JPS6374217A - Circuit for generating carrier and subcarrier - Google Patents
Circuit for generating carrier and subcarrierInfo
- Publication number
- JPS6374217A JPS6374217A JP22046886A JP22046886A JPS6374217A JP S6374217 A JPS6374217 A JP S6374217A JP 22046886 A JP22046886 A JP 22046886A JP 22046886 A JP22046886 A JP 22046886A JP S6374217 A JPS6374217 A JP S6374217A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- signal
- subcarrier
- output
- signal generator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000006866 deterioration Effects 0.000 abstract description 3
- 230000006641 stabilisation Effects 0.000 abstract description 2
- 238000011105 stabilization Methods 0.000 abstract description 2
- 239000012050 conventional carrier Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Landscapes
- Transmitters (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は搬送波・副搬送波発生回路に関し、特に搬送波
及び副搬送波を用いて放送するラジオ放送装置等に使用
する搬送波・副搬送波発生回路に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a carrier wave/subcarrier wave generation circuit, and more particularly to a carrier wave/subcarrier wave generation circuit used in a radio broadcasting device or the like that broadcasts using a carrier wave and a subcarrier wave.
従来、この種の搬送波・副搬送波発生回路は、搬送波用
の信号発生器と副搬送波用の信号発生器とを別々に設け
、それぞれ所定の周波数の搬送波信号及び副搬送波信号
を得る構成となっていた。Conventionally, this type of carrier wave/subcarrier generation circuit has a configuration in which a carrier wave signal generator and a subcarrier wave signal generator are provided separately to obtain a carrier wave signal and a subcarrier signal of a predetermined frequency, respectively. Ta.
上述した従来の搬送波・副搬送波発生回路は、搬送波用
の信号発生器と副搬送波用の信号発生器とを別々に有す
る構成となっているので、それぞれの信号発生器に対し
て周波数の安定化を行なわなければならないという欠点
がある。The conventional carrier/subcarrier generation circuit described above has a separate signal generator for the carrier wave and a signal generator for the subcarrier wave, so it is necessary to stabilize the frequency for each signal generator. The disadvantage is that you have to do
また、搬送波と副搬送波の干渉があるため、搬送波の周
波数と副搬送波の周波数の値によっては、また、二つの
信号発生器の温度変化や経過時間等に対する特性の差に
よって、これら２つの波の干渉波の周波数が音声帯域内
に入り、ラジオ放送装置等のＳＮ比を著しく劣化させる
場合があるという欠点があった。In addition, since there is interference between the carrier wave and subcarrier wave, depending on the values of the frequency of the carrier wave and the frequency of the subcarrier wave, and due to differences in the characteristics of the two signal generators with respect to temperature changes, elapsed time, etc. There is a drawback that the frequency of the interference wave falls within the audio band, which may significantly deteriorate the S/N ratio of radio broadcasting equipment, etc.
この対策の一つとしてＰ Ｌ Ｌ回路を用いて副搬送波
の周波数を搬送波でロックさせる方法があるが、回路が
複雑になる上にロックさせるための引込み時間を必要と
するなどの欠点がある。One solution to this problem is to use a PLL circuit to lock the frequency of the subcarrier to the carrier, but this method has drawbacks such as the circuit becoming complicated and the locking time required.
本発明の目的は、簡単な回路で搬送波と副搬送波との干
渉波によるＳＮ比の劣化を防止することのできる搬送波
・副搬送波発生回路を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a carrier wave/subcarrier generation circuit that can prevent deterioration of the SN ratio due to interference waves between a carrier wave and a subcarrier wave with a simple circuit.
本発明の搬送波・副搬送波発生回路は、一つの信号発生
器と、この信号発生器の出力信号を分周して第１の周波
数の搬送波信号を出力する第１の分周器と、この第１０
分周器の出力信号又は前記信号発生器の出力信号を分周
して第２の周波数の副搬送波信号を出力する第２の分周
器とを有している。The carrier/subcarrier generation circuit of the present invention includes one signal generator, a first frequency divider that divides the output signal of this signal generator and outputs a carrier signal of a first frequency, and 10
and a second frequency divider that divides the output signal of the frequency divider or the output signal of the signal generator to output a subcarrier signal of a second frequency.
次に、本発明の実施例について図面を参照して説明する
。Next, embodiments of the present invention will be described with reference to the drawings.
第１図（ａ）、（ｂ）はそれぞれ本発明の第１及び第２
の実施例を示すブロック図である。FIGS. 1(a) and (b) are the first and second embodiments of the present invention, respectively.
It is a block diagram showing an example of.
第１図（ａ）において、信号発生器１は所定の周波数を
もつ矩形波の信号を出力する。In FIG. 1(a), a signal generator 1 outputs a rectangular wave signal having a predetermined frequency.
第１の分周器２は、信号発生器１の出力信号を分周し第
１の周波数の搬送波信号を出力する。The first frequency divider 2 divides the output signal of the signal generator 1 and outputs a carrier wave signal of a first frequency.
第２の分周器３は、信号発生器１の出力信号を分周し第
２の周波数の副搬送波信号を出力する。The second frequency divider 3 divides the output signal of the signal generator 1 and outputs a subcarrier signal of a second frequency.
第１図（ｂ）は、第２の分周器３．の入力信号を第１の
分周器２の出力信号から得て第２の周波数の副搬送波信
号を得る場合の例を示す。FIG. 1(b) shows the second frequency divider 3. An example will be shown in which a subcarrier signal of the second frequency is obtained by obtaining the input signal of the first frequency divider 2 from the output signal of the first frequency divider 2.
これら実施例によって得られた搬送波及び副搬送波信号
は、一つの信号発生器１の出力信号をそれぞれの分周の
値によって分周した信号であるので、一度、これら信号
の干渉波が音声帯域内に入らないように分周比を設定す
れば、温度変化や経過時間等によってこの分周比は変化
することがないため干渉波によりＳＮ比が劣化すること
はない。Since the carrier wave and subcarrier signals obtained by these embodiments are signals obtained by dividing the output signal of one signal generator 1 by the respective frequency division values, once the interference waves of these signals are within the audio band, If the frequency division ratio is set so as not to fall into the range, the frequency division ratio will not change due to temperature changes, elapsed time, etc., and therefore the SN ratio will not deteriorate due to interference waves.
以上説明したように本発明は、同一の信号発生器の出力
信号をそれぞれ分周して搬送波信号と副搬送波信号とを
発生する構成とすることにより、周波数の安定化を含む
回路を簡単にすることができ、一度、搬送波と副搬送波
とによる干渉波の周波数が音声帯域内に入らないように
分周比を設定すれば、温度変化や経過時間等によりこの
分周比は変化しないので、干渉波によるＳＮ比の劣化を
防止することができる効果がある。As explained above, the present invention simplifies the circuit including frequency stabilization by dividing the output signals of the same signal generator to generate a carrier signal and a subcarrier signal. Once the frequency division ratio is set so that the frequency of the interference wave caused by the carrier wave and subcarrier wave does not fall within the audio band, this frequency division ratio will not change due to changes in temperature or elapsed time, so interference can be prevented. This has the effect of preventing deterioration of the SN ratio due to waves.
第１図（ａ）、（ｂ）はそれぞれ本発明の第１及び第２
の実施例を示すブロック図である、１・・・信号発生器
、２．３．３．・・・分周器。FIGS. 1(a) and (b) are the first and second embodiments of the present invention, respectively.
1... Signal generator, 2.3.3. ...Divider.
Claims (1)
して第１の周波数の搬送波信号を出力する第１の分周器
と、この第１の分周器の出力信号又は前記信号発生器の
出力信号を分周して第２の周波数の副搬送波信号を出力
する第２の分周器とを有することを特徴とする搬送波・
副搬送波発生回路。one signal generator, a first frequency divider that divides the output signal of this signal generator and outputs a carrier wave signal of a first frequency, and an output signal of this first frequency divider or the signal a second frequency divider that divides the output signal of the generator and outputs a subcarrier signal of a second frequency;
Subcarrier generation circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22046886A JPS6374217A (en) | 1986-09-17 | 1986-09-17 | Circuit for generating carrier and subcarrier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22046886A JPS6374217A (en) | 1986-09-17 | 1986-09-17 | Circuit for generating carrier and subcarrier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6374217A true JPS6374217A (en) | 1988-04-04 |
Family
ID=16751586
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22046886A Pending JPS6374217A (en) | 1986-09-17 | 1986-09-17 | Circuit for generating carrier and subcarrier |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6374217A (en) |
-
1986
- 1986-09-17 JP JP22046886A patent/JPS6374217A/en active Pending
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