Signal

About: Signal is a research topic. Over the lifetime, 674211 publications have been published within this topic receiving 4570168 citations. The topic is also known as: electric signal.

Signal separation method and apparatus for restoring original signal from observed data

Abstract: The present invention provides methods and apparatus to stably separate and extract an original signal from multiple signals by a few calculation steps when multiple signals have been observed in a mixed state. In an example embodiment, signals are separated by introducing a function having a monotonously increasing characteristic like an exponential type function as a cost function, and applying an adaptive algorithm that minimizes that cost function in terms of a signal separation matrix. Then, an error signal e(t) is calculated based on y(t) formed by this nonlinear function, the estimated separation matrix W(t−1) estimated at the previous cycle, and the observed signal x(t) at that time. Then, based on the calculated error signal e(t), the update of the separation matrix W(t) at that time is performed such that consideration weight is increased when estimation errors are large using the cost function having a monotonously increasing characteristic.

Digitally controlled analog delay locked loop (DLL)

Abstract: An apparatus comprising an analog delay line and a control circuit. The analog delay line may be configured to generate an output signal in response to an input signal, a first control signal, and a second control signal. A phase of the output signal may be (i) coarsely adjustable with respect to the input signal in response to the first control signal and (ii) finely and continuously adjustable in response to the second control signal. The control circuit may be configured to generate the first and the second control signals in response to the input signal and the output signal.

Information processing system

Abstract: PURPOSE:To decrease the timing loss for synchronization and to improve the performance of the system in the information processing system having plural semiconductor integrated circuits by providing a phase lock loop circuit for outputting a clock signal of a multiple frequency with respect to an inputted clock signal CONSTITUTION:In each semiconductor integrated circuit 7 - 10, in addition to a function block circuit of a CPU, etc, a phase lock loop circuit (PLL) 5 is integrated In such a state, a clock signal supplied to the circuit 5 through a clock line 11 is inputted to a phase comparator 16, compared with an output of a frequency dividing circuit 15, and its output signal is inputted to a voltage control oscillator (VCO) 18 through an LPF 17 Subsequently, a clock signal 131 outputted from the VCO 18 is inputted to the circuit 15, subjected to frequency division in a frequency division ratio set by control information from the CPU 1, and inputted to the comparator 16 That is, each circuit 5 has the frequency dividing circuit in the inside, and also, can control freely its frequency division ratio, therefore, the frequency of an outputted clock signal can be set to a multiple frequency of a clock signal generated by a clock generating circuit 6 Accordingly, a timing loss for synchronization is decreased, and the performance of the system can be improved

Display device, drive circuit for the same, and driving method for the same

Abstract: In a signal line drive circuit of an active-matrix type liquid-crystal display which is a voltage-controlled type display with a capacitive load, n selector switches (161 to 16n) are provided between buffer circuits (151 to 15n) to which voltages responsive to an image to be displayed are inputted from reference voltage selection circuits (131 to 13n), and output terminals (T1 to Tn) to which are connected image signal lines. These selector switches (161 to 16n), based on a shorting control signal (Csh) that is at a high level when the polarity is reversed to perform AC drive of the liquid-crystal panel, switch the output signals (OUT1 to OUTn of the image signal line drive circuit between the output signals of the buffer circuits (151 to 15n) and the common electrode signal (Vcom). By doing this, each of the image signal lines is, for a prescribed time only when the polarity is reversed, separated from the buffer circuits (151 to 15n) and shorted to the common electrode. This configuration reduces the power consumption of the signal line drive circuit

Touch sensitive screen signal detection arrangement

Abstract: In certain situations it is necessary to detect a slight change in a continuous wave signal and to be able to specifically determine the exact position of the change. This is especially necessary in situations where a continuously changing signal (with respect to time) is generated and where it is necessary to determine, at a particular instant of time, any change in the signal from a previous corresponding instant of time. Where the signal is periodic in nature and substantially repeatable between cycles it is possible to establish a memory data base of signal levels as a function of time. Comparisons can then be made on successive cycle against the known, or precalculated data base. Changes between the data base and the new signal result give a positive signal change indication.