JPH07245574A - Digital signal transmission method - Google Patents
Digital signal transmission methodInfo
- Publication number
- JPH07245574A JPH07245574A JP6036014A JP3601494A JPH07245574A JP H07245574 A JPH07245574 A JP H07245574A JP 6036014 A JP6036014 A JP 6036014A JP 3601494 A JP3601494 A JP 3601494A JP H07245574 A JPH07245574 A JP H07245574A
- Authority
- JP
- Japan
- Prior art keywords
- transmission method
- information
- digital signal
- transmitted
- ofdm
- 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
(57)【要約】
【目的】 伝送誤りを削減したディジタル信号伝送方法
を提供する。
【構成】 ＯＦＤＭ（直交周波数分割多重）ディジタル
信号伝送方法により送られる信号とＳＳ（スペクトラム
拡散）伝送方法により送られる信号を多重して伝送する
ことにより、ＯＦＤＭ信号が受信できないような劣悪な
受信状態の場合であっても、ＳＳ信号を受信することに
よって致命的な誤りを減らすよう構成した。
(57) [Abstract] [Purpose] To provide a digital signal transmission method with reduced transmission errors. [Structure] A poor reception state in which an OFDM signal cannot be received by multiplexing and transmitting a signal transmitted by an OFDM (Orthogonal Frequency Division Multiplexing) digital signal transmission method and a signal transmitted by an SS (spread spectrum) transmission method. In this case, the fatal error is reduced by receiving the SS signal.
Description
【０００１】[0001]
【産業上の利用分野】この発明は、ディジタル放送の伝
送方法に係り、特に直交周波数分割多重（以下ＯＦＤＭ
と称す）ディジタル信号伝送方法により伝送される信号
に、スペクトル拡散（以下ＳＳと称す）伝送方法により
伝送される信号を多重するディジタル信号伝送方法に関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital broadcasting transmission method, and more particularly to orthogonal frequency division multiplexing (hereinafter referred to as OFDM).
The present invention relates to a digital signal transmission method in which a signal transmitted by a digital signal transmission method is multiplexed with a signal transmitted by a spread spectrum (hereinafter referred to as SS) transmission method.
【０００２】[0002]
【従来の技術】従来は、ある与えられた周波数帯域を有
するチャンネルで、ＯＦＤＭディジタル信号伝送方法だ
けを単独で利用する伝送方法、ＳＳ伝送方法だけを単独
で利用する伝送方法は存在している。2. Description of the Related Art Conventionally, there are a transmission method that uses only an OFDM digital signal transmission method alone and a transmission method that uses only an SS transmission method in a channel having a given frequency band.
【０００３】[0003]
【発明が解決しようとする課題】ディジタル信号の伝送
を行なう場合、同期などの制御情報が妨害によって誤り
を生じるとその影響は大きい。つまり、情報の重要度に
差があるのが一般的である。ＯＦＤＭディジタル伝送方
法単独やＳＳ伝送方法単独では送信する情報の重要度に
応じて伝送の強さを変えることは複雑になり経済的にも
困難である。また、重要度に応じて伝送方法の種類を変
えたとしても伝送方法の種類分の別々の周波数帯域のチ
ャンネルが必要であった。When transmitting a digital signal, if control information such as synchronization causes an error due to interference, its effect is great. In other words, there is a general difference in the importance of information. With the OFDM digital transmission method alone or the SS transmission method alone, it is complicated and economically difficult to change the transmission strength according to the importance of the information to be transmitted. Further, even if the type of transmission method is changed according to the degree of importance, channels of different frequency bands corresponding to the type of transmission method are required.
【０００４】そこで本発明の目的は、ＯＦＤＭディジタ
ル伝送信号が受信できないような劣悪な受信状態の場合
であっても、ＳＳ伝送信号を受信することによって致命
的な受信誤りを削減できるディジタル信号伝送方法を提
供せんとするものである。Therefore, an object of the present invention is to provide a digital signal transmission method capable of reducing fatal reception errors by receiving an SS transmission signal even in a poor reception state where an OFDM digital transmission signal cannot be received. Is intended to be provided.
【０００５】[0005]
【課題を解決するための手段】この目的を達成するため
本発明によれば、例えば図１に示すようにＳＳ伝送方法
を使って重要度の高い情報を、ＯＦＤＭディジタル信号
伝送方法を使ってその他の情報を同じ周波数帯域のチャ
ンネルを使って伝送する。ＳＳ伝送方法により伝送され
た信号からみればＯＦＤＭディジタル信号伝送方法によ
り伝送された信号は妨害となるが、ＳＳ伝送方法により
伝送される情報のビットレートを十分低くすればＳＳの
処理利得がとれることにより、ＯＦＤＭディジタル信号
伝送方法により伝送された信号からの妨害は復調上問題
とならない。一方、ＯＦＤＭディジタル信号伝送方法に
より伝送された信号も、ＳＳ伝送方法で伝送された信号
は妨害となるが信号レベルが低く問題とならない。した
がって、同じチャンネルで送ってもどちらも復調可能で
ある。To achieve this object, according to the present invention, for example, as shown in FIG. 1, SS transmission method is used to transmit important information, and OFDM digital signal transmission method is used to transmit other important information. Information is transmitted using channels in the same frequency band. The signal transmitted by the OFDM digital signal transmission method interferes with the signal transmitted by the SS transmission method, but the processing gain of the SS can be obtained if the bit rate of the information transmitted by the SS transmission method is sufficiently low. Therefore, the interference from the signal transmitted by the OFDM digital signal transmission method does not cause any problem in demodulation. On the other hand, also with respect to the signal transmitted by the OFDM digital signal transmission method, the signal transmitted by the SS transmission method interferes, but the signal level is low and no problem occurs. Therefore, both can be demodulated even if they are sent on the same channel.
【０００６】伝送上の妨害の程度によっては、ＳＳ伝送
方法による伝送においては誤りを生じないが、ＯＦＤＭ
ディジタル信号伝送方法による伝送では誤りが生じる場
合があるが、このような妨害程度の場合、従来のＯＦＤ
Ｍディジタル信号伝送方法のみによる場合は、情報が致
命的な誤りに侵されていたが、本発明方法の場合は致命
的な誤りを回避できる。Depending on the degree of interference in transmission, no error occurs in transmission by the SS transmission method.
An error may occur in the transmission by the digital signal transmission method, but in the case of such an interference degree, the conventional OFD is used.
In the case of only the M digital signal transmission method, the information was affected by a fatal error, but in the case of the method of the present invention, the fatal error can be avoided.
【０００７】[0007]
【実施例】以下添付図面を参照し実施例により本発明を
詳細に説明する。実施例１ 図２は、この本発明であるＯＦＤＭとＳＳの多重伝送を
利用した場合の実施例１の構成図でる。ＯＦＤＭはフレ
ームという情報単位を構成している。この同期が崩れる
と情報は乱れてしまう。ＯＦＤＭ３，７のシンボルレー
トと同じビットレートを持つフレーム同期用ＰＮ系列を
フレーム同期発生器１により発生し、ＳＳ変調器２によ
りＳＳ伝送方法で伝送する。ＳＳ復調器５によりＳＳ信
号を受け、フレーム同期再生器６によりフレーム同期用
ＰＮ系列を再生する。フレーム同期用ＰＮ系列はＳＳ伝
送方法によって伝送しているのである程度の妨害が生じ
ても同期は確立できる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings. First Embodiment FIG. 2 is a configuration diagram of a first embodiment when the multiplex transmission of OFDM and SS according to the present invention is used. OFDM constitutes an information unit called a frame. If this synchronization is lost, the information will be disturbed. A frame synchronization PN sequence having the same bit rate as the symbol rates of OFDM 3 and 7 is generated by the frame synchronization generator 1 and transmitted by the SS modulator 2 by the SS transmission method. The SS demodulator 5 receives the SS signal, and the frame synchronization reproducer 6 reproduces the PN sequence for frame synchronization. Since the PN sequence for frame synchronization is transmitted by the SS transmission method, synchronization can be established even if some interference occurs.
【０００８】実施例２ 図３は、この本発明であるＯＦＤＭとＳＳの多重伝送を
利用した場合の実施例２の構成図である。伝送情報を重
要度により分別８し、重要な情報はＳＳ伝送方法２，５
により伝送し、その他の情報はＯＦＤＭ伝送方法３，７
により伝送する。情報とはＭＰＥＧ（Moving Picture C
oding Expert Gronp)II で符号化された映像情報であ
る。この映像情報の中には重要度の高い情報としてＧ．
Ｏ．Ｐ．（Group of Pictures ）のヘッダ情報が含まれ
ている。情報分別８においては、情報の重要度の高い
Ｇ．Ｏ．Ｐ．のヘッダ情報と他の情報とを分別する。重
要度の高いＧ．Ｏ．Ｐ．のヘッダ情報はＳＳ伝送方法
２，５による伝送とし、その他の情報はＯＦＤＭ伝送方
法３，７による伝送とする。ＳＳ変調２においてＧ．
Ｏ．Ｐ．のヘッダ情報をＳＳ伝送方法で使われる変調方
法で変調する。ＯＦＤＭ変調３においてはＧ．Ｏ．Ｐ．
のヘッダ情報以外の情報をＯＦＤＭディジタル変調す
る。加算器４において各変調器で変調された信号を同一
チャンネルに多重する。多重後のスペクトルは図１のよ
うになる。伝送された信号はＳＳ復調器５とＯＦＤＭ復
調器７に入力する。ＳＳ復調器５においてＧ．Ｏ．Ｐ．
のヘッダ情報は復号される。ＳＳ復調器においては、低
ビットレートの情報が送られているので、ＳＳの処理利
得が高くとれることによりＯＦＤＭ伝送方法で伝送され
た信号の妨害を除去することが可能である。通常の伝送
妨害に対しても、ＳＳ伝送方法であるので強い。ＯＦＤ
Ｍ復調器７においてはＧ．Ｏ．Ｐ．のヘッダ情報以外の
情報を復調する。ＯＦＤＭ復調器において、ＳＳ伝送方
法で伝送された信号は妨害となるが信号レベルが低く問
題とならない。情報合成９においてＧ．Ｏ．Ｐ．のヘッ
ダ情報とその他の情報を合成する。 Second Embodiment FIG. 3 is a configuration diagram of a second embodiment when the multiplex transmission of OFDM and SS according to the present invention is used. The transmission information is classified according to the importance 8 and the important information is SS transmission method 2, 5
Other information is transmitted by the OFDM transmission method 3, 7
To transmit. Information is MPEG (Moving Picture C)
It is video information coded by oding Expert Gronp) II. Among the video information, G.
O. P. (Group of Pictures) header information is included. In the information classification 8, the G. O. P. The header information of is separated from other information. G. with high importance O. P. Header information is transmitted by the SS transmission methods 2 and 5, and other information is transmitted by the OFDM transmission methods 3 and 7. In SS modulation 2, G.
O. P. Header information is modulated by the modulation method used in the SS transmission method. In OFDM modulation 3, G. O. P.
Information other than the header information of is digitally modulated by OFDM. The signals modulated by the respective modulators in the adder 4 are multiplexed on the same channel. The spectrum after multiplexing is as shown in FIG. The transmitted signal is input to the SS demodulator 5 and the OFDM demodulator 7. In the SS demodulator 5, the G. O. P.
Header information of is decoded. Since low-bit-rate information is sent to the SS demodulator, it is possible to remove the interference of the signal transmitted by the OFDM transmission method because the processing gain of SS is high. The SS transmission method is also strong against normal transmission interference. OFD
In the M demodulator 7, the G.M. O. P. Information other than the header information of is demodulated. In the OFDM demodulator, the signal transmitted by the SS transmission method interferes, but the signal level is low and does not pose a problem. In information synthesis 9, G. O. P. Combine the header information and other information of.
【０００９】ＯＦＤＭ信号とＳＳ信号のレベル比の例を
示す。レベル比の下限は、ＯＦＤＭ伝送方法により送信
した情報を正しく復調するために必要なＣ／Ｎ（搬送波
電力対雑音電力）に等しい。レベル比の上限は、ＳＳ伝
送方法によって送信する情報の伝送速度により規定され
る。伝送周波数帯域幅を６ＭＨｚとする。ＯＦＤＭの各
搬送波の変調方法をＱＰＳＫとすると、正しく復調する
ために必要なビット誤り率１０-3を確保するために必要
なＣ／Ｎは１２．５ｄＢである。また、ＳＳ伝送方法に
より伝送するデータの伝送速度を１ｋｂｐｓ以上とした
い場合には、レベル比を２５．８ｄＢ以下としなければ
ならない。An example of the level ratio between the OFDM signal and the SS signal will be shown. The lower limit of the level ratio is equal to C / N (carrier power to noise power) required to correctly demodulate the information transmitted by the OFDM transmission method. The upper limit of the level ratio is defined by the transmission rate of information transmitted by the SS transmission method. The transmission frequency bandwidth is 6 MHz. If the modulation method of each carrier wave of OFDM is QPSK, the C / N necessary to secure the bit error rate 10 −3 necessary for correct demodulation is 12.5 dB. Further, when the transmission rate of data transmitted by the SS transmission method is desired to be 1 kbps or higher, the level ratio must be 25.8 dB or lower.
【００１０】例えば、ＯＦＤＭ信号とＳＳ信号のレベル
比を２５ｄＢとする。また、ＯＦＤＭ搬送波電力対雑音
電力が１０ｄＢとなるような雑音電力であるとする。こ
の場合、ＯＦＤＭ伝送方法により送信される信号は正し
く複号できないが、ＳＳ伝送方法によって送信される信
号は復号可能である。ＳＳ伝送方法で重要度の高いＧ．
Ｏ．Ｐ．のヘッダ情報を送ると、Ｇ．Ｏ．Ｐ．のヘッダ
情報には誤りが生じないのでＧ．Ｏ．Ｐ．のヘッダ情報
は正しく復号できる。Ｇ．Ｏ．Ｐ．のヘッダ情報が正し
く受信できていれば妨害が改善された場合に早く正常な
状態に戻る可能性が高まる。For example, the level ratio between the OFDM signal and the SS signal is 25 dB. Further, it is assumed that the noise power is such that the OFDM carrier power to noise power is 10 dB. In this case, the signal transmitted by the OFDM transmission method cannot be decoded correctly, but the signal transmitted by the SS transmission method can be decoded. The G.S. transmission method, which has a high degree of importance,
O. P. When the header information of G. O. P. Since no error occurs in the header information of G. O. P. The header information of can be correctly decoded. G. O. P. If the header information of is correctly received, the possibility of returning to a normal state sooner when the interference is improved is increased.
【００１１】このレベル比の数値はある一例でありシス
テムにより変わる。例えば、ＳＳ伝送方法により伝送す
るデータの速度を遅くしたり、あるいはＳＳ伝送方法の
帯域幅を広げることにより、レベル比の上限は上がる。
また、ＯＦＤＭ伝送方法により伝送した情報を正しく復
調するのに必要なビット誤り率を高くすることにより下
限は下がる。The numerical value of this level ratio is an example and varies depending on the system. For example, the upper limit of the level ratio is increased by slowing the speed of data transmitted by the SS transmission method or widening the bandwidth of the SS transmission method.
In addition, the lower limit is lowered by increasing the bit error rate necessary to correctly demodulate the information transmitted by the OFDM transmission method.
【００１２】重要度の高い情報として、ここで例示した
ＭＰＥＧIIのＧ．Ｏ．Ｐ．ヘッダのみならず他の重要情
報、例えばＭＰＥＧIIのシーケンス・ヘッダ（Sequence
header ）、ピクチャー・ヘッダ（Picture header）が
利用できる。As the highly important information, the G. O. P. Not only the header but also other important information such as the sequence header (Sequence of MPEG II)
header), picture header (Picture header) can be used.
【００１３】送信情報をＭＵＳＩＣＡＭ（Masking Patt
ern Adaptive Universal Sub-bandIntegrated Coding a
nd Multiplexing) で符号化された音声情報とすれば、
重要情報としてサブバンドのスケールファクターや量子
化ビット数などの補助データも利用できる。The transmission information is transmitted to MUSICAM (Masking Patt
ern Adaptive Universal Sub-band Integrated Coding a
If it is voice information encoded by nd Multiplexing),
As important information, auxiliary data such as subband scale factor and number of quantization bits can also be used.
【００１４】送信情報をＩＳＤＢで送信される情報とす
れば、重要情報としてマルチプレックス構成情報も利用
できる。If the transmission information is information transmitted by ISDB, multiplex configuration information can also be used as important information.
【００１５】実施例３ 図４は、この本発明であるＯＦＤＭとＳＳの多重伝送を
利用した場合の実施例３の構成図である。伝送情報は静
止画情報と動画情報とする。静止画情報をＳＳ２，５を
用いて伝送し、動画情報をＯＦＤＭ３，７を用いて伝送
する。伝送上の妨害の程度によっては、ＳＳ伝送方法に
よる伝送においては誤りを生じないが、ＯＦＤＭ伝送方
法による伝送では誤りが生じる場合がある。このような
妨害程度の場合、最低限の情報として静止画情報を送る
ことが可能となる。ＳＳを用いて送る情報は、ここで例
示した静止画情報のみならず、低ビットレートの動画情
報も利用できる。また、伝送情報は、ここで例示した静
止画情報と動画情報のみならず、音声の副音声と主音声
も利用できる。 Third Embodiment FIG. 4 is a block diagram of a third embodiment when the multiplex transmission of OFDM and SS according to the present invention is used. The transmission information is still image information and moving image information. Still image information is transmitted using SS2 and 5, and moving image information is transmitted using OFDM3 and 7. Depending on the degree of interference in transmission, an error may not occur in transmission by the SS transmission method, but an error may occur in transmission by the OFDM transmission method. In the case of such interference, it is possible to send still image information as the minimum information. The information sent using SS is not limited to the still image information illustrated here, but low bit rate moving image information can be used. Further, as the transmission information, not only the still picture information and the moving picture information exemplified here but also the sub-audio and the main audio can be used.
【００１６】実施例４ 伝送情報は静止画情報と動画情報とする。ＯＦＤＭのシ
ンボルレートと同じビットレートを持つフレーム同期用
ＰＮ系列と静止画情報をＳＳを用いて伝送し、動画情報
をＯＦＤＭを用いて伝送する。ＳＳを用いて送る情報
は、ここで例示したフレーム同期用ＰＮ系列と静止画情
報の組み合わせのみならず、ＳＳで送ることができる情
報ならばどのような組み合わせも利用できる。 Embodiment 4 The transmission information is still picture information and moving picture information. A frame synchronization PN sequence having the same bit rate as the OFDM symbol rate and still image information are transmitted using SS, and moving image information is transmitted using OFDM. The information sent using SS is not limited to the combination of the frame synchronization PN sequence and the still picture information illustrated here, and any combination can be used as long as the information can be sent by SS.
【００１７】実施例５ 図５は、この本発明であるＯＦＤＭとＳＳの多重伝送
で、ＯＦＤＭディジタル信号を送信するチャンネル帯域
を含むより広い広帯域で、ＳＳ伝送方法により伝送され
た信号を多重した場合のスペクトルを示している。ＳＳ
伝送方法はＯＦＤＭディジタル信号伝送方法よりも広い
帯域が使用される。広い帯域が使用できれば、ＳＳ伝送
方法により伝送可能な情報量が増加する。 Embodiment 5 FIG. 5 is a multiplex transmission of OFDM and SS according to the present invention, in which a signal transmitted by the SS transmission method is multiplexed over a wider band including a channel band for transmitting an OFDM digital signal. Shows the spectrum of. SS
The transmission method uses a wider band than the OFDM digital signal transmission method. If a wide band can be used, the amount of information that can be transmitted by the SS transmission method increases.
【００１８】伝送情報は静止画情報と動画情報とする。
静止画情報をＯＦＤＭ伝送方法よりも広い帯域を使用し
ているＳＳ伝送方法を用いて伝送し、動画情報をＯＦＤ
Ｍ伝送方法を用いて伝送する。また伝送情報は、ここで
例示した静止画情報と動画情報のみならず、伝送できる
ディジタル情報であれば利用できる。The transmission information is static image information and moving image information.
Still image information is transmitted using the SS transmission method that uses a wider band than the OFDM transmission method, and the moving image information is OFD.
It is transmitted using the M transmission method. The transmission information is not limited to the still picture information and the moving picture information exemplified here, but can be any digital information that can be transmitted.
【００１９】以上いくつかの実施例をあげ本発明を説明
してきたが、本発明はこれら実施例に限定されることな
く、発明の要旨内で各種の変形、変更の可能なことは自
明であろう。また、本発明の場合請求項１に記載した
「ＯＦＤＭディジタル信号を送信するチャンネルを含む
広帯域」とは、前記広帯域の帯域が前記チャンネルの帯
域と等しいか、それ以上広い両方の場合を含むことを意
味するものと定義する。Although the present invention has been described above with reference to several embodiments, it is obvious that the present invention is not limited to these embodiments and various modifications and changes can be made within the scope of the invention. Let's do it. Further, in the case of the present invention, “a wide band including a channel for transmitting an OFDM digital signal” described in claim 1 includes both cases where the band of the wide band is equal to or wider than the band of the channel. Defined as meaning.
【００２０】[0020]
【発明の効果】本発明によれば、ＯＦＤＭ伝送方法によ
る伝送では誤りを生じるが、ＳＳ伝送方法による伝送で
は誤りを生じないような伝送路上の妨害程度の場合、致
命的な誤りを回避できる。致命的な誤りを回避できれ
ば、同期等の重要情報は誤っていないので、妨害が弱く
なった場合の正常状態への復帰が早くなる。According to the present invention, a fatal error can be avoided in the case of a degree of interference on the transmission path where an error occurs in the transmission by the OFDM transmission method but does not occur in the transmission by the SS transmission method. If a fatal error can be avoided, important information such as synchronization will not be incorrect, and the recovery to the normal state will be quicker when the interference is weakened.
【図１】本発明で伝送した場合のスペクトルの一例を示
す図である。FIG. 1 is a diagram showing an example of a spectrum when transmitted according to the present invention.
【図２】本発明の実施例１を示す構成ブロック線図であ
る。FIG. 2 is a configuration block diagram showing a first embodiment of the present invention.
【図３】本発明の実施例２を示す構成ブロック線図であ
る。FIG. 3 is a configuration block diagram showing a second embodiment of the present invention.
【図４】本発明の実施例３を示す構成ブロック線図であ
る。FIG. 4 is a configuration block diagram showing a third embodiment of the present invention.
【図５】本発明でＳＳの帯域が広い場合のスペクトルの
一例を示す図である。FIG. 5 is a diagram showing an example of a spectrum when the SS band is wide according to the present invention.
１ フレーム同期発生器 ２ ＳＳ変調器 ３ ＯＦＤＭ変調器 ４ 加算器（多重） ５ ＳＳ復調器 ６ フレーム同期再生器 ７ ＯＦＤＭ復調器 ８ 情報分別器 ９ 情報合成器 1 frame synchronization generator 2 SS modulator 3 OFDM modulator 4 adder (multiplex) 5 SS demodulator 6 frame synchronization regenerator 7 OFDM demodulator 8 information separator 9 information combiner
───────────────────────────────────────────────────── フロントページの続き (72)発明者 中原 俊二 東京都世田谷区砧１丁目10番11号 日本放 送協会放送技術研究所内 (72)発明者 佐々木 誠 東京都世田谷区砧１丁目10番11号 日本放 送協会放送技術研究所内 (72)発明者 山田 宰 東京都世田谷区砧１丁目10番11号 日本放 送協会放送技術研究所内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Shunji Nakahara Inventor Shunji 1-10-11 Kinuta, Setagaya-ku, Tokyo Inside the Japan Broadcasting Corporation Broadcasting Technology Laboratory (72) Inventor Makoto Sasaki 1-1-10 Kinuta, Setagaya-ku, Tokyo No. 72 Broadcasting Technology Research Institute of Japan Broadcasting Corporation (72) Inventor Satoshi Yamada 1-10-11 Kinuta, Setagaya-ku, Tokyo Inside Broadcasting Technology Research Institute of Japan Broadcasting Corporation
Claims (5)
ＦＤＭディジタル信号を送信するチャンネルを含む広帯
域に、ＳＳ伝送方法により伝送された信号を多重するこ
とを特徴とするディジタル信号伝送方法。1. When transmitting a digital signal, O
A digital signal transmission method, characterized in that a signal transmitted by an SS transmission method is multiplexed in a wide band including a channel for transmitting an FDM digital signal.
フレーム同期情報を、多重される前記ＳＳ伝送方法によ
って送信することを特徴とする請求項１記載のディジタ
ル信号伝送方法。2. The digital signal transmission method according to claim 1, wherein frame synchronization information of the OFDM digital signal transmission method is transmitted by the SS transmission method to be multiplexed.
を重要度の高い情報とその他の情報に分別し、重要度の
高い情報はＯＦＤＭディジタル信号に多重される前記Ｓ
Ｓ伝送方法によって送信し、他の情報は前記ＯＦＤＭデ
ィジタル信号伝送方法により送信することを特徴とする
請求項１記載のディジタル信号伝送方法。3. The information of a digital signal to be transmitted is classified into highly important information and other information, and the highly important information is multiplexed into an OFDM digital signal.
2. The digital signal transmission method according to claim 1, wherein the S signal is transmitted by the S transmission method and the other information is transmitted by the OFDM digital signal transmission method.
Ｍディジタル信号に多重される前記ＳＳ伝送方法によっ
て送信し、動画情報は前記ＯＦＤＭディジタル信号伝送
方法により送信することを特徴とする請求項１記載のデ
ィジタル信号伝送方法。4. Still image information in a digital signal is OFD.
2. The digital signal transmission method according to claim 1, wherein the M digital signal is transmitted by the SS transmission method and the moving picture information is transmitted by the OFDM digital signal transmission method.
ーム同期情報、重要度の高い情報、静止画情報を組み合
わせてＯＦＤＭディジタル信号に多重される前記ＳＳ伝
送方法によって送信し、他の情報は前記ＯＦＤＭディジ
タル信号伝送方法により送信することを特徴とする請求
項１記載のディジタル信号伝送方法。5. The frame transmission information of the OFDM digital signal transmission method, information of high importance, and still image information are combined and transmitted by the SS transmission method, and other information is transmitted by the SS transmission method. The digital signal transmission method according to claim 1, wherein the transmission is performed by a transmission method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6036014A JPH07245574A (en) | 1994-03-07 | 1994-03-07 | Digital signal transmission method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6036014A JPH07245574A (en) | 1994-03-07 | 1994-03-07 | Digital signal transmission method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07245574A true JPH07245574A (en) | 1995-09-19 |
Family
ID=12457903
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6036014A Pending JPH07245574A (en) | 1994-03-07 | 1994-03-07 | Digital signal transmission method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07245574A (en) |
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