JPS6156517A - Analog-to-digital converter - Google Patents

Analog-to-digital converter

Info

Publication number
JPS6156517A
JPS6156517A JP17743284A JP17743284A JPS6156517A JP S6156517 A JPS6156517 A JP S6156517A JP 17743284 A JP17743284 A JP 17743284A JP 17743284 A JP17743284 A JP 17743284A JP S6156517 A JPS6156517 A JP S6156517A
Authority
JP
Japan
Prior art keywords
input
multiplexer
scanner
gate
conversion
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
Application number
JP17743284A
Other languages
Japanese (ja)
Inventor
Tsutomu Hachisuga
蜂須賀 勉
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
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 Toshiba Corp filed Critical Toshiba Corp
Priority to JP17743284A priority Critical patent/JPS6156517A/en
Publication of JPS6156517A publication Critical patent/JPS6156517A/en
Pending legal-status Critical Current

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  • Analogue/Digital Conversion (AREA)

Abstract

PURPOSE:To obtain an A/D converter having a converting cycle corresponding to the changing speed of an input by changing the converting cycle of an A/D converter which detects plural analog quantities and converts them into the digital quantities in response to the input signals having high and low changing speeds. CONSTITUTION:A scanner 14 serves as an n-notation counter which executes (n) units of scanners for inputs A-An-1 and An in a fixed cycle. A decoder 13 decodes the count value of the pulse signals sent from the scanner 14 and supplies this count result to a multiplexer 12. If the (n-1)-th encoding result is obtained, the multiplexer 12 opens a gate corresponding to the (An-1)-th input. Then the (An)-th gate is opened with the n-th input. In this case, a scanner 141 is actuated with the signal given from a decoder 131. Then the gate of the multiplexer 12 corresponding to the (Bi)-th input among the inputs B1-Bm is opened when the gate corresponding to the input An is opened. Thus the input to be applied to an A/D converter circuit is set at An=Bi.

Description

【発明の詳細な説明】 [発明の技術分野J 本発明はAD変換装置、特にアナログ量をディジタル量
に変換する回路におけるAI)変換の変換周期に関する
ものである。
DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention J] The present invention relates to an AD conversion device, particularly to a conversion cycle of AI conversion in a circuit that converts an analog quantity into a digital quantity.

[発明の技術的背景] 第4図は従来のAD変換装置のブロック図であり、これ
によって以下に説明する。
[Technical Background of the Invention] FIG. 4 is a block diagram of a conventional AD conversion device, which will be explained below.

アナログmは交直変換回路2により交流ωから直流最に
変換されてAD変換装置1の入力回路11に入力される
。入力回路11は抵抗とコンデンサとにより構成された
CRフィルタであり、アナログ量に対応した出力電圧を
次段のマルチプレクサ12に入力する。マルチプレクサ
12にはn個のアナログ量が入力されている。この入力
のうち1個選択するのは、常時定周期で動作しているス
キャナー14の出力を次段のデコーダ13でデコードし
、デコードされた信号をマルチプレクサ12に与える。
The analog m is converted from AC ω to DC by the AC/DC conversion circuit 2 and is input to the input circuit 11 of the AD converter 1 . The input circuit 11 is a CR filter composed of a resistor and a capacitor, and inputs an output voltage corresponding to an analog quantity to a multiplexer 12 at the next stage. N analog quantities are input to the multiplexer 12. One of these inputs is selected by decoding the output of the scanner 14, which is always operating at regular intervals, by the decoder 13 at the next stage, and applying the decoded signal to the multiplexer 12.

マルチプレクサ12はデコーダ13からの信号により、
n個の入力から1個のみの入力ゲートを開き、入力回路
11からの出力電圧をAD変換回路15に入力する。A
D変換のスタートはスキャナー14からの信号により定
周期に動作している。
The multiplexer 12 receives a signal from the decoder 13,
Only one input gate out of n inputs is opened, and the output voltage from the input circuit 11 is input to the AD conversion circuit 15. A
The start of the D conversion operates at regular intervals based on a signal from the scanner 14.

又、AD変換回路15によりアナログがらディジタル値
に変換された変換値はバッファ16にセーブされる。
Further, a converted value converted from an analog value to a digital value by the AD conversion circuit 15 is saved in a buffer 16.

[背景技術の問題点1 上記構成を有する従来のAD変換は、n個の入力に対し
て一律に変換を行なっているので変換の1サイクル時間
は(入力nx′l1yA周期)となり、入力信号の変化
速度が大きくなれば入力点数を減らすか、変換周期を短
くして追随せざるを得ない欠点を有している。
[Problem 1 in the background art] The conventional AD conversion having the above configuration uniformly converts n inputs, so one cycle time of conversion is (input nx'l1yA cycle), and the input signal is If the rate of change increases, the disadvantage is that the number of input points must be reduced or the conversion cycle must be shortened to keep up.

[発明の目的] 本発明は上記問題点を解決するためになされたものであ
り、入力の変化速度に応じた変換周期を有するAD変換
装置を提供1“ることを目的としている。
[Object of the Invention] The present invention has been made in order to solve the above problems, and an object of the present invention is to provide an AD conversion device having a conversion period corresponding to the rate of change of input.

[発明の概要] 本発明では入力信号の変化速度に応じて入力を分割し、
変化速度の大きい入力信号については毎サイクル変換を
行ない、変化速度の小さい人力信号については分割した
変換を行なうものである。
[Summary of the invention] The present invention divides the input according to the rate of change of the input signal,
Input signals with a high rate of change are converted every cycle, and input signals with a low rate of change are converted in divided units.

[発明の実施例] 以下図面を参照して実施例を説明する。第1図は本発明
によるAD変換装置の一実施例の構成である。
[Embodiments of the Invention] Examples will be described below with reference to the drawings. FIG. 1 shows the configuration of an embodiment of an AD conversion device according to the present invention.

図中の符号121.131.141以外は第4図に対応
している。スキ1!ナー14は入力A1〜AFL−1、
ArLのn個の入力のスキャナーを一定周期で実行する
ためのn進カウンタである。デコーダ13はスキャナー
14からのパルス信号のカウント値をデコードして、そ
の結果をマルチプレクサ12へ入力する。この時のデコ
ード結果が(n−1)番目であると、マルチプレクサ1
2はA rb−1番目の入力に該当するゲートを開く。
Components other than numerals 121, 131, and 141 in the figure correspond to those in FIG. Like 1! ner 14 has inputs A1 to AFL-1,
This is an n-ary counter for scanning n inputs of ArL at regular intervals. The decoder 13 decodes the count value of the pulse signal from the scanner 14 and inputs the result to the multiplexer 12. If the decoding result at this time is the (n-1)th one, multiplexer 1
2 opens the gate corresponding to the Arb-1st input.

又、n番目の時はマルチプレクサ12はΔル番目のゲー
トを開く。この時の入力はデコーダ13からの信号を受
けてスキャナー141が動作する。スキャナー141は
1〜量をカウントするm進カウンタである。スキャナー
141の信号をデコーダ131でデコードしてAnに該
当するマルチプレクサ12のゲートが開いた時には、8
1〜BaのBt番目に該当するマルチプレクサ121の
ゲートが聞くので、AD変換回路への入力はAn−Bt
、どなる。 第2図に全入力点数= (n−1)÷1個
のAD変換のタイムチャートを示す。スキャナー14は
n進カウンタで1〜nのカウントを常時行なう。この信
号をデコーダ13が受けてデコード結果(1,2、・・
・n−1,n >をマルチプレクサ12へ入力する。
Also, at the n-th time, the multiplexer 12 opens the ΔR-th gate. At this time, the scanner 141 operates upon receiving a signal from the decoder 13. The scanner 141 is an m-ary counter that counts from 1 to an amount. When the signal from the scanner 141 is decoded by the decoder 131 and the gate of the multiplexer 12 corresponding to An is opened, 8
Since the gate of the multiplexer 121 corresponding to the Btth number of 1 to Ba is heard, the input to the AD conversion circuit is An-Bt.
,bawl. FIG. 2 shows a time chart of AD conversion where total number of input points=(n-1)÷1. The scanner 14 always counts from 1 to n using an n-ary counter. The decoder 13 receives this signal and the decoding result (1, 2,...
- Input n-1,n> to the multiplexer 12.

マルチプレクサ12はデコード信号によりゲートを1〜
nの順番に開き、その時の入力信号をAD変換人力A1
〜AnとしてAD変換回路15に入力する。デコード結
果がnの時には、この信号をマルチプレクサ12の他に
スキャナー141に入力する。
The multiplexer 12 switches the gates from 1 to 1 according to the decoded signal.
Open in the order of n, and convert the input signal at that time to AD conversion manually A1
~An is input to the AD conversion circuit 15. When the decoding result is n, this signal is input to the scanner 141 in addition to the multiplexer 12.

スキャナー141は、この信号により トIをカウント
するm進カウンタであり、このカウント値をデコーダ1
31へ入力する。デコーダ131はデコーダ13と同じ
動作、即ら、1〜mのデコードを行なう。デコードされ
た信号はマルチプレクサ121に入力され、デコード信
号=もであれば、マルチプレクサ121はL番目のゲー
トを開き、入力信号Btをマルチプレクサ12を通して
AD変換回路15へ入力する。
The scanner 141 is an m-ary counter that counts tI based on this signal, and this count value is sent to the decoder 1.
31. Decoder 131 performs the same operation as decoder 13, ie, decodes 1 to m. The decoded signal is input to the multiplexer 121, and if the decoded signal=also, the multiplexer 121 opens the L-th gate and inputs the input signal Bt to the AD conversion circuit 15 through the multiplexer 12.

即ち、AD変換回路への入力は、 A1〜ArL−1、B1、A1〜An−1、B2・・・
・・・A、〜Aよ1.13m 、A1− のようになる
That is, the inputs to the AD conversion circuit are A1 to ArL-1, B1, A1 to An-1, B2...
...A, ~A yo 1.13m, A1-.

スキャナー14の周期=Tsとすると、入力信号A、〜
ArL−1に対してのAD変換周期T+=Tsx n(
sec)となる。入力信号81〜F3m対してのAD変
挽周期Tz = (Ts x n) x m(sec)
となる。
If the period of the scanner 14 = Ts, then the input signals A, ~
AD conversion period T+=Tsx n(
sec). AD variation period Tz for input signal 81 to F3m = (Ts x n) x m (sec)
becomes.

即ち、入力信号の変化速度が大きい信号A1−八よ、に
対してはT1の周期で、小さい信号81〜13mに対し
てはT2の周期で行なえることとなる。
That is, it can be performed in a period of T1 for the signals A1-8, which have a large rate of change of the input signal, and in a period of T2 for the signals 81-13m, which have a small rate of change.

第3図は他の実施例である。図中の符号11以外は第1
図と同一である。入力信号81〜Bmに、AD変換器の
変換精度をチェックするための目的で基準電圧発生回路
17の信号を割付けた回路である。即ち、短周期で外部
からの入力信号A1〜AA−1の変換を行ない、AD変
換器の精度をチェックする周期は入力信号A1〜八ル1
と同じ周期で変換せず、比較的長周期で行なう実施例で
ある。
FIG. 3 shows another embodiment. Items other than numeral 11 in the figure are the first
Same as figure. This is a circuit in which a signal from the reference voltage generation circuit 17 is assigned to the input signals 81 to Bm for the purpose of checking the conversion accuracy of the AD converter. That is, the input signals A1 to AA-1 from the outside are converted in short cycles, and the period for checking the accuracy of the AD converter is the input signals A1 to AA-1.
This is an embodiment in which the conversion is not performed at the same period as , but is performed at a relatively long period.

基準電圧発生回路17はAD変換器の精度をチェックす
る目的で、例えば0%、±10%・・・、± 100%
の電圧を出力する回路である。
The reference voltage generation circuit 17 is used to check the accuracy of the AD converter, for example, 0%, ±10%..., ±100%.
This is a circuit that outputs a voltage of .

[発明の効果] 以上説明した如く、本発明によれば複数の入力に対して
一律にAD変換を行なわないので、入力数が増加しても
一人力毎のAD変換周期を短くすることなく、入力の変
化速度に対応したAD変換が行なえるAD変換装置を提
供できる。
[Effects of the Invention] As explained above, according to the present invention, AD conversion is not uniformly performed for multiple inputs, so even if the number of inputs increases, the AD conversion cycle for each person can be maintained without shortening. It is possible to provide an AD conversion device that can perform AD conversion corresponding to the rate of change of input.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明によるAD変換装置の一実施例構成図、
第2図は動作説明のタイムチャート、第3図は本発明に
よる他の実施例図、第4図は従来のAD変換装置のブロ
ック図である。 1・・・・・・AD変換装置   2・・・・・・交直
変換回路11・・・・・・入力回路     12・・
・・・・マルチプレクサ13・・・・・・デコーダ  
   14・・・・・・スキシナ−15・・・・・・A
D変換回路   16・・・・・・バッファ17・・・
・・・基準電圧発生回路 121・・・マルチプレクサ
131・・・デコーダ     141・・・スキャナ
ー(7317)代理人 弁理士 則近憲佑(他1名) 第4図
FIG. 1 is a configuration diagram of an embodiment of an AD conversion device according to the present invention,
FIG. 2 is a time chart for explaining the operation, FIG. 3 is a diagram of another embodiment according to the present invention, and FIG. 4 is a block diagram of a conventional AD converter. 1... AD conversion device 2... AC/DC conversion circuit 11... Input circuit 12...
...Multiplexer 13 ...Decoder
14...Sukishina-15...A
D conversion circuit 16...Buffer 17...
... Reference voltage generation circuit 121 ... Multiplexer 131 ... Decoder 141 ... Scanner (7317) Agent Patent attorney Kensuke Norichika (1 other person) Figure 4

Claims (1)

【特許請求の範囲】[Claims] 複数のアナログ量を検出してディジタル量に変換するA
D変換装置において、変化速度の大きい入力信号と小さ
い入力信号とに応じて変換周期を変えることを特徴とす
るAD変換装置。
A that detects multiple analog quantities and converts them into digital quantities
An AD converter characterized in that the conversion period is changed depending on an input signal having a high rate of change or an input signal having a low rate of change.
JP17743284A 1984-08-28 1984-08-28 Analog-to-digital converter Pending JPS6156517A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17743284A JPS6156517A (en) 1984-08-28 1984-08-28 Analog-to-digital converter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17743284A JPS6156517A (en) 1984-08-28 1984-08-28 Analog-to-digital converter

Publications (1)

Publication Number Publication Date
JPS6156517A true JPS6156517A (en) 1986-03-22

Family

ID=16030836

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17743284A Pending JPS6156517A (en) 1984-08-28 1984-08-28 Analog-to-digital converter

Country Status (1)

Country Link
JP (1) JPS6156517A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63185225A (en) * 1987-01-28 1988-07-30 Yokogawa Electric Corp Waveform storage device
JPS6430329A (en) * 1987-07-27 1989-02-01 Mitsubishi Electric Corp A/d converting unit
JPH0266034U (en) * 1988-11-09 1990-05-18
JPH02158217A (en) * 1988-12-12 1990-06-18 Iwatsu Electric Co Ltd Method of processing multi-channel signal
JP2008301456A (en) * 2007-06-04 2008-12-11 Yamaha Motor Electronics Co Ltd A/d conversion apparatus

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63185225A (en) * 1987-01-28 1988-07-30 Yokogawa Electric Corp Waveform storage device
JPS6430329A (en) * 1987-07-27 1989-02-01 Mitsubishi Electric Corp A/d converting unit
JPH0616589B2 (en) * 1987-07-27 1994-03-02 三菱電機株式会社 A / D conversion unit
JPH0266034U (en) * 1988-11-09 1990-05-18
JPH02158217A (en) * 1988-12-12 1990-06-18 Iwatsu Electric Co Ltd Method of processing multi-channel signal
JP2008301456A (en) * 2007-06-04 2008-12-11 Yamaha Motor Electronics Co Ltd A/d conversion apparatus

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