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GB1454894A - Loudspeakers and circuit arrangements therefor - Google Patents

Loudspeakers and circuit arrangements therefor

Info

Publication number
GB1454894A
GB1454894A GB4151772A GB4151772A GB1454894A GB 1454894 A GB1454894 A GB 1454894A GB 4151772 A GB4151772 A GB 4151772A GB 4151772 A GB4151772 A GB 4151772A GB 1454894 A GB1454894 A GB 1454894A
Authority
GB
United Kingdom
Prior art keywords
coils
coil
loudspeakers
loudspeaker
impedance
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
GB4151772A
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.)
EMI Ltd
Original Assignee
EMI Ltd
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 EMI Ltd filed Critical EMI Ltd
Priority to GB4151772A priority Critical patent/GB1454894A/en
Publication of GB1454894A publication Critical patent/GB1454894A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S5/00—Pseudo-stereo systems, e.g. in which additional channel signals are derived from monophonic signals by means of phase shifting, time delay or reverberation 
    • H04S5/02—Pseudo-stereo systems, e.g. in which additional channel signals are derived from monophonic signals by means of phase shifting, time delay or reverberation  of the pseudo four-channel type, e.g. in which rear channel signals are derived from two-channel stereo signals

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)

Abstract

1454894 Loudspeakers; surround sound EMI Ltd 26 Nov 1973 [7 Sept 1972] 41517/72 Addition to 1348643 Headings H4R and H4J A circuit arrangement for producing surround sound from channels L, R includes four loud speakers 1, 2, 3, 4. Loudspeakers 1 and 4 each have a diaphragm with a voice coil 6 and 7 connected respectively to channels R and L. The louspeakers 2 and 3 each have two voice coils on a common former and separate electrical connections so that the ratio of the sound output from each coil is substantially 2À2 : 1. The ratio of the impedence of the coils at 400 Hz is preferably 11 : 5. The lower impedance voice coil 8 of loudspeaker 2 and the higher impedance voice coil 10 of loudspeaker 3 are connected in series to channel L and the lower impedence voice coil 11 of loudspeaker 3 and the higher impedance voice coil 9 of loudspeaker 2 are connected in series to channel R. Coils 8 and 11 are 5 ohm coils while coils 9 and 10 are typically 11 ohm coils giving an impedance ratio of 2À2 : 1. The voice coils of loudspeakers 2 and 3 are formed by winding the higher impedance coil on a former, winding double sided adhesive polyester tape over the coil and then winding the lower impedance coil on the tape. Thermosetting adhesive on the tape is baked to secure the two coils together.
GB4151772A 1972-09-07 1972-09-07 Loudspeakers and circuit arrangements therefor Expired GB1454894A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4151772A GB1454894A (en) 1972-09-07 1972-09-07 Loudspeakers and circuit arrangements therefor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4151772A GB1454894A (en) 1972-09-07 1972-09-07 Loudspeakers and circuit arrangements therefor

Publications (1)

Publication Number Publication Date
GB1454894A true GB1454894A (en) 1976-11-03

Family

ID=10420055

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4151772A Expired GB1454894A (en) 1972-09-07 1972-09-07 Loudspeakers and circuit arrangements therefor

Country Status (1)

Country Link
GB (1) GB1454894A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4321428A (en) * 1978-11-24 1982-03-23 Hitachi, Ltd. Acoustic monolithic power semiconductor integrated circuit and acoustic system using the same
US4847904A (en) * 1988-04-01 1989-07-11 Boston Acoustics, Inc. Ambient imaging loudspeaker system
US5742691A (en) * 1997-02-21 1998-04-21 Ambourn; Paul R. Surround sound converter

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4321428A (en) * 1978-11-24 1982-03-23 Hitachi, Ltd. Acoustic monolithic power semiconductor integrated circuit and acoustic system using the same
US4847904A (en) * 1988-04-01 1989-07-11 Boston Acoustics, Inc. Ambient imaging loudspeaker system
US5742691A (en) * 1997-02-21 1998-04-21 Ambourn; Paul R. Surround sound converter

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Legal Events

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