摘要:
A module board has a configuration in which a first circuit board, a first composite sheet, a second circuit board, a second composite sheet, and a third circuit board are laminated in this order. Inspection terminals are arranged in a matrix shape in a predetermined region on an upper surface of the third circuit board. Electronic components are mounted on the first and second circuit boards. The inspection terminals are electrically connected to the electronic components mounted on the first and second circuit boards through vias and wiring patterns.
摘要:
A circuit module for a digital television receiver is formed by multi-layering a decoder LSI including a CPU and a decoder, a decoder layer substrate including a CA interface circuit, a demodulation function layer substrate including a demodulator, and an extension function layer substrate including a communication controller. The demodulation function layer substrate and the extension function layer substrate can be selectively multi-layered to the decoder layer substrate in response to a broadcasting system of a digital television signal or a type of a CA module.
摘要:
An optical transmission system accomplishes optical transmission over a long distance by combining a multiplexing line terminal with optical amplifiers, linear repeaters, and regenerators with optical amplifiers combined together. The system also accomplishes the optical transmission over a short distance by directly connecting the linear terminals therebetween, with an electric-to-optic converter replaced by an electric-to-optic converter having a semiconductor amplifier, with an optic-toelectric converter by an optic-to-electric converter having an avalanche photodiode as light receiver, and with no use of any optical booster amplifier and optical preamplifier in multiplexing line terminal. With these, the optical transmission system can be easily constructed depending on the transmission distance required.
摘要:
A reception system has a receiving section which receives a transport stream transmitted from a transmission system that produces and transmits the transport stream, the transport stream being produced by multiplexing compression coded contents of a program, and electronic program guide information including program specific information having at least an NIT, a PAT, and a PMT, and service information having at least an SDT and an EIT; a PID designating section which can designate a PID of a packet other than an NIT packet in the electronic program guide information, as a PID of a replace packet (hereinafter, referred to as replace PID); a replace PID storing device which stores the replace PID; an SIT producing section which produces an SIT packet from the service information in the received transport stream; and a packet extracting and replacing section which can replace a replace packet indicated by said replace PID storing device, and the NIT packet with the SIT packet.
摘要:
A DTV module includes a CPU, a decoder, and a CA interface circuit. The decoder executes a decoding processing on a digital television signal inputted from a demodulator provided on a motherboard, so as to decode the digital television signal into a video signal and an audio signal, and outputs the video signal and audio signal. The CA interface circuit is connected to a CA module via a PC card socket, and executes input and output processings on signals communicated among the demodulator, CA module, decoder, and CPU. The CPU controls the CA interface circuit by switching types of the signals, so that a selected type of signal conforms to a type of the CA module, in response to a broadcasting system of a digital television signal or the type of the connected CA module.
摘要:
An optical transmission system accomplishes optical transmission over a long distance by combining a multiplexing line terminal with optical amplifiers, linear repeaters, and regenerators with optical amplifiers combined together. The system also accomplishes the optical transmission over a short distance by directly connecting the linear terminals therebetween, with an electric-to-optic converter replaced by an electric-to-optic converter having a semiconductor amplifier, with an optic-toelectric converter by an optic-to-electric converter having an avalanche photodiode as light receiver, and with no use of any optical booster amplifier and optical preamplifier in multiplexing line terminal. With these, the optical transmission system can be easily constructed depending on the transmission distance required.
摘要:
An optical transmission system accomplishes optical transmission over a long distance by combining a multiplexing line terminal with optical amplifiers, linear repeaters, and regenerators with optical amplifiers combined together. The system also accomplishes the optical transmission over a short distance by directly connecting the linear terminals therebetween, with an electric-to-optic converter replaced by an electric-to-optic converter having a semiconductor amplifier, with an optic-toelectric converter by an optic-to-electric converter having an avalanche photodiode as light receiver, and with no use of any optical booster amplifier and optical preamplifier in multiplexing line terminal. With these, the optical transmission system can be easily constructed depending on the transmission distance required.
摘要:
A reception system has a receiving section which receives a transport stream transmitted from a transmission system that produces and transmits the transport stream, the transport stream being produced by multiplexing compression coded contents of a program, and electronic program guide information including program specific information having at least an NIT, a PAT, and a PMT, and service information having at least an SDT and an EIT; a PID designating section which can designate a PID of a packet other than an NIT packet in the electronic program guide information, as a PID of a replace packet (hereinafter, referred to as replace PID); a replace PID storing device which stores the replace PID; an SIT producing section which produces an SIT packet from the service information in the received transport stream; and a packet extracting and replacing section which can replace a replace packet indicated by said replace PID storing device, and the NIT packet with the SIT packet.
摘要:
A router apparatus 5 is provided with an ATM switch, an IP controller for performing routing control as a controller for layer 3, plural kinds of interfaces which are individually provided to plural transmission paths in which various communications are performed, and a cell multiplexing/demultiplexing unit, and manages the cell communications between respective parts on the basis of identification information. The input packet is subjected to IP processing in an interface to be converted to a cell in a common format, and the cell is serially multiplexed with a cell from another interface on a cell basis, and transmitted to the ATM switch at the cell multiplexing/demultiplexing unit. Each interface and each cell multiplexing/demultiplexing unit sets and switches the identification information for the header portion of the packet and the cell to be communicated by using a table in which the corresponding relationship of the identification information is registered.
摘要:
An optical transmission system accomplishes optical transmission over a long distance by combining a multiplexing line terminal with optical amplifiers, linear repeaters, and regenerators with optical amplifiers combined together. The system also accomplishes the optical transmission over a short distance by directly connecting the linear terminals therebetween, with an electric-to-optic converter replaced by an electric-to-optic converter having a semiconductor amplifier, with an optic-to-electric converter by an optic-to-electric converter having an avalanche photodiode as light receiver, and with no use of any optical booster amplifier and optical preamplifier in the multiplexing line terminal. With these, the optical transmission system can be easily constructed depending on the transmission distance required.