JPH05236038A - Psk modulator - Google Patents

Psk modulator

Info

Publication number
JPH05236038A
JPH05236038A JP3740592A JP3740592A JPH05236038A JP H05236038 A JPH05236038 A JP H05236038A JP 3740592 A JP3740592 A JP 3740592A JP 3740592 A JP3740592 A JP 3740592A JP H05236038 A JPH05236038 A JP H05236038A
Authority
JP
Japan
Prior art keywords
signal
carrier
error
memory
output
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
JP3740592A
Other languages
Japanese (ja)
Other versions
JP3229991B2 (en
Inventor
Takahisa Araiya
孝久 新井谷
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.)
NEC Engineering Ltd
Original Assignee
NEC Engineering 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 NEC Engineering Ltd filed Critical NEC Engineering Ltd
Priority to JP03740592A priority Critical patent/JP3229991B2/en
Publication of JPH05236038A publication Critical patent/JPH05236038A/en
Application granted granted Critical
Publication of JP3229991B2 publication Critical patent/JP3229991B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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

Abstract

PURPOSE:To prevent an output of a distorted wave due to an error in a data signal from the PSK modulator in advance. CONSTITUTION:A parity signal is added in addition to usual output data of a digital filter as output data of a memory 7 in the PSK modulator having the digital filter employing the memory 7. The modulator is provided with an error discriminator 4 receiving the memory output data, detecting an error, and outputting a carrier-off signal when discriminating to be an error, and with a carrier ON/OFF controller receiving the carrier-OFF signal to set the carrier off.

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PSK変調装置に関し、
特に誤りを有するデータで変調されたキャリアの出力を
防止できるPSK変調装置に関する。
FIELD OF THE INVENTION The present invention relates to a PSK modulator,
In particular, the present invention relates to a PSK modulator that can prevent the output of a carrier modulated with erroneous data.

【0002】[0002]

【従来の技術】従来のディジタルフィルタを用いた4相
PSK変調装置を図3に示し、このディジタルフィルタ
24を図4に示す。まず、図3において、Pチャンネル
入力信号1A,およびQチャンネル入力信号1Bとクロ
ック信号2とはPチャンネル用ディジタルフィルタ24
A、およびQチャンネル用ディジタルフィルタ24Bに
供給され、その出力が、乗算器20Aおよび20Bに入
力される。乗算器20A,20Bに達した信号はキャリ
ア発振器16から得られるキャリア周波数信号17と、
90°移相器18により90°移相偏移されたキャリア
周波数19とそれぞれ掛け合わされ、この2つの信号を
加算器21で加算することにより4相PSK信号23が
得られる。次にディジタルフィルタ24A,24B内は
同じ構成で図4に示すように、入力信号1および補助入
力信号6が、シリアル/パラレル変換器3にてパラレル
信号5に変換され、メモリ7にアドレス信号として入力
してアクセスし、メモリ7内部にあらかじめ設定してお
いたデータ8が出力される。メモリ7より出力されたデ
ータ8は、D/A変換器10によりアナログ信号11に
変換され、ローパスフィルタ(LPF)12により高調
波成分を遮断し、ディジタルフィルタの出力信号13と
して出力される。
2. Description of the Related Art A conventional four-phase PSK modulator using a digital filter is shown in FIG. 3, and this digital filter 24 is shown in FIG. First, in FIG. 3, the P channel input signal 1A, the Q channel input signal 1B and the clock signal 2 are the P channel digital filter 24.
It is supplied to the A and Q channel digital filters 24B, and the outputs thereof are input to the multipliers 20A and 20B. The signals reaching the multipliers 20A and 20B are the carrier frequency signal 17 obtained from the carrier oscillator 16,
The 90 ° phase shifter 18 multiplies the carrier frequency 19 shifted by 90 °, and the two signals are added by an adder 21 to obtain a 4-phase PSK signal 23. Next, in the digital filters 24A and 24B, the input signal 1 and the auxiliary input signal 6 are converted into the parallel signal 5 by the serial / parallel converter 3 as shown in FIG. Data is input and accessed, and the data 8 preset in the memory 7 is output. The data 8 output from the memory 7 is converted into an analog signal 11 by a D / A converter 10, a harmonic component is blocked by a low pass filter (LPF) 12, and the signal 8 is output as an output signal 13 of a digital filter.

【0003】[0003]

【発明が解決しようとする課題】上述した従来のディジ
タルフィルタは、送り側の出力信号の誤り判定能力がな
いので、データ誤りが生じた際に、誤ったデータの出力
がそのまま送信されることになるので、復調された出力
波形が歪むという欠点がある。
Since the conventional digital filter described above does not have the error judgment capability of the output signal on the sending side, when a data error occurs, the output of erroneous data is transmitted as it is. Therefore, there is a drawback that the demodulated output waveform is distorted.

【0004】[0004]

【課題を解決するための手段】本発明のディジタルフィ
ルタは、メモリを用いたディジタルフィルタを有するP
SK変調装置において、そのメモリの出力データとして
通常のディジタルフィルタの出力データの他にパリティ
信号を追加し、これらのメモリ出力データを入力して誤
りを検出して誤りと判定した場合にキャリアオフ信号を
出力する誤り判定器と、このキャリアオフ信号を入力し
てキャリアをオフするキャリアオンオフ制御器とを備え
ている。
A digital filter according to the present invention is a P having a digital filter using a memory.
In the SK modulator, a parity signal is added to the output data of the memory in addition to the output data of the normal digital filter, and when these memory output data are input and an error is detected and determined to be an error, a carrier off signal is output. Is provided, and a carrier on / off controller that inputs the carrier off signal to turn off the carrier.

【0005】[0005]

【実施例】次に、本発明について図面を参照して説明す
る。図1は、本発明の一実施例のディジタルフィルタを
用いた4相PSK装置構成図、図2は、図1の実施例の
ディジタルフィルタを示す構成図である。図1の実施例
は本実施例のディジタルフィルタ25A,25Bから出
力される。キャリアオフ信号15A,15Bを受けてキ
ャリア信号をオフするゲート22を備えている。次に本
実施例のディジタルフィルタ25A,25Bを図2によ
り説明する。図2において、キャリアオフ信号15を発
生させるために、メモリ7の出力データのパリティ信号
9と、この信号を用いた誤り判定器14を追加する。パ
リティ信号9のデータはあらかじめメモリ7に格納され
ている。メモリ7からの出力データ8は、ディジタルフ
ィルタ出力信号13を作るためにD/A変換器10に渡
される信号と、データ誤りを判定しキャリアオフ信号1
5を作るために、データの誤り判定器14に渡される信
号の2つに分かれる。D/A変換器10に渡された信号
はアナログ信号11に変換され、ローパスフィルタ12
を経て、ディジタルフィルタ出力信号13となる。ま
た、誤り判定器14に渡された信号は、パリティ信号9
を含むすべてのビットでパリティチェックを受け、その
結果誤りがあればキャリアオフ信号15が発生される。
このキャリアオフ信号15は、出力制御用のゲート22
に入力され、キャリア出力のオンオフ制御を行う。
DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of a 4-phase PSK device using a digital filter of an embodiment of the present invention, and FIG. 2 is a block diagram showing a digital filter of the embodiment of FIG. The embodiment of FIG. 1 is output from the digital filters 25A and 25B of this embodiment. A gate 22 for turning off the carrier signal upon receiving the carrier-off signals 15A and 15B is provided. Next, the digital filters 25A and 25B of this embodiment will be described with reference to FIG. In FIG. 2, in order to generate the carrier-off signal 15, a parity signal 9 of the output data of the memory 7 and an error determiner 14 using this signal are added. The data of the parity signal 9 is stored in the memory 7 in advance. The output data 8 from the memory 7 is the signal passed to the D / A converter 10 to produce the digital filter output signal 13 and the carrier off signal 1 for determining a data error.
In order to make 5, the signal passed to the data error determiner 14 is split into two. The signal passed to the D / A converter 10 is converted into an analog signal 11, and the low pass filter 12
And becomes the digital filter output signal 13. The signal passed to the error determiner 14 is the parity signal 9
Parity check is performed on all the bits including, and if there is an error as a result, the carrier-off signal 15 is generated.
The carrier off signal 15 is output to the gate 22 for output control.
Is input to control ON / OFF of carrier output.

【0006】[0006]

【発明の効果】以上説明したように本発明は、ディジタ
ルフィルタにおけるメモリ出力データのパリティチェッ
クを行い、誤りと判定された場合には、キャリアオフ信
号を送ることにより、メモリデータの誤りによる歪み波
形の出力を未然に防ぐという効果がある。
As described above, according to the present invention, the parity check of the memory output data in the digital filter is performed, and when it is determined that there is an error, a carrier-off signal is sent to distort the waveform due to the error of the memory data. The effect is to prevent the output of.

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

【図1】本発明の一実施例の構成図である。FIG. 1 is a configuration diagram of an embodiment of the present invention.

【図2】本実施例のディジタルフィルタの構成図であ
る。
FIG. 2 is a configuration diagram of a digital filter of the present embodiment.

【図3】従来のPSK変調装置の構成図である。FIG. 3 is a block diagram of a conventional PSK modulator.

【図4】従来のディジタルフィルタの構成図である。FIG. 4 is a block diagram of a conventional digital filter.

【符号の説明】[Explanation of symbols]

3 シリアルパラレル変換器 4 誤り判定器 7 メモリ 10 D/A変換器 12 ローパスフィルタ 16 キャリア発振器 18 90°移相器 20A,20B 乗算器 21 加算器 22 ゲート 24A,B、25A,B ディジタルフィルタ 3 serial / parallel converter 4 error determiner 7 memory 10 D / A converter 12 low-pass filter 16 carrier oscillator 18 90 ° phase shifter 20A, 20B multiplier 21 adder 22 gate 24A, B, 25A, B digital filter

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 メモリを用いたディジタルフィルタを有
するPSK変調装置において、そのメモリの出力データ
として通常のディジタルフィルタの出力データの他にパ
リティ信号を追加し、これらのメモリ出力データを入力
して誤りを検出して誤りと判定した場合にキャリアオフ
信号を出力する誤り判定器と、このキャリアオフ信号を
入力してキャリアをオフするキャリアオンオフ制御器と
を備えていることを特徴とするPSK変調装置。
1. In a PSK modulator having a digital filter using a memory, a parity signal is added to the output data of the memory in addition to the output data of a normal digital filter, and these memory output data are input to cause an error. And a carrier on / off controller for turning off the carrier by inputting the carrier off signal, and a carrier on / off controller for outputting the carrier off signal when the error is detected. .
JP03740592A 1992-02-25 1992-02-25 PSK modulator Expired - Fee Related JP3229991B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP03740592A JP3229991B2 (en) 1992-02-25 1992-02-25 PSK modulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP03740592A JP3229991B2 (en) 1992-02-25 1992-02-25 PSK modulator

Publications (2)

Publication Number Publication Date
JPH05236038A true JPH05236038A (en) 1993-09-10
JP3229991B2 JP3229991B2 (en) 2001-11-19

Family

ID=12496621

Family Applications (1)

Application Number Title Priority Date Filing Date
JP03740592A Expired - Fee Related JP3229991B2 (en) 1992-02-25 1992-02-25 PSK modulator

Country Status (1)

Country Link
JP (1) JP3229991B2 (en)

Also Published As

Publication number Publication date
JP3229991B2 (en) 2001-11-19

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