JPS6324785A - Video tape recorder - Google Patents
Video tape recorderInfo
- Publication number
- JPS6324785A JPS6324785A JP61168449A JP16844986A JPS6324785A JP S6324785 A JPS6324785 A JP S6324785A JP 61168449 A JP61168449 A JP 61168449A JP 16844986 A JP16844986 A JP 16844986A JP S6324785 A JPS6324785 A JP S6324785A
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- JP
- Japan
- Prior art keywords
- frequency
- circuit
- signal
- frequency conversion
- output signal
- Prior art date
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 43
- 230000010355 oscillation Effects 0.000 claims description 24
- 239000013078 crystal Substances 0.000 abstract description 2
- 230000007704 transition Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000010363 phase shift Effects 0.000 description 2
- 239000000284 extract Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Abstract
Description
【発明の詳細な説明】
（イ）産業上の利用分野
本発明は、ホーム用ＶＴＲ（ビデオテープレコーダ）に
関するもので、特にＩＣ（集積回路）化に適した低域変
換回路を備えるＶＴＲに関する。DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a home VTR (video tape recorder), and particularly to a VTR equipped with a low frequency conversion circuit suitable for integration into an IC (integrated circuit).
（ロ）従来の技術
３ 、５８ ＭＨｚの搬送色信号を７００ ＫＨ２付近
の低域に変換して記録を行なうＶＴＲの低域変換回路が
、実願昭６０−１７４３６４号に記載されている。前記
低域変換回路は、例えば第２図の如きものである。第２
図において、端子（１）に入力されるカラー映像信号中
の搬送色信号ｒ、は、バンドパスフィルタ（２）を介し
て、第１周波数変換回路（３）及びパーストゲート回路
（４）に印加される。(b) Prior Art 3 A low frequency conversion circuit for a VTR which performs recording by converting a 58 MHz carrier color signal to a low frequency around 700 KH2 is described in U.S. Pat. No. 60-174364. The low frequency conversion circuit is, for example, as shown in FIG. Second
In the figure, a carrier color signal r in a color video signal input to a terminal (1) is applied to a first frequency conversion circuit (3) and a burst gate circuit (4) via a bandpass filter (2). be done.
パーストゲート回路（４）は、前記搬送色信号中のバー
スト信号を抽出するもので、抽出されたバースト信号は
位相比較回路（５）に印加きれる。位相比較回路（５）
は、ｖｘｏｃ水晶電圧制御発振器）（６）から印加きれ
る３ 、 ５８ ＭＨｚの連続波ｒ、と、前記バースト
信号との位相比較を行ない、その差に応じた直ＮＣ電工
で前記Ｖ Ｘ Ｏ（６）の発振周波数の制御を行なう。The burst gate circuit (4) extracts the burst signal from the carrier color signal, and the extracted burst signal is applied to the phase comparator circuit (5). Phase comparison circuit (5)
The phase of the continuous wave r of 3,58 MHz applied from the VXOC crystal voltage controlled oscillator (6) is compared with the burst signal, and the V ) oscillation frequency is controlled.
そのため、Ｖ Ｘ Ｏ（６）の発振出力信号は、前記バ
ースト信号に同期し、その発振出力信号ｆ、が第２周波
数変換回路（７）に印加きれる。又、端子（８）から水
平同期信号がＰＬＬ（フェーズ・ロックド・ループ）逓
倍回路（９）に印加され、前記水平同期信号の一定倍数
の周波数の信号ｆ’ ＳＬ（６２９ＫＨｚ）が、位相推
移回路（１０）を介して第２周波数変換回路（７）に印
加される。このため、第２周波数変換回路（７）からｆ
、±ｆ’ｉＬの信号が、Ｂ Ｐ Ｆ（１１）に印加され
、ｆ’ｓ＋ｆｓｔの信号のみが抽出きれ第１周波数変換
回路（３）に印加されろ。そのため、第１周波数変換回
路（３）の出力には、ｒ、±（ｆｓ＋ｆｓＬ）の信号が
発生し、該信号がＬＰＦ（ローパスフィルタ） （１２
）に印加され、ｆ’ｓｔの信号のみが端子（１３）に取
り出される。Therefore, the oscillation output signal of the V X O (6) is synchronized with the burst signal, and the oscillation output signal f is applied to the second frequency conversion circuit (7). Further, a horizontal synchronizing signal is applied from a terminal (8) to a PLL (phase locked loop) multiplier circuit (9), and a signal f'SL (629 KHz) having a frequency that is a fixed multiple of the horizontal synchronizing signal is applied to a phase shift circuit. (10) is applied to the second frequency conversion circuit (7). Therefore, from the second frequency conversion circuit (7)
, ±f'iL are applied to the B P F (11), and only the signal f's+fst is extracted and applied to the first frequency conversion circuit (3). Therefore, a signal r, ±(fs+fsL) is generated at the output of the first frequency conversion circuit (3), and this signal is an LPF (low pass filter) (12
), and only the f'st signal is taken out to the terminal (13).
従って、第２図の回路によれば、３．５８ＭＨ。Therefore, according to the circuit of FIG. 2, 3.58 MH.
の搬送色信号を６２９ＫＨｚの低域変換色信号に変換す
ることが出来る。It is possible to convert a carrier color signal of 629 KHz into a low frequency conversion color signal of 629 KHz.
くハ）発明が解決しようとする問題点
しかしながら、第２図の回路においては第２周波数変換
回路＜７）の２つの出力信号の周波数がｒ５±ｆ’ｓＬ
、すなわち、４．２１Ｍ）１．及び２．９５Ｍトと比較
的近い値のため、その判別にはＱの高いＢＰＦ（１１）
が必要となる。一般にその様なバンドパスフィルタはＩ
Ｃ内に内蔵することが難しい。c) Problem to be solved by the invention However, in the circuit shown in Fig. 2, the frequencies of the two output signals of the second frequency conversion circuit <7) are r5±f'sL.
, i.e. 4.21M)1. and 2.95M, which are relatively close to each other, so BPF (11) with a high Q is used to distinguish between
Is required. Generally, such a bandpass filter is I
It is difficult to incorporate it into C.
その為、外付部品数の増加、ビン数の増加を招きＩＣ化
に際して好ましくないという問題があった。Therefore, there was a problem that the number of external parts and the number of bins increased, which was undesirable when integrated into an IC.
り二）問題点を解決するだめの手段
本発明は、上述の点に鑑み成きれたもので、映像信号中
の搬送色信号を低域変換色信号に変換する第１周波数変
換回路を備えるビデオテープレコーダにおいて、前記搬
送色信号と前記低域変換色信号との和の周波数に応じた
信号を前記第１周波数変換回路に印加する■Ｃｏと、所
定周波数で発振する発振回路と、前記ＶＣＯ及び前記発
振回路の発振出力信号が印加きれる第２周波数変換回路
と、ＬＰＦを介して印加される前記第２周波数変換回路
の出力信号と前記映像信号中の水平同期信号との位相比
較を行ない、その出力信号で前記ＶＣＯの発振出力信号
を制御する位相比較回路とを備えていることを特徴とす
る。2) Means for Solving the Problems The present invention has been accomplished in view of the above-mentioned points, and provides a video signal including a first frequency conversion circuit for converting a carrier color signal in a video signal into a low frequency conversion color signal. In the tape recorder, ■Co applies a signal corresponding to the frequency of the sum of the carrier color signal and the low frequency conversion color signal to the first frequency conversion circuit, an oscillation circuit that oscillates at a predetermined frequency, the VCO and A second frequency conversion circuit to which the oscillation output signal of the oscillation circuit is fully applied, and a phase comparison between the output signal of the second frequency conversion circuit applied via the LPF and the horizontal synchronization signal in the video signal, The present invention is characterized by comprising a phase comparator circuit that controls the oscillation output signal of the VCO using an output signal.
（本）作用
本発明によれば、搬送色信号と低域変換色信号との和の
周波数で発振するＶＣＯを用いて周波数変換を行なうこ
とが出来るので、前記ｖＣＯと第１周波数変換回路との
間にＢＰＦを挿入する必要がない。(Main) Effect According to the present invention, frequency conversion can be performed using a VCO that oscillates at a frequency that is the sum of a carrier color signal and a low-frequency conversion color signal, so that the VCO and the first frequency conversion circuit can be connected to each other. There is no need to insert a BPF in between.
（へ〉実施例
第１図は、本発明の一実施例を示す回路図で、（１４）
は３ 、５８ＭＨ２（７）搬送色信号ｆ’５（７）周波
数のＡ倍で発振するＶＸＯ，（１５）は該Ｖ Ｘ Ｏ（
１４）（７）発振出力信号Ａ ” ｆ ｓが１／Ａ分周
回路（１６）を介して印加きれるとともに、パーストゲ
ート回路（４）からバースト信号が印加妨れ、その位相
差に応じた直流電圧でＶ Ｘ Ｏ（１４）の発振出力信
号を制御する第１位相比較回路、（１７）は３ 、５８
ＭＨｚの搬送色信号ｒ、及び６２９ＫＨｚの低域変換
色信号ｒｓＬの和の周波数のＢ倍で発振するＶＣＯｌ（
１８）は該Ｖ ＣＯ（１７）（７）発振出力信号Ｂ ・
（ｆ’ｓ＋ ｆ’ｓｔ）が１／Ｃ分周回路（１９）を介
して印加されるとともに、Ｖ Ｘ Ｏ（１４）からＡ”
ｒｓの発振出力信号が印加きれる第２周波数変換回路、
〈２０）は該第２周波数変換回路（１８）の２つの出力
信号（Ａ ｆ’ ｓ±Ｂ／Ｃ・（ｆ ｓ＋ ｆ’ ｓｔ
） ）のうち、Ａ ｆ’、−Ｂ／Ｃ−（ｆ ｓ＋ ｆ’
ＳＬ）の信号を選択出力するＬＰＦ、及び（２１）は
端子（８）から水平同期信号が印加されるとともに、Ｌ
ＰＦ（２０）の出力信号が１／Ｄ分周回路（２２）を介
して印加芒れ、その位相差に応じた直流電圧でＶ ＣＯ
（１７）の発振出力信号を制御する第２位相比較回路で
ある。(f> Example) FIG. 1 is a circuit diagram showing an example of the present invention, (14)
is 3, 58MH2 (7) is a VXO that oscillates at A times the carrier color signal f'5 (7) frequency, (15) is the V
14) (7) At the same time that the oscillation output signal A''fs is applied through the 1/A frequency divider circuit (16), the burst signal from the burst gate circuit (4) is interrupted, and a DC signal is generated according to the phase difference. The first phase comparator circuit that controls the oscillation output signal of VXO (14) with voltage, (17) is 3,58
A VCOl (
18) is the corresponding V CO (17) (7) oscillation output signal B.
(f's+f'st) is applied via the 1/C frequency divider circuit (19), and A'' is applied from V X O (14).
a second frequency conversion circuit to which an oscillation output signal of rs can be applied;
<20) is the two output signals (A f' s±B/C・(f s+ f' st
)), A f', -B/C-(f s+ f'
The LPF (21) selectively outputs the signal of SL), and the horizontal synchronizing signal is applied from the terminal (8).
The output signal of the PF (20) is applied via the 1/D frequency dividing circuit (22), and the DC voltage corresponding to the phase difference is applied to VCO.
(17) A second phase comparator circuit that controls the oscillation output signal.
尚、第１図において、第２図と同一の回路素子について
は同一の信号を付し、その説明は省略する。又、前記Ａ
、Ｂ、Ｃは整数とする。In FIG. 1, the same signals are assigned to the same circuit elements as in FIG. 2, and the explanation thereof will be omitted. Also, the above A
, B, and C are integers.
次に動作について説明する。端子（１）からのカラー映
像信号中の搬送色信号ｒ、は、バンドパスフィルタ（２
）を介して第１周波数変換回路（３）及びパーストゲー
ト回路（４）に印加される。パーストゲート回路（４）
は、前記搬送色信号ｆ、中のパースト信号を通過させ、
第１位相比較回路（１５）に印加する。前記搬送色信号
ｆ、のＡ倍の周波数で発振するＶ Ｘ Ｏ（１４）（７
）発振出力信号Ａ−ｒ、は１／Ａ分周回路（１６）に印
加され分周されて、ｆｓの信号となり第１位相比較回路
（１５）に印加きれる。そして、第１位相比較回路（１
５）において前記バースト信号と前記ｒ、の信号との位
相比較が行なわれ、その位相差に応じた直流電圧が、Ｖ
Ｘ Ｏ（１４）に帰還きれる。このため、前記バース
ト信号のＡ倍の周波数の信号に同期した、Ｖ Ｘ Ｏ（
１４）の発振出力信号Ａ ’ ｆ’ ｓが第２周波数変
換回路（１８）に得られる。Next, the operation will be explained. The carrier color signal r in the color video signal from the terminal (1) is passed through a bandpass filter (2
) is applied to the first frequency conversion circuit (3) and the burst gate circuit (4). Purst gate circuit (4)
passes the burst signal in the carrier color signal f,
The voltage is applied to the first phase comparison circuit (15). VXO(14)(7) oscillates at a frequency A times the carrier color signal f.
) The oscillation output signal A-r is applied to the 1/A frequency divider circuit (16) and frequency-divided to become an fs signal, which is applied to the first phase comparator circuit (15). Then, the first phase comparator circuit (1
In step 5), the burst signal and the signal r are compared in phase, and the DC voltage according to the phase difference is V.
I can return to X O (14). Therefore, V X O(
The oscillation output signal A'f's of 14) is obtained by the second frequency conversion circuit (18).
一方、搬送色信号ｒ、及び低域変換色信号ｆ’ｓｔの和
の周波数のＢ倍で発振するＶ ＣＯ（１７）の発振出力
信号Ｂ （ｆｓ十ｆｓｔ）は、１／Ｃ分周回路（１９）
に印加され分周されて、Ｂ／ Ｃｌ ｆ’ ｓ ＋ ｆ
’ ｓ＋、）の信号となり第２周波数変換回路（１８）
に印加きれる。第２周波数変換回路（１８）の出力には
、印加された２つの信号の和と差の周波数の信号が現わ
れるので、その出力にはＡ−ｆ、±Ｂ／ Ｃ・（ｆ ｓ
＋ ｆ’ＳＬ）の信号が発生する。ここで、分周回路の
分周比をＡ＝＝１、Ｂ＝Ｃ＝４、Ｄ＝４０とすると、第
２周波数変換回路（１８）の出力信号としてｒ、±（ｆ
ｓ＋ ｆ’ ｓｔ）の２つの信号が発生し、Ｌ Ｐ
Ｆ （２０）を介してｆ’ｓＬの信号が１／Ｄ分周回路
（２２）に印加される。そして、１／ ４０ ｆ’ ５
ｔ（７）信号（１／４０ｆ’ｓＬΦ１５ 、７４ＫＨｚ
）が第２位相比較回路（２１）に印加され、基準信号と
なる水平同期信号と位相比較され、その位相差に応じた
直流電圧がＶＣＯ（１７）に帰還される。このため、第
２位相比較回路（２１）の２つの入力信号の位相が一致
する様にＶＣＯ（１７）は制御される。そして、前記発
振出力信号４ （ｆ ｓ＋ ｆ’ｓｔ）は１／Ｂ分周回
路（２３）に印加され、１／４分周されて（ｆ’ｓ＋ｆ
ｓｔ）の信号が、位相推移回路（２４）を介して第１周
波数変換回路（３）に印加きれる。そのため、第１周波
数変換回路（３）の出力には（ｆｓ＋ｆ’ｓｔ）±ｆ、
の信号が現われ、ｒｓＬの信号のみがＩ、 Ｐ Ｆ （
１２）を通過する。On the other hand, the oscillation output signal B (fs + fst) of the V CO (17), which oscillates at a frequency B times the sum of the carrier color signal r and the low-frequency conversion color signal f'st, is generated by the 1/C frequency dividing circuit ( 19)
B/Cl f' s + f
' s+, ) becomes the signal and the second frequency conversion circuit (18)
can be applied completely. At the output of the second frequency conversion circuit (18), a signal with the frequency of the sum and difference of the two applied signals appears, so the output has A-f, ±B/C・(f s
+f'SL) signal is generated. Here, if the frequency division ratio of the frequency dividing circuit is A==1, B=C=4, and D=40, the output signals of the second frequency conversion circuit (18) are r, ±(f
s + f' st) are generated, and L P
The f'sL signal is applied to the 1/D frequency divider circuit (22) via F (20). And 1/40 f' 5
t(7) signal (1/40f'sLΦ15, 74KHz
) is applied to the second phase comparator circuit (21), the phase is compared with the horizontal synchronizing signal serving as the reference signal, and a DC voltage corresponding to the phase difference is fed back to the VCO (17). Therefore, the VCO (17) is controlled so that the phases of the two input signals of the second phase comparison circuit (21) match. Then, the oscillation output signal 4 (f s + f'st) is applied to the 1/B frequency divider circuit (23), and is frequency-divided by 1/4 (f's + f'st).
st) is applied to the first frequency conversion circuit (3) via the phase shift circuit (24). Therefore, the output of the first frequency conversion circuit (3) is (fs+f'st)±f,
, and only the rsL signal appears as I, P F (
12).
その結果、端子（１３）には３．５８Ｍ）１２の搬送色
信号ｆ、を低域変換することにより得られる６２９ＫＨ
２の低域変換色信号ｒｓｔが発生する。As a result, the terminal (13) receives 629KH obtained by low-pass converting the 3.58M)12 carrier color signal f.
A low frequency converted color signal rst of 2 is generated.
尚、第１図５７） Ｌ Ｐ Ｆ（１２）及び（２ｏ）は
、いずれも（ｆ’ｓ＋ｆｓｔ）±ｒ、の信号からｒｓＬ
の信号を抽出するものであるが、（ｆ’ｓ＋ ｆｓｔ、
） ＋ ｆｓの信号の周波数は７ 、７８９ＭＨ，又（
ｆ’ｓ＋ｆ’ｓｔ） ｆ’ｓの信号の周波数は６２９
ＫＨｚと十分熱れているので、前記ＬＰＦは簡単な構
成でＩＣ内に内蔵することが可能である。57) L P F (12) and (2o) are both rsL from the signal of (f's+fst)±r.
(f's + fst,
) + fs signal frequency is 7,789MH, or (
f's+f'st) The frequency of the f's signal is 629
Since it is sufficiently hot at KHz, the LPF can be built into an IC with a simple configuration.
（ト）発明の効果
以上述べた如く本発明に依れば、搬送色信号及び低域変
換色信号の和の周波数の信号を、周波数変換の為に直接
用いることが出来るので、高価なりＰＦが不要となる。(G) Effects of the Invention As described above, according to the present invention, a signal with a frequency that is the sum of a carrier color signal and a low-frequency conversion color signal can be directly used for frequency conversion, so it is not expensive or requires a PF. No longer needed.
このため、ＩＣ化に際して外付部品数及びピン数の削減
が計れるという利点を有する。又、本発明に依れば、Ｖ
ＣＯの発振出力信号を水平同期信号と同期きせる為に、
第２周波数変換回路の一方の入力として発振回路の発振
出力信号を用いているので、簡単な回路構成で同期がと
れる。Therefore, it has the advantage that the number of external parts and pins can be reduced when integrated into an IC. Also, according to the present invention, V
In order to synchronize the CO oscillation output signal with the horizontal synchronization signal,
Since the oscillation output signal of the oscillation circuit is used as one input of the second frequency conversion circuit, synchronization can be achieved with a simple circuit configuration.
第１図は、本発明の一実施例を示す回路図、及び第２図
は従来の低域変換回路を示す回路図である。
（２）・・・ＢＰＦ、 （３）・・・第１周波数変換
回路、（１２）・Ｌ Ｐ Ｆ 、 （１４）・Ｖ
Ｘ Ｏｌ （１７）−Ｖ ＣＯｌ （１８）・・・第
２周波数変換回路。FIG. 1 is a circuit diagram showing an embodiment of the present invention, and FIG. 2 is a circuit diagram showing a conventional low frequency conversion circuit. (2)...BPF, (3)...First frequency conversion circuit, (12)・LPF, (14)・V
XOl (17)-VCOI (18)...Second frequency conversion circuit.
Claims (1)
する第１周波数変換回路を備えるビデオテープレコーダ
において、前記搬送色信号と前記低域変換色信号との和
の周波数に応じた信号を前記第１周波数変換回路に印加
するＶＣＯと、所定周波数で発振する発振回路と、前記
ＶＣＯ及び前記発振回路の発振出力信号が印加される第
２周波数変換回路と、ＬＰＦを介して印加される前記第
２周波数変換回路の出力信号と前記映像信号中の水平同
期信号との位相比較を行ない、その出力信号で前記ＶＣ
Ｏの発振出力信号を制御する位相比較回路とを備えてお
り、前記ＶＣＯの発振出力信号を用いて前記第１周波数
変換回路で、周波数変換を行なうことを特徴とするビデ
オテープレコーダ。(1) In a video tape recorder equipped with a first frequency conversion circuit that converts a carrier color signal in a video signal into a low frequency conversion color signal, A VCO that applies signals to the first frequency conversion circuit, an oscillation circuit that oscillates at a predetermined frequency, a second frequency conversion circuit to which oscillation output signals of the VCO and the oscillation circuit are applied, and a signal that is applied via an LPF. A phase comparison is performed between the output signal of the second frequency conversion circuit and the horizontal synchronization signal in the video signal, and the output signal is used to convert the VC
and a phase comparison circuit for controlling an oscillation output signal of the VCO, and the first frequency conversion circuit performs frequency conversion using the oscillation output signal of the VCO.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61168449A JPS6324785A (en) | 1986-07-17 | 1986-07-17 | Video tape recorder |
| DE8787109875T DE3782871T2 (en) | 1986-07-17 | 1987-07-08 | FREQUENCY CONVERTER FOR A VIDEO TAPE RECORDING DEVICE. |
| EP87109875A EP0253296B1 (en) | 1986-07-17 | 1987-07-08 | Frequency converter for video tape recorder |
| US07/072,202 US4807048A (en) | 1986-07-17 | 1987-07-08 | Frequency converter for video tape recorder |
| KR1019870007707A KR930002858B1 (en) | 1986-07-17 | 1987-07-16 | Frequency converter for video tape recoder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61168449A JPS6324785A (en) | 1986-07-17 | 1986-07-17 | Video tape recorder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6324785A true JPS6324785A (en) | 1988-02-02 |
Family
ID=15868316
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61168449A Pending JPS6324785A (en) | 1986-07-17 | 1986-07-17 | Video tape recorder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6324785A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02188088A (en) * | 1989-01-17 | 1990-07-24 | Hitachi Ltd | Carrier signal generating circuit |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5684095A (en) * | 1979-12-13 | 1981-07-09 | Matsushita Electric Ind Co Ltd | Magnetic video recorder |
| JPS56160192A (en) * | 1980-04-09 | 1981-12-09 | Matsushita Electric Ind Co Ltd | Processing circuit of chrominance signal |
-
1986
- 1986-07-17 JP JP61168449A patent/JPS6324785A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5684095A (en) * | 1979-12-13 | 1981-07-09 | Matsushita Electric Ind Co Ltd | Magnetic video recorder |
| JPS56160192A (en) * | 1980-04-09 | 1981-12-09 | Matsushita Electric Ind Co Ltd | Processing circuit of chrominance signal |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02188088A (en) * | 1989-01-17 | 1990-07-24 | Hitachi Ltd | Carrier signal generating circuit |
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