Digital-Recordings Audio CD Hearing Test
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Description: Digital-Recordings Audio CD Hearing Test
Digital-Recordings Audio CD Hearing Test Disc
Digital Recordings of Canada have developed this compact disc that offers an easy and inexpensive method for detecting hearing loss early, allowing you to take preventive and corrective action.
Why? Because many activities subjects you to factors that can damage your hearing. These include excessive sounds from machinery, concerts, sound systems, personal stereos, bars / clubs, power tools, cars / boats; certain chemicals and even some medications.
Why should you be concerned? Because good hearing is important in everyday life, at work and at home. Good hearing keeps you safe when crossing the street or hiking in the bush. It allows you to communicate effectively with family, friends and colleagues. And it brings joy -- the sound of children laughing, music, nature etc. Therefore, it makes good sense to protect it. In some cases you can use ear protection. But since this is not always possible, or often regarded as unnecessary, there is another way to make sure your hearing stays in top shape.
"Digital Recordings' new CD the "AUDIO-CD" is a brilliant step forward ..."AUDIO-CD" is extraordinary and a most ingenious solution to making universal hearing testing cheap, reliable and effective....It makes the testing of hearing a simple home project which can be to the benefit of many people who suffer from partial hearing loss due to noise in the workplace or very loud music during their recreation. Digital Recordings is to be congratulated on taking advantage of modern technology in this ingenious way." Prof.Hugh Jones, H.W. Jones and Assoc., England
How is AUDIO-CD used for hearing testing?
AUDIO-CD provides anyone - for the first time ever - with an easy-to-use, self-administered hearing test right in the comfort of your home. The test is performed over a range of 24 frequencies - from 20 Hz, the lowest frequency humans can hear, to 20,000 Hz, the highest frequency humans can hear. All you need to perform the test is a CD player and a set of headphones or earphones.
How is hearing ability tested with AUDIO-CD?
Very easily! Sitting in a quiet room with headphones on you:
The graph below shows a sample chart of hearing test results. This chart is referred to as an audiogram. The "x"s indicate the left ear results, the "o"s indicate the right ear results. The grey line indicates the "ideal" results, which are the same for both ears.
How can hearing testing with AUDIO-CD help prevent hearing loss?
Permanent hearing loss, often referred to as Permanent Threshold Shift (PTS), can be caused by exposure to excessive sounds, loud music, certain chemicals and some medications. The sad fact is that, once damaged, hearing never gets better. Continued exposure to factors that cause hearing loss will make matters worse. Degradation is gradual. There is usually no pain or other alarming symptoms. Often hearing loss goes unnoticed until it starts interfering with verbal communication. At this point, damage to hearing is already significant.
A regular check of hearing ability (once every 6 months, for example), is the only truly effective method for identifying the early signs of hearing loss. This allows you to take preventive or corrective steps while damage to hearing is still in the early stages. The first audiogram should be used as a reference point and all consecutive audiograms should be compared against it. The series of audiograms will help to uncover any downward trends in one's hearing ability and identify the factors causing hearing loss.
AUDIO-CD is also ideal for determining temporary hearing loss, often referred to as Temporary Threshold Shift (TTS). This type of hearing loss usually disappears within 16 to 18 hours after prolonged exposure to moderate levels of sounds, chemicals or medications. A series of episodes of temporary hearing loss, with insufficient time for recovery between exposure, will eventually cause permanent hearing loss. Therefore, it is important to understand their causes. AUDIO-CD is often the only possible or practical solution for detecting temporary hearing loss. It allows you to test hearing ability right after exposure to sources of damage. To determine the presence and to assess the magnitude of temporary hearing loss, the test results should be compared against the reference audiogram.
Who benefits the most from using AUDIO-CD for hearing testing?
AUDIO-CD is of benefit to both general public and health care professionals. In particular it is of great use to
What do others think about AUDIO-CD?
The following testimonial is typical of those who have used AUDIO-CD: " The quality of the stimuli (i.e. the test tone) is very good and the procedure to find HTs (i.e. Hearing Thresholds) is very clever (my colleague - Dr. Brad McPherson - used the word 'ingenious'). Clearly, given the limitations of testing someone's hearing on his/her own hi-fi at home, it would have been very difficult to find an easier procedure to use." Dr.Valter Ciocca, University of Hong Kong, Hong Kong
AUDIO-CD's technical specifications rival ANSI standards and specifications of the best clinical audiometers on the market today.
How were the "ideal" hearing thresholds determined?
The hearing ability of a group of young children with no history of hearing loss was tested in an audio booth using AUDIO-CD and AKG-K270 headphones. An average hearing threshold was obtained for each of the test tones. The averaged values are the "ideal" hearing thresholds.
At this point the "ideal" hearing thresholds should be viewed as preliminary data. It is the hope of Digital Recordings that AUDIO-CD will be used to further refine them.
How accurately does AUDIO-CD test hearing ability?
The accuracy of the hearing test results depends on the quality of the headphones and the CD player, the noise level in the room at the time of the test and the precision with which the volume level in the headphones was calibrated. The higher the quality of the headphones and the CD player, the quieter the room and the more precise the calibration of the volume level in the headphones, the more accurate the test results will be.
AUDIO-CD contains SDS (special digital signal) for evaluating the CD player's suitability for the hearing test. What about the quality of the AUDIO-CD recording? All test tones, the special calibration tone and the special digital signal were synthesized digitally and are of very high quality.
The factors impacting on the accuracy of test results are less of a concern when the AUDIO-CD is used for monitoring changes in hearing ability. In this case it is the change in the hearing threshold that matters and not its absolute value. However, to get an accurate picture of the trend in one's hearing ability, it is recommended that during all tests the same headphones be used and that the calibrated volume in the headphones stays at the same level from test to test.