摘要:
A level detector 2 detects variation of the amplitude of an input signal a to output a level signal b representing HIGH or LOW in order to define the head portion of the input circuit a. A time constant control signal 3 generates a time constant control signal c based on the level signal b to control a time constant of an estimator 4 so as to make the time constant small for a prescribed period from a time when the level signal b varies from HIGH to LOW. The estimator 4 estimates DC offset included in the input signal a with the a time constant variation according to the time constant control signal c to output an estimate d. A compensator 1 subtracts the estimate d from the input signal a to obtain a compensation output. Therefore, in the estimator 4, the speed of estimating the DC offset is different between a period corresponding to the head portion of the input signal a and other periods. Thus, a DC offset compensation device can be configured to be capable of fast DC offset compensation at the head portion of the input signal a and stable DC offset compensation at the other portions.
摘要:
A signal adding device and a differential signal detecting device, wherein the signal adding device adds n input signals using n A/D converters, a selector and a lowpass filter. The n input signals are sampled in sequence by the A/D converter and digitized. Each digitized data is time-division multiplexed by the selector and input to the lowpass filter. The output of the lowpass filter is equal to an added signal of n input signals. The differential signal detecting device detects from inphase and quadrature-phase baseband signals the sine and cosine components of a phase difference at two instants of the phase-modulated signal. Two A/D converters digitize and convert the inphase and quadrature-phase baseband signals to inphase data and quadrature-phase data at predetermined intervals. A cosine component calculating unit calculates the cosine component by alternately selecting the inphase data and the quadrature-phase data. Similarly, a sine component calculating unit calculates the sine component by alternately selecting the inphase data and the quadrature-phase data. Two selectors select either the inphase data or the quadrature-phase data at predetermined intervals. By alternately selecting the inphase data and quadrature-phase data, and then multiplying the results, differential detection can be achieved with fewer multipliers and adders than the prior art differential detecting devices.
摘要:
A source device transmits an output format notify message for video data to a sink device before transmitting the video data to the sink device, the output format notify message including a 3D field storing data for identifying whether the video data to be transmitted is two-dimensional video data or three-dimensional video data transmitted using frame packing. In response to this, the sink device identifies a type and a format structure of the video data, and decodes the received video data based on the identified type and format structure of the video data.
摘要:
A sink device transmits a video information message to the source device, the video information message including video format information identifiers for identifying video formats supported by the sink device, which are selected from among a plurality of video format information identifiers for identifying video formats each including a resolution of the video data and a type of the video data, and a three-dimensional transmission method for three-dimensional video data when the type of the video data is the three-dimensional video data including first and second video frame data.
摘要:
A sink device wirelessly transmits a device capability response message to a source device. The device capability response message includes a video information message including at least one video format identification code (VIC) for identifying a video format of video data, which the sink device can display, and a coded video information message including compressing parameters for compressing video data. The VIC includes a VIC for 4k2k video data having 3840 or 4096 effective horizontal pixels and 2160 effective vertical pixels.
摘要:
In a wireless communication system including a source device and a sink device for wirelessly transmitting and receiving a CEC message specified in an HDMI standard, a CEC controller of the source device generates and outputs a CEC frame including the CEC message. A controller generates a wireless data packet including the CEC message in the generated CEC frame. A wireless transceiver circuit wirelessly transmits a wireless signal including the generated wireless data packet to the sink device, and receives a wireless signal including a wireless ACK packet and wirelessly transmitted from the sink device in response to the wireless data packet in the wirelessly-transmitted wireless signal.
摘要:
The device includes a cable interface module having a diplexer that outputs a first signal input from a first connector part connected to a cable television network to a third connector part and outputs a second signal input from a second connector part to a first connector part; a video tuner module having a distributor that branches a first signal input from a fourth connector part having a shape capable of connecting to the cable television network and connected to a third connector part and outputs to a fifth connector part, and inputs the other branched signal into a video tuner; and a communication tuner that selects another channel of the signal output from a fifth connector part.
摘要:
In a wireless communication system including a source device and a sink device for wirelessly transmitting and receiving a CEC message specified in an HDMI standard, a CEC controller of the source device generates and outputs a CEC frame including the CEC message. A controller generates a wireless data packet including the CEC message in the generated CEC frame. A wireless transceiver circuit wirelessly transmits a wireless signal including the generated wireless data packet to the sink device, and receives a wireless signal including a wireless ACK packet and wirelessly transmitted from the sink device in response to the wireless data packet in the wirelessly-transmitted wireless signal.
摘要:
A source device combines right-eye video frame data with left-eye video frame data into combined video frame data every video frame. Then, the source device generates a plurality of packets by dividing the combined video frame data into packets so as to insert information on a horizontal position for a horizontal display time interval and information on a vertical position for a vertical display time interval of a first pixel of the combined video frame data stored in the packets, into a header of each packet for transmitting the combined video frame data, as information for identifying right-eye video frame data and left-eye video frame data.
摘要:
A communication system includes communication devices; a switch device having coaxial terminal units to which the communication device are connected, a switch unit of entirely or individually connecting the coaxial terminal units, and a switch control unit of controlling the connection status of the switch unit; and a transmittal right control device. The transmittal right control device is connected to the terminal, and manages the connection status of the switch unit, receives from the communication devices requests for time for communication with other communication devices, determines assignment of time for communications between the communication devices, notifies the communication devices of the assignment, and instructs the switch control unit not to make signals interfere among the communication devices in different combinations for communications in the same time period.