Abstract: Briefly, in accordance with one embodiment of the invention, a portable computing or communication device may include an application subsystem coupled to a wireless subsystem with an interface. The interface may provide isolation between the application subsystem and the wireless subsystem.

Abstract: Briefly, in accordance with one embodiment of the invention, a portable computing device includes a modem that may operate independently from a main processor. The modem may be used to download communication data while the main processor is inactive or powered off.

Abstract: A motion adaptive television signal processing system is disclosed. An image change estimator estimates the image change over an image time interval. A television signal processor adaptively processes the signal in response to a control signal. A control signal generator is coupled between the image change estimator and the adaptive television signal processor. The control signal generated exhibits a function substantially described by: K=Ae.sup.-b/x where K is the value of the control signal, A is the maximum value the control signal can attain, x is the estimated image change, and b is a constant. In a second embodiment, a second estimator estimates a parameter of the television signal. The relationship of the control signal to the estimated image change is varied as a function of the estimated parameter.

Abstract: A variable gain control system for a digital signal is provided in which the digital signal addresses a digital memory to produce an output signal representative of the addressing signal modified by a transfer characteristic. A control word M is repetitively loaded into an M counter, which counts to a predetermined limit to produce output pulses when the limit is reached. The output pulses increment a data counter. Concurrently, an N control word is repetitively loaded into an N counter, which also counts to a predetermined limit to produce output pulses when that limit is reached. The output pulses of the N counter increment an address counter. When the count of the address counter changes, the current value of the data counter is loaded into a digital memory at the address provided by the address counter. The memory is loaded in this manner to store a data array representative of a signal gain related to the ratio of the N to M.