Title:
CONTROLLER FOR FM 412 MULTIPLEX POWER REGULATION
Document Type and Number:
WIPO Patent Application WO2002089460
Kind Code:
A3
Abstract:
A feedback controller, in an FM audio processor, controls the "integrated multiplex power" to the requirements of ITU-R 412. This regulation specifies the maximum power that is equal to the power of a sinewave modulatinmg the carrier +/-19kHz /where +/-75kHz. The controller applies the square (190) of the multiplex signal (220) to an integrator (220). A constant (180) is removed from the integrator, representing the maximum power threshold. The output (230) of the integrator is sampled periodically with a sample-and-hold circuit (240). A second integrator (280) receives the output (250) of the sample-and-hold. The output (290) of the second integrator circuit is added to the threshold setting (330) of a compressor (110), which determines the average power output of the compressor. The output (120) of the compressor is applied through a peak controller (130) to the input of the multiplex coder (150), closing a feedback loop, which controls the integrated multiplex power to a preset threshold.
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Inventors:
ORBAN ROBERT A (US)
Application Number:
PCT/US2002/013569
Publication Date:
February 06, 2003
Filing Date:
April 30, 2002
Export Citation:
Assignee:
ORBAN INC A CRL SYSTEMS INC CO (US)
ORBAN ROBERT A (US)
ORBAN ROBERT A (US)
International Classes:
H03G11/00; H04H20/48; H04H1/00; (IPC1-7): H04H5/00
Foreign References:
| US4466119A | 1984-08-14 | |||
| US5528695A | 1996-06-18 | |||
| US5796842A | 1998-08-18 | |||
| US5920631A | 1999-07-06 | |||
| US6195438B1 | 2001-02-27 |
Other References:
See also references of EP 1428337A4
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