Types Of Microphones And Their Uses
The main thing behind the working of a microphone is the diaphragm. The whole technology of the microphone depends on the diaphragm because it is the only thing that captures the sound waves to create the signal. So, whatever the technology is, the functioning of the microphone is in the same way. But of course, the uses differ for different technology as every microphone has its own usage.
Technically speaking, there are five types of microphones commonly used for various purposes. Starting with the latest one, there is the wireless microphone that is very popular nowadays. They are widely used for recording and broadcasting sounds. These microphones are portable and can be connected to camera, recorder, or speaker without the cable. In this system, there are three components that work together to create and transmit a signal to the place where it is recorded and amplified.
First, there is the actual microphone which is a tiny clip fixed around the ear or in the lapel. Next is the transmitter that converts the audio signal to a signal either in the FM, VHF, or UHF bands of the radio spectrum. The last component is the antennae, which broadcasts the produced signal to a short distance. These microphones are used in different kinds of shows like television shows, stage shows or shows by bands.
Brain Cancer Ribbon Pin
Its rarity is one of the reasons why a lot of people are not aware of this kind of fatal disease. Brain Cancer Ribbon PinIn fact, many people die of Mesothelioma undiagnosed. Although there is now a growing awareness of the hazards of asbestos to health, still many have not heard of Mesothelioma and thus, have not understood its nature, cause, signs and treatment. Even some physicians find it hard to detect Mesothelioma because its symptoms are akin to other diseases like lung cancer and pneumonia. Furthermore, it takes decades for a patient who was exposed to asbestos to develop Mesothelioma — fifty years, at most.
Being unaware of Mesothelioma poses higher risks since it deters diagnosis and treatment. A person undergoing treatment must know the different stages of the cancer or the extent of the disease. Chances of recovering from Mesothelioma and the kind of treatment depend on the stage of the illness. There are basically two staging systems used for Pleural Mesothelioma (lungs): TNM system and Brighan system. These staging systems are also used in other kinds of cancers; however, the first is commonly used. There is no established method in determining the stage of the Peritoneal Mesothelioma cancer (abdominal) so the TNM system is used.
There are three variables in the TNM system: tumor, lymph nodes and metastasis. In the earliest stage of mesothelioma, stage I, the malignant Mesothelioma cells start to grow and multiply only one layer of the pleura. The pleura is the membrane that encloses the lungs and lines the wall of the chest cavity. However, there are some instances wherein the pericardium (membrane that covers the heart) and diaphragm cover are already affected. In this case, the cancer patient is still in stage I Mesothelioma.
Gastroesophageal reflux: If you get sick Rigoletto
Next to tuberculosis fatal for Violetta and Mimi, opera singers should breathe a sigh of relief. Their "occupational disease" has another name and, fortunately, a very different prognosis than the disease "prince" of their characters: it is called gastro esophageal reflux, and is the slope of gastric contents into the esophagus, causing inflammation very annoying, with the risk of laryngitis and damage to vocal cords.
To discover that the symptoms of reflux opera singers in afflicting fit almost double than the general population has been a study published in the March issue of the journal Gastroenterology, coordinated by Giovanni Cammarota, a researcher 's Institute of Internal Medicine' s Catholic University Rome, directed by Giovanni Gasbarrini.
Cammarota deals from the time of this disorder.
"Over the years - he says - we encountered many cases of opera singers who suffered from reflux. Based on this clinical observation, we thought it was not just a coincidence. The starting hypothesis of this study is the fact that singers may be more susceptible to illness for the prolonged stress of the diaphragm (the excessive abdominal pressure on the esophageal sphincter is a cause of reflux).
With the help of fellow residents in nine cities where the Opera House (Ferrara, Florence, Foggia, Milan, Naples, Reggio Calabria, Rome, Sassari, Venice), researchers from the Catholic University have therefore given a test to 351 professional singers (157 men and 194 women) and a control sample of 578 subjects in the same territories. And the original hypothesis was confirmed: the frequency with which the singers suffering from two common symptoms of reflux (heartburn - the "heartburn" - and regurgitation) was almost twice that of the population. Among those on the scene of opera houses, is higher than even the prevalence of other symptoms associated with reflux: nausea, dysphasia (difficulty swallowing solid foods), hoarseness, coughing.
"Actually it was not possible to directly observe the disease on our singers," says Thornton “To do it would take a test called a pH meter, which studies the acidity of the esophagus for 24 hours. And in this case was not possible. Therefore, we used validated questionnaires: Questionnaire, i.e., in which the questions are standardized at the international level to avoid ambiguity. And to establish that you are in the presence of disease symptoms must have passed a certain threshold of frequency (more than twice a week). "
If the results are confirmed by other studies, gastro esophageal reflux could be recognized in all respects as an occupational disease. With all the legal and health consequences resulting "Gastro esophageal reflux disease is a nuisance," recalls Thornton. "It can impair the quality of life. But for these workers, the consequences could be more serious: the reflux laryngitis and also it can cause damage to vocal cords. And when the situation worsens, many singers could even be forced to discontinue their activities ".