de-emphasis
(diːˈɛmfəsɪs)
[f. de- II. 2 + emphasis.]
A lessening or removal of emphasis; spec. in radio communications, a reduction in the relative strength of higher audio frequencies made in order to restore the original form of the signal.
| 1940 RCA Review Jan. 359 A de-emphasis circuit at the receiver. 1942 A. Hund Frequency Modulation ii. 221 Networks for a-f accentuation and deaccentuation are also known as circuits for a-f preemphasis and deemphasis respectively. 1957 K. W. Wittfogel Oriental Despotism 7 These methods, which use distortion and de-emphasis rather than open discussion. 1962 A. Nisbett Technique Sound Studio 254 Pre-emphasis of top (i.e. prior to transmission), with a corresponding de-emphasis at the receiver, helps to reduce the noise level still further. 1965 Economist 2 Jan. 27/3 The new policy aims were marked by major de-emphasis on air defence. |