GB1394551A - System for providing a digital representation of an analogue frequency of an unknown signal - Google Patents

System for providing a digital representation of an analogue frequency of an unknown signal

Info

Publication number
GB1394551A
GB1394551A GB2046573A GB2046573A GB1394551A GB 1394551 A GB1394551 A GB 1394551A GB 2046573 A GB2046573 A GB 2046573A GB 2046573 A GB2046573 A GB 2046573A GB 1394551 A GB1394551 A GB 1394551A
Authority
GB
United Kingdom
Prior art keywords
frequency
signal
converter
gates
circuit
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.)
Expired
Application number
GB2046573A
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.)
Bendix Corp
Original Assignee
Bendix 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 Bendix Corp filed Critical Bendix Corp
Priority to DE2321901A priority Critical patent/DE2321901A1/en
Priority to GB2046573A priority patent/GB1394551A/en
Publication of GB1394551A publication Critical patent/GB1394551A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
    • G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
    • G01R23/10—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage by converting frequency into a train of pulses, which are then counted, i.e. converting the signal into a square wave
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
    • G01S15/02—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems using reflection of acoustic waves
    • G01S15/50—Systems of measurement, based on relative movement of the target
    • G01S15/52—Discriminating between fixed and moving objects or between objects moving at different speeds
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
    • G01S15/02—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems using reflection of acoustic waves
    • G01S15/50—Systems of measurement, based on relative movement of the target
    • G01S15/58—Velocity or trajectory determination systems; Sense-of-movement determination systems
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/12—Analogue/digital converters
    • H03M1/34—Analogue value compared with reference values

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • General Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Theoretical Computer Science (AREA)
  • Measuring Frequencies, Analyzing Spectra (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)

Abstract

1394551 Digital measurement of frequency BENDIX CORP 30 April 1973 20465/73 Heading G4H A circuit for measuring the frequency f x of a signal comprises a zero crossing detector 10, the period of the output of which varies with the frequency f x , gates 14, 18 for receiving a reference frequency signal, a flip-flop 12 for enabling the gates to transmit the reference frequency signal for the period of the detector 10 to counters 22, 24 and control gates 16, 20 for transferring the counts stored in the counters to a digital to analogue converter 26. The circuit may be part of a sonar system in which the signal of frequeney f x is the signal reflected from a moving object. The output pulses from the flip-flop 12 alternately open the pairs of gates 14, 16 and 18, 20 to supply the digital measurement of the frequency stored in the counters 22, 24 to the converter 26. The output of the converter may be supplied to a meter, Fig. 4 (not shown), via a low pass filter and to a comparator, the reference input of which receives a signal corresponding to a minimum Doppler frequency. Signals of a frequency exceeding this reference frequency are supplied to the video gate of a cathode-ray tube circuit. Modifications of the circuit are described to prevent signals corresponding to frequencies outside a predetermined range from being supplied to the converter 26, thereby eliminating frequency measurements corresponding to noise signals.
GB2046573A 1973-04-30 1973-04-30 System for providing a digital representation of an analogue frequency of an unknown signal Expired GB1394551A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE2321901A DE2321901A1 (en) 1973-04-30 1973-04-30 SYSTEM FOR DETECTING FREQUENCY DIFFERENCES OF AN UNKNOWN SIGNAL FROM A RATED FREQUENCY
GB2046573A GB1394551A (en) 1973-04-30 1973-04-30 System for providing a digital representation of an analogue frequency of an unknown signal

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2321901A DE2321901A1 (en) 1973-04-30 1973-04-30 SYSTEM FOR DETECTING FREQUENCY DIFFERENCES OF AN UNKNOWN SIGNAL FROM A RATED FREQUENCY
GB2046573A GB1394551A (en) 1973-04-30 1973-04-30 System for providing a digital representation of an analogue frequency of an unknown signal

Publications (1)

Publication Number Publication Date
GB1394551A true GB1394551A (en) 1975-05-21

Family

ID=25765070

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2046573A Expired GB1394551A (en) 1973-04-30 1973-04-30 System for providing a digital representation of an analogue frequency of an unknown signal

Country Status (2)

Country Link
DE (1) DE2321901A1 (en)
GB (1) GB1394551A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2119526A (en) * 1982-04-19 1983-11-16 Gen Electric Analysing waveforms

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5938776Y2 (en) * 1977-12-23 1984-10-29 日本電気株式会社 Digital tone signal detector
DE3030866A1 (en) * 1980-08-14 1982-03-11 Siemens AG, 1000 Berlin und 8000 München Noise pulse suppression system for e.g. flow measurement appts. - uses summing transducer pulses only after min. number is received

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2119526A (en) * 1982-04-19 1983-11-16 Gen Electric Analysing waveforms

Also Published As

Publication number Publication date
DE2321901A1 (en) 1974-11-14

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee