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Sure, after all it is a logarithmic scale.
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What is the range of the human ear?
The audible range varies with age and noise exposure. In frequency, it runs from about 20Hz to about 20 000Hz.In loudness it runs from below 0dB, up to about 120dB.Note since these are average figures, one-half of the folk have more sensitive hearing, and one-half have less sensitive.
How do you convert from db HL to db SPL?
dB SPL is a comparison of a sound level to what was thought to be the threshold of hearing, although today it is known that the value was too high. dB HL is a measure of hearing loss - a comparison of a subjects hearing compared to a 'normal' standard. As they are measure different things a direct comparison is not possible. The differences between dB HL and dB SPL, arise from isophonic curves. There is no direct (linear) formula to convert this but a set of formulas. For different frequencies, different values should be added. For eg., at 1kHz you can state that 0dB HL is around 2dB SPL while at 250Hz, 0dB HL is 12 dB SPL. db HL = db Hearing Level db SPL = db Sound Pressure Level
A sound that measures decibels is 1000 times louder than the threshold of hearing?
The threshold of hearing varies between individuals, but is commonly taken as 0dB. About one-half of the (undamaged, young, non noise-exposed, ... ...) people will have hearing better than the threshold, and the other half will hear worse than the threshold. But to the point, 10dB is 10 times, 20 dB is 100 times, and 30 dB is 1000 times.
The intensity of sounds are measured in units?
Sound intensity or acoustic intensity (I) is defined as the sound power Pac per unit area A. The usual context is the noise measurement of sound intensity in the air at a listener's location as a sound energy quantity - measured in W/m².Our eardrums and microphone diaphragms are moved by sound pressure deviations (p), which is a sound field quantity (measured in pascals Pa). So we measure the sound with a SPL meter (Sound Pressure Level) in decibels.+++There's a gap in that explanation. Sound pressure levels are normally quoted in dB but linearly they are in µPa (microPascals) because the pressure difference across a given sound wave is so tiny. 1µPa = 1 / 100 000 000 000 Bar (1 Bar is the standard atmospheric pressure at mean sea-leve)l.The faintest whisper the healthy human ear can hear is at only 20µPa, but the ear's working pressure range is 1 million µPa (ie 1Pa). So to simplify the calculations, cut out large numbers in the sums and also to cope with the ear's logarithmic response, we use Decibels.A decibel is not a linear unit like a volt or a metre. It is a logarithmic ratio, and is referred to a base level which here is that 20µPa. Since sound power = 20log-to-base-10(measured sound / reference pressure), that reference 20µPa is therefore at 0dB since the fraction is 20/20 = 1 and the log of 1 = 0.We cannot leave those poor decibels hanging in fresh air so the full name of the unit is "0dB re 20µPa" - though the "re" etc is normally omitted if the context is clear.That means the tiniest sound's pressure level our ears can detect (assuming in full health and depending on frequency as the ear's frequency response is not very linear) is a vanishingly small one-five-thousand-millionth of sea-level atmospheric pressure.And the maximum , which is above harmful volume for our ears? 120dB re 20µPa (Log-base-10 of 1 000 000 is 6, so 6 X 20 =120. Long exposure to above about 85dB is harmful.In marine sonar the reference level is 1µPa, so 26dB below the airborne reference based on our human hearing. In that case its marine and air-acoustics levels in dB are respectively 0dB re 1µPa and -26dB re 20µPa.
What is the unit for measuring the amplitude of a sound?
That would be the 'Bel', a unit of sound amplitude named after Alexander Graham Bell, the inventor who studied sound in order to help deaf people. Unfortunately, a Bel was a very large amount of sound - close to the loudness of a jet taking off. As a result, much later, a tenth of a Bel came into common use. The latin for one tenth of anything is, "deci", hence deci-Bel, or deciBel. It is correct to spell it with the capital 'B'. That is why the abbreviation for deciBel is "dB", not "db". +++ Adding to that, the deciBel is not a linear unit nor necessarily of sound. It is used for example in measuring amplifier gains. it is a logarithmic ratio of the measured signals' amplitude relative to the reference level signal for the system being measured. For airborne sound the 0dB reference level is the minimum pressure detectable by the healthy human ear, a staggeringly tiny 20µPa (micro-Pascals) in linear terms. That translates as one-fifty-thousand-millionth of standard atmospheric pressure at mean sea-level. The ear's amplitude response is roughly logarithmic, and the maximum endurable (though painful and harmful) SPL is one million times that reference, so 20Pa, or 120dB re 20µPa to give the unit's proper full name. (log to base-10 of 1 million is 6 so 20X6 =120.) Marine sonar uses 1µPa as the reference or 0dB pressure, i.e. 26dB below the air acoustics reference level. The calculation for that is 20log(1/20), again, the logarithm base is 10, Incidentally, the B is often in lower-case when written in the full word, rightly or not, but the correct abbreviation is still dB.
What is the device that produce gain active or passive?
Either. although a passive device can only produce gain from 0-1 (-inf to 0dB) an active device on the other hand is capable of producing gain thats greater than 1 (0dB)
What is another technical audio term for having your trim set to 0db?
Unity gain.
What is the difference between 0db 3db 5db gain?
Each 3db doubles the apparent volume.
What is the range of the human ear?
The audible range varies with age and noise exposure. In frequency, it runs from about 20Hz to about 20 000Hz.In loudness it runs from below 0dB, up to about 120dB.Note since these are average figures, one-half of the folk have more sensitive hearing, and one-half have less sensitive.
How do you over drive the amplifier?
you overdrive it by clipping it, by having the input signal being to strong. anything above -0db on the amp is clipping, so be careful.
How do you convert from db HL to db SPL?
dB SPL is a comparison of a sound level to what was thought to be the threshold of hearing, although today it is known that the value was too high. dB HL is a measure of hearing loss - a comparison of a subjects hearing compared to a 'normal' standard. As they are measure different things a direct comparison is not possible. The differences between dB HL and dB SPL, arise from isophonic curves. There is no direct (linear) formula to convert this but a set of formulas. For different frequencies, different values should be added. For eg., at 1kHz you can state that 0dB HL is around 2dB SPL while at 250Hz, 0dB HL is 12 dB SPL. db HL = db Hearing Level db SPL = db Sound Pressure Level
What is an acceptable decibel level?
The range is 0dB to 194dBIf you listen to anything over 90dB for a long period of time your hearing will start to go bad.See related link for more information
What is the sound of loudness measured in?
Sound levels are measured in decibels. An increase of 10dB will sound twice as loud. The average adult young man, who has not had his hearing compromised, will have a threshold of hearing of 0dB. Therefore, one-half of them will be able to hear sounds below 0dB; the other half will not. The decibel unit was first used at Bell Laboratories, with regard to transmission losses on electrical circuits. Later this unit was used for Sound. It is named after Alexander G Bell of course; hence the capital B in dB.
What is Loudness of sound is measured?
Sound levels are measured in decibels. An increase of 10dB will sound twice as loud. The average adult young man, who has not had his hearing compromised, will have a threshold of hearing of 0dB. Therefore, one-half of them will be able to hear sounds below 0dB; the other half will not. The decibel unit was first used at Bell Laboratories, with regard to transmission losses on electrical circuits. Later this unit was used for Sound. It is named after Alexander G Bell of course; hence the capital B in dB.
A sound that measures decibels is 1000 times louder than the threshold of hearing?
The threshold of hearing varies between individuals, but is commonly taken as 0dB. About one-half of the (undamaged, young, non noise-exposed, ... ...) people will have hearing better than the threshold, and the other half will hear worse than the threshold. But to the point, 10dB is 10 times, 20 dB is 100 times, and 30 dB is 1000 times.
What is the rms electrical amplitude of this tone in millivolts 80dB and 50mV?
rms - 0.707 times peak 2 peak. since 80dB has no reference there is no answer. dB is mearly a ratio 80dB=10,000 times greater than 0dB dBm is ref to 1 milliwatt and dBu is ref to 0.775 volts RMS if 50mV is p-p then 50mV p-p * 0.707 = 35.35 mV.
What happens to audio when you set the record levels too high?
It depends on the recording device. Analog tape exhibits saturation, which, at low levels may not be noticeable. Digital recorders exhibit digital clipping, where waveforms over 0db are clipped off at the parks. This is usually very audible and is not a pleasant noise.
