JPH0368088U - - Google Patents
Info
- Publication number
- JPH0368088U JPH0368088U JP12889689U JP12889689U JPH0368088U JP H0368088 U JPH0368088 U JP H0368088U JP 12889689 U JP12889689 U JP 12889689U JP 12889689 U JP12889689 U JP 12889689U JP H0368088 U JPH0368088 U JP H0368088U
- Authority
- JP
- Japan
- Prior art keywords
- signal
- variable capacitance
- capacitance diode
- low
- pass filter
- 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
Links
- 238000001514 detection method Methods 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 4
Landscapes
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
- Ultra Sonic Daignosis Equipment (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Description
第１図は本考案の一実施例によるローパスフイ
ルタの回路図、第２図は本考案の一実施例が採用
された超音波診断装置の受信系のブロツク図、第
３Ａ図は検波入力の波形図、第３Ｂ図は検波出力
の波形図、第４図は可変容量ダイオードの容量Ｃ
と制御電源の制御電圧ＶＲとの関係を示す図、第
５図は本考案の他の実施例によるローパスフイル
タの回路図である。
１……トランスデユーサ、２……整相加算回路
、３……対数増幅回路、４……検波回路、５……
ローパスフイルタ、６……Ａ／Ｄコンバータ、１
０，１５……可変容量ダイオード、１１，１６…
…制御電源。
Fig. 1 is a circuit diagram of a low-pass filter according to an embodiment of the present invention, Fig. 2 is a block diagram of a receiving system of an ultrasonic diagnostic apparatus employing an embodiment of the present invention, and Fig. 3A is a waveform of the detection input. Figure 3B is a waveform diagram of the detection output, Figure 4 is the capacitance C of the variable capacitance diode.
FIG. 5 is a circuit diagram of a low-pass filter according to another embodiment of the present invention. 1...transducer, 2...phasing and addition circuit, 3...logarithmic amplifier circuit, 4...detection circuit, 5...
Low-pass filter, 6...A/D converter, 1
0,15...variable capacitance diode, 11,16...
...Control power supply.
Claims (1)
コー信号を検波して得られた検波信号から低周波
成分である画像信号を取り出すためのローパスフ
イルタであつて、 検波出力信号が接続された可変容量ダイオード
と、 前記可変容量ダイオードの容量をコントロール
するためのコントロール手段とを備え、 前記検波出力信号は、その信号レベルが大きい
とき前記可変容量ダイオードの容量が小さくなり
信号レベルが小さいとき容量が大きくなるよう、
前記可変容量ダイオードに接続されている、超音
波診断装置のローパスフイルタ。[Scope of Claim for Utility Model Registration] A low-pass filter for extracting an image signal, which is a low frequency component, from a detection signal obtained by detecting a reflected echo signal from a subject in an ultrasonic diagnostic device, which has a detection output. A variable capacitance diode connected to a signal, and a control means for controlling the capacitance of the variable capacitance diode, and the detection output signal is such that when the signal level is high, the capacitance of the variable capacitance diode becomes small and the signal level is lowered. so that the capacity increases when is small,
A low-pass filter of an ultrasonic diagnostic apparatus connected to the variable capacitance diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12889689U JPH0368088U (en) | 1989-11-01 | 1989-11-01 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12889689U JPH0368088U (en) | 1989-11-01 | 1989-11-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0368088U true JPH0368088U (en) | 1991-07-03 |
Family
ID=31676567
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12889689U Pending JPH0368088U (en) | 1989-11-01 | 1989-11-01 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0368088U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000033490A1 (en) * | 1998-11-30 | 2000-06-08 | Fujitsu Limited | Optical transceiver module |
| JP2006172329A (en) * | 2004-12-20 | 2006-06-29 | Token Corp | Business performance evaluation system and business performance evaluation program |
-
1989
- 1989-11-01 JP JP12889689U patent/JPH0368088U/ja active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000033490A1 (en) * | 1998-11-30 | 2000-06-08 | Fujitsu Limited | Optical transceiver module |
| JP2006172329A (en) * | 2004-12-20 | 2006-06-29 | Token Corp | Business performance evaluation system and business performance evaluation program |
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