Related Equipments for Digital TV (DTV)

  This equipment is Digital Terrestrial Broadcasting transmitting equipment and is based upon the C/N reset equipment specification prescribed by the common specification(Orange Book).

  The wave path distortion such as the co-channel interference, the multipath interference and the C/N degradation which occurred by wave path from the previous station is reduced and equivalent C/N is improved by combining with a OFDM modulator.

  This equipment extracts the identifying signal (Network_ID and AC_ID) which is included in a received ISDB-T signal out and verificates, and outputs information for operation control of a relay station transmitter.

  When the same signal as designated identifying signal received an included broadcast wave, the information on output permission is output. When a different signal is included, the information on output inhibition is output.

  This equipment have a measuring function of C/N of the weak layer, equivalent C/N and simple BER, so when exceeding the set reach of the threshold, it's possible to do the outside alarm output at the same time as the signal quality is estimated.

  It was developed in conjunction with NHK.

  This equipment measures equivalent C/N of designation channel in UHF band or IF signal is performed, and when exceeding the reach of the threshold set beforehand, outputs the alarm signal.

  At most 2 of measuring system can be mounted in the case (Height: 50mm).

This equipment receives 2 wave of Digital Terrestrial Broadcasting, monitors the parameter of two waves, "Frame sync, reception C/N, BER(*) of each hierarchy, the TS signal, and EWS" at the same time, and outputs each state of the wave from point of contact and LAN.The numerical data of each monitored item is output by LAN function.

Moreover, the reception channel, the threshold of warning, and the noise adding equipment can be controlled. For 2 reception units are mounted, IF signal or RF signal (corresponds to UHF all channels) are receipted.

*BER (Bit error rate)

This equipment is a system that transmits audio and data by using the AC signal of Digital Terrestrial Broadcasting.

The codec encodes audio signals (2 lines or 1 line), multiplexes data signal input by the personal computer through LAN, outputs AC signal that synchronizes with frame synchronous signal, symbolic synchronized signal, and sampling clock of AC multiplexer (other companies product and separately purchase).

At receiving point, AC receiver that corresponds to UHF all channels receives OFDM modulated signal of Digital Terrestrial Broadcasting, demodulates and outputs audio signals (2 lines or 1 line) and data signal from AC signal that is demodulated by AC carrier demodulator.

It was developed in conjunction with NIPPON TELEVISION NETWORK CORPORATION.

The interface a part of NSI-AC Multiplexer was develops by guidance of NHK.