GB1121322A - Improvements in or relating to sirens - Google Patents

Improvements in or relating to sirens

Info

Publication number
GB1121322A
GB1121322A GB3402964A GB3402964A GB1121322A GB 1121322 A GB1121322 A GB 1121322A GB 3402964 A GB3402964 A GB 3402964A GB 3402964 A GB3402964 A GB 3402964A GB 1121322 A GB1121322 A GB 1121322A
Authority
GB
United Kingdom
Prior art keywords
pneumatic
code
aug
employed
shift register
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
GB3402964A
Inventor
Patrick Christopher Parks
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.)
National Research Development Corp UK
Original Assignee
National Research Development Corp UK
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 National Research Development Corp UK filed Critical National Research Development Corp UK
Priority to GB3402964A priority Critical patent/GB1121322A/en
Publication of GB1121322A publication Critical patent/GB1121322A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K7/00—Sirens
    • G10K7/02—Sirens in which the sound-producing member is rotated manually or by a motor

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)

Abstract

1,121,322. " White noise " generator. NATIONAL RESEARCH DEVELOPMENT CORP. 20 Aug., 1965 [20 Aug., 1964], No. 34029/64. Heading G5J. In a siren a flow of compressed gas is modulated to produce a non-uniform sequence of pneumatic pulses, spaced, and with length selected, according to a mathematical code such that the output comprises a large number of harmonics of the fundamental recurrence frequency of the non-uniform sequence. The sound resulting has an energy level that is approximately the same over a wide range of frequencies, and may be employed to simulate the noise of jet engines. Modulation of the gas stream may be by irregularly placed slots or holes in a moving tape, preferably endless, or in a drum, disc or annulus, the slots being punched according to, for example, a linear recurring sequence code. Alternatively the emission of pulses may be controlled by a pneumatic jet amplifier, responding to a planned code stored in the form of a perforated tape or generated by a pneumatic shift register, or a valve controlled by an electronic shift register may be employed to pulse the gas stream.
GB3402964A 1964-08-20 1964-08-20 Improvements in or relating to sirens Expired GB1121322A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3402964A GB1121322A (en) 1964-08-20 1964-08-20 Improvements in or relating to sirens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3402964A GB1121322A (en) 1964-08-20 1964-08-20 Improvements in or relating to sirens

Publications (1)

Publication Number Publication Date
GB1121322A true GB1121322A (en) 1968-07-24

Family

ID=10360478

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3402964A Expired GB1121322A (en) 1964-08-20 1964-08-20 Improvements in or relating to sirens

Country Status (1)

Country Link
GB (1) GB1121322A (en)

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