이컴5: capstan motor driver 6: microcomputer

본 발명의 비디오 테이프레코더의 슬로우재생중 비디오 테이프의 이동시에 발생되는 캡스턴 주파수신호와 제어펄스의 갯수를 비교하여 슬로우 재생중에도 테이프 재생속도를 판별하기 위한 비디오 테이프레코더의 테이프속도 판별방법에 관한 것이다.The present invention relates to a tape speed discrimination method of a video tape recorder for determining a tape playback speed during slow playback by comparing the number of capstan frequency signals generated when the video tape moves during the slow playback of the video tape recorder and the number of control pulses.

일반적인 간차슬로우 방식을 채택한 비디오 테이프레코더의 슬로우 재생중에 비디오 테이프상의 속도(녹화할때 선택되었던 속도)가 변할경우 속도판별이 안되어 기록되었던 속도와 다른 속도로 재생됨에 따라 재생되는 비디오 신호의 무너짐(다른 속도로 제어되므로 동기가 맞지않음) 현상이 발생하는 문제점이 있었던 바, 종래의 간차 슬로우 동작을 제1도를 참조하여 개략적으로 설명한다.If the speed on the video tape (the speed selected when recording) changes during slow playback of a video tape recorder that adopts the common gap-slow method, the video signal that is played back at the speed different from the recorded speed cannot be detected. As a result of this problem, there is a problem in that synchronization occurs due to speed control. Thus, a conventional slow motion operation will be briefly described with reference to FIG.

제1도는 비디오 테이프레코더를

Figure kpo00002
기점에서 재생모드를 수행한후
Figure kpo00003
에서 스틸모드를 수행하고,
Figure kpo00004
에서 재생모드를
Figure kpo00005
에서 스틸모드를 수행하기 위한 것인바, 헤드스위칭신호의 1주기에 1프레임(텔레비젼의 화면 1장)의 화면이 구성되므로 1장의 재생화면과 4장의 스틸화면 연속 표시로서 슬로우재생이 구현되어 재생모드의 1/5속도로 슬로우재생이 된다.Figure 1 shows the videotape recorder
Figure kpo00002
After playing from the starting point
Figure kpo00003
In Still mode,
Figure kpo00004
In playback mode
Figure kpo00005
In order to perform the still mode in the screen, one frame (one TV screen) is composed of one frame of the head switching signal. Slow playback at 1/5 speed of.

제2도에 도시한 바와같이 ⓐ지점은 재생시이고 ⓑ지점은 스틸을 위한 헤드 스위칭 신호를 표시하는바, 캡스턴 모터 가속구간 ⓒ에 의하여 실제 테이프의 진행은 ⓐ에서 행해지게 되고, 모터의 강제 정지구간 ⓓ에 의해서 실제 테이프의 정지는 ⓑ에서 이루어지게 된다. 여기에서 ⓔ는 재생상태의 제어구간으로 ⓒ, ⓓ, ⓔ에 의해서 ⓐ-ⓩ사이의 구간에서 재생모드가 수행된다. 또한 ⓕ는 제어펄스 입력후 테이프 정지까지의 시간으로서, 테이프속도에 따라 제어펄스가 나온후 테이프의 정지가 이루어져야 할 거리가 다르다. 즉 왜냐하면 테이프의 진행량은 SP＞LP＞SLP이기 때문이다. 결국, 재생속도가 SP인데 테이프가 SLP이면 ⓕ의 시간이 다르게 되어 동기가 무너지게 되는바, 여기에서 ⓕ의 시간은 설계조건에 따라 각각의 속도별로 다르게 되는데 제2도 ⓐ-ⓑ구간에 발생되는 캡스턴 주파수와 제어펄스는 테이프의 속도와 재생속도가 동일할 경우에는 하기의 표-I과 같이 재생과 동일하게 발생된다.As shown in Fig. 2, the point ⓐ is at the time of regeneration and the point ⓑ indicates the head switching signal for the steel, and the actual tape progression is performed at ⓐ by the capstan motor acceleration section ⓒ, and the forced stop section of the motor. By ⓓ, the actual tape stops at ⓑ. Here, ⓔ is a control section of the playback state, and the playback mode is performed in the section between ⓐ-ⓩ by ⓒ, ⓓ, ⓔ. Also, ⓕ is the time from the control pulse input to the tape stop, and the distance to stop the tape after the control pulse comes out according to the tape speed. That is, because the advancing amount of the tape is SP> LP> SLP. Eventually, if the playback speed is SP but the tape is SLP, the time of ⓕ is different and the synchronization is broken. Here, the time of ⓕ is different for each speed according to the design conditions. When the capstan frequency and the control pulse are the same as the tape speed and the playback speed, the capstan frequency and the control pulse are generated in the same manner as the playback as shown in Table-I below.

모드에 따른 캡스턴 주파수 펄스개수Number of capstan frequency pulses by mode

[표 1]TABLE 1

Figure kpo00006
Figure kpo00006

그러나, 재생속도와 테이프 속도가 다를 경우에는 하기와 같이 캡스턴 주파수 펄스가 발생한다.However, when the reproduction speed and the tape speed are different, capstan frequency pulses occur as follows.

우선, 재생속도가 테이프의 속도보다 빠를 경우에는 하기의 표-Ⅱ와 같은 결과가 예상된다.First, when the playback speed is faster than that of the tape, the results as shown in Table II below are expected.

모드에 따른 캡스턴 주파수 펄스개수Number of capstan frequency pulses by mode

[표 2]TABLE 2

Figure kpo00007
Figure kpo00007

표-2의 경우 제2도의 ⓕ가 실제 요구되는 ⓕ보다 크므로 재생구간에서 제어펄스 1구간보다 많은 테이프의 진행이 이루어지게 되어 캡스턴 주파수 펄스가 일정하지 않게 되어 동기가 무너지게 된다.In the case of Table 2, since ⓕ of FIG. 2 is larger than ⓕ actually required, more tapes proceed in the playback section than in the control pulse section, and the capstan frequency pulse is not constant.

그러나, 재생속도가 테이프속도보다 늦을 경우 하기의 표-3와 같은 결과가 예상된다.However, when the playback speed is slower than the tape speed, the results as shown in Table 3 below are expected.

재생속도 ＜ 테이프속도Playback speed ＜ Tape speed

[표 3]TABLE 3

Figure kpo00008
Figure kpo00008

상기의 표-3에 도시한 것으로부터 알 수 있는 바와같이, ⓕ가 실제 요구되는 ⓕ보다 작으므로 다음 단계의 재생구간 진행시 ⓖ의 구간이 길어지게 되어 ⓖ+ⓕ는 제어펄스의 1구간에 해당되므로 표-I에 도시한 캡스턴 주파수 펄스가 얻어질 수 있음을 알 수 있다.As can be seen from Table 3 above, since ⓕ is smaller than the required ⓕ, the interval of ⓖ becomes longer during the regeneration section of the next step, and ⓖ + ⓕ corresponds to one section of the control pulse. Therefore, it can be seen that the capstan frequency pulse shown in Table-I can be obtained.

재생속도가 테이프속보다 빠를경우에는 반드시 동기가 무너지게 된다는 결론에 도달하게 되는바, 본 발명은 재생속도가 판별이 가능함을 착안하여 슬로우재생시 비디오 테이프레코더의 테이프속도를 판별하기 위한 방법을 제공하는데 그 목적이 있다.When the playback speed is faster than the tape, it is concluded that the synchronization is necessarily collapsed. The present invention provides a method for determining the tape speed of a video tape recorder during slow playback in view of the fact that the playback speed can be determined. Its purpose is to.

이러한 목적을 달성하기 위해서 본 발명은 현재의 재생속도와 테이프속도가 동일한지를 판단하고, 현재의 재생속도가 SLP일경우 테이프속도를 캡스턴 주파수갯수로서 판별하고, 재생속도가 LP나 SP일경우에는 SLP로 재생속도를 변환한뒤 속도판별을 하도록 하였다.In order to achieve this object, the present invention determines whether the current playback speed and the tape speed are the same, and determines the tape speed as the number of capstan frequencies when the current playback speed is SLP, and SLP when the playback speed is LP or SP. After converting the playback speed to speed discrimination.

이하, 본 발명을 첨부된 도면에 의거하여 상세히 설명하면 다음과 같다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

제3도는 본 발명에 따른 비디오 테이프레코더의 재생속도 판넬 방법을 구현하기 위한 하드웨어 구성도인 바, 제어헤드(1)에 의해서 비디오 테이프(도시하지 않았음)로 부터 읽혀진 제어펄스는 서보장치(2)에 제공되고, 또한 캡스턴 모터(3)의 회전시 캡스턴 주파수 발생기(4)에 의해 발생된 캡스턴 주파수로 서보장치(2)에 제공된다.3 is a hardware diagram for implementing a method of reproducing a speed of a video tape recorder according to the present invention. The control pulse read from a video tape (not shown) by the control head 1 is a servo device (2). And the capstan frequency generated by the capstan frequency generator 4 at the time of rotation of the capstan motor 3.

이때 서보장치(2)는 캡스턴 모터구동기(5)에 신호를 제공함과 동시에 제어펄스와 캡스턴 주파수를 마이컴(6)에 전달한다. 그러면 마이컴(6)은 캡스턴 모터구동기(5)를 작동시켜 캡스턴모터(3)로 하여금 테이프를 진행시키도록 하고, 서보장치(2)에는 데이터신호를 제공하여 제4도와 같은 제어플로우챠트에 따라 테이프 속도를 판별하게 되는바, 이에 대해 상세히 설명한다.At this time, the servo device 2 provides a signal to the capstan motor driver 5 and simultaneously transmits a control pulse and capstan frequency to the microcomputer 6. Then, the microcomputer 6 operates the capstan motor driver 5 to cause the capstan motor 3 to advance the tape, and provides the servo device 2 with a data signal in accordance with the control flowchart as shown in FIG. Since the speed is determined, this will be described in detail.

테이프를 재생하는 도중에 슬로우재생이 시작될경우(스텝101), 마이컴(6)은 현재의 재생속도와 테이프의 속도가 일치하는가를 전술한 표-1과 같이 판단한다. 만약에 현재의 재생속도가 SP 모드일경우(스텝102), 마이컴(6)은 캡스턴 주파수 갯수가 36개인가를 판단하여(스텝103), 주파수갯수가 36개일경우에는 테이프속도를 SP모드로 하면서 계속 다음의 비교를 위해 스텝 102로 복귀시키고, 캡스턴 갯수가 36개가 아닐경우에는 재생속도를 SLP 모드로 변환시킨다(스텝104).If slow playback starts while the tape is being played back (step 101), the microcomputer 6 determines whether the current playback speed and the tape speed match as shown in Table-1 above. If the current playback speed is in the SP mode (step 102), the microcomputer 6 determines whether the number of capstan frequencies is 36 (step 103), and if the frequency is 36, the tape speed is kept in the SP mode. If the number of capstans is not 36, the playback speed is changed to the SLP mode (step 104).

한편, 현재의 재생속도가 SP 모드가 아닐경우에는 프로그램은 스텝(102)에서 스텝(105)으로 진행되어 재생속도가 LP 모드인가를 판별하는바, 재생속도가 LP 모드이면 마이컴은 주파수 갯수를 카운트하여(스텝106), 그의 갯수가 18개이면 테이프속도를 LP로 유지하면서 스텝102로 복귀시키고, 그렇지 않을경우에는 재생속도를 SLP 모드로 변환하도록 프로그램은 스텝(106)에서 스텝(104)으로 진행된다.On the other hand, if the current playback speed is not the SP mode, the program proceeds from step 102 to step 105 to determine whether the playback speed is the LP mode. If the playback speed is the LP mode, the microcomputer counts the number of frequencies. (Step 106), if the number thereof is 18, the program returns to Step 102 while maintaining the tape speed at LP, otherwise the program proceeds from Step 106 to Step 104 to convert the playback speed to SLP mode. do.

그러나, 현재의 재생속도가 SLP일경우(스텝107) 마이컴이 캡스턴 주파수가 몇개 입력되었는가를 카운트하도록 프로그램은 스텝(107)에서 스텝(108)으로 진행된다. 스텝(107)과 스텝(104)에서 프로그램이 스텝(108)으로 진행되면 마이컴(6)은 주파수가 몇개인지를 감지하여 12개일경우에는 SLP 모드로서 판별한후 스텝102로 복귀되고, 12개가 아닐경우에는 프로그램은 스텝(109)으로 진행된다. 그런데 주파수 갯수가 18개이면 마이컴(6)은 재생속도를 LP로 간주하고(스텝110), 주파수 갯수가 18개가 아닐경우에는 프로그램은 스텝(111)으로 진행되어 다시 주파수가 36개인가를 판별하여 36개일경우에는 재생속도가 SP 모드임을 판단한다(스텝112). 그러나 외부의 요인에 기인하여 주파수 갯수가 36개가 아닌경우에는 다시 주파수 갯수를 카운팅하도록 프로그램은 스텝(11)에서 스텝(108)으로 복귀되어 전술한 과정을 반복한다.However, if the current playback speed is SLP (step 107), the program proceeds from step 107 to step 108 so that the microcomputer counts how many capstan frequencies have been input. If the program proceeds to step 108 in step 107 and step 104, the microcomputer 6 detects how many frequencies there are, and if there are 12, determines as SLP mode and returns to step 102. In this case, the program proceeds to step 109. However, if the number of frequencies is 18, the microcomputer 6 regards the playback speed as LP (step 110). If the number is not 18, the program proceeds to step 111 to determine whether the frequency is 36 again. In the case of a dog, it is determined that the playback speed is the SP mode (step 112). However, if the number of frequencies is not 36 due to external factors, the program returns from step 11 to step 108 to repeat the above-described process to count the frequency again.

이와같이 동작하는 본 발명은 간차슬로우재생중 테이프의 이동시 발생되는 캡스턴 주파수펄스의 갯수를 비교하여 슬로우 재생중에도 테이프속도를 용이하게 판별할 수 있으므로 선명한 화면을 시청할 수 있는 특징을 지닌 것이다.The present invention operating as described above has the feature that the tape speed can be easily determined during the slow playback by comparing the number of capstan frequency pulses generated when the tape is moved during the slow playback, and thus, a clear screen can be viewed.

Claims (1)

제어펄스의 갯수와 캡스턴 주파수 갯수를 비교하되, 제어 펄스의 갯수와 캡스턴 주파수 펄스 갯수가 동일한 경우에는 현재의 재생속도가 테이프속도와 동일한 것으로 판별하고 ; 현재의 재생속도가 테이프속도와 동일하지 않을 경우 재생속도가 SLP 모드이면 캡스턴 주파수 펄스가 몇개 입력되는가를 계수하여 테이프속도를 판별하며 ; 현재 재생속도가 SP 또는 LP 모드이면 재생속도를 SLP로 변환한후 반복하여 테이프속도를 판별하는 단계를 포함함을 특징으로 하는 비디오 테이프레코더의 테이프속도 판별방법.Compare the number of control pulses with the number of capstan frequencies, and if the number of control pulses and the number of capstan frequency pulses are the same, determine that the current playback speed is the same as the tape speed; If the current playback speed is not the same as the tape speed, the tape speed is determined by counting how many capstan frequency pulses are input when the playback speed is the SLP mode; If the current playback speed is in SP or LP mode, converting the playback speed to SLP and repeatedly determining the tape speed.
KR1019910000222A 1991-01-09 1991-01-09 Method of detecting tape driving speed in vtr KR930007793B1 (en)

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Application Number Priority Date Filing Date Title
KR1019910000222A KR930007793B1 (en) 1991-01-09 1991-01-09 Method of detecting tape driving speed in vtr
DE4200359A DE4200359A1 (en) 1991-01-09 1992-01-09 DEVICE AND METHOD FOR CHANGING THE VIDEO TAPE SPEED IN A VIDEO TAPE RECORDER
GB9200372A GB2252864B (en) 1991-01-09 1992-01-09 Converting tape speed
JP4002425A JP2655775B2 (en) 1991-01-09 1992-01-09 Apparatus and method for controlling tape speed of video tape recorder

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KR1019910000222A KR930007793B1 (en) 1991-01-09 1991-01-09 Method of detecting tape driving speed in vtr

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KR930007793B1 true KR930007793B1 (en) 1993-08-19

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AT322642B (en) * 1973-08-01 1975-05-26 Philips Nv RECORDING AND PLAYBACK DEVICE
JPS5062008A (en) * 1973-10-01 1975-05-27
DE2803538C2 (en) * 1978-01-27 1982-11-25 Blaupunkt-Werke Gmbh, 3200 Hildesheim Image recording device
JPS5928267A (en) * 1982-08-09 1984-02-14 Nec Corp Compressing and extending device of program play time
US4679098A (en) * 1982-09-17 1987-07-07 Ampex Corporation Video tape transport servo for variable tape speed control
US4594618A (en) * 1982-12-24 1986-06-10 Canon Kabushiki Kaisha Information reproducing apparatus
JPS60140555A (en) * 1983-12-27 1985-07-25 Matsushita Electric Ind Co Ltd Automatic discriminating circuit
CA1270946A (en) * 1985-07-23 1990-06-26 Mitsugu Yoshihiro Capstan servo circuit
JPS63241743A (en) * 1987-03-28 1988-10-07 Toshiba Corp Recording speed discriminating device
JPS63304455A (en) * 1987-06-04 1988-12-12 Matsushita Electric Ind Co Ltd Setting device for tape traveling speed of magnetic recording and reproducing device

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DE4200359A1 (en) 1992-07-16
GB2252864B (en) 1994-11-30
KR920015318A (en) 1992-08-26
GB2252864A (en) 1992-08-19
JP2655775B2 (en) 1997-09-24
JPH06168504A (en) 1994-06-14
GB9200372D0 (en) 1992-02-26

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