US 12,009,787 B2
Signal down-conversion
Wilfred Edwin Booij, Oslo (NO); and Elad Shabtai, Oslo (NO)
Assigned to Sonitor Technologies AS, Oslo (NO)
Appl. No. 17/761,883
Filed by Sonitor Technologies AS, Oslo (NO)
PCT Filed Sep. 16, 2020, PCT No. PCT/GB2020/052237
§ 371(c)(1), (2) Date Mar. 18, 2022,
PCT Pub. No. WO2021/053332, PCT Pub. Date Mar. 25, 2021.
Claims priority of application No. 1913604 (GB), filed on Sep. 20, 2019.
Prior Publication US 2022/0337193 A1, Oct. 20, 2022
Int. Cl. H03D 7/16 (2006.01); G01S 5/26 (2006.01); G01S 7/526 (2006.01); H03M 1/12 (2006.01); H03M 3/00 (2006.01); H04L 27/14 (2006.01)
CPC H03D 7/165 (2013.01) [G01S 5/26 (2013.01); G01S 7/526 (2013.01); H03M 1/124 (2013.01); H03M 3/462 (2013.01); H03D 2200/0062 (2013.01); H04L 27/14 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A method of down-converting a sampled signal, the method comprising:
receiving input samples, representative of a signal, having an initial sampling rate; and
applying a mixing-and-combining operation to each of a succession of sub-sequences of the input samples to generate a sequence of output samples having an output rate lower than the initial sampling rate, wherein the sub-sequences of the input samples are spaced at intervals that correspond to the output rate, and wherein the mixing-and-combining operation generates a respective output sample from each sub-sequence wherein the output sample depends on a set of products of the input samples of the sub-sequence with respective values derived from a periodic mixing signal having a mixing frequency.