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Background Noise For Recording Presentation

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Unwanted noise when recording

Transcript: Shielding and no ground loops in my Bass: Imperceptible Electric noise Each piece of electronic device does make some kind of electrical noise, so: Use the few possible pieces of gear. Use short cables: The longer the cable, the more noise the cable will pick. Use balanced cables (XLR or TRS). Switch off electric power sistems: Dimmers, fluorescent lamps. Use devices with ground electric. High quality gear: good electronic design, EMI shielded instruments... Gain stages: When you amplify the signal you amplify the noise too. So boost level electrically as little as possible. Try to move mic closer to the source instead of increasing gain. Mic placement and type: Use directional mics to isolate the source from a noisy environment. Use high sample rate and high bit depth. Usually we do not like listening to music with noise. If there is much noise, (bad SNR) the signal (relevant information) is lost or misunderstood. Background noise affects the dynamic range: The higher the background noise the lower the dynamic range. Processing noisy tracks consumes more CPU resources: The Plugin processes useless information. Mixing noisy tracks adds noise each other, causing more noise than we had. Noise can be classified according to their origin: Acoustic noise: Sound pressure variations present in the room ambiance. Enters the system through the microphones. Electrical Noise: EMI(*) picked by some components of the gear: cables, bad EMI isolated gear, pickups of the guitar... Inherent noise generated in all semiconductor devices. Thank You! (*) EMI=ElectroMagnetic Interference:The source may be any object, artificial or natural, that carries rapidly changing electrical currents, such as an electrical circuit, cell phones, dimmers, Radio Stations, the Sun or the Northern Lights. What is noise? .... Improve Signal/Noise Ratio: Fermín Laguna Zaragoza, Spain Introduction to Music Production Week 4 Create an isolated space for recording. Identify the sources of noise: Listen carefully to the "silence" or "room tone. Turn off all nearby noise sources to the recording room like A/C, fans, TV... If you can´t turn off, move away from noisy sources. ¿HOW REDUCE NOISE WHEN RECORDING? Noise: Unwanted random and unpredictible waveforms. Reducing electrical noise: Click on the image to see the video: Unwanted noise when recording ¿Why we don´t want noise?: Main types of Noise: Reducing Acoustic Noise: The complete silence does not exist: There is always noise, and the goal is to reduce the noise to a minimum. 62 ECG bpm

The Background Noise

Transcript: Churchill uses the bulldog as propaganda to represent the relentlessness of holding the British line during war. From the Disney propaganda short film "Der Fuehrer's Face" representing Donald Duck making fun of Hitler's claims as a leader, portraying him as the enemy. National security intensified during the war, referencing this piece of propaganda that someone is always watching and monitoring you. During World War II, the television broadcasts ceased, but radio kept the nation well informed of the events of the war while providing drama, music, commentary, and children's programs that brought hope to a nation under siege. The Background Noise World War II : Natalie Bergman and Allison Peto Propaganda Additionally, messages of women working during the war were trageted at the home front. Propaganda also was utilized because it could be the winning or losing factor in a war. It could motivate soldiers, instil hatred for the enemies, and keep support on the home front. Radio broadcasting, music and propaganda played a major role in World War II. The ability to access information more efficiently helped nations under siege and at war. "Lili Marleen" How were radio programs made appealing? Music Radio Hitler saw the condemnation of American jazz as part of a larger plan to liberate Germany from the "deadly embrace" of "Jewish cultural Bolshevism." As a result, "popular" music in Germany consisted largely of official patriotic songs associated with the Reich, folk songs, and some ballads. Strangely enough, one of these ballads had the unusual distinction of being popular on virtually every front in Europe. "Lili Marlene," written by German soldier Hans Leip in 1915, was as popular with Allied troops as it was with the Germans. The range of popular songs was enormous. There were patriotic songs, designed to inspire support for the war effort as well as for the realities of day-to-day life during the war ("Cowards over Pearl Harbor," "America Calling," and "There'll Always Be an England").There were songs directly related to military service, some with specific references to the commanding officers ("Keep Your Powder Dry," and "Here's to You, MacArthur"). Sentimental songs of love and separation were particularly popular ("We'll Meet Again," "White Cliffs of Dover," "In the Mood"). Many shows that aired at the home front during the war incorporated a character from battle who had either returned home due to extensive injuries or highlighted the family of a fallen soldier. Radio What genres of music were popular? A radio broadcasting of "The Liberty" recorded on NBC. Propaganda programs were made appealing because of a revolutionary aspect of new technological advances. Radio propaganda became an influencial tool because it ignored national boarders and made enemy lines closer. It made information accessible and easy to learn about everything going on during the war. Radios gave out official messages, ranging from the urgings to plant victory gardens to reminders of the importance of keeping secrets and not spreading rumors. Likewise, radio shows incorporated war themes into their scripts. It became popular for characters in virtually every genre to discuss the importance of volunteering to help the cause in whatever way possible. Music Radio reached its apex during the 1940s, when Americans relied on it for their entertainment as well as their information about World War II. Radio was used to transmit propaganda not only to the other side, but their own population as well. Its advertising structure was typically single advertisers sponsoring whole shows. Propaganda A beloved song by both the Allied troops and the Germans. Messages Targeted at the Home Front For Americans dealing with World War II, music in all its forms served as a salve, a comfort, and a distraction. Big bands played the biggest part, but jazz and country were starting to have a larger impact. "We Did It Before and We Can do it Again" (by Charles Tobias and Cliff Friend) was the first original American World War II song, whose morale-lifting title reflects the previous Allied victory in World War I. Another song, written just after the attack on Pearl Harbor, was "Remember Pearl Harbor" (by Don Reid and Sammy Kaye), which became a hit when it was recorded a few months later by Sammy Kaye's orchestra. Radio was a popular mass medium for fast distribution of news. Two types of propaganda were played over the radio. There was white propaganda, meaning Nazi affairs were always secretive. The other type of propaganda was black propaganda. It was a world of gloomy transmitters and intricate deceptions. Many people tuned into the propaganda programs because it usually put their country in a higher light, while it would poke fun and shame their enemy countries.

Reducing noise while recording

Transcript: Reducing noise while recording Electrical noise Every piece of gear you will use will have what is called self noise, the sounds that the electricity running through your equipment will make when in use. This is not something you want to have in your signal, so try to simplify your gear to a minimal. Use as few electrical devices as you can, the cables you use should be the shortest possible balanced cables possible. Using high quality equipment also is good for reducing the level of electrical noise. The equipment running on the same power system as your recording equipment (dimmers, electric appliances, etc.) may also introduce unwanted sounds so be sure to turn them off while you record. Another source of electrical noise is gain staging. Try to keep gain as low as possible to avoid boosting the signal electronically which will really increase unwanted sound. Remember mic placement (close enough and well angled) and mic type selection (the right polar pattern) will enable you to avoid having to use too much gain for your recordings. In addition to the sound source you want to record, in every environment there will be additional sounds that are coming from the environment itself. We know that because of propagation the acoustic parameters of the space you have your sound source in will have an impact on your recording. Surplus sound sources (from creaky drum pedals, street noises coming through the window, to the fan cooling the computer or the artist himself, etc.) are all unwanted additions we will have and may hear in our recording. To avoid acoustic noise, we need to remove our target sound as much as possible from the external sound sources. The process starts with listening carefully to what is going on in the to-be recording environment. The quieter you have, the better you will notice the sound sources you will try to isolate your target from. Sound insulation for the recording chamber may be a good idea in order to filter out sounds not belonging in your final recording (e.g. tram going by, dog barking, mom yelling instructions to clean your room, etc.). The acoustics of the room itself are a factor, so placing your (appropriate type of) input transducers as close to your target as possible is a good idea to capture as little of the space as you can. Unless that is what you want, of course. Remember that surplus stuff in the room may also give you unwanted sounds, for example certain frequencies may cause certain equipment to resonate, like cymbals, drumheads, snare wires, window glass sheets, etc.. Remove unnecessary things when recording because things that are quiet now may be "triggered" by your sound source itself. Remember to listen well to find and then eliminate possible surplus sounds from the environment. (disclaimer: The entire presentation focuses on avoiding unwanted noise. If you are consciously using noise as an element of your piece of music, that is a different story. A story we will not be looking into right now) Nothing ever is really quiet To have the cleanest possible end product we will need to be careful with the inputs we feed into the process. As with most aspects of a good recording noise reduction starts with preparation, in this case to avoid different types of noise we may pick up along the way. However, we may want to remember that complete silence is not achievable, as removing external sound sources will be giving way to internal sources, which may prove to be quite unnerving ( ). Nevertheless, reducing the sound sources outside of your targeted source is a good idea, as it is much better to not have those sounds at all then to have to try to remove them from your signal later on. First let us examine the two types of noise, acoustic and electrical that we will need to look out for and then we will take a look at suggestions along the lines of the two slogans: Isolate and Simplify! The other type of noise we will need to look out for is the noise our gear and equipment makes, which may include chatter introduced by the electrical wiring of the house we record in and also the inherent noise made by the recording equipment. Acoustic noise That's it for today. Thanks a lot for your attention and your evaluation. See you next week. Simplify! Hey there! Greg from Hungary with the week 4 assignment for Loudon Stearns' Berklee/Coursera Introduction to Music Production course. Today I'm going to be looking at sources of possible noise that we will want to avoid when making a recording. And for that, we need to look at closely at the details! Isolate!

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