emphasis vs modulation

emphasis

noun
  • Special attention or prominence given to something. 

  • The phonetic or phonological feature that distinguishes emphatic consonants from other consonants. 

  • Special weight or forcefulness given to something considered important. 

  • The use of boldface, italics, or other such formatting to highlight text. 

  • Prominence given to a syllable or words, by raising the voice or printing in italic or underlined type. 

modulation

noun
  • The variation and regulation of a population, physiological response, etc. 

  • The process of applying a signal to a carrier. 

  • A change in key. 

How often have the words emphasis and modulation occurred in a corpus of books? (source: Google Ngram Viewer )