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Author: admin, 03.05.2014. Category: Severe Tinnitus Symptoms

Traditionally, hearing aids have been unable to provide sufficient amplification for sounds beyond 4,000 to 6,000 Hz. Recently, several manufacturers have introduced “extended bandwidth” hearing aids, which promote improved receivers that sufficiently amplify sounds to 8,000 Hz and beyond.
Rather than attempting to extend the limits of the hearing aid's frequency response, some manufacturers have developed hearing aids with frequency-lowering technology. Non-linear frequency compression (NLFC) (Figure 2C) takes high-frequency information above a designated frequency range, referred to as the crossover frequency, and compresses it into a lower range as determined by a pre-set frequency compression ratio.
Spectral envelope warping (SEW) (Figure 2D) is designed to capture a high-frequency sound information and replicate it at a lower frequency.
All of the aforementioned frequency-lowering strategies possess potential advantages and limitations, and there are no published research studies showing one approach to be superior to another.
Ask your audiologistAs previously mentioned, there can be disadvantages associated with frequency-lowering technology. One of the most pressing difficulties of persons with hearing loss is an inability to effectively understand speech in the presence of noise. Directional microphone technology typically employs two or more microphones to amplify sounds coming in from the front as prescribed, while limiting or reducing amplification for sounds coming from the sides and back.
Although directional microphones may improve speech recognition in noise, it is probably prudent to refrain from their use until a child is old enough to consistently orient toward the signal of interest and provide verbal feedback about the potential perceived advantages and limitations of directional amplification. Digital noise reduction (DNR) is another hearing aid noise technology designed to improve performance in noisy environments. As with directional hearing aids, we are still examining the appropriateness of DNR for young children. However, it is important to remember that not all hearing aids work alike, and it is possible that some DNR algorithms may reduce gain for speech.
Almost every major hearing aid manufacturer now has a way to wirelessly link your hearing aids with your personal technology (from phones to computers to TVs). Personal remote microphone radio frequency (RF) systems have been around for a long time, and have long been recognized as the most effective means to improve speech recognition in noisy places.
Perhaps it’s just icing on the cake, but besides all of the great technology that allows individuals to hear better in a variety of settings, several hearing aid companies have now made some of their products water-resistant.
In summary, hearing aid technology has improved significantly over the past few years.  Although it is not perfect, contemporary technology can improve the communication abilities of most everyone with hearing difficulties. Sensory presbycusis: This refers to epithelial atrophy with loss of sensory hair cells and supporting cells in the organ of Corti. Mechanical (ie, cochlear conductive) presbycusis: This condition results from thickening and secondary stiffening of the basilar membrane of the cochlea. The rest of my answer is based on this book, some parts of which exist online (which I'll quote).
As you can see from the graph, severity of age-related hearing loss depends on sound frequency: older people need high-pitched sounds to be displayed more loudly, in order to hear them.
It's not described much on the website, but the book explains that there is a relationship between how loud a sound has to be to harm you, and which frequency it is. Here's a plot of the connection between loudness and frequency in auditory perception, in which you can see that sounds around 4kHz can most easily harm us. Does this explain that when I was younger, I was more sensitive to sound and slept less well?
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If you have a high frequency hearing loss, it means that you do not hear tones or parts of speech which are high frequency. The exact numbers vary, but most authorities agree that the frequency range of human speech goes from about 250 Hz all the way up to 9,000 Hz, with the majority of speech taking place in the 500 Hz to 3500 Hz range. There are many causes of high frequency hearing loss, and sometimes your hearing loss may be due to several of these causes. If you’d like a free phone consultation with a licensed hearing provider, please feel free to call us at 800-731-6794.
For people with HFHL, it can be as though someone has removed certain letters from the alphabet in speech. Clearly the best thing to do is to be knowledgeable about the types of causes for hearing loss and how to avoid them. Should the worst occur and you have discovered some hearing loss, there are some options available.
While there are treatments available, and there are new breakthroughs happening all the time in the field, the best measures to take are ones of prevention. Caring for the ears is as simple as identifying the hazards and putting measures in place to either avoid or protect from these hazards. When aiming to treat, instead of only protect, The Hearing Loss Pill team has created a post specifically covering all of the available options which include everything from stem cell treatments to cochlear implants. Some data from studies is showing that high frequency hearing loss is actually getting worse in the main population, particularly in the youth. A: Possible causes for HFHL include extreme noise exposure, genetics, aging, ototoxicity, and desease. A: Hearing Aids can take the higher frequency sounds, not heard by someone with HFHL, and lower the frequency one of two ways.
Today, some advanced technology features, which were formerly only available in expensive, high-end hearing aids, are now available in economy-level hearing aids. The ability to hear high-frequency speech sounds is crucial for understanding speech as well as the rules underlying language and grammar, such as plurality, possessives and subject-verb agreement. The speech sounds on the audiogram are placed in the pitch and intensity range at which the sounds are typically heard. This constraint was primarily attributed to a limitation of the hearing aid receiver (the term used to refer to the miniature speaker of the hearing aid), which simply could not provide adequate amplification of high-frequency sounds. Although this technology is promising, there is a paucity of studies showing significant improvements in speech recognition with the use of extended bandwidth amplification. Frequency lowering can be achieved by linear frequency transposition (LFT), non-linear frequency compression (NLFC), or spectral envelope warping (SEW). Similar to LFT, the bandwidth of the high-frequency sound information is not altered, SEW moves the high-frequency of sound to a lower frequency range, where the low-frequency and high-frequency sounds are overlaid on one another. In particular, if the frequency-lowering is too aggressive, then speech and environmental sounds may become distorted resulting in poor sound quality and a reduction in speech understanding. Studies have shown that around 40% of adult wearers continue to be unsatisfied with their ability to hear in noise after being fitted with hearing aids (Kochkin, 2010).
This approach assumes that the wearer will face the signal of interest in a noisy environment, and consequently, the speech will be enhanced and the surrounding noise will be reduced. In fact, some hearing aids even go a step further and remain in omni-directional mode if the primary signal arriving from behind the user is speech. Hopefully, ongoing research and development will clarify the question of whether young children should use adaptive directional amplification and possibly even result in a hearing aid that limits the potential disadvantages of directional amplification for children.

DNR analyzes the sound arriving to the hearing aid, determines whether it is speech or noise, and reduces the aided gain when background noise is the dominant input. It is imperative that the audiologist verify that gain is not reduced when speech is present. In people with typical hearing, the ears work together to better understand speech in noisy environments as well as to determine the direction from which a sound originates.
Directionality with Binaural Processing.Furthermore, some hearing aids work together so that a wearer may adjust the volume or a program on one hearing aid and the change automatically happens at the other hearing aid.
Some companies use “streamers” (a device you wear around your neck to allow you to interface between the hearing aids and the accessory) to wirelessly connect to your personal products, while other manufacturers have developed hearing aids that allow you to wirelessly connect without an interface device.
Recently, manufacturers have started introducing digitally-modulated RF systems, which are similar to Bluetooth® technology used in several recreational and business applications.
Some even claim you can swim with them.  It is important to consider how the warranty works if you do choose to participate in water activities with the hearing aids on. If you are struggling with your hearing, you should consult your audiologist to determine whether new technology may alleviate your communication difficulties. Characteristically, presbycusis involves bilateral high-frequency hearing loss associated with difficulty in speech discrimination and central auditory processing of information.
This process originates in the basal turn of the cochlea and slowly progresses toward the apex. The thickening is more severe in the basal turn of the cochlea where the basilar membrane is narrow.
The question is being unable to hear ranges as we get older, starting from childhood, while presbycusis is specific to post middle-aged people. Sounds that are near our auditory thresholds (under 20 Hz and above 20.000 Hz in the normal, healthy hearing range) can't harm us even if they are extremely loud.
Remember, high frequency hearing loss is not a type of hearing loss, it can be thought of as the nature of the hearing loss. If you break down human speech, vowels are in the low frequency range- between 250 Hz and 1000 Hz.
The majority of time however, high frequency hearing loss is caused simply be the general aging process.
Tiny hair cells that line the cochlea (a sensory organ inside the inner ear) pick up sound waves and transform them into nerve signals that the brain interprets as sound. Hearing aids magnify sound vibrations so your surviving hair cells can detect those more powerful vibrations and convert them to signals that are then sent to the brain. Tinnitus is a condition in which damage to the ear results in sufferers hearing sound or noise that isn?t there. Hearing deteriorates with age to a certain degree, and this decline can be exacerbated by any number of other factors. The goal is to become educated on the risks of damaging noises and to minimize any potential hearing loss as we age.
These can range from heavy-duty work earmuffs that cover the whole ear to small, inconspicuous plugs for watching bands.
HFHL usually impairs the inner ear, which affects how sound is received and transmitted as signals to the brain.
Obviously this plan will differ person to person: a truck driver might identify far different noise hazards than a full-time mother.
Frequency transposition, the first option, takes the higher frequency energies and moves them to a lower frequency. The truth is that most people never do anything with the products they buy, so most of the time, they dona€™t get ANY results.
This article discusses several new hearing aid technologies and suggests questions that you may want to ask your hearing health providers when you select your next set of hearing aids. Furthermore, research has shown that when children with hearing loss cannot adequately hear sounds above 4,000 Hz, they will have to be exposed to three times as many words as children with typical hearing to learn new vocabulary and concepts due to the reduced acoustic bandwidth caused by the hearing loss (Pittman, 2008). Audiologists should properly select good candidates for frequency-lowering technologies, program this technology appropriately for the individual’s needs, and verify the benefit the wearer receives through the use of probe microphone measures (ask your audiologist about probe microphone measures if you are unaware of this important hearing aid assessment tool). Numerous research studies have shown that directional microphones improve speech understanding in noise more than any other technology currently built into hearing aids (although directional microphones do not provide as much improvement in speech understanding in noise as remote microphone radio frequency systems—also commonly known as FM systems—which are an assistive technology that may be used with hearing aids to provide the most improvement in speech recognition in noise (Schafer & Thibodeau, 2004)). With this approach, the risk of missing out on important speech signals arriving from behind or from the side of a hearing aid wearer is limited. Bentler and colleagues (2010) did show that DNR may improve listening comfort for children in noisy situations. For instance, we can tell that a sound originates from our right side, because it is a little louder and arrives a little earlier at the right ear than the left.
Some hearing aids also have the capability of allowing the user to hear the sound from a telephone in both ears simultaneously when the phone is placed next to one of the hearing aids. Here, a directional hearing aid provides amplification for sounds arriving from directly in front of the wearer, while reducing the volume for sounds arriving from other directions. Here, a listener is using hearing aids with directional microphones enhanced by binaural processing.
Some manufacturers also offer a wireless microphone accessory, which can pick up an important voice and wirelessly send it to the hearing aids directly or via the streamer.
Because the microphone is positioned closely to the mouth of a parent or teacher, the speech signal captured by the system’s microphone is typically much higher in volume level than the surrounding background noise. Digital RF systems are able to provide a higher level of analysis and control over the signal that is captured by the microphone and eventually delivered to the receiver. Some are not “water-resistant” per se, but have a special coating inside the electronics that helps repel moisture—especially good if you (or your child) are susceptible to excessive sweating or have wax problems.
These changes correlate with a precipitous drop in the high-frequency thresholds, which begins after middle age. This correlates with a gradually sloping high-frequency sensorineural hearing loss that is slowly progressive.
The wiki page does refer to the issue as presbycusis, yet every reliable source on presbycusis lists it as being limited to post middle-aged people. We don't hear them because they cause no mechanical change in our ear that responds to those frequencies, and consequently no harm is done. Sure, most high frequency hearing losses are sensorineural hearing losses, but you could absolutely have a conductive hearing loss that is high frequency in nature as well. When these hair cells become damaged or die over time, those sound waves are not effectively transformed in to nerve signals, so the sound never reaches the brain. So essentially, hearing aids are “waking up” hair cells which were not working well enough, and then the hair cells do the rest of the work and send the signals to the brain. What happens is the tiny hair nerves that are contained in the basilar membrane die as a result to over-exposure to loud noises. It might not even be something noticeable at the time; rather, it will be a slow deterioration.
Carrying around a pair of the smaller ones are a good idea, especially if you think you might be exposed to noise.

While there is no cure as such for hearing loss, there are a range of treatments and aids to improve the quality of hearing. There is only a limited amount of times the ears can be exposed to loud noises before they start to deteriorate.
A range of ear protection, from the large rubber earmuffs to smaller earplugs, are a great investment and should always be close to hand ?
This is hypothesized to be due to noise induced hearing factors from an increase of noise in daily activities, including everything from normal environmental noise to the increased use of ear buds for music listening. The second way, known as nonlinear frequency compression, uses a compression ratio on the high frequency sound to lower it.
The “Familiar Sounds Audiogram” shown in Figure 1 illustrates the large number of consonants that reside in the high frequencies.
Further, the benefits of frequency-lowering technology should be validated with behavioral testing and feedback from parents, speech therapists, and teachers. Hearing aid manufacturers have developed numerous technologies to improve performance in noise, including directional microphones, digital noise reduction (DNR), wind noise reduction, and dereverberation algorithms. We know that incidental listening, the term used to describe a child’s tendency to listen to speech that is not directed specifically to him or her, is responsible for a great deal of a child’s vocabulary and social development.
It is likely that there are differences in adaptive directional algorithms from one manufacturer to another, and consequently, there is not enough evidence to determine whether they are suitable for children.
Other studies have indicated that DNR provides at most a modest improvement, and in many cases, no change in speech understanding in noise (Bentler, 2005; Peeters 2009).
They also showed that children’s novel word learning abilities were improved with the use of DNR, a fact they attributed to a decrease in the cognitive processing load afforded by improved listening comfort associated with DNR. The interested audiologist is referred to an excellent review by McCreery and colleagues on electroacoustic assessment of hearing aids with DNR (McCreery, Gustafson, & Stelmachowicz, 2010). Note how the binaural directional response is more focused on the sounds arriving from the front than the directional response achieved by the hearing aids in Figure 3B. Furthermore, these systems typically use a carrier frequency that “hops” from frequency to frequency many hundred times per second, a characteristic that makes digital RF systems less susceptible to interference from nearby RF devices (Wolfe et al., in press).
Additionally, make certain you see a licensed audiologist who is experienced with providing new technology for patients in your age range (or the range of your child).
The abrupt downward slope of the audiogram begins above the speech frequencies; therefore, speech discrimination is often preserved. It seems the wiki page is the only source referring to range of audible frequencies in young people as presbycusis? In the case of age-related hearing loss, the hair cells in the inner ear that should respond to high-frequency sounds, have already stopped responding, so there is nothing left to harm. But the fact is, there are many parts of speech which are above 2,000 Hz as well, and that’s where the problem lies. On the other hand, consonants are in the high frequency range- between 2000 Hz and 3500 Hz.
This means that when you wear hearing aids, they are only making some sounds louder- not all of them. These hair nerves are what transmit sound to the brain to be interpreted into aural messages ?
This means that instead of taking in a whole day?s worth of exposure to loud noises, we see them as isolated incidents. We know better than that: we cover up our skin, we use sunblock, and we get our skin checked for moles and melanomas. A medical practitioner will be able to determine exactly what hearing loss you suffer from, as well as in what frequencies, and will be able to recommended treatment. The testimonials you see on this web site are some of our better results and are not typical. Most studies have shown no degradation in speech recognition in noise for adults using DNR. The best technology in the world can be worthless if it is not selected and fitted appropriately to meet the wearer’s needs.
Histologically, the atrophy may be limited to only the first few millimeters of the basal end of the cochlea. Hearing aids (when properly programmed) are only going to make those sounds louder which you aren’t already hearing. Only a very low percentage of patients will ask for a hearing test when they visit their GP.
Any music lover should consider the volume levels they enjoy their music at, as many people turn music up far too high (especially with ear-buds). Hearing aids, sound therapy and possibly surgery are all methods that are used to help amplify and possibly correct to a degree a person?s hearing.
They stuck to the dose as directed and maintained a healthy lifestyle and balanced diet alongside it. More recently, Wolfe and colleagues (submitted, 2013) compared aided thresholds and speech recognition for a group of children who had mild hearing loss and used hearing aids with NLFC and extended bandwidth. Carol Flexer has estimated that as much as 90% of what a child learns during the first few years of life comes from incidental listening (Cole & Flexer, 2010).
So if you are suffering from a high frequency hearing loss, it is because you are hearing the vowels properly, but not the consonants. The result is getting those high frequency sounds back, and hearing speech much more clearly.
If there is a ringing noise in the ears in an otherwise silent room, this is tinnitus1 and suggests that the ears have been over-exposed to noise.
If it?s someone who works with heavy machinery, or in areas of high traffic, or even as a bartender, a day?s worth of sound exposure could be happening at levels that damage the ears. NLFC provided better access to low-level high-frequency sounds as well as better recognition of high-frequency speech sounds when compared to hearing aids with extended bandwidth. Could directional microphones, which inherently limit access to sounds arriving from behind a child, interfere with incidental listening?
One theory proposes that these changes are due to the accumulation of lipofuscin pigment granules. With a high frequency hearing loss, it becomes very difficult to get any clarity out of speech- everything sounds very mumbled. If you believe you have a high frequency hearing loss, your best course of action is to see a hearing aid provider near you, get a free test done, and start a free trial period with hearing aids. Today’s hearing aids are incredibly intelligent, can be 100% invisible, and are very comfortable- give them a try!

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