JPS6133423B2 - - Google Patents
Info
- Publication number
- JPS6133423B2 JPS6133423B2 JP54106275A JP10627579A JPS6133423B2 JP S6133423 B2 JPS6133423 B2 JP S6133423B2 JP 54106275 A JP54106275 A JP 54106275A JP 10627579 A JP10627579 A JP 10627579A JP S6133423 B2 JPS6133423 B2 JP S6133423B2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- frequency
- difference
- reset
- pilot
- 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.)
- Expired
Links
- 238000001514 detection method Methods 0.000 claims description 11
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 5
- 239000002131 composite material Substances 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 4
- 238000007493 shaping process Methods 0.000 description 3
- 235000014676 Phragmites communis Nutrition 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/60—Receiver circuitry for the reception of television signals according to analogue transmission standards for the sound signals
- H04N5/607—Receiver circuitry for the reception of television signals according to analogue transmission standards for the sound signals for more than one sound signal, e.g. stereo, multilanguages
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Television Receiver Circuits (AREA)
- Stereo-Broadcasting Methods (AREA)
Description
【発明の詳細な説明】
本発明はテレビ音声多重放送におけるプログラ
ム内容を示すパイロツト信号の識別装置に関する
ものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for identifying pilot signals indicating program contents in television audio multiplex broadcasting.
テレビ音声多重放送の信号成分にはメインチヤ
ンネル（Ｌ＋Ｒ）と、サブチヤンネル（Ｌ−Ｒ）
と更にはプログラム内容を示す制御チヤンネル信
号であるパイロツト信号とがあり、このパイロツ
ト信号はテレビの水平同期信号の約3.5倍の周波
数すなわち55.07KHzの搬送波が用いられ、これ
がステレオ放送時には982.5Hzのシングルトーン
により、また２ケ国語放送時には922.5Hzのシン
グルトーンによりそれぞれAM変調されたもので
ある。 The signal components of TV audio multiplex broadcasting include a main channel (L+R) and a subchannel (L-R).
In addition, there is a pilot signal, which is a control channel signal that indicates the program content.This pilot signal uses a carrier wave of approximately 3.5 times the frequency of the TV's horizontal synchronization signal, that is, 55.07KHz, and during stereo broadcasting, it is converted into a single carrier wave of 982.5Hz. It is AM modulated by tone, or by a single tone of 922.5Hz when broadcasting in two languages.
従つて、受信側ではこのパイロツト信号の変調
成分である982.5Hz又は922.5Hzのシングルトーン
周波数を検出識別して多重復調回路の復調動作
を、ステレオ、２ケ国語若しくはモノラルの各放
送プログラム内容に応じて行わせるよう構成され
ている。 Therefore, on the receiving side, the single tone frequency of 982.5Hz or 922.5Hz, which is the modulation component of this pilot signal, is detected and identified, and the demodulation operation of the multiplex demodulation circuit is controlled according to the contents of the stereo, bilingual, or monaural broadcast program. It is configured to do this.
かゝるプログラム内容を示すパイロツト信号を
検出して各プログラム内容に応じた識別制御信号
を発生するパイロツト信号識別回路においては、
982.5Hz，922.5Hzの各周波数を検出するためにそ
れぞれリードフイルタが用いられている。しかし
ながら、当該リードフイルタはコストが高くかつ
機械的なシヨツクに弱く信頼性に欠けるという欠
点がある。 In a pilot signal identification circuit that detects a pilot signal indicating such program content and generates an identification control signal according to each program content,
Reed filters are used to detect each frequency of 982.5Hz and 922.5Hz. However, such reed filters have the drawbacks of being high in cost, weak against mechanical shock, and lacking in reliability.
本発明の目的はリードフイルタを用いることな
く高信頼性でかつコスト的にも安価な音声多重放
送パイロツト信号識別装置を提供することであ
る。 An object of the present invention is to provide a highly reliable and inexpensive audio multiplex broadcast pilot signal identification device without using a read filter.
本発明のパイロツト信号識別装置は、制御チヤ
ンネル信号であるパイロツト信号からプログラム
内容を示すシングルトーン信号である表示信号を
検波する検波手段と、所定周波数を有する基準信
号を出力する基準信号発生手段と、検波手段の検
波出力であるシングルトーン周波数と基準信号発
生手段の出力信号周波数との差を検出してこの差
に応じた差信号を発生する手段と、パイロツト信
号の存在時のみにパイロツト検出信号を発生する
手段と、このパイロツト検出信号の存在時に前記
差信号に基づいてプログラマ内容を示すシングル
トーン信号である表示信号の識別をなす識別手段
とを含んでいることを特徴としている。 The pilot signal identification device of the present invention includes a detection means for detecting a display signal, which is a single tone signal indicating program content, from a pilot signal, which is a control channel signal, and a reference signal generation means, which outputs a reference signal having a predetermined frequency. means for detecting the difference between the single tone frequency which is the detection output of the detection means and the output signal frequency of the reference signal generation means and generating a difference signal corresponding to this difference; and means for generating a pilot detection signal only when a pilot signal is present. and a discriminating means for discriminating a display signal, which is a single tone signal indicating program content, based on the difference signal when the pilot detection signal is present.
上記基準信号発生手段の好ましい実施態様とし
ては、パイロツト信号をうけてこの信号の周波数
を所定数分の１に分周する分周手段を有すること
を特徴とし、また、差に応じた検出信号を発生す
る手段としては差の周波数を計数する計数手段を
用いることができる。 A preferred embodiment of the reference signal generating means is characterized by having frequency dividing means for receiving a pilot signal and dividing the frequency of this signal by a predetermined number, and generating a detection signal according to the difference. As the generating means, a counting means for counting the difference frequency can be used.
以下、本発明について図面を用いて説明する。 Hereinafter, the present invention will be explained using the drawings.
第１図は本発明の一実施例を示すブロツク図で
あり、検波器（図示しない）からのFM検波され
たコンポジツト信号は帯域フイルタ１により、
55.07KHzの搬送波を有するパイロツト信号Aが
選択抽出される。この信号AはAM検波器２に
おいて982.5Hz若しくは922.5Hzのシングルトーン
周波数信号に検波され、帯域フイルタ３を介して
シユミツト回路等の波形整形回路４に入力され
る。こゝでは、サイン波信号がそれと同一の周波
数を有する矩形状パルス信号Tに変換されるこ
とになる。 FIG. 1 is a block diagram showing an embodiment of the present invention, in which an FM-detected composite signal from a detector (not shown) is filtered by a bandpass filter 1.
A pilot signal A having a carrier wave of 55.07 KHz is selected and extracted. This signal A is detected by the AM detector 2 into a single tone frequency signal of 982.5 Hz or 922.5 Hz, and is inputted via the bandpass filter 3 to a waveform shaping circuit 4 such as a Schmitt circuit. Here, the sine wave signal is converted into a rectangular pulse signal T having the same frequency as the sine wave signal.
一方、パイロツト信号Aは波形整形回路５に
より同じく同一周波数の矩形状パルス信号に変換
されて、例えば図示する如く1/64分周器６へ印加
されて、基準信号Qとなり、先のパルス信号T
との周波数差を検出すべく例えばＤ―FF（デイ
レイド・フリツプ・フロツプ）７のデータ入力と
なる。従つてパルス信号TはＤ―FF７のクロツ
ク入力となり、このＤ―FF７の出力には両パル
ス信号QとTの差の周波数を有する信号Dが
発生されることになる。 On the other hand, the pilot signal A is converted into a rectangular pulse signal of the same frequency by the waveform shaping circuit 5, and is applied to the 1/64 frequency divider 6 as shown in the figure, for example, to become the reference signal Q , which is converted into the previous pulse signal T.
For example, it becomes a data input to a D-FF (delayed flip-flop) 7 to detect the frequency difference between the two. Therefore, the pulse signal T becomes the clock input of the D-FF7, and a signal D having a frequency that is the difference between the two pulse signals Q and T is generated at the output of the D-FF7.
この信号Dの周波数を検出するための手段と
しては、例えば図に示す如く２ケのフリツプ・フ
ロツプ８及び９が縦続接続されたいわゆる２ビツ
ト構成の計数器が用いられる。この計数器はリセ
ツト信号発生回路１０よりのリセツト信号Rに
より周期的にリセツトされ、２ビツト目のフリツ
プ・フロツプ９の出力内容すなわち計数器の２ビ
ツト目のリセツト直前の内容が差周波数（D）
の検出のために用いられる。 As a means for detecting the frequency of the signal D , for example, a so-called 2-bit counter having two flip-flops 8 and 9 connected in cascade as shown in the figure is used. This counter is reset periodically by the reset signal R from the reset signal generating circuit 10, and the output content of the flip-flop 9 at the 2nd bit, that is, the content immediately before the reset of the 2nd bit of the counter, becomes the difference frequency ( D ).
used for the detection of
そのために、波形整形回路５のパルス信号が更
に信号検出器１１に入力されて、パイロツト信号
の存在が検出され、この検出器１１の出力とフリ
ツプフロツプ９の出力との論理積がアンドゲート
１２によりなされて、その出力が２ケ国語制御信
号となる。また、フリツプフロツプ９の出力のイ
ンバータ１３による反転信号と、検出器１１の出
力との論理積がアンドゲート１４によりなされ
て、その出力がステレオ制御信号となる。 For this purpose, the pulse signal of the waveform shaping circuit 5 is further input to the signal detector 11, the presence of the pilot signal is detected, and the output of this detector 11 and the output of the flip-flop 9 are ANDed by the AND gate 12. The output becomes a bilingual control signal. Further, the inverted signal of the output of the flip-flop 9 by the inverter 13 and the output of the detector 11 are ANDed by an AND gate 14, and the output thereof becomes a stereo control signal.
かゝる構成において、パルス信号Qの周波数
は55.07／64KHzすなわち860.47Hzであり、よつて
Ｄ−FF７の出力周波数Dは、２ケ国語放送時は
922.5−860.47＝62.03Hz、ステレオ放送時は982.5
−860.47＝122.03Hzとなる。こゝでリセツト信号
発生回路１０のリセツト信号Rの周波数を例え
ば25Hzに選定すれば、２ケ国語放送時は62.03／
25＝2.48，ステレオ放送時は122.03／25＝4.88な
る数値が得られるから、２ビツト計数器の２ビツ
ト目の計数内容Q1は２ケ国語放送時には高レベ
ルとなり、ステレオ放送時には低レベルとなるこ
とが分る。 In such a configuration, the frequency of the pulse signal Q is 55.07/64KHz, or 860.47Hz, so the output frequency D of D-FF7 is
922.5−860.47=62.03Hz, 982.5 when broadcasting in stereo
−860.47=122.03Hz. If the frequency of the reset signal R of the reset signal generation circuit 10 is selected to be, for example, 25Hz, the frequency will be 62.03/2 when broadcasting in two languages.
25 = 2.48, and 122.03/25 = 4.88 during stereo broadcasting, so the second bit of the 2-bit counter, Q1 , will be at a high level when broadcasting in two languages, and at a low level during stereo broadcasting. I understand.
第２図は差信号周波数Dと計数器の各ビツト
の計数内容Q1，Q2との関係を示す図であり、Ａ
はステレオ放送時、Ｂは２ケ国語放送時の場合で
あり、リセツト間隔Ｔが1/25secの場合のある任
意の部分を抽出して示している。 Figure 2 is a diagram showing the relationship between the difference signal frequency D and the count contents Q 1 and Q 2 of each bit of the counter.
1 is for stereo broadcasting, B is for bilingual broadcasting, and arbitrary portions where the reset interval T is 1/25 sec are extracted and shown.
従つて、ステレオ時にはアンドゲート１４の出
力は高レベルとなり他方のゲート１２の出力は低
レベルとなる。また２ケ国語のときはゲート１２
が高レベルとなり、よつてこれらゲート出力をス
テレオ、２ケ国語放送の制御信号として用いるこ
とが可能となり、両ゲート出力が共に低レベルの
ときはモノラル放送の制御信号を発生させるよう
にすることは容易である。 Therefore, during stereo, the output of the AND gate 14 is at a high level, and the output of the other gate 12 is at a low level. Also, if there are two languages, gate 12
becomes a high level, and therefore these gate outputs can be used as control signals for stereo and bilingual broadcasting, and when both gate outputs are at a low level, it is possible to generate control signals for monaural broadcasting. It's easy.
尚、パイロツト信号検出器１１とアンドゲート
１２と１４とを設けた理由は、テレビ特有の問題
である音声回路に悪影響を与えるバズ音等のノイ
ズ成分により、識別回路全体が誤動作するのを防
止するためであり、パイロツト信号の存在時のみ
ステレオ及び２ケ国語の制御信号（識別信号でも
ある）を発生させ信頼性の向上を図つている。 The reason why the pilot signal detector 11 and the AND gates 12 and 14 are provided is to prevent the entire identification circuit from malfunctioning due to noise components such as buzz sounds that adversely affect the audio circuit, which is a problem unique to televisions. In order to improve reliability, a stereo and bilingual control signal (also an identification signal) is generated only when a pilot signal is present.
上記において、リセツト信号Rの周波数を25
Hzとしたが30Hzとした場合には、２ケ国語時は
62.03／30＝2.07、ステレオ放送時は122.03／30＝
4.07なる数値が得られるから、２ビツト目のフリ
ツプフロツプ９の出力はリセツト周波数25Hzの場
合と同様に前者の場合に高レベル、後者の場合に
低レベルとなる。従つて、リセツト信号発生回路
１０として1/2分周器を設け、その入力として商
用電源を用いれば、50Hz及び60Hzの両地域におい
て何等の調整を必要とすることなく信号の識別が
可能となる。 In the above, the frequency of the reset signal R is set to 25
Hz, but if you set it to 30Hz, when there are two languages,
62.03/30=2.07, 122.03/30= during stereo broadcasting
Since a value of 4.07 is obtained, the output of the second bit flip-flop 9 will be at a high level in the former case and a low level in the latter case, as in the case of the reset frequency of 25 Hz. Therefore, by providing a 1/2 frequency divider as the reset signal generation circuit 10 and using a commercial power source as its input, it becomes possible to identify signals in both 50Hz and 60Hz regions without requiring any adjustment. .
また、テレビの複合信号中の垂直同期信号を用
いて1/2分周することにより同様に30Hzのリセツ
ト信号が得られるものである。もつとも、内蔵の
発振器を用いてもよいことは勿論である。 Similarly, a 30Hz reset signal can be obtained by dividing the frequency by 1/2 using the vertical synchronization signal in the TV composite signal. Of course, a built-in oscillator may also be used.
更に、リセツト周波数R、分周器６の分周
数、及び計数器のビツト数、更には読み出すべき
ビツトの決定はこれらを適当に選定して定めるこ
とが可能であり、上記実施例の各数値については
最も好ましい例を掲げたものであつて、これらに
限定されるものではないことは明白である。 Furthermore, the reset frequency R , the frequency division number of the frequency divider 6, the number of bits of the counter, and further the determination of the bits to be read can be determined by appropriately selecting these, and each numerical value in the above embodiment can be determined. It is clear that the most preferred examples are listed and the invention is not limited to these.
また、基準となるべき周波数信号Qをパイロ
ツト信号により得ているが、別に内蔵発振器を用
いて行わせることも可能となる。 Further, although the frequency signal Q that is to be the reference is obtained by a pilot signal, it is also possible to use a separate built-in oscillator.
以上述べた如く、本発明によればリードフイル
タを用いることがなく、かつ集積回路化が容易で
あるので、低コスト及び高信頼性の装置が得られ
る。 As described above, according to the present invention, a lead filter is not used and it is easy to integrate the device into an integrated circuit, so that a low-cost and highly reliable device can be obtained.
第１図は本発明の一実施例を示すブロツク図、
第２図Ａ，Ｂは第１図の回路ブロツクの動作を示
す波形図である。
主要部分の符号の説明、２……AM検波器、６
……分周器、７……Ｄ−FF、８，９……フリツ
プフロツプ、１０……リセツト信号発生器、１１
……パイロツト信号検出器。
FIG. 1 is a block diagram showing one embodiment of the present invention;
2A and 2B are waveform diagrams showing the operation of the circuit block of FIG. 1. Explanation of symbols of main parts, 2...AM detector, 6
...Frequency divider, 7...D-FF, 8,9...Flip-flop, 10...Reset signal generator, 11
...Pilot signal detector.
Claims (1)
ツト信号を検出して各プログラム内容に応じた識
別信号を発生するパイロツト信号識別装置であつ
て、前記パイロツト信号から前記プログラム内容
の表示信号を検波する検波手段と、所定周波数の
基準信号を出力する基準信号発生手段と、前記検
波手段の出力信号周波数と前記基準信号周波数と
の差を検出してこの差に応じた差信号を発生する
差信号発生手段と、前記パイロツト信号の有無を
検出してパイロツト信号の存在時のみ検出信号を
発生する手段と、前記検出信号の発生時に前記差
信号に基づき前記プログラム内容の表示信号の識
別をなす識別手段とを含む音声多重放送パイロツ
ト信号識別装置。 ２ 前記基準信号発生手段は前記パイロツト信号
の周波数を所定数分の１に分周する分周手段を有
し、この分周出力を前記基準信号とすることを特
徴とする特許請求の範囲第１項記載の音声多重放
送パイロツト信号識別装置。 ３ 前記差信号発生手段は前記出力信号周波数と
前記基準信号周波数との差周波数を有する信号を
発生する手段と、この差周波数信号の周波数を計
数する計数手段と、前記計数手段を所定期間毎に
リセツトするリセツト手段とを含み、前記計数手
段のリセツト直前の計数内容に基づき前記プログ
ラム内容の表示信号を識別することを特徴とする
特許請求の範囲第１項又は第２項記載の識別装
置。 ４ 前記リセツト手段は商用電源を入力としこの
電源周波数を用いてリセツト信号を発生するよう
構成されていることを特徴とする特許請求の範囲
第３項記載の識別装置。 ５ 前記リセツト手段は複合映像信号中の垂直同
期信号を用いてリセツト信号を発生するよう構成
されていることを特徴とする特許請求の範囲第３
項記載の識別装置。[Scope of Claims] 1. A pilot signal identification device that detects a pilot signal indicating the program content of an audio multiplex broadcast and generates an identification signal according to each program content, which detects a display signal of the program content from the pilot signal. a detection means for detecting a reference signal of a predetermined frequency, a reference signal generation means for outputting a reference signal of a predetermined frequency, and a difference between the output signal frequency of the detection means and the reference signal frequency and for generating a difference signal according to this difference. difference signal generating means, means for detecting the presence or absence of the pilot signal and generating a detection signal only when the pilot signal is present, and identifying the display signal of the program content based on the difference signal when the detection signal is generated. An audio multiplex broadcast pilot signal identification device comprising: identification means. 2. The reference signal generating means has frequency dividing means for dividing the frequency of the pilot signal by a predetermined number, and the divided output is used as the reference signal. The audio multiplex broadcasting pilot signal identification device as described in 2. 3. The difference signal generating means includes means for generating a signal having a difference frequency between the output signal frequency and the reference signal frequency, a counting means for counting the frequency of the difference frequency signal, and a counting means for every predetermined period. 3. The identification device according to claim 1, further comprising a reset means for resetting the program, and for identifying the display signal of the program content based on the count content of the counting means immediately before the reset. 4. The identification device according to claim 3, wherein the reset means is configured to receive a commercial power source and generate a reset signal using the frequency of the power source. 5. Claim 3, wherein the reset means is configured to generate a reset signal using a vertical synchronization signal in a composite video signal.
Identification device as described in section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10627579A JPS55110482A (en) | 1979-08-21 | 1979-08-21 | Pilot signal identifying unit of audio multiplex broadcast |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10627579A JPS55110482A (en) | 1979-08-21 | 1979-08-21 | Pilot signal identifying unit of audio multiplex broadcast |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP54018014A Division JPS6056352B2 (en) | 1979-02-19 | 1979-02-19 | Audio multiplex broadcast pilot signal identification device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55110482A JPS55110482A (en) | 1980-08-25 |
| JPS6133423B2 true JPS6133423B2 (en) | 1986-08-01 |
Family
ID=14429520
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10627579A Granted JPS55110482A (en) | 1979-08-21 | 1979-08-21 | Pilot signal identifying unit of audio multiplex broadcast |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS55110482A (en) |
-
1979
- 1979-08-21 JP JP10627579A patent/JPS55110482A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS55110482A (en) | 1980-08-25 |
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