Communications – electrical: acoustic wave systems and devices – Echo systems – Returned signal used for control
Patent
1990-04-11
1991-11-26
Pihulic, Daniel T.
Communications, electrical: acoustic wave systems and devices
Echo systems
Returned signal used for control
367900, 367135, G01S 1500
Patent
active
050688332
ABSTRACT:
This invention provides an improved circuit for dynamically controlling a predetermined characteristic of each input channel of a system having a plurality of input channels to achieve a desired characteristic profile with predetermined time variances in channel aperture size and/or focal point depth. More particularly, the invention dynamically controls the gain of each input channel to maintain a desired apodization profile. A plurality of basic time varying functions (basis functions) are generated, such functions being, for example, a constant, a ramp, a parabola an exponential or the like, and at least selected ones of the basis functions are combined by appropriately weighting the functions and adding the weighted functions to obtain a desired control signal. The control signal which has the desired dynamic gain characteristic for the given channel is then applied to control a gain-controllable amplifier for such channel. The number of combining elements may be reduced by providing such combining elements for only a selected number of spaced channels and by linearly interpolating the signals obtained from such combining elements for each pair of spaced channels to obtain control signals to control gain for channels between each pair of spaced channels. System gain may also be controled by a signal generated by combining at least selected ones of the basis functions through weighting and adding.
REFERENCES:
patent: 4464738 (1984-08-01), Czajkowski
Hewlett--Packard Company
Perillo Frank R.
Pihulic Daniel T.
LandOfFree
Dynamic control circuit for multichannel system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Dynamic control circuit for multichannel system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dynamic control circuit for multichannel system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2389939