GB1386220A - Audible frequency indicating device - Google Patents

Audible frequency indicating device

Info

Publication number
GB1386220A
GB1386220A GB4563573A GB4563573A GB1386220A GB 1386220 A GB1386220 A GB 1386220A GB 4563573 A GB4563573 A GB 4563573A GB 4563573 A GB4563573 A GB 4563573A GB 1386220 A GB1386220 A GB 1386220A
Authority
GB
United Kingdom
Prior art keywords
frequency
converter
output
microphone
electronic switches
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
GB4563573A
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.)
Pope B C
Original Assignee
Pope B C
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 Pope B C filed Critical Pope B C
Priority to GB4563573A priority Critical patent/GB1386220A/en
Publication of GB1386220A publication Critical patent/GB1386220A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10G—REPRESENTATION OF MUSIC; RECORDING MUSIC IN NOTATION FORM; ACCESSORIES FOR MUSIC OR MUSICAL INSTRUMENTS NOT OTHERWISE PROVIDED FOR, e.g. SUPPORTS
    • G10G7/00—Other auxiliary devices or accessories, e.g. conductors' batons or separate holders for resin or strings
    • G10G7/02—Tuning forks or like devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H3/00—Measuring characteristics of vibrations by using a detector in a fluid
    • G01H3/04—Frequency
    • G01H3/06—Frequency by electric means

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)

Abstract

1386220 Tuning musical instruments B C POPE 29 Sept 1973 45635/73 Heading G5J A frequency detector, e.g. for use in tuning pianofortes comprises a microphone A feeding a frequency converter C and fixed reference frequency generator D. The frequency converter C is adjustable so that its output equals the reference frequency if the frequency detected by the microphone is at its nominal frequency and varies from the reference frequency if the detected note is out of tune. The outputs of reference generator D and frequency converter C are connected alternately through electronic switches E1, E2 to a frequency to voltage converter G the output of which is connected by electronic switches H1, H2 to the inputs of a differential amplifier J. The amplifier output is shown on meter M. The frequency to voltage converter G preferably comprises a voltagecontrolled oscillator and a multiplying circuit in a phase-locked-loop. An amplitude sensor B renders the circuit inoperative if the audible signal entering A falls below a predetermined level.
GB4563573A 1973-09-29 1973-09-29 Audible frequency indicating device Expired GB1386220A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4563573A GB1386220A (en) 1973-09-29 1973-09-29 Audible frequency indicating device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4563573A GB1386220A (en) 1973-09-29 1973-09-29 Audible frequency indicating device

Publications (1)

Publication Number Publication Date
GB1386220A true GB1386220A (en) 1975-03-05

Family

ID=10437981

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4563573A Expired GB1386220A (en) 1973-09-29 1973-09-29 Audible frequency indicating device

Country Status (1)

Country Link
GB (1) GB1386220A (en)

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Legal Events

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