Talvez deva tentar algumas variações de ortografia:
singnal processing » signal processing (Expandir a busca), singal processing (Expandir a busca), signals processing (Expandir a busca)
deceased singnal » received signal (Expandir a busca), deferred signal (Expandir a busca), increased signal (Expandir a busca)
decrease during » increase during (Expandir a busca), increases during (Expandir a busca), increased during (Expandir a busca)
during decrease » during increased (Expandir a busca), during depressed (Expandir a busca), during disease (Expandir a busca)
decrease with » decreases with (Expandir a busca), increase with (Expandir a busca), decrease in (Expandir a busca)
with deceased » with decreased (Expandir a busca), with increased (Expandir a busca), with disease (Expandir a busca)

Você pode obter mais resultados ajustando o argumento de busca.

• Remover as aspas pode possibilitar buscas mais amplas: (( decrease with deceased singnal processing ) OR ( decrease _ decrease during decrease ))~.