摘要:
Provided is an optical pointing system. The optical pointing system has an image sensing unit for receiving light and generating a plurality of first analog signals corresponding to a quantity of the received light in response to a reset signal and a pixel selection signal, at least one pixel for shutter control for receiving light, each of the pixel for shutter control generates a second analog signal corresponding to a quantity of the received light, a first comparator for comparing voltages of the plurality of first analog signals to generate a first comparison digital signal in response to a shutter control signal, an image processor for receiving the first comparison digital signal to calculate a movement value of the optical pointing system, and a shutter control unit for generating the shutter control signal based on the at least second analog signal.
摘要:
There is provided a mute control circuit which is simplified to efficiently remove switching noise during the muting of each output and reducing the number of connection pins required for a given integrated circuit. The mute control circuit includes a pulse generator for receiving the each mute signal and generating a control pulse; a charge/discharge signal generator for receiving the control pulse and generating a charge/discharge signal and a switching control signal; a controller for receiving the charge/discharge signal and controlling the mute operation of the output terminal according to the switching control signal; and a switching signal generator for receiving the mute signal, generating a switching signal according to the switching control signal of the charge/discharge signal generator, and supplying the switching signal to the controller.
摘要:
A stereo and dual audio signal identifying system comprising, an FM detector, bandpass filter, and AM detector which generate a filter/detected input to a first PLL having a 210 Hz reference signal. The first PLL generates a first input to a comparator and a second PLL generates a second input to the comparator. The comparator generates an output signal indicative of the presence of stereo and dual audio signals.
摘要:
In a noise reduction circuit with a main signal path and an auxiliary signal path having a high-pass filter characteristic, the noise reduction circuit comprises: a voltage-to-current converting circuit having a differential input and output and connecting the auxiliary signal path to the main signal path, PN junction transistors connected to the differential output of the voltage-to-current converting circuit, a paired common-emitter transistor arrangement having one base electrode connected to the PN junction transistors, a capacitance connected to a first differential input of the voltage-to-current converting circuit, a feedback resistor connecting a collector of a first common-emitter transistor pair of the paired common-emitter transistor arrangement to the first differential input of the voltage-to-current converting circuit, a voltage buffer having the collector of the first common-emitter transistor pair of the paired common-emitter transistor arrangement and a voltage dividing resistance connected to a first differential input terminal, and an operational circuit for summing the auxiliary signal and main signal outputs. Accordingly, the circuit can minimize the layout area of an integrated circuit.
摘要:
A noise reduction circuit includes a main signal path and an auxiliary signal path having a high-pass filter characteristic. The noise reduction circuit may be used as a compression circuit or an expansion circuit in conjunction with a transmitter or a receiver, respectively. The auxiliary signal path includes a voltage dividing circuit, a voltage-to-current coverting circuit; a differential amplifier, and a voltage buffer connected between an input terminal and an operational amplifier. The main signal path is constituted by a resistance connected between the input terminal and the operational amplifier. The noise reduction circuit improves precision by eliminating the influence of absolute value variation of resistance which can occur in integrated circuit fabrication.
摘要:
A touch sensor device is provided. The touch sensor device includes a touch panel including a plurality of touch mark-keys indicating a position touched by a touch object, a plurality of first touch pads disposed at positions corresponding to the plurality of touch mark-keys of the touch panel and generating touch information of the touch object as a first electrical signal, a plurality of second touch pads disposed between the plurality of first touch pads and generating touch information of a conductive material on the touch object as a second electrical signal, and a touch sensing unit receiving the first electrical signal, outputting a plurality of sensing signals to allow an electronic device to perform predetermined operations corresponding to the touched touch mark-keys, and determining whether the touch of the touch object is a normal one using the first and second electrical signals.
摘要:
A touch panel device and a method for detecting a contact position are provided. The touch panel device includes a touch panel including a first touch pattern, the first touch pattern having a plurality of first touch pads connected in series; and a touch sensor for applying a clock signal to one terminal of the first touch pattern, receiving a first delayed clock signal from the other terminal of the first touch pattern, and generating contact position data corresponding to a contact position of an object using a difference in delay time between the clock signal and the first delayed clock signal. Thus, since the plurality of touch pads are connected in series, the contact position of the entire touch panel can be sensed with only one touch sensor, and the touch pad has a greater area than the connection line for a distinguished difference in resistance between the touch pad and the connection line, such that the contact position can be accurately detected.
摘要:
Provided are a delay time measurement circuit and method. Since the delay time measurement circuit and method according to the present invention use a delay chain having a feedback structure, a measurable delay time is not limited. In addition, the number of delay elements constituting the delay chain can be reduced, such that the delay time measurement circuit can be implemented in a small layout area.
摘要:
An optical pointing device and a method of adjusting an exposure time and a comparison voltage range of the optical pointing device are provided. The optical pointing device obtains a high-resolution image using a low-resolution analog-to-digital (A/D) converter, and calculates a movement value using the obtained image. Thus, the optical pointing device can calculate an accurate movement value, reduce production cost, and provide a rapid operating speed and low power consumption. Further, the optical pointing device can use the A/D converter having a relatively low signal-to-noise ratio of an input signal.
摘要:
Provided is an image sensor and optical pointing system using the same. The image sensor has a plurality of pixels, each pixel including a photocell for receiving light and generating an analog signal having a voltage corresponding to a quantity of the received light, a comparator for, in response to a shutter control signal, comparing the analog signal of the photocell with an analog signal of an adjacent pixel to generate a digital signal for movement calculation, or comparing the analog signal of the photocell with a reference voltage to generate a digital signal for shutter control, and a switch for transferring the digital signal for movement calculation and the digital signal for shutter control in response to a pixel selection signal. The optical pointing system includes a reference voltage generation unit for generating a reference voltage, the image sensor, a signal selector for receiving the digital signal for movement calculation and the digital signal for shutter control, and selecting and outputting one of the digital signal for movement calculation and the digital signal for shutter control in response to a shutter control period selection signal, a movement calculation and shutter control unit for receiving the digital signal for movement calculation to obtain an image of an object and output a movement value of the optical pointing system and the shutter control period selection signal, and receiving the digital signal for shutter control to compare a high-level count value with a maximum count value and a minimum count value and output the shutter control signal.