Several embodiments of an efficient tone mapping of high bit depth video to low bit depth displays are disclosed. A prediction is made as to whether margin can be obtained from the positive slack paths by performing additional timing optimization on the positive slack paths, and it is determined whether that margin is sufficient to reduce the timing violation to at least a desired level. Also provided is a method of increasing the libido by administering an effective amount of composition including an aphrodisiac and a compound to increase blood flow to the pelvic area in a pharmaceutically acceptable carrier. As the operating state determining circuit used is a noise amount detection circuit, an operation completion detecting circuit, or a potential fluctuation detecting circuit. The impedance sensing also is used for determination of arrhythmias or progression of heart failure. Video signal data intermediate to such processing, or the processed video signal being provided to the local display can be communicated to the remote user.