Digital Transport Stream Capture by USB2
CapUSB allows capture of original MPEG2 Transport Stream from a variety of BS/CS and Terrestrial Digital tuners. With single chip USB bridge MPEG processor providing PID filtering, using USB2.0 High-Speed Bulk or Isochronous transfer mode, data rates up to 50Mbps are possible. Especially in case of 110CS broadcast, tuner clocks the signal at ~50Mbps, however the actual useful data rate is closer to 20 or 30Mbps, remaining data being null-PID (0x1fff). MPEG2 processor filters this null-PID before transmitting over USB, saving bandwidth. Signal is picked up from the NIM tuner, or in case of separate 8PSK demodulator chip, at the demod pins.
Transport stream transfer, B-CAS interface and MULTI2 decryption is handled by a software solution, only one B-CAS card is required - connected to a SmartCard reader, and not necessary for tuner operation.
last updated 2007/04/07