Search results
Results From The WOW.Com Content Network
Active noise control ( ANC ), also known as noise cancellation ( NC ), or active noise reduction ( ANR ), is a method for reducing unwanted sound by the addition of a second sound specifically designed to cancel the first. The concept was first developed in the late 1930s; later developmental work that began in the 1950s eventually resulted in ...
The process may have different rules depending on the area, but the general rules are that as soon as one person puts their finger on their nose to signal that "Nose Goes" is being used to resolve a decision, every other member of the group is prompted to touch their nose. The last person to put their finger on their nose gets assigned the task.
A stenomask is a hand-held microphone built into a padded, soundproof enclosure that fits over the speaker's mouth or nose and mouth. Some lightweight versions may be fitted with an elastic neck strap to hold them in place while freeing the user's hands for other tasks. The purpose of a stenomask is to allow a person to speak without being ...
In a noisy environment, both microphones receive noise at a similar level, but the primary mic receives the desired sounds more strongly. Thus if one signal is subtracted from the other (in the simplest sense, by connecting the microphones out of phase) much of the noise is canceled while the desired sound is retained.
Xavier Pallàs plants his feet on the belfry floor, grips the rope, and with one tug fills the lush Spanish valley below with the reverberating peal of a church bell. For most, church bells are ...
If the delay is slightly longer, around 50 milliseconds, humans cannot hear the echo as a distinct sound, but instead hear a chorus effect. In the earlier days of telecommunications, echo suppression was used to reduce the objectionable nature of echos to human users. One person speaks while the other listens, and they speak back and forth.
Elevated workplace or environmental noise can cause hearing impairment, tinnitus, hypertension, ischemic heart disease, annoyance, and sleep disturbance. [ 3][ 4] Changes in the immune system and birth defects have been also attributed to noise exposure. [ 5] Although age-related health effects ( presbycusis) occur naturally with age, [ 6] in ...
The attorney general for Washington, D.C., sued StubHub on Wednesday, accusing the ticket resale platform of advertising deceptively low prices and then ramping up prices with extra fees. The ...