Television – Image signal processing circuitry specific to television – Noise or undesired signal reduction
Patent
1991-08-29
1994-02-08
Powell, Mark R.
Television
Image signal processing circuitry specific to television
Noise or undesired signal reduction
H04N 521
Patent
active
052852792
ABSTRACT:
A transmission distortion elimination device for eliminating from a transmitted TV signal, for example, signal distortion such as ghost under fuzzy inferenced control based on an iterative correction method with the capabilities of fast control settling, and a flexible and stable distortion removal operation. The device comprises a filter section for suppressing such transmission distortion as ghost, a controller for controlling the tap coefficients of the filter section, and a fuzzy inference section for receiving distortion information obtained by the controller. The fuzzy inference section iteratively infers and evaluates a correction value of tap coefficients of the filter section. The tap coefficient correction value is determined through fuzzy inference, and the control method for counteracting disturbance coefficients to the control system is described in rules of IF-THEN form based on fuzzy levels, which facilitates the organization of the control algorithm. By the capability of deriving from these rules the correction value which is made continuously variable, the fast control settling, and the stable and flexible transmission distortion elimination operation can be accomplished.
REFERENCES:
patent: 4389623 (1983-06-01), Onishi et al.
patent: 4404600 (1983-09-01), Murakami
patent: 4575857 (1986-03-01), Murakami
patent: 5144414 (1992-04-01), Nishi et al.
Sakurai et al; On the Long Term Instability of Adaptive Filters; 1985; IEEE; Proceedings of ISSA585; pp. 1667-1670.
Noda Tsutomu
Sakamoto Toshiyuki
Shinkawa Keiro
Hitachi , Ltd.
Murrell Jeffrey S.
Powell Mark R.
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