Abstract: In one embodiment, a gateway between a variable delay network and a constant delay network receives over the variable delay network a plurality of data streams to be multiplexed over a modulated channel extending through the constant delay network. A first processing component of the gateway generates command-packet-descriptors corresponding to content packets included in the received data streams. A second processing component of the gateway uses transmit time indications included in the command-packet-descriptors to schedule transmission of modulated packets representing the received data streams over the modulated channel.

Abstract: In one embodiment, a gateway for a constant delay network identifies a baseband clock that is synchronized by exchanging synchronization messages over a packet switched network. The gateway then generates a strobe by manipulating the identified baseband clock using a custom multiplier that is selected according to transmission variables. The gateway then signals a front end component to process fixed length packets for transfer to a back end component according to the generated strobe, which can reduce or eliminate buffering by the back end component and can improve cable modem operation.

Abstract: The present invention addresses the issue of jitter compounded by clock drifting in streaming media applications. In addressing jitter, the present invention attempts to recover the desired (de-jittered) arrival time at a gateway even if there is a frequency difference between the clocks of the original media source and the gateway. The desired arrival time is used with the addition of a constant to schedule the packet delivery time for delivery to a user via a network. Each packet arriving at the gateway contains an arrival timestamp. Using packets, which also contain sending time stamps, the invention determines the delivery time for each packet.

Abstract: Methods and apparatus are provided for selecting a cut-off index to filter transform coefficients associated with an input bitstream to provide filtered transform coefficients associated with a rescaled output bitstream. An arrangement of transform coefficients associated with an input data sequence (e.g. an audio segment or a video image block) is filtered using a cut-off index to provide modified transform coefficients associated with a modified output data sequence. Information including information about the input data sequence and the modified output data sequence can be used to update the filter cut-off index for reduction of future data sequences.