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downconvert, v.

Origin: Formed within English, by derivation. Etymons: down- prefix, convert v.
 1. transitive.

 a. Electronics. To convert (a signal) to a lower frequency.

1959   Proc. IRE 47 42/2   The signal and lower sideband were both down-converted by a second S-band local oscillator.
1989   Jrnl. Magn. Resonance 84 433   Circuitry was constructed to down-convert the RF pulses from 1.7 MHz to 425 kHz.
2018   V. In & A. Palacios Symmetry in Complex Network Syst. v. 198   The second array downconverts the output of the first array.

1959—2018(Hide quotations)


 b. To convert (a high definition video signal) to standard definition. Also intransitive.

1986   Billboard 23 Aug. 46/1   Northern Light is hoping that once ‘Chasing Rainbows’ is down-converted and aired on normal domestic TV, the signal will still be four to five times clearer than a standard NTSC television image.
2003   Pop. Sci. Dec. 78/3   The camera can accommodate a variety of playback equipment, downconverting to 480i mode for standard home analog equipment.
2005   Pop. Sci. Aug. 22/2   The Samsung SP-H800BE.., Hitachi PJTX100 and Toshiba TDP-MT800 will down-convert incoming 1080p material to 720p.
2016   D. Weynard & V. Piccin How Video Works (ed. 3) xiii. 168   Some HD VCRs are even equipped to downconvert a signal internally.

1986—2016(Hide quotations)


 2. intransitive. In quantum physics (of a photon): to be converted into two photons via downconversion (downconversion n. 2). Also transitive.

1980   D. G. Blair in C. Edwards Gravitational Radiation, Collapsed Objects & Exact Solutions 314   The lower sideband is generated by events as shown in Figure 4b where incoming pump photons down-convert.
1994   Physical Rev. A. 49 3211/2 (caption)    An ultraviolet pump photon may be spontaneously down-converted in either of two nonlinear crystals.
2012   Optics Lett. 37 3730/2   The antisymmetric..pump will now downconvert to signal and idler photons with opposite parity.

1980—2012(Hide quotations)




  downconˈverted adj.

1965   E. Gehrels Rev. Long-Range Earth Strain Measurem. Techniques (MIT Lincoln Lab. Techn. Note: No. 1965-62) 3   The phase of this down-converted signal is the same..as the phase that would have been received had it been possible to re-transmit from B the same frequency as received from A.
1990   Physical Rev. A. 42 567/2   The down-converted signal and idler photons..have a large frequency spread.
2012   P. J. Cianci High Definition Television v. 111   A downconverted signal was distributed over the Capitol's cable system, enabling those on the Hill to witness the event.

1965—2012(Hide quotations)


  downconˈverting   n.

1962   IRE Trans. Microwave Theory & Techniques 10 394/1   The reverse procedure of down-converting is not practical because the power gain is always less than unity.
1980   IEE Proc. H. 112 (abstract)    There are many techniques for synthesising microwave frequencies, including up-converting by multiplication, sampling, down-converting and comparing to a low-frequency reference.
2010   D. Draven Filmmaker's Bk. of Dead xvi. 252   Downconverting is a postproduction process of taking higher resolution source material..and converting to lower resolution source material.

1962—2010(Hide quotations)


This is a new entry (OED Third Edition, December 2018).

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