1 / 10

Thought of the Day

Men and women who turn their lives over to God will discover that He can make a lot more out of their lives than they can. He will: deepen their joys, expand their vision, quicken their minds, strengthen their muscles, lift their spirits, multiply their blessings,

ismael
Télécharger la présentation

Thought of the Day

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Men and women who turn their lives over to God will discover that He can make a lot more out of their lives than they can. He will: • deepen their joys, • expand their vision, • quicken their minds, • strengthen their muscles, • lift their spirits, • multiply their blessings, • increase their opportunities, • comfort their souls, • raise up friends, • and pour out peace. • Whosoever will lose his life in the service of God will find he has eternal life. • - Pres. Ezra Taft Benson Thought of the Day IT 327 - Schweber Chap 3

  2. Schweber, Chap 3: DeciBels and Noise IT 327 - Schweber Chap 3

  3. 1 Just a littletickler IT 327 - Schweber Chap 3

  4. DeciBels • Origin of the unit? • Why? For Power: dB = 10 log10 (P2/P1) For Voltage: dB = 20 log10(V2/V1) OR: For Power: dB = 10 log10 (Pout/Pin) For Voltage: dB = 20 log10 (VMeas/VRef) Example 1: Perfectwire (R = 0Ω; L = 0H; C = 0F) P1 = 1W; P2 = 1W. Find dB. IT 327 - Schweber Chap 3

  5. DeciBels: More Examples P1= 1W; P2 = 0.5W. Find dB. V1= 10V; V2= 5W. Find dB. P1 = 50W; P2 = 0.1aW. Find dB. Voyager 1 & 2 P1 = 1W; P2 = 1000W. Find dB. Commercialpoweramplifier P1= 50kW; P2 = 10µW. Find dB. Commercial AM radio (KSL 1160) IT 327 - Schweber Chap 3

  6. DeciBels: Standard References dBW = 1 W Howmuchis 20 dBW? dBm = 1 mWHowmuchis -30 dBmW? dBV = 1 V Howmuchis 40 dBV? dBmV = 1 mVHowmuchis -120 dBmV? dBc = ideal carrier dBi = isotropic (omnidirectional) dB (audio) = ? Howmuchis 30 dB? 70 dB? 100 dB? 120 dB? IT 327 - Schweber Chap 3

  7. Noise in Systems IT 327 - Schweber Chap 3

  8. Definition of BW IT 327 - Schweber Chap 3

  9. Definition of BW IT 327 - Schweber Chap 3

  10. Acceptible SNR • Audio: 90 dB (Classical); 40 dB (other) • Video: 60 dB • Digital: 20 dB • Space: -60 dB IT 327 - Schweber Chap 3

More Related