Hearing aids Technology

             Hearing aid

hearing aids technology includes the working of a digital hearing aid. I let us know how the modern hearing aids are being used these days by the deaf people or the people with the hearing impairment. Hearing aids are mostly comes with a small device that is wireless as well it is much safe as compared to the old hearing aids.

Wireless hearing aids

Recent hearing aids include wireless hearing aids. One hearing aid can transmit to the other side so that pressing one aid's program button simultaneously changes the other aid and both aids change background settings simultaneously. FM listening systems are now emerging with wireless receivers integrated with the use of Hearing aids. A separate wireless microphone can be given to a partner to wear in a restaurant, in the car, during leisure time, in the shopping mall, at lectures, or during religious services. The voice is transmitted wirelessly to the Hearing aids eliminating the effects of distance and background noise. FM systems have shown to give the best speech understanding in noise of all available technologies. FM systems can also be hooked up to a TV or a stereo.

In developed countries FM systems are considered a cornerstone in the treatment of hearing loss in children. More and more adults discover the benefits of wireless FM systems as well, especially since transmitters with different microphone settings and Bluetooth for wireless cell phone communication have become available.

Many theaters and lecture halls are now equipped with assistive listening systems that transmit the sound directly from the stage; audience members can borrow suitable receivers and hear the program without background noise. In some theatres and churches FM transmitters are available that work with the personal FM receivers of hearing instruments.

Hearing aids Technology

Hearing aids Processing

Analog audio/Adjustable control: The audio circuit is analog with electronic components that can be adjusted. The hearing professional determines the gain and other specifications required for the wearer, and then adjusts the analog components either with small controls on the hearing aid itself or by having a laboratory build the hearing aid to meet those specifications. After the adjustment the resulting the audio does not change any further, other than overall loudness that the wearer adjusts with a volume control. This type of circuitry is generally the least flexible. The first practical electronic hearing aid with adjustable analog audio circuitry was based on US Patent 2,017,358, "Hearing Aid Apparatus and Amplifier" by Samual Gordon Taylor, filed in 1932.

·      Analog audio/Programmable control: The audio circuit is analog but with additional electronic control circuitry that can be programmed, sometimes with more than one program. The electronic control circuitry can be fixed during manufacturing or in some cases, the hearing professional can use an external computer temporarily connected to the hearing aid to program the additional control circuitry. The wearer can change the program for different listening environments by pressing buttons either on the device itself or on a remote control or in some cases the additional control circuitry operates automatically. This type of circuitry is generally more flexible than simple adjustable controls. The first hearing aid with analog audio circuitry and automatic digital electronic control circuitry was based on US Patent 4,025,721, "Method of and means for adaptively filtering near-stationary noise from speech" by D Graupe, GD Causey, filed in 1975. This digital electronic control circuitry was used to identify and automatically reduce noise in individual frequency channels of the analog audio circuits and was known as the Zeta Noise Blocker.

·      Digital audio/Programmable control: Both the audio circuit and the additional control circuits are fully digital. The hearing professional programs the hearing aid with an external computer temporarily connected to the device and can adjust all processing characteristics on an individual basis. Fully digital circuitry allows implementation of many additional features not possible with analog circuitry, can be used in all styles of hearing aids and is the most flexible. Fully digital Hearing aids can be programmed with multiple programs that can be invoked by the wearer, or that operate automatically and adaptively. These programs reduce acoustic feedback (whistling), reduce background noise, detect and automatically accommodate different listening environments (loud vs soft, speech vs music, quiet vs noisy, etc.), control additional components such as multiple microphones to improve spatial hearing, transpose frequencies (shift high frequencies that a wearer may not hear to lower frequency regions where hearing may be better), and implement many other features. Fully digital circuitry also allows control over wireless transmission capability for both the audio and the control circuitry. Control signals in a hearing aid on one ear can be sent wirelessly to the control circuitry in the hearing aid on the opposite ear to ensure that the audio in both ears is either matched directly or that the audio contains intentional differences that mimic the differences in normal binaural hearing to preserve spatial hearing ability. Audio signals can be sent wirelessly to and from external devices through a separate module, often a small device worn like a pendant and commonly called a “streamer”, that allows wireless connection to yet other external devices. This capability allows optimal use of mobile telephones, personal music players, remote microphones and other devices. With the addition of speech recognition and internet capability in the mobile phone, the wearer has optimal communication ability in many more situations than with hearing aids alone. This growing list includes voice activated dialing, voice activated software applications either on the phone or on the internet, receipt of audio signals from databases on the phone or on internet, or audio signals from television sets or from global positioning systems. The first practical, wearable, fully digital hearing aid was invented by Maynard Engebretson, Robert E Morley, Jr. and Gerald R Popelka.Their work resulted in US Patent 4,548,082, "Hearing aids, signal supplying apparatus, systems for compensating hearing deficiencies, and methods" by A Maynard Engebretson, Robert E Morley, Jr. and Gerald R Popelka, filed in 1984. This patent formed the basis of all subsequent fully digital Hearing aids from all manufacturers, including those produced currently.

Hearing aids Processing

Types of disability

Types of disability

Disability is caused by impairments to various subsystems of the body - these can be broadly sorted into the following categories.

Physical disability

Any impairment which limits the physical function of limbs or fine or gross motor ability is a physical disability. Other physical disabilities include impairments which limit other facets of daily living, such as severe sleep apnea. Handicap products are being used over to reduce this type of disability

Sensory disability

Sensory disabilities relate mainly to sight and hearing. The inability to smell or taste is relatively rarer and is not always considerered to be a disability. Other sensory impairments such as of the skin senses, the sensing of touch, heat, cold or pain also exist and are commonly associated with physical disabilities involving paralysis.

Visual impairment

Visual impairment (or vision impairment) is vision loss (of a person) to such a degree as to qualify as an additional support need through a significant limitation of visual capability resulting from either disease, trauma, or congenital or degenerative conditions that cannot be corrected by conventional means, such as refractive correction, medication, or surgery.[2][3][4] This functional loss of vision is typically defined to manifest with

1.            best corrected visual acuity of less than 20/60, or significant central field defect,

2.            significant peripheral field defect including homonymous or heteronymous bilateral visual, field defect or generalized contraction or constriction of field, or

3.            reduced peak contrast sensitivity with either of the above conditions.

Hearing impairment

Hearing impairment or hard of hearing or deafness refers to conditions in which individuals are fully or partially unable to detect or perceive at least some frequencies of sound which can typically be heard by most people. Mild hearing loss may sometimes not be considered a disability. Some Hearing aids are used to makes you hearing properly

Olfactory and gustatory impairment

Impairment of the sense of smell and taste are commonly associated with aging but can also occur in younger people due to a wide variety of causes.

There are a wide variety of olfactory disorders:

o   Anosmia – inability to smell

o   Dysosmia – things smell different than they should

o   Hyperosmia – an abnormally acute sense of smell.

o   Hyposmia – decreased ability to smell

o   Olfactory Reference Syndrome – psychological disorder which causes the patient to imagine he has strong body odor

o   Parosmia – things smell worse than they should

o   Phantosmia – "hallucinated smell," often unpleasant in nature

Complete loss of the sense of taste is known as ageusia, while dysgeusia is persistent abnormal sense of taste.

Somatosensory impairment

Insensitivity to stimuli such as touch, heat, cold, and pain are often an adjunct to a more general physical impairment involving neural pathways and is very commonly associated with paralysis (in which the motor neural circuits are also affected).

Balance disorder

A balance disorder is a disturbance that causes an individual to feel unsteady, for example when standing or walking. It may be accompanied by symptoms of being giddy, woozy, or have a sensation of movement, spinning, or floating. Balance is the result of several body systems working together. The eyes (visual system), ears (vestibular system) and the body's sense of where it is in space (proprioception) need to be intact. The brain, which compiles this information, needs to be functioning effectively.

Intellectual disability

Intellectual disability is a broad concept that ranges from mental retardation to cognitive deficits too mild or too specific (as in specific learning disability) to qualify as mental retardation. Intellectual disabilities may appear at any age. Mental retardation is a subtype of intellectual disability, and the term intellectual disability is now preferred by many advocates in most English-speaking countries as aeuphemism for mental retardation.

Mental health and emotional disabilities

A mental disorder or mental illness is a psychological or behavioral pattern generally associated with subjective distress or disability that occurs in an individual, and which are not a part of normal development or culture. The recognition and understanding of mental health conditions has changed over time and across cultures, and there are still variations in the definition, assessment, and classification of mental disorders, although standard guideline criteria are widely accepted.

Developmental disability

Developmental disability is any disability that results in problems with growth and development. Although the term is often used as a synonym or euphemism for intellectual disability, the term also encompasses many congenital medical conditions that have no mental or intellectual components, for example spina bifida.

Types of disability

what is Handicap principle

The handicap principle is a hypothesis originally proposed in 1975 by biologist Amotz Zahavi to explain how evolution may lead to "honest" or reliable signaling between animals who have an obvious motivation to bluff or deceive each other. The handicap principle suggests that reliable signals must be costly to the signaler, costing the signaler something that could not be afforded by an individual with less of a particular trait. For example, in the case of sexual selection, the theory suggests that animals of greater biological fitness signal this status through handicapping behavior or morphology that effectively lowers this quality. The central idea is thatsexually selected traits function like conspicuous consumption, signalling the ability to afford to squander a resource simply by squandering it. Receivers know that the signal indicates quality because inferior quality signallers cannot afford to produce such wastefully extravagant signals.

The generality of the phenomenon is the matter of some debate and disagreement, and Zahavi's views on the scope and importance of handicaps in biology remain outside the mainstream. Nevertheless, the idea has been very influential, with most researchers in the field believing that the theory explains some aspects of animal communication.

what is Handicap principle

Mental health and emotional disabilities

A mental disorder or mental illness is a psychological or behavioral pattern generally associated with subjective distress or disability that occurs in an individual, and which are not a part of normal development or culture. The recognition and understanding of mental health conditions has changed over time and across cultures, and there are still variations in the definition, assessment, and classification of mental disorders, although standard guideline criteria are widely accepted.

A few mental disorders are diagnosed based on the harm to others, regardless of the subject's perception of distress. Over a third of people in most countries report meeting criteria for the major categories at some point in their lives.

The causes are often explained in terms of a diathesis-stress model or biopsychosocial model. In biological psychiatry, mental disorders are conceptualized as disorders of brain circuits likely caused by developmental processes shaped by a complex interplay of genetics and experience. We can used Hearing aids for some having disability in ears.

Diagnosis

Many mental health professionals, particularly psychiatrists, seek to diagnose individuals by ascertaining their particular mental disorder. Some professionals, for example some clinical psychologists, may avoid diagnosis in favor of other assessment methods such as formulation of a client's difficulties and circumstances.The majority of mental health problems are actually assessed and treated by family physicians during consultations, who may refer on for more specialist diagnosis in acute or chronic cases. Routine diagnostic practice in mental health services typically involves an interview (which may be referred to as a mental status examination), where judgments are made of the interviewee's appearance and behavior, self-reported symptoms, mental health history, and current life circumstances. The views of relatives or other third parties may be taken into account. A physical examination to check for ill health or the effects of medications or other drugs may be conducted. Psychological testing is sometimes used via paper-and-pen or computerized questionnaires, which may include algorithms based on ticking off standardized diagnostic criteria, and in rare specialist cases neuroimaging tests may be requested, but these methods are more commonly found in research studies than routine clinical practice.Time and budgetary constraints often limit practicing psychiatrists from conducting more thorough diagnostic evaluations.It has been found that most clinicians evaluate patients using an unstructured, open-ended approach, with limited training in evidence-based assessment methods, and that inaccurate diagnosis may be common in routine practice Mental illness involving hallucinations or delusions (especially schizophrenia) are prone to misdiagnosis in developing countries due to the presence of psychotic symptoms instigated by nutritional deficiencies. Co morbidity is very common in psychiatric diagnoses, i.e. the same person given a diagnosis in more than one category of disorder.

Mental health and emotional disabilities