Reducing noise Audacity Wiki. Noise reduction is the constant challenge for the recording engineer, as perhaps the most significant aspect of improving recording quality. Following the advent of realistically priced recording hardware, and free software like Audacity, anyone now can be their own recording engineer and grapple with the same problems. Start your reading with this article, and the Related articles below Quick summary Avoid noise in the first place instead of trying to remove it afterwards. Spend as much money as you can use a soundcard with balanced inputs, and use shielded cable, sufficiently long so that you can move the microphone right away from the computer. If money is at a premium, an inexpensive external USB soundcard should other things being equal be much quieter than the motherboard sound device that came with the computer. Place the microphone on a floor stand and ground it separately from the computer, or use a ceiling suspended microphone. Keep all microphone cables away from mains electricity cables. Prevent noise. To prevent noise entering your microphone recording. Set the correct input level of your sound sources. Set it as high as possible to increase the dynamic distance of sound and noise, but as low as necessary to prevent clipping. If you have it at hand use a hardware limiter as long as Audacity cannot process sound in real time. Personally, when recording a band I use a simple foot pedal limiter on the vocals, because these seem to be the most dynamic sound source. The input level of instruments can be adjusted quite easily. OPgF6pq7Y/UKDP5gc2m5I/AAAAAAAAFY8/kJ0ean4jyy0/s1600/18.jpg' alt='Crackling Noise While Breathing' title='Crackling Noise While Breathing' />Buy SoundSleep High Fidelity Sleep Sound Machine with Real NonLooping Nature Sounds, Fan Sounds, White Noise, and Adaptive Sound Technology on Amazon. FREE. Lizzy Goodmans new book, Meet Me In The Bathroom, documents an era in rock music that many of us remember well. It uses oral history to tell the story of the. Read about causes and treatment of ear clicking. PD/1569565975001/201410/1569565975001_3830536805001_A-BreathLG.jpg' alt='Crackling Noise While Breathing' title='Crackling Noise While Breathing' />When you have found the optimal levels, decrease them about a d. B or two when recording music just to be sure. When actually performing, musicians tend to be a little bit louder than in rehearsal mode. Shut every non used sound channel and sound source. Mute non used channels on your mixing board, switch off non used amps, keyboards, and dont forget shut the door and the window. Especially in a home recording environment, avoid switching lights or electric machines on or off during recording, because a spark can cause a knack on the track. Abnormal sounds may resemble a musical wind instrument or be more rough in quality like a grating noise. Some conditions may cause crackling, creaking, bubbling or. Fluid in the lungs is a broad term to describe two possible conditions that may give characteristic symptoms, like a bubbling sound in the lungs rales when breathing. Prison Tatt Records releases onesided vinyl LPs and compact discs. TM89VU.xxlarge/i/Kimberly-McDonald-18-karat-white-gold-geode-diamond-earrings.jpg' alt='Crackling Noise While Breathing' title='Crackling Noise While Breathing' />Avoid fluorescent lighting but dont use dimmer switches with incandescent light bulbs because a mic can easily pick up the noise acoustically or create induced noise as a result. See below for more about noise from lighting. Keep cell phones a good distance away from any equipment. If you are close to a cell phone tower, try to record in a room that is farthest away from it. Noise tends to stay on the same low level and cannot be controlled in general you dont have a fader for it, do you, but the record source is often dynamic and may change and can be controlled. So you may get aware of your potentials in noise control here. Initially non audible noise often comes to attention when a low signal is amplified andor normalized because normalizing and amplifying increases both the wanted signal and the unwanted noise. Therefore, the measures and proceedings I described prevent some of the typical noise problems later. Environmental Noise. Room Noise Use a directional microphone. Cheap PC mics, besides having rotten sound quality, are nearly omnidirectional i. Many professional mics Shure SM5. SM5. 8 for example are highly directional. If the business end is not pointing at the noise source, it wont pick up the noise. It may still pick up ambient noise, including any sound originating elsewhere in the room and bouncing off the walls. That will be reduced if you put the microphone right on top of the sound source. When recording vocals, the performers lips should almost be touching the mic, and sing straight into it not across the top. Ambient noise will be blocked by the singers head. Use a noise blocking stand and a long enough cable to distance the mic from the computer. Often times the vibrations from a computers fans and drives will vibrate the computer desk and the surrounding area. If the microphone and its stand are on the computers desk, the microphone often will pick up the vibrations and produce a noise on the audio track often referred to as a warble sound a soft, repeating hum. To help prevent this, use a ceiling suspended microphone stand or a full size floor stand that can have its height adjusted. If these pricey options are not available, an alternative is to support a desk stand using a sound insulating lift, such as a flimsy cardboard shoe box or a number of newspapers. These things insulate the noise rather well, making it difficult for any vibration noises to flow through to the microphone. Almost any lift made of non rigid, flexible material will do. Direct connection. If recording instruments like keyboards and electric guitars, feed their signal directly into your soundcards line input, or to a sound board and then into your PC. Guitars will need preamps. If youre recording acoustic instruments, use directional microphones placed close to the instrument, or use a pickup with preamp and connect direct. Get the desired signal as loud as possible without clipping into the microphone. This allows you to reduce the gain, which will also reduce the low level noise. The further a microphone is away from the source, the more you have to amplify the mics input signal to get to a usable level. But, boosting the gain amplifies everything, including background sounds and even the internal electrical noise of the amplifier. Ideally, the microphone should be right on top of the source, with the gain no higher than necessary to get peaks around 3d. B. If you are doing multitrack recording, record each individual track as loudly as possible. Set the final volume of each track during post production mixdown. Note placing the microphone right on top of the sound source might not be ideal when recording certain sources such as bowed instruments like violins and cellos. Instead of placing the mic right on top of your sound source without regard to factors other than noise, you should experiment with different kinds of microphone placement until you find one that provides the best sound. If the optimal placement is too noisy you can look for other ways to reduce the noise. In the end, nothing beats an ideal recording environment. Active Directory User Account Enabled Attribute Definition more. Post recording noise reduction. Noise can often be reduced during post production, by use of various plug ins. Typically, they are fed a sample of the noise alone and then subtract that noise from the rest of the recording. To facilitate this, be sure to record a second or two of silence before you start the actual performance. This gives you a clean sample of the noise. This works extremely well with low level background sound like air conditioning. Dont forget the possibilities of non technical noise reduction. Turn off your refrigerator and furnace air conditioner during the recording session. Watch out for telephones, cell phones, pagers, ticking clocks, lawnmowers, and the like. Avoid locating the recording session near airports, train tracks, and fire stations. Hang blankets on the walls, to dampen a live room. Or record in a room with wall to wall carpeting. If you can, record in a basement, to help isolate your session from outside noise. Youll probably need to use the blanket on the wall trick here, since concrete walls make good sound reflectors. Record late at night to reduce traffic noise leaking in from outside. Its up to you to work this out with the neighbors. Landing of the Vostok spacecraft. Vostok lands successfully. On the way back, everything looked good until the conclusion of the 4. Moscow Time. The spacecraft started spinning about its axis with very high speed. For decades, the very fact, not to mention the cause of the whole incident with the separation of the capsule and its instrument module remained unknown to the general public. Even half a century later, popular accounts of the accident are wildly inaccurate. Previous chapter Vostok orbits the Earth. A bumpy ride home Everything looked good until the conclusion of the 4. Moscow Time. In his post flight report, Gagarin wrote As soon as TDU braking engine shut down, there was a sharp jolt. The spacecraft started spinning about its axis with very high speed. The Earth was passing in the Vzor window from top to bottom and from right to left. The speed of rotation was around 3. Everything was spinning. One moment I see Africa it happened over Africa another the horizon, another the sky. I barely had time to shade myself from the sun, so the light did not blind my eyes. I put my legs toward the bottom window, but did not closed the blinds. I wanted to find out myself what was going on. Gagarin, was expecting the separation of his reentry capsule from the instrument module to take place 1. In the meantime, the spacecraft continued tumbling wildly, as it approached denser layers of the atmosphere. Despite this situation, Gagarin wrote that he believed everything was on track for a safe landing On the phone I reported that the separation had not taken place. I decided that the situation was not an emergency, with the code system I transmitted VN4, which stands for Vse Normalno, Everything alright. According to Gagarin, the separation finally did take place at 1. Mediterranean Sea. Braking glitch For decades, the very fact, not to mention the cause of the whole incident with the separation of the capsule and its instrument module remained unknown to the general public. Even after Gagarins report was published, at least one participant of the events denied any problems during the reentry and tried to explain the situation by Gagarins confusion about the real time of the separation. However thanks to the efforts of the Novosti Kosmonavtiki magazine, and, particularly, its tireless researcher Igor Lissov, 2. As it turned out, a single valve within the braking engine failed to shut completely at the beginning of the engine burn, letting some fuel leak out and avoid the combustion chamber. As a result, the engine ran out of gas and shut down around a second earlier than scheduled. The aborted maneuver slowed the spacecraft by 1. Even though it was enough to push the spacecraft off its orbit toward reentry, it was apparently not enough for the punctual flight control system to generate the nominal command to cut off the engine. In the absence of a proper cutoff command, the propellant lines of the engine remained open, after it ran out of fuel and stalled. As a result, the pressurization gas and remaining oxidizer continued escaping through the main nozzle and steering thrusters, causing the spacecraft to spin wildly. Although the engine was later cut off by a timer, the lack of delivered thrust also caused the flight control system to scrub the primary sequence for the separation between the reentry vehicle and the instrument module. Fortunately, the separation did take place some 1. Moscow Time, supposedly, as a result of an emergency command. The exact mechanism which generated this backup command was a subject of debate as late as 2. The prevailing theory was that temperature sensors reacting to the heat of atmospheric reentry triggered the separation. However, estimates made by Igor Lissov showed that by 1. Therefore, this aspect of the flight still remained under a question mark as of 2. Reentry and landing. Skype 4.5 Windows Xp. The descent module of the Vostok 3. KA No. 3 spacecraft which carried Yuri Gagarin into space. The capsules hatch can be seen on the left and the demo version of the ejection seat is on the right. A guide rail used by the ejection seat is well visible in the lower section of the main hatch. A storage locker can be seen above. Vostok carried enough provisions for a 1. As the spacecraft plunged into the atmosphere, Gagarin saw a bright crimson glow appear behind his windows. It was accompanied by the crackling noise of thermal protection layers burning in the heat of atmospheric reentry. Gagarin estimated that at their peak g forces exceeded 1. There was a moment, about 2 3 seconds, when data on the control gauges started looking blurry. It was starting turning gray in my eyes. I braced and composed myself. It helped, everything kind of returned to its place. Potentially much more troubling and unexpected than g loads was the burning smell in the cabin. Fortunately, it was very slight and short lived, according to Gagarins recollections after the flight. As G forces subsided and the capsule continued descending safely, Gagarin prepared to eject from his craft. At an altitude of seven kilometers, the main hatch of the capsule was jettisoned and seconds later, the pilot ejected. It was 1. 0 4. 2 Moscow Time. Gagarins ejection seat then came lose gently and he was left falling toward earth. The main parachute of the PS 6. As a result, Gagarin was descending under two parachutes. During the parachute descent, which lasted from six to 1. Gagarin struggled to open a valve for breathing atmospheric air. The device stuck below his external orange layer and he had to use a mirror to pull the valve. According to Gagarin, he gently hit the soft surface of freshly plowed dirt in an open field not far from the town of Engels. Later, his landing was determined to be not far from the village of Smelovka, in the Ternovsky District near Saratov. Many sources say Gagarin landed at 1. Moscow Time 2. 28 but, according to post flight report dated May 2. Moscow Time. They were 1. On July 1. 7, 2. 01. Russian government declared a monument three kilometers southeast of the Novaya Ternovka station in the Saratov Oblast, Engels District, a federal cultural heritage site. Post landing recovery operations. A local woman Anikhayat Takhtarova and her five year old grandaughter Rumiya Nurskanova, who were planting potatoes near by, were initially scared when they saw a man dressed in a bright orange suit and a helmet walking toward them across the field. However they overcame their doubts and responded to his greetings. Takhtarova helped Gagarin to open a tight lock of his helmet and offered him milk from a can she had with her for lunch. According to the commander of an anti aircraft division in the area Major Akhmed Gasiev, he heard the loud bang and his subordinate Sopeltsev told him that he had seen a flying vehicle in the air. Deputy Commander of the Unit, Konstantin Kopeykin immediately departed toward the expected landing site of the spacecraft on a crawler track, while Gasiev headed toward descending Gagarin on a wheeled track. Gasiev confirmed that he saw Gagarin touch the ground at 1. Gagarin attempted to make an official report to Gasiev, but he interrupted him with a big hug. Gagarin asked for the nearest telephone and Gasiev offered to drive him to his unit from where they could make a call. According to Gasiev, Gagarin spent around 4. Gagarin reported to General Vovk that he had been in good shape.