pre-emphasisn.

Brit.

/priːˈɛmfəsɪs/, U.S.

/priˈɛmfəsəs/

Origin: Formed within English, by derivation. Etymons: pre- prefix, emphasis n.

Etymology: < pre- prefix + emphasis n.

Chiefly Sound Recording and Broadcasting.

A systematic distortion applied to an audio or video signal prior to transmission or recording, usually in order to improve signal-to-noise ratio, involving an increase in the relative strength of certain frequencies in anticipation of a corresponding decrease (de-emphasis) made during reception or playback.

ΘΚΠ

society > communication > broadcasting > putting on or producing broadcast > [noun] > various techniques

fade1918

mix1922

pre-emphasis1940

society > communication > record > recording or reproducing sound or visual material > sound recording and reproduction > [noun] > skewing of frequencies to exclude noise

pre-emphasis1940

1940 RCA Rev. Jan. 359 The use of [a] pre-emphasis circuit at the transmitter and a de-emphasis circuit at the receiver produces an overall gain in signal-noise ratio.

1959 K. Henney Radio Engin. Handbk. (ed. 5) xxi. 35 Above 500 cps a preemphasis above a constant velocity is given to the high frequencies, especially over the noise frequency range. The necessary characteristic for reproduction is the inverse of this curve.

1989 T. T. Brown in D. H. Middleton Avionic Syst. viii. 190 Some improvement in articulation index is obtained with about 6 dB/octave pre-emphasis of the higher frequencies of the voice channel.

2001 Future Music June 73/2 You can add pre-emphasis here too, which isn't really necessary these days either.

This entry has been updated (OED Third Edition, March 2007; most recently modified version published online March 2022).

单词	pre-emphasis
释义	pre-emphasisn. Brit. /priːˈɛmfəsɪs/, U.S. /priˈɛmfəsəs/ Origin: Formed within English, by derivation. Etymons: pre- prefix, emphasis n. Etymology: < pre- prefix + emphasis n. Chiefly Sound Recording and Broadcasting. A systematic distortion applied to an audio or video signal prior to transmission or recording, usually in order to improve signal-to-noise ratio, involving an increase in the relative strength of certain frequencies in anticipation of a corresponding decrease (de-emphasis) made during reception or playback. ΘΚΠ society > communication > broadcasting > putting on or producing broadcast > [noun] > various techniques fade1918 mix1922 pre-emphasis1940 society > communication > record > recording or reproducing sound or visual material > sound recording and reproduction > [noun] > skewing of frequencies to exclude noise pre-emphasis1940 1940 RCA Rev. Jan. 359 The use of [a] pre-emphasis circuit at the transmitter and a de-emphasis circuit at the receiver produces an overall gain in signal-noise ratio. 1959 K. Henney Radio Engin. Handbk. (ed. 5) xxi. 35 Above 500 cps a preemphasis above a constant velocity is given to the high frequencies, especially over the noise frequency range. The necessary characteristic for reproduction is the inverse of this curve. 1989 T. T. Brown in D. H. Middleton Avionic Syst. viii. 190 Some improvement in articulation index is obtained with about 6 dB/octave pre-emphasis of the higher frequencies of the voice channel. 2001 Future Music June 73/2 You can add pre-emphasis here too, which isn't really necessary these days either. This entry has been updated (OED Third Edition, March 2007; most recently modified version published online March 2022). < n.1940
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