Abstract: This invention relates to a method and system for changing an output rate of information for a buffer (3) with a constant first output rate (R1) which receives output data from a data source (2a), where the method step comprises; halting the reception of output data from the data source (2a); outputting (4) the stored output data of the buffer (3) at the first output rate (R1) until said buffer is empty, and resuming receiving and storing of output data in the buffer (3); setting a second constant output rate (R2) as the output rate of the buffer; and commencing/starting output of the content of the buffer at the second output rate (R2) when the amount of buffered data is equal to the second constant output rate (R2) times a requested buffer-time (TB2).

Abstract: This invention relates to a method and system for changing an output rate of information for a buffer (3) with a constant first output rate (R1) which receives output data from a data source (2a), where the method step comprises; halting the reception of output data from the data source (2a); outputting (4) the stored output data of the buffer (3) at the first output rate (R1) until said buffer is empty, and resuming receiving and storing of output data in the buffer (3); setting a second constant output rate (R2) as the output rate of the buffer; and commencing/starting output of the content of the buffer at the second output rate (R2) when the amount of buffered data is equal to the second constant output rate (R2) times a requested buffer-time (TB2).

Abstract: This invention relates to a method and a system for executing processes with different priorities in a multiprocessing environment comprising execution of a low priority process and a high priority process where the high priority process and the low priority process (T1) share a given resource, the method comprising the step of: raising the effective priority of the low priority process when the low priority process is going to use the shared resource, where the effective priority is raised to above other processes in the multiprocessing environment. This allows for as short delay, by other processes, of the high priority process as possible.

Abstract: A method and device are disclosed for calculating estimated time stamps ìt in video distribution apparatus, MPEG-2 program encoders, multiplexers, splicers. True times Yt of a data packet number t having the linear form: Yt=Yt−1+&bgr;t, &bgr;t=&bgr;t−1+&eegr;t, with &eegr;t being a small perturbation relative to the linear relation between time and packet number. The true times of data packet number t are observed as: ot=Yt+&egr;t, where &egr;t is an observational error. The estimated time stamps are produced according to: ìt=ìt−1+&bgr;t and such that the value of &bgr;t is made dependent on the exceeding by #ot−ìt−1−&bgr;t−1 # of max[&egr;t]. The results are accurate and smooth estimated time stamps.

Abstract: A digital Phase Locked Loop (PLL) comprises a Voltage Controlled Oscillator (VCO) and a phase detector. The output of the VCO is coupled to a first input of the phase detector whose output is coupled to the input of the VCO by way of a low-pass filter. A second input of the phase detector is coupled to the output of a digital oscillator. The time constant of the low-pass filter determines the time necessary for the PLL to respond to frequency changes of the signal of the digital oscillator, and is therefore preferably made smallest possible. The lower boundary of the time constant is determined by the smallest possible frequency change of the digital oscillator signal. If the smallest possible frequency change is very small, the PLL will generally become too slow because the time constant is too large.