A beverage preparation
system comprising: (i) a
capsule (1 1) with side (16), bottom (18) and top (14) walls, said
capsule having a shape that is substantially symmetrical around a
vertical axis, and said
capsule is suitable for containing a beverage preparation ingredient to be dissolved, and / or infused, and / or extracted under pressure, by action of a fluid circulating into said capsule through said ingredient, (ii) a beverage preparation
machine (1) suitable for receiving said capsule (11), and circulating said fluid into said capsule, (iii) optionally a capsule holder (9) for holding said capsule (1 1), at least at the time said capsule is disposed into said
machine, characterized in that: the
machine (1) comprises a linear
barcode reader (21) suitable for reading a linear
barcode sequence (25) contained in a segment S having a
segment length LR, said linear
barcode reader (21) being disposed in the machine such that it can read a barcode printed on the capsule while said capsule is being inserted inside said machine, and the capsule (1 1) comprises a barcode sequence (25) that is repeatedly printed along a
peripheral path of the capsule, each sequence being disposed in an arc having a linear projected length LS that is inferior to LR and said sequence (25) is composed of dots (26) spaced apart from one another along said arc, such that their projected point images along a linear segment are also spaced apart.