Vacuum tubes were replaced by smaller and better transistors. The transistor was not only smaller but also needed less power and sounded better than the vacuum tubes. With the small transistors, hearing aids were finally able to be worn inside or behind the ear, making hearing aids much more popular.
Later in the 20th century, transistors were beginning to be made out of silicon and hearing aids could be made even smaller. Microprocessors were created and also added into hearing aids and sound signals were made to be processed digitally. Eventually, this allowed for hearing aids to be programmed, and customised to the needs of users. The technology inside the hearing aids is similar to the technology in mobile phones, computers and televisions.
Presbycusis
Presbycusis is a type of sensorineural hearing loss which is caused by natural aging. Presbycusis occurs over time, becoming worse as people age and can not be reversed. It is the most common form of hearing loss and the second most common illness among older people, effecting up to 1 in 3 people by the age of 65.
As a form of hearing loss, presbyusis will result in a decreased ability to hear sounds. Since it is a form of hearing loss that occurs over time, many people do not realise that they are affected and continue to believe that their hearing is normal. There are symptoms however that provide clear signs that hearing loss is present.
Communication for people who are experiencing presbycusis usually will become a lot more difficult. Although noises may still sound loud, it is common that with this hearing loss, the sounds will not be clear. This is especially true when hearing high-pitched or high-frequency sounds.
Unlike other forms of hearing loss such as noise-induced hearing loss it is a normal part of aging. Even though it occurs naturally, there are factors that can make it worse and make it happen earlier in life. Presbycusis is usually a form of sensorineural hearing loss, which means that it is due to problems in the inner ear or the hearing nerve due to loss or damage to the hair cells that line the inner ear. The most common causes of sensorineural hearing loss are exposure to loud noise for long periods of time as well as some diseases.
Most hearing loss can both be prevented or managed if the proper precautions are taken.
Hyperacusis
Hyperacusis is a hearing health problem where people become more sensitive to some sounds for certain frequencies and volumes. This can make everyday sounds such as a car, dishwasher or refrigerator sound very loud. It is usually very difficult to tolerate and can be uncomfortable or even painful for people experiencing it.
The increasing sensitivity of the ears caused by hyperacusis is usually painful for many people. Not only can it negatively effect the everyday lives of people experiencing it, it can for some make it very difficult and even not possible to do their everyday jobs and take care of their responsibilities. There are many symptoms experienced by those with hyperacusis.
Similarly to other hearing problems, hyperacusis can occur suddenly or gradually over time and is a problem that can affect people of all different ages in one or both ears. Again, like other forms of hearing problems, there are a variety of possible causes ranging from exposure to noise and other diseases.
Although these are the main causes of hyeracusis and can be seen as causes related to most hearing problems, there are other less common, possible causes such as post-traumatic stress disorder.
Hyperacusis cannot always be fully cured, but for most patients the symptoms get better with time and treatment. Patients will need to learn to use hearing protection against sounds which are very loud, but to not use these in everyday situations. Protecting the ears too much will make the symptoms worse instead of better.
Bolesław Bierut
Bolesław Bierut was a Polish Communist leader. He became President of Poland after the Soviet Union took leadership of the country. Bierut was a strong supporter of Stalinism.
Władysław Gomułka
Władysław Gomułka was a Polish communist politician. After World War II he was the leader of Poland until 1948. Following the Polish October he became leader again from 1956 to 1970.
Gomułka was one of the key leaders of the Warsaw Pact. He supported Poland's participation in Prague Spring in August 1968. One of his notable achievements was negotiating the Treaty of Warsaw (1970) with West Germany. The treaty meant Germany agreed to the post-World War II borders.
Tinnitus masker
A tinnitus masker is an electronic device that produces noise at low levels and is used by those experiencing tinnitus to cover up the ringing or other sounds they are hearing. Many people who experience tinnitus also have hearing loss and are able to use a hearing aid that also acts as a tinnitus masker. These devices will usually need to be customised by an audiologist to ensure that the masking noise used brings relief to the user as tinnitus is experienced differently by everyone.
Tinnitus is experienced differently by everyone. It can be occasional or constant, can come as different sounds and can be loud or soft. How loud it is (the sensation level) compared to other noise in the environment is an important factor when setting the sound generator. The level of noise produced by a sound generator depends on the sensation level of tinnitus experienced and can be close to this level of this noise or even louder. The purpose of this is to cover up the tinnitus sounds by having a constant noise playing in the background. Noise produced by a tinnitus masker, which is called white noise, is designed to be calming and less irritating than tinnitus sounds. Tinnitus maskers are not actually eliminating tinnitus or reducing it but provide a distraction to cover it up for those experiencing it.
The idea behind tinnitus maskers can be explained by a light analogy. While turning on a lamp in a dark room will be very noticeable and the change in lighting will be very obvious, the change from turning a lamp on in a room that is already lit will not be very obvious. The change would have been masked by the other light that was already present in the room.
Fengning
Fengning Manchu Autonomous County, Chengde City, Hebei Province jurisdiction, established in 1987. According to "Manchu name test": Fengning County name comes from Emperor Qianlong Yuci, take the word "Fung Fukang Corning."
Geographic location: longitude 116.65 ° north latitude 41.2 °
Qing Emperor Qianlong forty-three years (1778) was built Fengning county.
When the Republic of Fengning under the Rehe system.
In 1940 the county seat by the town moved to town.
May 1948 liberation.
December 2, 1986, the State Council approved the establishment of Fengning Manchu Autonomous County.
April 1987 Fengning Manchu Autonomous County officially listed.
Fengning paper cutting has a long history, Fengning folk paper-cut began in the reign of Emperor Kangxi, the beginning of paper-cut is used to reinforce the windows, blocking the window joints, and later gradually developed, gradually rich colors, the development of the characteristics of decorations, cultural values are also rising . 1993 Fengning was the Ministry of Culture named "Chinese folk paper-cut art town" now has Wei Wene, Shi Junfeng and other cultural heritage successor
In 2014, the Ministry of Culture website published "on the publicity of the fourth batch of national intangible cultural heritage representative list of projects recommended list" announcement, Fengning Teng cloth paste successfully included in the fourth batch of national intangible cultural heritage Directory. Teng 's cloth painting is a new painting by Teng Teng, a folk artist of Fengning, Hebei. His technique is a combination of painting, sculpture, heap embroidery, thangka and paper - cutting, and the materials are exquisite, colorful and delicate. Realistic, drawn widely.