Different Level of Sounds from different sources and different sound from alphabets
Normal hearing is when the softest sounds heard are between -10 and 20 dB. If the sounds are louder than 20 dB and you still can’t hear them, then there is a hearing loss. If the sounds are quieter than 20 dB and you cannot hear them, it may just be that your threshold of hearing is 20 dB. The further down the chart the line of your hearing test comes, the more of a hearing loss you have.
Mild hearing loss is between 21dB and 40dB. You often have difficulty following speech especially in noisy situations. This type of loss is often noticed by family first rather than yourself.
Moderate hearing loss is between 41dB and 70dB. You often have difficulty following speech and other quiet noises. Amplification can be very successful for this loss but you also need to use good hearing tactics (e.g. lipreading, expression, gesture).
Severe hearing loss is between 71dB – 95dB. You are unable to hear speech even in quiet surroundings and do not hear general noises such as traffic unless it’s loud. Amplification can be very successful for this loss but you need to use good hearing tactics (e.g. lipreading, expression, gesture). Lipreading classes will also be very useful if you have this hearing pattern.
Profound hearing loss is greater than 95dB. You are unable to hear most sounds unless really loud. Amplification is often useful but you need to rely on good communication tactics including lip-reading, subtitles on TV and possibly signing.