JPS5892161A - Method for multiplex broadcasting fm data - Google Patents
Method for multiplex broadcasting fm dataInfo
- Publication number
- JPS5892161A JPS5892161A JP19143281A JP19143281A JPS5892161A JP S5892161 A JPS5892161 A JP S5892161A JP 19143281 A JP19143281 A JP 19143281A JP 19143281 A JP19143281 A JP 19143281A JP S5892161 A JPS5892161 A JP S5892161A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- data
- stereo
- output
- modulator
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/86—Arrangements characterised by the broadcast information itself
- H04H20/88—Stereophonic broadcast systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/44—Arrangements characterised by circuits or components specially adapted for broadcast
- H04H20/46—Arrangements characterised by circuits or components specially adapted for broadcast specially adapted for broadcast systems covered by groups H04H20/53-H04H20/95
- H04H20/47—Arrangements characterised by circuits or components specially adapted for broadcast specially adapted for broadcast systems covered by groups H04H20/53-H04H20/95 specially adapted for stereophonic broadcast systems
- H04H20/48—Arrangements characterised by circuits or components specially adapted for broadcast specially adapted for broadcast systems covered by groups H04H20/53-H04H20/95 specially adapted for stereophonic broadcast systems for FM stereophonic broadcast systems
Abstract
Description
【発明の詳細な説明】
本発明は、ＦＭ信号にデータを多重化して放送するＦＭ
データ多重放送方法に関するもので、受信機での再生音
質の向上を目的とする。DETAILED DESCRIPTION OF THE INVENTION The present invention provides an FM
This relates to a data multiplex broadcasting method and aims to improve the quality of reproduced sound on a receiver.
一般に、ＦＭ放送は再生信号の周波数特性、Ｓ／Ｎ比、
歪率などにおいて優れ、高品質の音楽放送方法として適
しているが、必ずしも原音に忠実であるとは言えない。In general, FM broadcasting requires the frequency characteristics of the reproduced signal, the S/N ratio,
Although it has excellent distortion rates and is suitable as a high-quality music broadcasting method, it cannot necessarily be said to be faithful to the original sound.
忠実度に悪影響を与える最大の要因は放送局で使用され
るリミッティングアンプにある。周知のように再生信号
の聴感上のＳ／Ｎ比を向上させるためには送信時の変調
度が高いほど良いが、一方、放送波の占有帯域幅の規定
からＦＭ放送では１００％調７５ＫＨ・偏移以内に制限
されている。どのため放送局においては平均変調度を上
げるため、変調前に音声信号に対してリミッティングア
ンプによるダイナミックレンジの圧縮を行っている。第
１図はこのリミッティングアンプの入出力特性の一例で
ある。これによって第１図の場合では、入力信号におけ
る一２０ｄＢからｏｄＢまでの２０ ｄＢのレベル比は
出力信号においてｓｄＢ のレベル比に圧縮される。こ
のリミッティングアンプによる圧縮は波形の瞬時圧縮で
はなく、入力信号の平均値に応じたシラブル圧縮なので
、周波数特性や歪率の劣化は無い。The biggest factor that negatively affects fidelity is the limiting amplifier used at broadcast stations. As is well known, in order to improve the audible S/N ratio of the reproduced signal, the higher the degree of modulation during transmission, the better; however, due to the regulations regarding the occupied bandwidth of broadcast waves, in FM broadcasting, 100% tone 75KH. limited within the deviation. For this reason, in order to increase the average modulation degree, broadcasting stations use limiting amplifiers to compress the dynamic range of audio signals before modulation. FIG. 1 shows an example of the input/output characteristics of this limiting amplifier. As a result, in the case of FIG. 1, a level ratio of 20 dB from -20 dB to odB in the input signal is compressed to a level ratio of sdB in the output signal. The compression by this limiting amplifier is not instantaneous waveform compression, but syllable compression according to the average value of the input signal, so there is no deterioration in frequency characteristics or distortion rate.
しかし本来の音楽ソースが持っていた大きなダイナミッ
クレンジを犠牲にした迫力に乏しい再生音となってしま
う。However, this results in a playback sound that lacks impact, sacrificing the large dynamic range that the original music source had.
ところで、ＦＭステレオ放送におけるステレオｉ合信号
の帯域は、０〜５３ Ｋ Ｈｚ であるが、これより高
い周波数に副搬送波を設定し、これを用いて２値のデー
タ信号を多重化して放送しようとするＦＭデータ多重放
送の検討が進められている。By the way, the band of the stereo i-combined signal in FM stereo broadcasting is 0 to 53 kHz, but it is possible to set a subcarrier at a higher frequency than this and use this to multiplex binary data signals for broadcast. Studies are underway on FM data multiplex broadcasting.
これによるデータ伝送速度は数Ｋ ｂｐｓであり、単に
ステレオ信号で放送されている番組の関連情報や補充情
報だけでなく、再生信号の品質向上に効果のあるデータ
の伝送も考えられる。The data transmission rate is several Kbps, and it is conceivable to transmit not only related information and supplementary information of programs broadcast in stereo signals, but also data effective in improving the quality of reproduced signals.
そこで本発明は、上記の多重化されたデータ信号として
音声信号が放送局内で前述の圧縮処理されたときの圧縮
量に対応するデータを放送し、受信機側でこのデータを
用いて音声信号を本来のダイナミックレンジに復元させ
ることを可能にするものである。Therefore, the present invention broadcasts data corresponding to the compression amount when the audio signal is subjected to the compression processing described above in the broadcasting station as the multiplexed data signal, and uses this data on the receiver side to convert the audio signal. This makes it possible to restore the original dynamic range.
第２図は本発明を用いたＦＭ放送機の構成例を示すブロ
ック図である。Ｌ、Ｒ信号はそれぞれ可変減衰器１．１
′とレベル検出器２，２′で構成されるリミッティング
アンプによって圧縮された後、ステレオ変調器４に入力
され、ステレオ複合信号を得る。一方、レベル検出器２
，２′の出力信号である圧縮制御電圧はアナログ−ディ
ジタル変換器３．３′で符号化され、次にマルチプレク
サ５で単一の符号列に合成される。この符号列によって
データ多重用副搬送波発振器６の出力を変調器７で変調
しく例えば、抑圧搬送波ＤＳＢ）、この出力と前記ステ
レオ変調器４からのステレオ複合信号とを加算器８で合
成する。最後に加算器８の出力信号によってＦＭ変調器
９で搬送波を変調し、ステレオ信号とデータ信号が多重
化されたＦＭ信号を得る。FIG. 2 is a block diagram showing an example of the configuration of an FM broadcasting device using the present invention. L and R signals are each variable attenuator 1.1
' and level detectors 2, 2', and then input to a stereo modulator 4 to obtain a stereo composite signal. On the other hand, level detector 2
, 2' are encoded by an analog-to-digital converter 3.3', and then combined into a single code string by a multiplexer 5. A modulator 7 modulates the output of the data multiplexing subcarrier oscillator 6 using this code string (for example, a suppressed carrier DSB), and an adder 8 combines this output with the stereo composite signal from the stereo modulator 4. Finally, a carrier wave is modulated by an FM modulator 9 using the output signal of the adder 8 to obtain an FM signal in which a stereo signal and a data signal are multiplexed.
第３図に加算器８の出力に得られる合成信号のスペクト
ラムを示す。点線のスペクトラムは抑圧搬送波であるこ
とを示す。ｆを中心に広がりを持った部分がデータ伝送
に用いられ、ｆの具体的な値としては１９ＫＨｚ パイ
ロット信号を利用して同期検波が可能になる５７ＫＨｚ
（＝１９ＫＨｚＸ３）、または７８ＫＨｚ（＝１９ＫＨ
ｚＸ４）が適している。FIG. 3 shows the spectrum of the composite signal obtained at the output of the adder 8. The dotted line spectrum indicates a suppressed carrier wave. The part spread around f is used for data transmission, and the specific value of f is 19 KHz. 57 KHz, which enables synchronous detection using a pilot signal.
(=19KHzX3), or 78KHz (=19KH
zX4) is suitable.
もちろん他の周波数でも適当な検波方式を用いることに
よって設定可能である。また第２図では多重化されるデ
ータは音声信号に対する圧縮量を符号化したデータのみ
であるが、他の種類のデータ、例えば放送局名２番組名
２峙刻などをマルチプレクサ６の第３の入力として重畳
させることも可能である。Of course, other frequencies can also be set by using an appropriate detection method. Furthermore, in FIG. 2, the data to be multiplexed is only data encoded with the amount of compression for the audio signal, but other types of data, such as broadcasting station name, program name, clock time, etc. It is also possible to superimpose it as an input.
第４図は本発明によるＦＭデータ多重放送に対応する受
信機の構成例を示すブロック図である。FIG. 4 is a block diagram showing an example of the configuration of a receiver compatible with FM data multiplex broadcasting according to the present invention.
フロントエンド部１０．中間周波数増幅部１１を経た受
信信号はＦＭ検波器１２で検波され、ステレオ復調器１
３でり、Ｒ信号に分離される。同時に検波信号はデータ
復調器１４によって２値デ一タ信号に再生され、’７’
−フル チプレクサ１６によりＬ信号伸張用データとＲ
信号伸張用データに分離される。それぞれのデータはデ
ィジタル−アナログ変換器１６．１６’でアナログ電圧
に変換され、可変増幅器１７．１７’を制御してり、Ｒ
信号を本来のダイナミックレンジに伸張する。この伸張
方法として、アナログ電圧による可変増幅器ではなく、
デジタル的に増幅度を可変にする場合の構成例を第５図
に示す。デマルチプレクサ１６の一方の出力であるＬ信
号伸張用データにより、アナログスイッチ回路２１は演
算増幅器２２の入力抵抗群２３の中から指定されたもの
を１個あるいは複数個の組合わせとして選択する。演算
増幅器２２による増幅回路は入力抵抗と帰還抵抗（図で
は抵抗２４）の比によって増幅度が決定されるので、上
記の構成によってアナログ電圧の介在無しにデジタル式
可変増幅器２ｏが実現できる。なおＲ信号についても同
様である。ところで第４図における１ ４ 、１５ 、
１６ 、１６’ 、 １７ 、１７’あるいは第６図の
１４．１５，２０．２０’を独立したアダプタとして構
成し、従来のＦＭ受信機と組合わせて使用することが可
能である。第６図において２６がＦＭ受信機、２６がア
ダプタである。Front end section 10. The received signal that has passed through the intermediate frequency amplification section 11 is detected by the FM detector 12, and is then detected by the stereo demodulator 1.
3 and is separated into an R signal. At the same time, the detected signal is regenerated into a binary data signal by the data demodulator 14,
- Full multiplexer 16 allows L signal expansion data and R
Separated into data for signal expansion. Each data is converted into an analog voltage by a digital-to-analog converter 16.16', which controls a variable amplifier 17.17', and R
Stretch the signal to its original dynamic range. As this expansion method, instead of using a variable amplifier using analog voltage,
FIG. 5 shows an example of a configuration in which the degree of amplification is made variable digitally. Based on the L signal expansion data that is one output of the demultiplexer 16, the analog switch circuit 21 selects one or a combination of input resistors of the operational amplifier 22 from among the input resistors 23. Since the amplification degree of the amplification circuit using the operational amplifier 22 is determined by the ratio of the input resistance and the feedback resistance (resistance 24 in the figure), the above-described configuration can realize the digital variable amplifier 2o without the intervention of an analog voltage. Note that the same applies to the R signal. By the way, 1 4 , 15 in Fig. 4,
16, 16', 17, 17' or 14.15, 20.20' in FIG. 6 can be configured as an independent adapter and used in combination with a conventional FM receiver. In FIG. 6, 26 is an FM receiver, and 26 is an adapter.
現在市販されているＦＭステレオ受信機の多くには図に
示したような検波信号出力端子が設置されており、この
信号とり、Ｒ信号をアダプタ２６に入力して改善された
り、Ｒ信号を得ることができる。Many of the FM stereo receivers currently on the market are equipped with a detection signal output terminal as shown in the figure, and this signal is taken and the R signal is input to the adapter 26 to improve or obtain the R signal. be able to.
以上のように本発明は、従来のＦＭ放送（モノラル、ス
テレオとも）との両立性を有したままで、彦
より本来の音楽ソースに忠実な再生を可能にしたもので
、これ、を実現する電気回路も比較的簡単に構成できる
。また将来リミッティングアンプがデジタル的に制御さ
れるものになれば、圧縮手段。As described above, the present invention enables reproduction more faithful to the original music source while maintaining compatibility with conventional FM broadcasting (both monaural and stereo). The electric circuit can also be constructed relatively easily. In the future, if limiting amplifiers become digitally controlled, compression means will also be used.
圧縮微データ、伸張手段ともデジタル化された極めて合
理的なシステムが構成可能となり、その効果は大である
。It has become possible to construct an extremely rational system in which both compressed fine data and decompression means have been digitized, and the effect is great.
第１図はりミソティングアンプの入出力特性を示す図、
第２図は本発明によるＦＭ放送機の構成例を示すブロッ
ク図、第３図は多重化された変調信号のスペクトラムを
示す図、第４図は本発明によるＦＭデータ多重放送に対
応する受信機の構成例を示すブロック図、第６図は同受
゛信機の他の構成例を示す要部ブロック図、第６図は一
般のＦＭ受信機とアダプタとの接続図である。
１・・・・・可変減衰器、２・・・・・°レベル検出器
、３・・・・・・アナログ−ディジタル変換器、６・・
・・・・副搬送波発振器、９・・・・・・ＦＭ変調器、
１４・・・・・・データ復調器、１６・・・・・・ディ
ジタル−アナログ変換器、１７・・・・・・可変増幅器
、２１・・・・・・アナログスイッチ回路、２２ ・・
・・演算増幅器、２６・・・・・・アダプタ。
第１図
第２図
第３図Figure 1 is a diagram showing the input/output characteristics of a beam soting amplifier,
FIG. 2 is a block diagram showing a configuration example of an FM broadcasting device according to the present invention, FIG. 3 is a diagram showing a spectrum of a multiplexed modulated signal, and FIG. 4 is a receiver compatible with FM data multiplex broadcasting according to the present invention. FIG. 6 is a block diagram showing another example of the configuration of the same receiver, and FIG. 6 is a connection diagram between a general FM receiver and an adapter. 1...Variable attenuator, 2...° level detector, 3...Analog-digital converter, 6...
...subcarrier oscillator, 9...FM modulator,
14... Data demodulator, 16... Digital-to-analog converter, 17... Variable amplifier, 21... Analog switch circuit, 22...
...Operation amplifier, 26...adapter. Figure 1 Figure 2 Figure 3
Claims (1)
声信号と副搬送波を用いたデジタル信号とを多重化して
変調したＦＭ信号を用い、前記デジタル信号は上記圧縮
手段における圧縮量に対応したデータを含むことを特徴
とするＦＭデータ多重放送方法。An FM signal is used that is modulated by multiplexing an audio signal processed by an amplitude compression means with a limited modulation degree and a digital signal using a subcarrier, and the digital signal includes data corresponding to the amount of compression in the compression means. An FM data multiplex broadcasting method characterized by the following.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19143281A JPS5892161A (en) | 1981-11-28 | 1981-11-28 | Method for multiplex broadcasting fm data |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19143281A JPS5892161A (en) | 1981-11-28 | 1981-11-28 | Method for multiplex broadcasting fm data |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5892161A true JPS5892161A (en) | 1983-06-01 |
Family
ID=16274512
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19143281A Pending JPS5892161A (en) | 1981-11-28 | 1981-11-28 | Method for multiplex broadcasting fm data |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5892161A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01291536A (en) * | 1988-05-19 | 1989-11-24 | Nippon Hoso Kyokai <Nhk> | Fm multiplex broadcast outputting device |
| US5666660A (en) * | 1991-05-31 | 1997-09-09 | Telefunken | System for receiving a radio signal including multiple receiving units |
| US5740519A (en) * | 1991-05-31 | 1998-04-14 | Telefunken | Method for the time-correlated transmission of a control signal and a radio program signal |
| US6274248B1 (en) | 1997-12-09 | 2001-08-14 | Namba Press Works Co., Ltd. | Thermoplastic composite composition reinforced with mica and wooden fiber filler |
| US6330334B1 (en) | 1993-03-15 | 2001-12-11 | Command Audio Corporation | Method and system for information dissemination using television signals |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52126102A (en) * | 1976-04-16 | 1977-10-22 | Hitachi Ltd | Transmission and reception system of fm stereo |
-
1981
- 1981-11-28 JP JP19143281A patent/JPS5892161A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52126102A (en) * | 1976-04-16 | 1977-10-22 | Hitachi Ltd | Transmission and reception system of fm stereo |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01291536A (en) * | 1988-05-19 | 1989-11-24 | Nippon Hoso Kyokai <Nhk> | Fm multiplex broadcast outputting device |
| JPH082044B2 (en) * | 1988-05-19 | 1996-01-10 | 日本放送協会 | FM multiplex broadcast transmitter and FM multiplex broadcast receiver |
| US5666660A (en) * | 1991-05-31 | 1997-09-09 | Telefunken | System for receiving a radio signal including multiple receiving units |
| US5740519A (en) * | 1991-05-31 | 1998-04-14 | Telefunken | Method for the time-correlated transmission of a control signal and a radio program signal |
| US6330334B1 (en) | 1993-03-15 | 2001-12-11 | Command Audio Corporation | Method and system for information dissemination using television signals |
| US6274248B1 (en) | 1997-12-09 | 2001-08-14 | Namba Press Works Co., Ltd. | Thermoplastic composite composition reinforced with mica and wooden fiber filler |
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