JPS6438666A - Variation threshold value circuit - Google Patents
Variation threshold value circuitInfo
- Publication number
- JPS6438666A JPS6438666A JP62195668A JP19566887A JPS6438666A JP S6438666 A JPS6438666 A JP S6438666A JP 62195668 A JP62195668 A JP 62195668A JP 19566887 A JP19566887 A JP 19566887A JP S6438666 A JPS6438666 A JP S6438666A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- threshold value
- signal
- env
- switch
- 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
Links
- 238000001514 detection method Methods 0.000 abstract 3
- 238000012935 Averaging Methods 0.000 abstract 2
Landscapes
- Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
- Measurement Of Current Or Voltage (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
PURPOSE:To obtain a threshold value circuit capable of setting the threshold value corresponding to the level of back noise, by providing an averaging circuit, a holding circuit, an adder circuit, a comparing circuit, a switch, a control circuit etc. CONSTITUTION:An envelope detection circuit 11 performs the envelope detection of an input signal and a holding circuit 21 holds the average value signal AVE outputted from an integrating circuit 12 as one embodiment of an averaging circuit. Adder circuits 14, 17 are predetermined values to the signal AVE to form threshold values VL, VH and comparing circuits 15, 18 compare said threshold values VL, VH with an envelope detection signal ENV. A switch 22 inputs the signal ENV and the signal AVE held to the circuit 21 to the circuit 12 while changes over both of them. A control circuit 23 receives the output from the circuit 15 and changes over the switch 22 to the circuit 21 when the signal ENV exceeds the threshold value VL and changes over the same to the signal ENV when the signal ENV does not exceed the threshold value VL. The threshold value thus set accurately follows the level of back noise.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62195668A JPH0675082B2 (en) | 1987-08-04 | 1987-08-04 | Variable threshold circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62195668A JPH0675082B2 (en) | 1987-08-04 | 1987-08-04 | Variable threshold circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6438666A true JPS6438666A (en) | 1989-02-08 |
| JPH0675082B2 JPH0675082B2 (en) | 1994-09-21 |
Family
ID=16345009
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62195668A Expired - Lifetime JPH0675082B2 (en) | 1987-08-04 | 1987-08-04 | Variable threshold circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0675082B2 (en) |
-
1987
- 1987-08-04 JP JP62195668A patent/JPH0675082B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0675082B2 (en) | 1994-09-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPS648465A (en) | Tri-state bus circuit | |
| GB1536623A (en) | Integrated circuits | |
| US3818251A (en) | Monolithic integrated master-slave flip-flop circuit | |
| JPS6438666A (en) | Variation threshold value circuit | |
| EP0381217A3 (en) | Signal level detecting circuits | |
| JPS562767A (en) | Impulsive noise eliminating circuit | |
| JPS56115024A (en) | Automatic threshold level setting circuit | |
| JPS53110314A (en) | Auto-search tuning circuit | |
| JPS572171A (en) | Detecting circuit for fault in signal level | |
| JPS57194378A (en) | Test circuit of electronic clock | |
| SU1053282A1 (en) | Delay device | |
| JPS6439112A (en) | Signal detecting circuit | |
| SU499669A2 (en) | Optoelectronic switch | |
| JPS54150908A (en) | Squelch circuit | |
| JPS54121611A (en) | Noise eliminating circuit | |
| JPS5485660A (en) | Unlock signal detection circuit of pll | |
| JPS6436281A (en) | Action detecting circuit | |
| JPS53110352A (en) | Automatic gain control circuit | |
| JPS5455343A (en) | Level discrimination circuit | |
| JPS5723334A (en) | Tuning circuit equipped with vco | |
| JPS5684059A (en) | Discriminating circuit | |
| JPS5480063A (en) | Low-frequency switch circuit | |
| JPS5283055A (en) | Logical circuit with majority decision function and selection function | |
| JPS55109011A (en) | Automatic gain control circuit | |
| JPS5493902A (en) | Tone signal detector circuit |