JPS5789323A - Digital filter - Google Patents
Digital filterInfo
- Publication number
- JPS5789323A JPS5789323A JP16525680A JP16525680A JPS5789323A JP S5789323 A JPS5789323 A JP S5789323A JP 16525680 A JP16525680 A JP 16525680A JP 16525680 A JP16525680 A JP 16525680A JP S5789323 A JPS5789323 A JP S5789323A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- receiver
- pulse width
- upper limit
- lower limit
- 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
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H17/00—Networks using digital techniques
- H03H17/02—Frequency selective networks
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Mathematical Physics (AREA)
- Networks Using Active Elements (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Abstract
PURPOSE:To permit an optional band signal of the sharp frequency characteristics to pass through a filter, by permitting a received signal to pass through the filter only when one wavelength of this received signal is between upper limit and lower limit frequencies. CONSTITUTION:A received ultrasonic signal is converted to an electric signal by a wave receiver 1 and is amplified by a receiver 2 and is applied to an A/D converter 3 and a switch 6. Next, set values for upper limit and lower limit pulse widths from a pulse width setting device 5 are compared with the signal from the A/D converter 3 by a digital pulse width comparator 4. When upper limit and lower limit frequencies of a required band of the receiver are denoted as fH and fL respectively, their pulse widths tH and tL become 1/fH and 1/fL respectively; and when the frequency of the received signal is denoted as (f), its pulse width (t) becomes 1/f. If a signal is sent from the comparator 4 for tH<= t<=tL on a basis of these relations to turn on the switch 6, the output signal of the receiver 2 is carried to the next stage only when fL<=f<=fH is satisfied.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16525680A JPS5789323A (en) | 1980-11-26 | 1980-11-26 | Digital filter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16525680A JPS5789323A (en) | 1980-11-26 | 1980-11-26 | Digital filter |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5789323A true JPS5789323A (en) | 1982-06-03 |
JPS642291B2 JPS642291B2 (en) | 1989-01-17 |
Family
ID=15808855
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16525680A Granted JPS5789323A (en) | 1980-11-26 | 1980-11-26 | Digital filter |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5789323A (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5011154A (en) * | 1973-05-29 | 1975-02-05 |
-
1980
- 1980-11-26 JP JP16525680A patent/JPS5789323A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5011154A (en) * | 1973-05-29 | 1975-02-05 |
Also Published As
Publication number | Publication date |
---|---|
JPS642291B2 (en) | 1989-01-17 |
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