Abstract: A single decryption engine is used for decrypting a plurality of encrypted transport streams. Packets in each of the plurality of encrypted transport streams are tagged with a tag value to indicate their origin stream. The tagged packets from the plurality of encrypted transport streams are merged into a merged transport stream. The packets in the merged transport stream are decrypted with the decryption engine to produce a decrypted merged transport stream. The decrypted merged transport stream is split into a plurality of decrypted transport streams, equal in number to the plurality of encrypted transport streams, by routing packets in the decrypted merged transport stream to specific decrypted transport streams according to their tag value. A null-packet padding technique, a gapped-clock technique and a multi-port static RAM controller technique are disclosed.

Abstract: A single decryption engine is used for decrypting a plurality of encrypted transport streams. Packets in each of the plurality of encrypted transport streams are tagged with a tag value to indicate their origin stream. The tagged packets from the plurality of encrypted transport streams are merged into a merged transport stream. The packets in the merged transport stream are decrypted with the decryption engine to produce a decrypted merged transport stream. The decrypted merged transport stream is split into a plurality of decrypted transport streams, equal in number to the plurality of encrypted transport streams, by routing packets in the decrypted merged transport stream to specific decrypted transport streams according to their tag value. A null-packet padding technique, a gapped-clock technique and a multi-port static RAM controller technique are disclosed.

Abstract: An electronic ballast includes an AC to DC converter for power factor correction, a bulk capacitor for storing energy from the converter, and a microprocessor controlled, half-bridge inverter including a series resonant, direct coupled output. Input ports of the microprocessor are coupled to several locations within the ballast to monitor the operation of the ballast or the operation of a gas discharge lamp coupled to the ballast. An analog voltage limiter overrides the microprocessor to limit output voltage under fault conditions. A storage capacitor, connected in series with the bulk capacitor, stores energy at low voltage for powering the microprocessor. The microprocessor is programmed to provide lamp protection features, lumen maintenance, and a warm-up period for a lamp. The microprocessor is also programmed to meet the operating requirements of world markets and of different lamp types.