Abstract: An apparatus comprises means (31) for receiving a broadcast TS (transport stream) and detecting layer information in each broadcast TS packet, means (32) for delaying the broadcast TS, means (37) for inputting an MPEG-TS for rewriting, means (33) for generating a signal for selecting a delayed broadcast TS packet when the layer information does not indicate a predetermined layer, and generating a signal for selecting an MPEG-TS packet for rewriting when the layer information indicates the predetermined layer, and means (38) for selectively outputting the delayed broadcast TS packet and the MPEG-TS packet for rewriting. The apparatus may further comprise means (34) for modifying a PAT packet of the broadcast TS, and means (35) for modifying an NIT packet of the broadcast TS, where the apparatus can selectively output the modified PAT packet and modified NIT packet.

Abstract: An optical power measuring apparatus for measuring a power level of an optical signal comprised of a light intensity modulated signal, received by a light receiving element is provided. In the apparatus, a first signal path including a first voltage detection circuit and a first amplifier circuit supplies a processor with a first signal having a voltage proportional to a current flowing through a light receiving element (PD), and a second path including a TIA, a DC detection circuit and a second amplifier circuit supply the processor with a second signal. The second signal corresponding to an envelope of a voltage from the TIA.