ISDB-Tmm 调制标准.docx

ISDB-Tmm 调制标准 ISDB-Tmm is an extension to ISDB-T for terrestrial mobile broadcasting. It allows up to 33 segments concatenated without guard band. Receivers tune to a sub-band of the full signal. ISDB- TMM标准是ISDB-T在地面移动广播的一个扩展。它允许多达33段串连无保护带。接收机调谐到全部信号的一个子波段 ISDB-Tmm is available as a modulation option for all DekTec VHF/UHF modulators. The maximum bandwidth is 8Mhz, except on the DTA-2111 and the new DTA-2115, which support the full 14.5MHz bandwidth required for 33-segment ISDB-Tmm. ISDB- TMM可作为DekTec VHF / UHF所有调制器的调制选项。最大带宽为8MHz ，除此之外，DTA- 2111和新的DTA -2115 ，它支持33段ISDB - TMM所需的完整14.5MHz带宽。33-segment ISDB-Tmm modulation with the DTA-2111ISDB-Tmm(Terrestrial mobile multi-media) is a mobile broadcasting system based on ISDB-T technology. ISDB-Tmm allows any combination of 13-segment (Type A, ISDB-T compliant) and 1-segment (Type B, ISDB-Tsb compliant) signals, up to maximum of 33 segments (bandwidth 14.5MHz). No guard band is used, for a very efficient usage of the spectrum.The figure below shows a possible ISDB-Tmm segment arrangement:TheDTA-2111VHF/UHF modulator card supports a maximum bandiwdth of 16MHz. With the new ISDB-Tmm option, this enables real-time generation of ISDB-Tmm signals up to 14.5MHz bandwidth. You can create your own real-time ISDB-Tmm application using DekTecs SDK (DTAPI): This allows you to configure the ISDB-Tmm modulation parameters in any way you want.In addition, the ISDB-Tmm option includes a license for theTmmXpressapplication, an ISDB-Tmm test-signal generator. The intuitive and easy to use graphical user interface lets you create any combination of 13-, 3- and 1-segments up to a total of 33 segments. You can also configure the signal parameters, select input transport stream files, add noise, add multipath fading and generate either an ISDB-Tmm, -TSB or -T signal.The TmmXpress is ideal for use as an ISDB-Tmm signal generator in your