JPH05260413A - Data transmission circuit - Google Patents

Data transmission circuit

Info

Publication number
JPH05260413A
JPH05260413A JP4086224A JP8622492A JPH05260413A JP H05260413 A JPH05260413 A JP H05260413A JP 4086224 A JP4086224 A JP 4086224A JP 8622492 A JP8622492 A JP 8622492A JP H05260413 A JPH05260413 A JP H05260413A
Authority
JP
Japan
Prior art keywords
signal
circuit
converter
qpsk
multipliers
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.)
Granted
Application number
JP4086224A
Other languages
Japanese (ja)
Other versions
JP2893496B2 (en
Inventor
Kazuo Okada
一夫 岡田
Yoshihiko Kamo
良彦 加茂
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Fujitsu General Ltd
Original Assignee
Fujitsu Ltd
Fujitsu General Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fujitsu Ltd, Fujitsu General Ltd filed Critical Fujitsu Ltd
Priority to JP4086224A priority Critical patent/JP2893496B2/en
Publication of JPH05260413A publication Critical patent/JPH05260413A/en
Application granted granted Critical
Publication of JP2893496B2 publication Critical patent/JP2893496B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Television Receiver Circuits (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

PURPOSE:To obtain a simple circuit able to implement digital processing completely. CONSTITUTION:A carrier of an inputted QPSK signal and a recovered carrier are controlled so that their phase difference is made zero. An A/D converter 41 is interposed between a QPSK input terminal 26 and multipliers 37, 38, digital devices are employed for the multipliers 37, 38 and LPFs 39, 40, a D/A converter 42 is interposed between a signal processing circuit 33 and a VCO 45, a frequency divider circuit 46 is coupled with an output of the VCO 45 comprising a rectangular wave oscillator, and a 1st ROM 47 and a 2nd ROM 48 are interposed between the two multipliers 37, 38 and the frequency divider circuit 46 respectively. The inputted QPSK signal is converted into a digital signal immediately by the A/D converter 41 and multiplied with the signal generated from the 1st, 2nd ROMs 47, 48 at the multipliers 37, 38, the resulting signal is given to the LPFs 39, 40 and the signal processing circuit 33, in which data are recovered, the data are outputted from a data output terminal 43, a clock is outputted from a clock output terminal 44 and a phase difference signal is outputted to the D/A converter 42 respectively.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、衛星放送受信機におけ
る音声信号を復調するための4位相復調回路などのサン
プリング型データ伝送回路に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sampling type data transmission circuit such as a 4-phase demodulation circuit for demodulating an audio signal in a satellite broadcast receiver.

【0002】[0002]

【従来の技術】一般に、衛星放送受信機は第3図に示す
ように、放送衛星11からの電波をパラボラアンテナ1
2で受信し、BSコンバータ13で1GHzの中間周波
数帯に変換し、BSチューナ14に送られる。このBS
チューナ14では選局回路15により希望するチャンネ
ルを選択し、FM復調回路16でFM復調をした後、映
像−音声分離回路17で映像信号と音声信号に分離す
る。このうち、映像信号はデエンファシス回路18、エ
ネルギー拡散信号除去回路19によってもとの映像信号
を再生し、テレビ受像機20の映像入力端子21に加え
る。他方、音声信号は4位相復調(以下QPSKという)
回路22、PCM復調回路23によって復調し、デエン
ファシス回路24によってもとの音声信号に再生する。
そして前記テレビ受像機20の音声入力端子25に加え
る。このようにして衛星放送の受信を可能とする。
2. Description of the Related Art In general, a satellite broadcasting receiver transmits radio waves from a broadcasting satellite 11 to a parabolic antenna 1 as shown in FIG.
It is received at 2, converted into an intermediate frequency band of 1 GHz by the BS converter 13, and sent to the BS tuner 14. This BS
In the tuner 14, a channel selection circuit 15 selects a desired channel, an FM demodulation circuit 16 performs FM demodulation, and a video-audio separation circuit 17 separates a video signal and an audio signal. Of these, the video signal is reproduced by the de-emphasis circuit 18 and the energy diffusion signal removal circuit 19 and is applied to the video input terminal 21 of the television receiver 20. On the other hand, the voice signal is 4-phase demodulated (hereinafter called QPSK)
The circuit 22 and the PCM demodulation circuit 23 demodulate, and the de-emphasis circuit 24 reproduces the original audio signal.
Then, it is added to the audio input terminal 25 of the television receiver 20. In this way, satellite broadcasting can be received.

【0003】以上のような衛星放送受信機において、従
来のQPSK回路22は、第2図のように構成されてい
た。この従来のQPSK回路22において、QPSK信
号は、乗算器27、28、アナログ型LPF29、3
0、A/D変換器31、32を通り、位相差検出のため
のディジタル信号処理回路33に送られる。このディジ
タル信号処理回路33では、QPSK信号の発生側の搬
送波の位相と、VCO34から発生する再生搬送波の位
相差を比較し、その差が0となるようにD/A変換器3
6を介してVCO34に制御信号を加える。このVCO
34からの発振信号は、一方の乗算器27に−90°移
相器35を介して送られ。また他方の乗算器28にその
まま送られて入力したQPSK信号と乗算される。そし
て位相差が次第に0になって、復調信号としてA/D変
換器31、32を経てディジタル信号処理回路33から
出力する。
In the satellite broadcast receiver as described above, the conventional QPSK circuit 22 is constructed as shown in FIG. In this conventional QPSK circuit 22, the QPSK signal is multiplied by the multipliers 27 and 28 and the analog LPFs 29 and 3.
0, A / D converters 31 and 32, and sent to a digital signal processing circuit 33 for phase difference detection. In this digital signal processing circuit 33, the phase of the carrier wave on the generation side of the QPSK signal is compared with the phase difference of the reproduced carrier wave generated from the VCO 34, and the D / A converter 3 is set so that the difference becomes zero.
A control signal is applied to the VCO 34 via 6. This VCO
The oscillation signal from 34 is sent to one of the multipliers 27 via a −90 ° phase shifter 35. Further, it is sent to the other multiplier 28 as it is and multiplied by the input QPSK signal. The phase difference gradually becomes 0, and the demodulated signal is output from the digital signal processing circuit 33 via the A / D converters 31 and 32.

【0004】以上のQPSK回路22には、QPSK信
号の位相成分を検出するため、乗算器27、28とLP
F29、30が従属して接続されている。ここで、QP
SK信号をcos(ωct+φ)と表わし、再生搬送波を
cos ωctと表わすと、乗算器27による乗算結果
は1/2・{cos(2ωct+φ)+cosφ}となり、
後続のLPF29により、cosφ成分だけが取り出さ
れ、同様に、LPF30により、sinφ成分が得られ
る。
The above QPSK circuit 22 detects the phase component of the QPSK signal, and therefore, the multipliers 27 and 28 and the LP
F29 and 30 are subordinately connected. Where QP
When the SK signal is represented by cos (ωct + φ) and the reproduced carrier is represented by cos ωct, the multiplication result by the multiplier 27 is 1/2 · {cos (2ωct + φ) + cosφ},
Only the cos φ component is extracted by the subsequent LPF 29, and similarly, the sin φ component is obtained by the LPF 30.

【0005】[0005]

【発明が解決しようとする課題】しかるに、従来のQP
SK回路22は、2個のA/D変換器31、32を必要
とするために、回路構成が複雑になる。また、−90°
移相器35はアナログ信号で処理していたので、90°
の位相差が温度変化などで変動することがあり、この変
動のため、受信信号からデータを再生するとき、誤りが
増加する原因となるなどの問題があった。
However, the conventional QP
Since the SK circuit 22 requires two A / D converters 31 and 32, the circuit configuration becomes complicated. Also, -90 °
Since the phase shifter 35 processed with an analog signal, 90 °
The phase difference of 1 may fluctuate due to temperature changes and the like, which causes a problem of increasing errors when reproducing data from a received signal.

【0006】本発明は、簡単な回路で、しかも、完全に
ディジタル処理のできる回路を得ることを目的とする。
An object of the present invention is to obtain a circuit which can be completely digitally processed with a simple circuit.

【0007】[0007]

【課題を解決するための手段】本発明は、QPSK入力
端子に入力したQPSK信号を2つに分岐し、それぞれ
乗算器、LPFを介して信号処理回路に結合し、この信
号処理回路から復調出力と位相差出力とを得て、この位
相差出力をVCOを介して前記一方の乗算器には移相し
た信号を送り、他方の乗算器にはそのまま送ることによ
り入力した搬送波と再生搬送波の位相差が0となるよう
に制御するようにしたものにおいて、前記QPSK入力
端子と乗算器との間にA/D変換器を介在し、前記乗算
器およびLPFはディジタル形を用い、前記信号処理回
路とVCOとの間にD/A変換器を介在し、前記VCO
は、矩形波発振器からなり、このVCOの出力側に分周
回路を結合し、この分周回路と前記2つの乗算器との間
にそれぞれ第1ROMと第2ROMとを介在してなるこ
とを特徴とするデータ伝送回路である。
According to the present invention, a QPSK signal input to a QPSK input terminal is branched into two and coupled to a signal processing circuit through a multiplier and an LPF, respectively, and a demodulation output from this signal processing circuit is provided. And a phase difference output are obtained, and the phase difference output is sent to the one multiplier through the VCO as a phase-shifted signal and is sent to the other multiplier as it is. In the control so that the phase difference becomes 0, an A / D converter is interposed between the QPSK input terminal and the multiplier, the multiplier and the LPF are digital type, and the signal processing circuit is used. And a VCO, a D / A converter is interposed between the VCO and
Is a rectangular wave oscillator, a frequency divider circuit is coupled to the output side of the VCO, and a first ROM and a second ROM are interposed between the frequency divider circuit and the two multipliers, respectively. Is a data transmission circuit.

【0008】[0008]

【作用】入力したQPSK信号はA/D変換器41です
ぐにディジタル値に変換し、乗算器37、38で第1の
ROM47と第2のROM48で発生した信号と乗算さ
れる。乗算されたデータは、LPF39、40と、信号
処理回路33によってデータが再生される。
The input QPSK signal is immediately converted into a digital value by the A / D converter 41, and is multiplied by the signals generated by the first ROM 47 and the second ROM 48 by the multipliers 37 and 38. The multiplied data is reproduced by the LPFs 39 and 40 and the signal processing circuit 33.

【0009】ここで、サンプリング間隔を再生搬送波と
同期したN分周で行うものとする。例えば、N=4でサ
ンプリングすると、第1のROM47では、+1,+
1,−1,−1,…となり、第2のROM48では、−
1,+1,+1,−1,…となり、+1か−1となる。
したがって、乗算器37、38では、ディジタルのQP
SK信号に+1または−1を乗算して次段の回路へ送ら
れる。
Here, it is assumed that the sampling interval is divided by N in synchronization with the reproduced carrier wave. For example, when sampling is performed with N = 4, the first ROM 47 has +1, +
1, -1, -1, ..., In the second ROM 48,
1, +1, +1, -1, ..., And becomes +1 or -1.
Therefore, in the multipliers 37 and 38, the digital QP
The SK signal is multiplied by +1 or -1 and sent to the circuit at the next stage.

【0010】[0010]

【実施例】以下、本発明の一実施例を第1図に基き説明
する。第1図において、26はQPSK信号入力端子
で、このQPSK信号入力端子26に直接A/D変換器
41をを結合する。この直接A/D変換器41の出力側
は、2つに分岐され、それぞれディジタル型の乗算器3
7、38に結合され、さらにディジタル型のLPF3
9、40に結合されている。これらのディジタル型のL
PF39、40は、位相差検出のためのディジタル信号
処理回路33に結合され、このディジタル信号処理回路
33の出力側には、データ出力端子43、クロック出力
端子44およびD/A変換器42が結合されている。
An embodiment of the present invention will be described below with reference to FIG. In FIG. 1, reference numeral 26 is a QPSK signal input terminal, and the A / D converter 41 is directly connected to the QPSK signal input terminal 26. The output side of the direct A / D converter 41 is branched into two, each of which is a digital type multiplier 3
LPF3 of digital type coupled to 7 and 38
It is connected to 9, 40. These digital type L
The PFs 39 and 40 are coupled to a digital signal processing circuit 33 for detecting a phase difference, and a data output terminal 43, a clock output terminal 44 and a D / A converter 42 are coupled to the output side of the digital signal processing circuit 33. Has been done.

【0011】このD/A変換器42には、N×f0Hz
の矩形波を発振するVCO45が結合され、このVCO
45の出力側にカウンタからなりN分周する分周器46
が結合され、この分周器46の出力側を2つに分岐して
それぞれ第1のROM47と第2のROM48を介して
前記乗算器37、38に結合されている。
The D / A converter 42 has N × f 0 Hz.
The VCO 45 that oscillates the rectangular wave of
A divider 46 consisting of a counter on the output side of 45 and dividing by N
Are connected to each other, and the output side of the frequency divider 46 is branched into two and connected to the multipliers 37 and 38 via a first ROM 47 and a second ROM 48, respectively.

【0012】以上のような構成において、QPSK信号
入力端子26に入力したQPSK信号は、A/D変換器
41ですぐにディジタル値に変換して乗算器37、38
へ送られる。この乗算器37、38では、第1のROM
47と第2のROM48で発生した信号と乗算される。
この乗算されたデータは、前記ディジタル型のLPF3
9、40と、位相差検出のためのディジタル信号処理回
路33によってデータが再生され、データ出力端子43
にデータが出力し、クロック出力端子44にクロックが
出力し、D/A変換器42に位相差信号が出力する。
In the above configuration, the QPSK signal input to the QPSK signal input terminal 26 is immediately converted into a digital value by the A / D converter 41, and the multipliers 37, 38 are provided.
Sent to. In the multipliers 37 and 38, the first ROM
47 and the signal generated in the second ROM 48 are multiplied.
This multiplied data is the digital type LPF3.
The data is reproduced by the digital signal processing circuit 33 for detecting the phase difference and the data output terminal 43.
Data, a clock is output to the clock output terminal 44, and a phase difference signal is output to the D / A converter 42.

【0013】ここで、再生搬送波とQPSK信号とをデ
ィジタル的に乗算するためには、乗算を一定時間間隔で
区切って行う必要があり、また、その間隔はサンプリン
グ定理を満足する程度に短くなければならない。そこ
で、この間隔を図4における再生搬送波と同期したN分
周で行うものとする。例えば第4図において、N=4で
サンプリングすると、第1のROM47では、+1,+
1,−1,−1,…となり、第2のROM48では、9
0°の位相差を有することから、−1,+1,+1,−
1,…となり、+1か−1となる。したがって、乗算器
37、38では、ディジタルのQPSK信号に+1また
は−1を乗算して次段の回路へ送られる。
Here, in order to multiply the reproduced carrier wave and the QPSK signal digitally, it is necessary to divide the multiplication at constant time intervals, and the intervals must be short enough to satisfy the sampling theorem. I won't. Therefore, it is assumed that this interval is divided by N in synchronization with the reproduced carrier wave in FIG. For example, in FIG. 4, when N = 4 is sampled, the first ROM 47 reads +1, +
1, -1, -1, ..., In the second ROM 48, 9
Since the phase difference is 0 °, -1, +1, +1,-
1, ..., +1 or -1. Therefore, in the multipliers 37 and 38, the digital QPSK signal is multiplied by +1 or -1 and sent to the circuit of the next stage.

【0014】[0014]

【発明の効果】本発明は上述のように構成したので、回
路構成が簡単になる。また、−90°移相はディジタル
信号で処理するようにしたので、90°の位相差が温度
変化などで変動することがなく、受信信号からデータを
再生するとき、誤りが発生せず、信頼性の高い回路とな
る。
Since the present invention is configured as described above, the circuit configuration becomes simple. Further, since the -90 ° phase shift is processed by the digital signal, the 90 ° phase difference does not change due to temperature change and the like, and when data is reproduced from the received signal, no error occurs and reliability is improved. It becomes a highly efficient circuit.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明によるデータ伝送回路の一実施例を示す
ブロック図である。
FIG. 1 is a block diagram showing an embodiment of a data transmission circuit according to the present invention.

【図2】従来のデータ伝送回路のブロック図である。FIG. 2 is a block diagram of a conventional data transmission circuit.

【図3】一般的な衛星放送受信機のブロック図である。FIG. 3 is a block diagram of a general satellite broadcast receiver.

【図4】波形図である。FIG. 4 is a waveform diagram.

【符号の説明】[Explanation of symbols]

11…放送衛星、12…パラボラアンテナ、13…BS
コンバータ、14…BSチューナ、15…選局回路、1
6…FM復調回路、17…映像−音声分離回路、18…
デエンファシス回路、19…エネルギー拡散信号除去回
路、20…テレビ受像機、21…映像入力端子、22…
QPSK(4位相復調)回路、23…PCM復調回路、
24…デエンファシス回路、25…音声入力端子、26
…QPSK入力端子、27、28…アナログ乗算器、2
9、30…アナログLPF、31、32…A/D変換
器、33…信号処理回路、34…矩形波VCO、35…
−90°移相器、36…D/A変換器、37、38…デ
ィジタル乗算器、39、40…ディジタルLPF、41
…A/D変換器、42…D/A変換器、43…データ出
力端子、44…クロック出力端子、45…矩形波VC
O、46…分周回路、47…第1のROM、48…第2
のROM。
11 ... Broadcast satellite, 12 ... Parabolic antenna, 13 ... BS
Converter, 14 ... BS tuner, 15 ... Channel selection circuit, 1
6 ... FM demodulation circuit, 17 ... Video-audio separation circuit, 18 ...
De-emphasis circuit, 19 ... Energy diffusion signal removing circuit, 20 ... Television receiver, 21 ... Image input terminal, 22 ...
QPSK (4 phase demodulation) circuit, 23 ... PCM demodulation circuit,
24 ... De-emphasis circuit, 25 ... Audio input terminal, 26
… QPSK input terminals, 27, 28… Analog multiplier, 2
9, 30 ... Analog LPF, 31, 32 ... A / D converter, 33 ... Signal processing circuit, 34 ... Rectangular wave VCO, 35 ...
-90 ° phase shifter, 36 ... D / A converter, 37, 38 ... Digital multiplier, 39, 40 ... Digital LPF, 41
... A / D converter, 42 ... D / A converter, 43 ... Data output terminal, 44 ... Clock output terminal, 45 ... Rectangular wave VC
O, 46 ... Frequency divider circuit, 47 ... First ROM, 48 ... Second
ROM of.

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 QPSK入力端子に入力したQPSK信
号を2つに分岐し、それぞれ乗算器、LPFを介して信
号処理回路に結合し、この信号処理回路から復調出力と
位相差出力とを得て、この位相差出力をVCOを介して
前記一方の乗算器には移相した信号を送り、他方の乗算
器にはそのまま送ることにより入力した搬送波と再生搬
送波の位相差が0となるように制御するようにしたもの
において、前記QPSK入力端子と乗算器との間にA/
D変換器を介在し、前記乗算器およびLPFはディジタ
ル形を用い、前記信号処理回路とVCOとの間にD/A
変換器を介在し、前記VCOは、矩形波発振器からな
り、このVCOの出力側に分周回路を結合し、この分周
回路と前記2つの乗算器との間にそれぞれ第1ROMと
第2ROMとを介在してなることを特徴とするデータ伝
送回路。
1. A QPSK signal input to a QPSK input terminal is branched into two and coupled to a signal processing circuit via a multiplier and an LPF, respectively, and a demodulation output and a phase difference output are obtained from this signal processing circuit. , A phase-shifted signal is sent to the one multiplier through the VCO and sent to the other multiplier as it is, so that the phase difference between the input carrier and the reproduced carrier is controlled to be zero. In the configuration described above, A / B is provided between the QPSK input terminal and the multiplier.
A digital converter is used as the multiplier and the LPF with a D converter interposed, and a D / A is provided between the signal processing circuit and the VCO.
The converter is interposed, the VCO is composed of a rectangular wave oscillator, a frequency divider circuit is coupled to the output side of the VCO, and a first ROM and a second ROM are provided between the frequency divider circuit and the two multipliers, respectively. A data transmission circuit, characterized in that
JP4086224A 1992-03-10 1992-03-10 Data transmission circuit Expired - Lifetime JP2893496B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4086224A JP2893496B2 (en) 1992-03-10 1992-03-10 Data transmission circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4086224A JP2893496B2 (en) 1992-03-10 1992-03-10 Data transmission circuit

Publications (2)

Publication Number Publication Date
JPH05260413A true JPH05260413A (en) 1993-10-08
JP2893496B2 JP2893496B2 (en) 1999-05-24

Family

ID=13880822

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4086224A Expired - Lifetime JP2893496B2 (en) 1992-03-10 1992-03-10 Data transmission circuit

Country Status (1)

Country Link
JP (1) JP2893496B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6345018B1 (en) 1999-08-04 2002-02-05 Ricoh Company, Ltd. Demodulation circuit for demodulating wobbling signal
US7142382B2 (en) 2003-09-22 2006-11-28 Matsushita Electric Industrial Co., Ltd. Phase adjustment circuit and demodulation circuit
US7321639B2 (en) 2003-03-07 2008-01-22 Matsushita Electric Industrial Co., Ltd. Demodulator and address information extractor

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6345018B1 (en) 1999-08-04 2002-02-05 Ricoh Company, Ltd. Demodulation circuit for demodulating wobbling signal
USRE39513E1 (en) 1999-08-04 2007-03-13 Ricoh Company, Ltd. Demodulation circuit for demodulating wobbling signal
US7321639B2 (en) 2003-03-07 2008-01-22 Matsushita Electric Industrial Co., Ltd. Demodulator and address information extractor
US7142382B2 (en) 2003-09-22 2006-11-28 Matsushita Electric Industrial Co., Ltd. Phase adjustment circuit and demodulation circuit

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