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Title: US4617536: Amplitude modulation apparatus and method
[ Derwent Title ]

Country: US United States of America

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12 pages

Inventor: Richard, Gordon L.; Minco, OK

Assignee: Baptist Medical Center of Oklahoma, Inc., Oklahoma City, OK
other patents from BAPTIST MEDICAL CENTER OF OKLAHOMA, INC. (52880) (approx. 5)
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Published / Filed: 1986-10-14 / 1984-06-15

Application Number: US1984000621181

IPC Code: Advanced: H03C 1/02; H04R 25/00;
IPC-7: H03C 1/08; H04R 25/00;

ECLA Code: H03C1/02; H04R25/35B; T04R25/35D; T04R25/60D1;

U.S. Class: Current: 332/156; 332/177; 381/312; 381/314; 455/108;
Original: 332/037.D; 179/107.FD; 332/038; 332/052; 381/068; 455/108;

Field of Search: 332/31 R,31 T,37 R,37 D,38,52 455/108 381/068 179/107 R,107 FD

Priority Number:
1984-06-15  US1984000621181
1982-11-24  US1982000444460

Abstract:     An apparatus and a method modulate a carrier signal so that the resultant modulated signal varies between a value substantially equal to the quiescent level of the carrier signal and peak values up to several hundred percent of the quiescent level of the carrier signal. The apparatus includes an electrical circuit for adjusting the modulating signal so that it is clamped at a reference value to prevent overmodulation. The clamped signal controls a variable resistance mechanism which forms a part of the gain determining portion of a modulator circuit including an amplifier. The amplifier modulates the carrier signal in accordance with the gain determined by the variable resistance. The variable resistance is controlled by the clamped signal so that it causes the gain of the amplifier circuit to vary between approximately one and a value greater than one. So that the apparatus can be used by a person having a hearing impediment wherein the dynamic range detectable by the user is less than the dynamic range detectable by a normal ear, the apparatus also includes a circuit which compresses a detected acoustical signal which is within a first dynamic range into an electrical modulating signal within a dynamic range which is smaller than the first dynamic range and which is within the dynamic range perceivable by the user of the apparatus.

Attorney, Agent or Firm: Laney, Dougherty, Hessin, Claro & Beavers ;

Primary / Asst. Examiners: Grimm, Siegfried H.;

Maintenance Status: E2 Expired  Check current status
CC Certificate of Correction issued

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Related Applications:
Application Number Filed Patent Pub. Date  Title
US1982000444460 1982-11-24    1985-02-12  Amplitude modulation apparatus and method

Parent Case:     This is a division of application Ser. No. 444,460, filed Nov. 24, 1982, now U.S. Pat. No. 4,499,339.

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First Claim:
Show all 15 claims
What is claimed is:     1. In an amplitude modulation apparatus of the type wherein a modulating signal having a peak-to-peak value is used for modulating a carrier signal having a quiescent peak-to-peak value, the improvement comprising modulation means for providing a modulated signal having peak-to-peak values within a range, and only within said range, between a value substantially equal to said quiescent peak-to-peak value and a value which is a multiple of said quiescent peak-to-peak value, said multiple being determined by said modulating signal peak-to-peak value, said modulating signal having magnitude excursions in two directions between upper peak values and lower peak values; and said modulation means including:
signal conditioning means for shifting said modulating signal by a variable amount so that said magnitude excursions in one of said two directions never exceed a predetermined value; and
carrier signal modulator means, responsive to said signal conditioning means, for multiplying the magnitude of said carrier signal by variable multiplication factors.

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Forward References: Show 5 U.S. patent(s) that reference this one

U.S. References: Go to Result Set: All U.S. references   |  Forward references (5)   |   Backward references (4)   |   Citation Link

Patent  Pub.Date  Inventor Assignee   Title
Get PDF - 7pp US2063278* 1936-12 Von Wedel    
Get PDF - 5pp US4052572  1977-10 Schafer  Electro-Physical Research, Inc. Hearing aid
Get PDF - 6pp US4063048  1977-12 Kissiah, Jr.   Implantable electronic hearing aid
Get PDF - 15pp US4225822  1980-09 Kariatsumari  Tokyo Shibaura Electric Co., Ltd. Amplitude modulation circuit for a transmitter
  * some details unavailable
Foreign References:
Publication Date IPC Code Assignee   Title
Get PDF - 15pp EP0054450 1982-06  H04R 25/00 Lafon, Jean-Claude Hearing aid devices 

Other Abstract Info: DERABS G85-056033

Other References:
  • Sigma 7 Cochler Implant Stimulator Unit, Walt Disney Hearing Rehabilitation Research Center, Mar. 1980.

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