Patent ID: 6163787
Filing Date: 2000-12-19
Classification: H03H

Abstract:
A device for reducing the data rate of a data sequence (d1), comprising:a switchable filter device (1) which delivers first output values (dn) after a sampling intervals in a first state and second output values (dm) after a+1 sampling intervals in a second state, and has at least one tracking data window (dw; dw1, dw2) for forming filtered data values (df'; df', df""), whereinif only one tracking data window (dw) is present, this data window (dw) is assigned at least two different window sizes (dwf1, dwf2) whose selection is dependent on the sequence of the first (dn) and second output values (dm), and,if more than one tracking data window (dw1, dw2) are present, these are assigned at least two different window sizes (dwf1, dwf2), and the selection of the respective data window (dw1, dw2) with the associated window size is dependent on the sequence of the first (dn) and second output values (dm), andone (dwf1) of the window sizes (dwf1, dwf2) comprises b samples, and the other (dwf2) c samples, with b.gtoreq.a and c.gtoreq.a+1; anda control device (10) which is coupled to the switchable filter device (1) and, by means of the first and second states, causes the formation of n first output values (dn) and m second output values (dm) as well as the selection of the associated window sizes (dwf1, dwf2) or data windows (dw1, dw2) within equally long time periods (I2) of the data sequence d1, the number of n first (dn) and m second output values (dm) being determined by a rule r=a+m/(n+m), where r is a data rate reduction factor.