JPH10107749A - Medium wave radio broadcast system - Google Patents
Medium wave radio broadcast systemInfo
- Publication number
- JPH10107749A JPH10107749A JP25510196A JP25510196A JPH10107749A JP H10107749 A JPH10107749 A JP H10107749A JP 25510196 A JP25510196 A JP 25510196A JP 25510196 A JP25510196 A JP 25510196A JP H10107749 A JPH10107749 A JP H10107749A
- Authority
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- Prior art keywords
- station
- signal
- delay
- audio signal
- medium
- 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.)
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Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は中波ラジオ放送シス
テムに関し、特に同期放送を行う中波ラジオ放送システ
ムに関する。The present invention relates to a medium-wave radio broadcasting system, and more particularly to a medium-wave radio broadcasting system for performing synchronous broadcasting.
【0002】[0002]
【従来の技術】中波ラジオ放送のサービスエリアを拡大
するために、自局の放送機の他に難聴地域に別の局(サ
テライト局)を設けることがある。自局とサテライト局
は例えば同一の周波数で放送することがあって、境界地
域では両局からの受信信号が混合されるため音声歪みが
発生する。この音声歪みを少なくするには、両局から放
送される搬送波周波数が同一であることと、両局からの
放送を受信した場合の音声信号位相が合っていることと
が必要である。この両局から放送される搬送波周波数
と、音声信号の位相とをそれぞれ合致させる放送方式
を、中波ラジオ同期放送と呼ぶ。2. Description of the Related Art In order to expand the service area of a medium-wave radio broadcast, another station (satellite station) may be provided in a hearing-impaired area in addition to its own broadcaster. The own station and the satellite station may broadcast at the same frequency, for example, and in a boundary area, signals received from both stations are mixed, so that audio distortion occurs. In order to reduce the audio distortion, it is necessary that the carrier frequencies broadcast from both stations are the same and that the audio signal phases when broadcasting from both stations are matched. A broadcast system that matches the carrier frequency broadcast from both stations with the phase of the audio signal is called a medium-wave radio synchronous broadcast.
【0003】従来の中波ラジオ同期放送システムとして
は、例えば特開平2−15730号公報に記載されたよ
うなものがある。この特開平2−15730号公報に記
載された中波ラジオ同期放送システムの例を図2に示
す。[0003] As a conventional medium-wave radio synchronous broadcasting system, for example, there is one disclosed in Japanese Patent Application Laid-Open No. 15730/1990. FIG. 2 shows an example of a medium-wave radio synchronous broadcasting system described in Japanese Patent Laid-Open No. 15730/1990.
【0004】図2において、2−1は同一周波数の搬送
波周波数で送信するA局(自局)の送信機、10−1は
その送信アンテナ、22はA局における変調音声信号、
23はB局(サテライト局)における送信機2−2へ入
力する変調音声信号、12はB局の送信機2−2へ変調
音声信号を伝送する回路網、20はB局の送信アンテナ
10−2より送信された送信波を受信する受信装置とし
ての受信アンテナ、21は同じく受信装置としての受信
機、11−1は変調音声信号22の遅延時間を可変でき
る可変音声遅延線、8は受信機21の復調音声出力と可
変音声遅延線11−1の出力である変調音声出力を位相
比較する補正装置としての位相比較器、9はこの位相比
較器8の出力電圧を読み込み、可変音声遅延線11−1
を可変動作させる制御信号を出力する補正装置としての
制御器である。24は制御器9より可変音声遅延線11
−1への上記制御信号を示す。In FIG. 2, reference numeral 2-1 denotes a transmitter of station A (own station) for transmitting at the same carrier frequency, reference numeral 10-1 denotes its transmitting antenna, reference numeral 22 denotes a modulated voice signal of station A,
Reference numeral 23 denotes a modulated voice signal input to the transmitter 2-2 of the station B (satellite station), reference numeral 12 denotes a circuit network for transmitting the modulated voice signal to the transmitter 2-2 of the station B, and reference numeral 20 denotes a transmitting antenna 10- of the station B. 2, a receiving antenna as a receiving device for receiving a transmission wave transmitted from 2, a receiver 21 as a receiving device, 11-1 a variable audio delay line capable of varying the delay time of the modulated audio signal 22, and 8 a receiver The phase comparator 9 corrects the phase of the demodulated audio output 21 and the modulated audio output which is the output of the variable audio delay line 11-1. The phase comparator 9 reads the output voltage of the phase comparator 8 and -1
Is a controller as a correction device that outputs a control signal for variably operating. 24 is a variable audio delay line 11 from the controller 9
The above control signal to -1 is shown.
【0005】次に動作を説明する。今、A局の放送停止
中において、受信アンテナ20は、B局の送信アンテナ
10−2より送信された送信波を受信することができ
る。今、A局、B局への変調音声信号22,23として
例えば基準周波数(例えば1kHzとする)の変調音声
信号を送ったとき、B局の送信機2−2は該変調音声信
号23を1kHzで変調し送信するので、受信機21の
出力としては、B局で送信された変調波を復調した1k
Hzの信号が得られる。しかして、この1kHzの復調
信号は位相比較器8に入力される。Next, the operation will be described. Now, while the broadcasting of the station A is stopped, the receiving antenna 20 can receive the transmission wave transmitted from the transmitting antenna 10-2 of the station B. Now, when a modulated audio signal having a reference frequency (for example, 1 kHz) is transmitted as the modulated audio signals 22 and 23 to the stations A and B, the transmitter 2-2 of the station B transmits the modulated audio signal 23 at 1 kHz. , And the output of the receiver 21 is 1 k obtained by demodulating the modulated wave transmitted from the B station.
Hz signal is obtained. The 1 kHz demodulated signal is input to the phase comparator 8.
【0006】一方、A局での変調音声信号22は、可変
音声遅延線11−1に入力された後、位相比較器8へ入
力される。従って位相比較器8の出力としては、両者の
位相差に伴った電圧が得られる。制御器9においては、
この出力電圧を読み、両者の位相差が一定となるよう
に、可変音声遅延線11−1の遅延時間を制御すると共
に、その制御値を記憶しておく。On the other hand, the modulated audio signal 22 at the station A is input to the variable audio delay line 11-1, and then to the phase comparator 8. Therefore, as the output of the phase comparator 8, a voltage corresponding to the phase difference between the two is obtained. In the controller 9,
This output voltage is read, the delay time of the variable audio delay line 11-1 is controlled so that the phase difference between them is constant, and the control value is stored.
【0007】A局の放送開始後は、受信機21はB局の
送信波が受信不可能であるので、制御器9は、上記記憶
した制御値により、可変音声遅延線11−1の遅延時間
を制御する。After the broadcast of the station A starts, the receiver 21 cannot receive the transmission wave of the station B. Therefore, the controller 9 determines the delay time of the variable audio delay line 11-1 based on the stored control value. Control.
【0008】ただし、この制御値には、A局の送信機2
−1による遅延時間分は含まれていないため、送信機2
−1の遅延時間を補正した制御値により、上記A局の放
送時には、可変音声遅延線11−1を制御する。However, this control value includes the transmitter 2 of the station A.
-1 is not included, so that the transmitter 2
The variable audio delay line 11-1 is controlled by the control value obtained by correcting the delay time of -1 during the broadcasting of the station A.
【0009】以上のようにして、放送停止毎に、位相比
較器8及び制御器9からなる補正装置により再補正が行
われるので、回路網12の変更時における遅延時間の変
動補正を恒久的に、確実に行うことができるとされてい
る。As described above, every time the broadcast is stopped, the correction device including the phase comparator 8 and the controller 9 performs the re-correction. Therefore, the fluctuation of the delay time when the circuit network 12 is changed is permanently corrected. It can be performed reliably.
【0010】[0010]
【発明が解決しようとする課題】図2に示す特開平2−
15730号公報に記載された中波ラジオ同期放送シス
テムでは、A局(自局;主局)の放送停止中でなけれ
ば、A局の近くにあってA局の送信波の電界強度が強い
ところにある受信アンテナ20、受信機21では、B局
(従局;サテライト局)の送信波を受信することは不可
能であって、可変音声遅延線11−1の制御信号24を
得ることができない問題がある。SUMMARY OF THE INVENTION FIG.
In the medium-wave radio synchronous broadcasting system described in Japanese Patent No. 15730, unless the broadcasting of the station A (own station; master station) is stopped, the station is located near the station A and the electric field strength of the transmission wave of the station A is high. Cannot receive the transmission wave of the B station (slave station; satellite station) and cannot obtain the control signal 24 of the variable audio delay line 11-1. There is.
【0011】また、この場合、可変音声遅延線11−1
が主局(A局)側にあるため、サテライト局(B局;従
局)が複数ある時には適用できない問題もある。In this case, the variable audio delay line 11-1
Is located on the master station (station A) side, there is a problem that this cannot be applied when there are a plurality of satellite stations (station B; slave stations).
【0012】本発明の目的は、主局が放送中にも、サテ
ライト局が複数ある場合にも、正確に音声信号位相が同
期できる、中波ラジオ同期放送システムの中波ラジオ放
送システムを提供することである。An object of the present invention is to provide a medium-wave radio broadcast system which can accurately synchronize the phase of an audio signal even when the main station is broadcasting or when there are a plurality of satellite stations. That is.
【0013】[0013]
【課題を解決するための手段】本発明によれば、中波ラ
ジオ放送局である主局の放送音声信号にパイロット信号
を重畳し、第一の音声信号として第一の伝送路を通じて
従局へ送って、前記従局が前記パイロット信号を基に前
記主局と同一の搬送波を発生し、前記従局が前記主局と
同一の搬送波を、前記第一の伝送路を通じて得た前記第
一の音声信号から前記パイロット信号を除いた信号で変
調して放送する中波ラジオ同期放送システムであって、
前記主局の送信機の入力部に挿入され前記放送音声信号
に固定の遅延を与える第一の遅延手段と、前記従局の送
信機の入力部に挿入され前記放送音声信号に可変の遅延
を与える第二の遅延手段と、前記従局において前記第一
の伝送路を通じて得た前記第一の音声信号を第二の伝送
路を通じて前記主局側に第二の音声信号として送り返す
手段と、前記主局側で前記第一及び第二の音声信号を位
相比較して前記第一の伝送路による前記第一の音声信号
の遅延量を測定して前記第二の遅延手段を制御する音声
信号遅延制御手段とを含むことを特徴とする中波ラジオ
放送システムが得られる。According to the present invention, a pilot signal is superimposed on a broadcast audio signal of a master station, which is a medium-wave radio broadcast station, and transmitted as a first audio signal to a slave station through a first transmission path. The slave station generates the same carrier as the master station based on the pilot signal, and the slave station obtains the same carrier as the master station from the first audio signal obtained through the first transmission path. A medium-wave radio synchronous broadcasting system for modulating and broadcasting with a signal excluding the pilot signal,
First delay means inserted into the input section of the master station transmitter to provide a fixed delay to the broadcast audio signal; and inserted into the input section of the slave station transmitter to provide a variable delay to the broadcast audio signal Second delay means, means for sending back the first audio signal obtained through the first transmission path in the slave station to the master station side as a second audio signal through a second transmission path, Audio signal delay control means for controlling the second delay means by comparing the phase of the first and second audio signals on the side and measuring the amount of delay of the first audio signal by the first transmission line And a medium-wave radio broadcasting system characterized by including the following.
【0014】本発明の作用は次の通りである。A局(主
局)側で音声放送プログラム(音声信号)にパイロット
信号を多重し、例えば公衆電話回線を通じて、B局(従
局;サテライト局)側へ伝送する。同時に別の公衆電話
回線を通じて、音声信号をA局側へ送り返し、送り返さ
れた音声信号と元の音声信号とを、パイロット信号につ
いて位相比較し、制御処理ユニットを介して、B局側の
音声遅延ユニットを制御する。The operation of the present invention is as follows. The station A (master station) multiplexes the pilot signal with the audio broadcasting program (audio signal), and transmits the multiplexed signal to the station B (slave station; satellite station) through, for example, a public telephone line. At the same time, the voice signal is sent back to the A station through another public telephone line, the returned voice signal and the original voice signal are compared in phase with respect to the pilot signal, and the voice delay at the B station is transmitted via the control processing unit. Control the unit.
【0015】[0015]
【発明の実施の形態】以下に、本発明の実施例について
図面を参照して説明する。Embodiments of the present invention will be described below with reference to the drawings.
【0016】図1は本発明による中波ラジオ放送システ
ムの実施例の構成を示すブロック図であり、図2と同等
部分は同一符号にて示している。なお、重複する説明は
省略する。FIG. 1 is a block diagram showing the configuration of an embodiment of a medium-wave radio broadcasting system according to the present invention, and the same parts as those in FIG. 2 are denoted by the same reference numerals. In addition, overlapping description is omitted.
【0017】図1に示すように、放送プログラム(音声
信号)1に一定の遅延量(t1)を与える音声遅延ユニ
ット11−1、遅延された音声信号1を変調・増幅して
送信アンテナ10−1を介して放送する送信機(Tx)
2−1、パイロット信号(例えば10〜20kHz)を
発生するパイロット信号発生器4、パイロット信号を逓
倍して(中波帯の)搬送波を発生し、送信機2−1に供
給する搬送波発生装置6−1、A局(自局;主局)、B
局(従局;サテライト局)とも放送運用中であっても、
B局側の音声遅延量を調整可能11−2となるように、
パイロット信号を音声信号1に重畳させるパイロット信
号多重ユニット3、プログラム伝送路12−1にてB局
側に伝送された音声信号5−1を、別の伝送路12−2
を通じてA局側へ送り返し、送り返された音声信号5−
2と元の音声信号5−1とを、重畳されたパイロット信
号の位相について比較する比較回路8、比較回路8の出
力電圧を基に、B局側の音声遅延ユニット11−2を制
御する制御信号24を発生する制御処理ユニット9が、
A局側の放送装置を構成する。As shown in FIG. 1, an audio delay unit 11-1 for giving a fixed delay amount (t1) to a broadcast program (audio signal) 1 modulates and amplifies the delayed audio signal 1 and transmits the amplified signal to a transmission antenna 10-. Transmitter (Tx) broadcasting via 1
2-1, a pilot signal generator 4 for generating a pilot signal (for example, 10 to 20 kHz), a carrier wave generator 6 for generating a carrier (in the medium wave band) by multiplying the pilot signal and supplying the carrier to the transmitter 2-1 -1, station A (own station; master station), B
Even if both stations (slave stations; satellite stations) are broadcasting,
To be able to adjust the audio delay amount on the B station side 11-2,
The pilot signal multiplexing unit 3 for superimposing the pilot signal on the audio signal 1 and the audio signal 5-1 transmitted to the B station side in the program transmission path 12-1 are transmitted to another transmission path 12-2.
To the A station side through
2 and the original audio signal 5-1 for comparing the phase of the superimposed pilot signal, and a control for controlling the audio delay unit 11-2 on the B station side based on the output voltage of the comparison circuit 8. The control processing unit 9 that generates the signal 24
The broadcasting device on the station A side is configured.
【0018】プログラム伝送路12−1を通じてB局側
へ伝送された音声信号5−1を、パイロット信号とプロ
グラム(音声)信号とに分離するプログラム分離ユニッ
ト7、分離されたパイロット信号を逓倍して、搬送波発
生装置6−1の出力と同一の周波数を持つ搬送波を発生
して、送信機2−2に供給する搬送波発生装置6−1、
分離された音声信号に可変遅延(t2)を与えて、送信
機2−2に供給する音声遅延ユニット11−2、搬送波
を音声遅延ユニット11−2の出力の音声信号で振幅変
調して、送信アンテナ10−2を介して放送する送信機
2−2が、B局側の放送装置を構成する。A program separation unit 7 for separating the audio signal 5-1 transmitted to the B station side through the program transmission line 12-1 into a pilot signal and a program (voice) signal, and multiplies the separated pilot signal. , A carrier wave generator 6-1 that generates a carrier having the same frequency as the output of the carrier wave generator 6-1 and supplies the carrier to the transmitter 2-2.
A variable delay (t2) is given to the separated voice signal, a voice delay unit 11-2 to be supplied to a transmitter 2-2, and a carrier wave are amplitude-modulated by a voice signal output from the voice delay unit 11-2, and transmitted. The transmitter 2-2 for broadcasting via the antenna 10-2 constitutes a broadcasting device on the B station side.
【0019】本発明の実施例の動作を説明すると、演奏
所(図示せず)から伝送されてきた放送プログラム(音
声信号)1は、A局の音声遅延ユニット11−1を介し
て送信機2−1に入力されると同時に、パイロット信号
多重ユニット3に入力され、パイロット信号発生器4か
らのパイロット信号を重畳して、音声信号5−1として
プログラム伝送路12−1を介してB局に伝送される。The operation of the embodiment of the present invention will be described. A broadcast program (audio signal) 1 transmitted from a music hall (not shown) is transmitted to a transmitter 2 via an audio delay unit 11-1 of the A station. -1 and at the same time, the signal is input to the pilot signal multiplexing unit 3 and superimposed with the pilot signal from the pilot signal generator 4 to the station B as the audio signal 5-1 via the program transmission line 12-1. Transmitted.
【0020】B局に伝送された音声信号5−1は、プロ
グラム分離ユニット7に入力されると同時に、プログラ
ム伝送路12−2を介して、音声信号5−2としてA局
に送り返され、比較回路8に音声信号5−1とともに入
力され、両信号5−1,2のパイロット信号位相が位相
比較される。The audio signal 5-1 transmitted to the station B is input to the program separation unit 7 and, at the same time, is sent back to the station A as an audio signal 5-2 via the program transmission line 12-2. The signal 8 is input to the circuit 8 together with the audio signal 5-1, and the phases of the pilot signals of the two signals 5-1 and 5-1 are compared.
【0021】プログラム伝送路12−1,2としては、
公衆電話回線を用いるものとすると、その伝送帯域幅は
狭く、遅延時間が大きい。比較回路8の出力は、このプ
ログラム伝送路12−1,2の遅延時間に対応する。プ
ログラム伝送路12−1及び2は全く同じ遅延時間を持
つので、比較回路8の出力はA,B局間のプログラム伝
送路12−1の遅延時間の2倍に比例する。As the program transmission paths 12-1 and 12-2,
If a public telephone line is used, the transmission bandwidth is narrow and the delay time is large. The output of the comparison circuit 8 corresponds to the delay time of the program transmission paths 12-1 and 12-2. Since the program transmission lines 12-1 and 2 have exactly the same delay time, the output of the comparison circuit 8 is proportional to twice the delay time of the program transmission line 12-1 between the A and B stations.
【0022】B局の放送される音声信号の位相は、A局
の放送される音声信号の位相に比べて、ほぼプログラム
伝送路12−1の遅延時間だけ遅れるので、A局側に固
定遅延(t1)を与える音声遅延ユニット11−1を挿
入する。B局側の音声遅延ユニット11−2の可変遅延
量(t2)に比べ、t1>t2に選ぶことにより、音声遅
延ユニット11−2の可変遅延量(t2)を制御信号2
4によって制御して、A,B局から放送された音声信号
(プログラム)の位相を合致させることができる。Since the phase of the audio signal broadcasted by the station B is delayed from the phase of the audio signal broadcasted by the station A by almost the delay time of the program transmission path 12-1, a fixed delay ( An audio delay unit 11-1 that provides t1) is inserted. By selecting t1> t2 as compared with the variable delay amount (t2) of the audio delay unit 11-2 on the B station side, the variable delay amount (t2) of the audio delay unit 11-2 is controlled by the control signal 2
4, the phases of audio signals (programs) broadcast from stations A and B can be matched.
【0023】なお、制御信号24は、A局からB局へ伝
送する必要があるので、ディジタル信号の形になってい
るのが適当である。Since the control signal 24 needs to be transmitted from the station A to the station B, it is appropriate to be in the form of a digital signal.
【0024】パイロット信号は、システムによっては複
数を要する場合もあるが、本発明の実施例の場合、例え
ば10〜20kHzの単一の正弦波で充分である。Although a plurality of pilot signals may be required depending on the system, in the embodiment of the present invention, a single sine wave of, for example, 10 to 20 kHz is sufficient.
【0025】[0025]
【発明の効果】以上説明したように本発明は、公衆回線
等の伝送路を使って音声信号を従局側から主局側へ送り
返し、伝送路の音声信号に対する遅延量を測定して、従
局側の音声遅延ユニットを制御することにより、主局、
従局とも放送運用中であっても、伝送路の変更に対応し
て、中波ラジオ同期放送が常に正常に維持される効果が
ある。As described above, according to the present invention, an audio signal is sent back from a slave station to a master station using a transmission line such as a public line, and the delay amount of the audio signal on the transmission line is measured. By controlling the audio delay unit of the master station,
Even when the slave station is in the broadcasting operation, the medium-wave radio synchronous broadcasting is always normally maintained in response to the change of the transmission path.
【0026】また、制御される音声遅延ユニットが従局
側に挿入されるため、従局が複数存在していても対応で
きる効果もある。Also, since the voice delay unit to be controlled is inserted on the slave station side, there is an effect that even if a plurality of slave stations exist, it can be handled.
【図1】本発明の実施例のブロック図である。FIG. 1 is a block diagram of an embodiment of the present invention.
【図2】従来の中波ラジオ同期放送システムの一例のブ
ロック図である。FIG. 2 is a block diagram of an example of a conventional medium-wave radio synchronous broadcasting system.
1 放送プログラム 2−1,2 送信機 3 パイロット信号多重ユニット 4 パイロット信号発生器 5−1,2 音声信号 6−1,2 搬送波発生装置 7 プログラム分離ユニット 8 比較回路 9 制御処理ユニット 10−1,2 送信アンテナ 11−1,2 音声遅延ユニット 12−1,2 プログラム伝送路 24 制御信号 DESCRIPTION OF SYMBOLS 1 Broadcast program 2-1 and 2 transmitter 3 Pilot signal multiplexing unit 4 Pilot signal generator 5-1 and 2 audio signal 6-1 and 2 Carrier generator 7 Program separation unit 8 Comparison circuit 9 Control processing unit 10-1 2 Transmission antenna 11-1, Audio delay unit 12-1, Program transmission path 24 Control signal
Claims (5)
信号にパイロット信号を重畳し、第一の音声信号として
第一の伝送路を通じて従局へ送って、前記従局が前記パ
イロット信号を基に前記主局と同一の搬送波を発生し、
前記従局が前記主局と同一の搬送波を、前記第一の伝送
路を通じて得た前記第一の音声信号から前記パイロット
信号を除いた信号で変調して放送する中波ラジオ同期放
送システムであって、前記主局の送信機の入力部に挿入
され前記放送音声信号に固定の遅延を与える第一の遅延
手段と、前記従局の送信機の入力部に挿入され前記放送
音声信号に可変の遅延を与える第二の遅延手段と、前記
従局において前記第一の伝送路を通じて得た前記第一の
音声信号を第二の伝送路を通じて前記主局側に第二の音
声信号として送り返す手段と、前記主局側で前記第一及
び第二の音声信号を位相比較して前記第一の伝送路によ
る前記第一の音声信号の遅延量を測定して前記第二の遅
延手段を制御する音声信号遅延制御手段とを含むことを
特徴とする中波ラジオ放送システム。1. A pilot signal is superimposed on a broadcast audio signal of a master station, which is a medium-wave radio broadcast station, and is sent as a first audio signal to a slave station through a first transmission path. Generates the same carrier as the main station,
A medium-wave radio synchronous broadcasting system in which the slave station modulates the same carrier as the master station with a signal obtained by removing the pilot signal from the first audio signal obtained through the first transmission path and broadcasts. A first delay unit inserted into the input unit of the transmitter of the master station to give a fixed delay to the broadcast audio signal; and a variable delay inserted into the input unit of the transmitter of the slave station to provide a variable delay to the broadcast audio signal. Second delay means for giving, a means for sending back the first audio signal obtained through the first transmission path in the slave station to the master station side as a second audio signal through a second transmission path, An audio signal delay control for controlling the second delay means by measuring the delay amount of the first audio signal by the first transmission line by comparing the phases of the first and second audio signals at the station side; And a medium wave. Oh broadcasting system.
二の遅延手段の遅延量より大きいことを特徴とする請求
項1記載の中波ラジオ放送システム。2. The medium-wave radio broadcasting system according to claim 1, wherein a delay amount of said first delay means is larger than a delay amount of said second delay means.
電話回線であることを特徴とする請求項1あるいは2記
載の中波ラジオ放送システム。3. The medium-wave radio broadcasting system according to claim 1, wherein said first and second transmission lines are the same kind of public telephone lines.
の形の制御信号で制御されることを特徴とする請求項
1,2あるいは3記載の中波ラジオ放送システム。4. A medium-wave radio broadcasting system according to claim 1, wherein said second delay means is controlled by a control signal in the form of a digital signal.
であることを特徴とする請求項1,2,3あるいは4記
載の中波ラジオ放送システム。5. The medium-wave radio broadcasting system according to claim 1, wherein said pilot signal is one kind of sine wave.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP25510196A JPH10107749A (en) | 1996-09-26 | 1996-09-26 | Medium wave radio broadcast system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP25510196A JPH10107749A (en) | 1996-09-26 | 1996-09-26 | Medium wave radio broadcast system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH10107749A true JPH10107749A (en) | 1998-04-24 |
Family
ID=17274133
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP25510196A Withdrawn JPH10107749A (en) | 1996-09-26 | 1996-09-26 | Medium wave radio broadcast system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH10107749A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006005615A (en) * | 2004-06-17 | 2006-01-05 | Eiden Kk | Single-frequency network digital terrestrial broadcasting system, synchronization system for single-frequency network, and transmitting device |
JP2017092901A (en) * | 2015-11-17 | 2017-05-25 | 日本通信機株式会社 | Synchronous broadcasting system, and transmitting device |
-
1996
- 1996-09-26 JP JP25510196A patent/JPH10107749A/en not_active Withdrawn
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006005615A (en) * | 2004-06-17 | 2006-01-05 | Eiden Kk | Single-frequency network digital terrestrial broadcasting system, synchronization system for single-frequency network, and transmitting device |
JP2017092901A (en) * | 2015-11-17 | 2017-05-25 | 日本通信機株式会社 | Synchronous broadcasting system, and transmitting device |
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Legal Events
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A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20031202 |