How does a speech signal look like?

vowel – a~ (in context "máme")

typical plosive – t (in context "traktor")

likvid – j (in context "aja")

noise – S (in context "rošáda")

likvid – r (in context "traktor")

segment of speech – UrO~, where is r ?

Sometimes is the changing between phonemes so smooth, that it is not possible to visually notice, where the phoneme ends and where does it start (articulation is continuous).