KeyStone Semiconductor Corp.
|KeyStone Semiconductor Corp. Patent applications|
|Patent application number||Title||Published|
|20140146920||MIXER WITH IQ GAIN-PHASE CALIBRATION CIRCUIT - A mixer with IQ gain-phase calibration circuit is provided, including an I-path input stage, a Q-path input stage, an I-path switching stage, a Q-path switching stage, and an output stage, wherein the output stage further includes a phase calibration module, and a gain calibration module. The I-path and Q-path input stages are to convert the input voltage signal to a current signal, and the I-path and Q-path switching stages are to perform computation on input signal from the input stages with local oscillation signal. The signals from the switching stages are then passed through the phase calibration module for phase calibration and then through the gain calibration module for gain calibration before outputting.||05-29-2014|
|20140117974||RSSI CIRCUIT WITH LOW VOLTAGE AND WIDE DETECTABLE POWER RANGE - An RSSI circuit with low voltage and wide detectable power range is provided, including a plurality of amplifiers connected in a cascade manner; a plurality of rectifiers, each of the plurality of rectifier having an input connected to an output of each of the plurality of amplifiers in turn; and a selector, connected to an output of each of the plurality of rectifiers for selecting an output among the outputs from the plurality of rectifiers. By using selector to select an output among outputs of the rectifiers, the RSSI circuit of the present invention can detect a wider power range with same voltage range because each stage can utilize the full voltage range.||05-01-2014|
|20140111259||POWER-ON RESET CIRCUIT - A power-on reset circuit includes a power confirmation module and a reset signal generator. The power confirmation module receives a supply voltage and generates a reference voltage and a comparison voltage. A magnitude of the reference voltage rises a first time delay after receipt of the supply voltage, and a magnitude of the comparison voltage rises a second time delay after receipt of the supply voltage. The second time delay is greater than the first time delay. The power confirmation module further outputs a confirmation signal based on the reference voltage and the comparison voltage. The reset signal generator outputs a reset signal according to the confirmation signal.||04-24-2014|
|20130191133||APPARATUS FOR AUDIO DATA PROCESSING AND METHOD THEREFOR - An apparatus for audio data processing and a method therefor are provided. The apparatus includes a processing unit and an audio decoder. The processing unit receives an audio data stream, and the audio data stream includes a first frame header that complies with a communication protocol and an audio data encoded in an audio compression format. The processing unit parses the audio data stream to split the first frame header and the audio data, generates at least one frame information according to the first frame header, and acquires a second frame header according to the frame information. Here, the second frame header complies with an international audio and video coding standard. The audio decoder is coupled to the processing unit, receives the second frame header and the audio data from the processing unit, and decompresses the audio data according to the second frame header.||07-25-2013|
|20130188682||APPARATUS FOR SYNCHRONIZATION OF AUDIO DATA AND VISUAL DATA AND METHOD THEREFOR - An apparatus for synchronizing audio data and visual data and a method therefor are provided. The apparatus includes a splitter, a synchronization unit coupled to the splitter, an audio control unit coupled to the splitter and the synchronization unit, and a visual data processing unit coupled to the splitter and the synchronization unit. The splitter receives an application layer data frame including audio data and visual data and splits the visual data from the audio data. The synchronization unit receives audio timing information of the audio data and acquires synchronization information according to the audio timing information and external timing information. The audio control unit receives and temporarily stores the audio data and outputs the audio data according to the synchronization information. The visual data processing unit analyzes and temporarily stores the visual data and outputs the visual data together with the audio data according to the synchronization information.||07-25-2013|
|20120226581||SHOPPING INFORMATION FLOW SYSTEM AND METHOD BY DIGITAL RADIO CHANNEL AND COMMUNICATION NETWORK - A shopping information flow system and method by a digital radio channel and a communication network are provided, and are suitable for an electronic device with a playing digital broadcasting function. The method includes the following steps: a digital radio broadcasting station broadcasting a program signal and a sales information, in which a virtual store providing the sales information on a commodity; the electronic device receiving and playing the program signal, and displaying the sales information; the electronic device starting a web link to connect an authentication terminal, transmitting an identification information of the electronic device for processing a transaction identification; and the authentication terminal processing a sale deal of the commodity, thereby noticing the virtual store to supply the commodity to a user of the electronic device. This can be done to sell the commodity.||09-06-2012|
|20120224698||WIRELESS AUDIO FREQUENCY PLAYING APPARATUS AND WIRELESS PLAYING SYSTEM USING THE SAME - A wireless audio frequency playing apparatus and a wireless playing system using the same are provided. The wireless playing system includes a wireless remote controller and the wireless audio frequency playing apparatus. The wireless audio frequency playing apparatus is operated under control of the wireless remote controller.||09-06-2012|
|20120183109||WORLD DIGITAL RADIO RECEIVER WITH IMAGE SIGNAL REJECTION - A broadcast receiver with image rejection is proposed. The broadcast receiver includes a radio frequency processing unit and a baseband processing unit. The radio frequency processing unit receives a first input signal and a second input signal, amplifies the first input signal and the second input signal, down-converts the second input signal, and generating a first signal and a down-converted second signal. Besides, the baseband processing unit receives one of the first signal and the down-converted second signal, filters the received signal thereof, wherein the baseband processing unit comprises an anti-aliasing filter unit which attenuates adjacent channel interference of the received signal, and when the received signal is the down-converted second signal, the anti-aliasing filter unit attenuates a portion of an image signal in the received signal.||07-19-2012|
Patent applications by KeyStone Semiconductor Corp.