Are you searching to get a brand new a set of cordless loudspeakers for your home? You may be dazzled by the number of choices you have. To make an informed choice, it is best to familiarize yourself with frequent specs. One of these specs is known as "signal-to-noise ratio" and is not often understood. I will help explain the meaning of this term.
Whilst trying to find a set of wireless speakers, you initially are going to check the price, power amongst other fundamental criteria. However, after this initial choice, you will still have numerous types to choose from. Now you are going to concentrate more on a number of of the technical specs, including signal-to-noise ratio and harmonic distortion. The signal-to-noise ratio is a fairly key specification and explains how much noise or hiss the wireless speaker produces.
You can perform a simple assessment of the wireless loudspeaker hiss by short circuiting the transmitter input, setting the loudspeaker gain to maximum and listening to the loudspeaker. Generally you are going to hear 2 components. The first is hissing. In addition, you will frequently hear a hum at 50 or 60 Hz. Both of these are components which are created by the cordless speaker itself. Make certain that the volume of each couple of wireless loudspeakers is set to the same amount. Otherwise you will not be able to objectively compare the amount of hiss between different models. The general rule is: the smaller the level of hiss which you hear the higher the noise performance.
To help you evaluate the noise performance, cordless speaker producers publish the signal-to-noise ratio in their cordless loudspeaker spec sheets. Simply put, the higher the signal-to-noise ratio, the smaller the level of noise the cordless speaker produces. There are a number of reasons why cordless speakers will add some form of noise or other unwanted signal. Transistors and resistors which are part of every modern wireless speaker by nature produce noise. Typically the components that are situated at the input stage of the built-in power amp will contribute most to the overall hiss. Consequently producers usually are going to select low-noise components while designing the wireless speaker amplifier input stage.
The wireless transmission itself also creates noise which is most noticable with products which make use of FM transmission at 900 MHz. Other cordless transmitters are going to interfer with FM type transmitters and cause further static. Thus the signal-to-noise ratio of FM style wireless speakers changes depending on the distance of the loudspeakers from the transmitter in addition to the amount of interference. To steer clear of these problems, newer transmitters use digital music transmission and typically transmit at 2.4 GHz or 5.8 GHz. This type of audio broadcast offers better signal-to-noise ratio than analog style transmitters. The level of hiss depends on the resolution of the analog-to-digital converters and also the quality of other components.
Many of recent cordless loudspeaker use amplifiers which are based on a digital switching architecture. These amplifiers are called "class-D" or "class-T" amplifiers. Switching amps include a power stage which is continuously switched at a frequency of approximately 400 kHz. Because of this, the output signal of cordless speaker switching amps exhibit a moderately big level of switching noise. This noise component, though, is usually impossible to hear because it is well above 20 kHz. Nonetheless, it can still contribute to loudspeaker distortion. Signal-to-noise ratio is typically only shown within the range of 20 Hz to 20 kHz. Therefore, a lowpass filter is used while measuring cordless loudspeaker amps to remove the switching noise.
The most common technique for measuring the signal-to-noise ratio is to couple the cordless speaker to a gain that enables the maximum output swing. Next a test signal is fed into the transmitter. The frequency of this signal is generally 1 kHz. The amplitude of this tone is 60 dB underneath the full scale signal. Subsequently, only the noise between 20 Hz and 20 kHz is considered. The noise at other frequencies is eliminated via a filter. Then the amount of the noise energy in relation to the full-scale output wattage is computed and expressed in decibel.
Frequently the signal-to-noise ratio is shown in a more subjective manner as "dbA" or "A weighted". In other words, this method attempts to express how the noise is perceived by a person. Human hearing is most sensitive to signals around 1 kHz while signals below 50 Hz and above 14 kHz are hardly noticed. Therefore an A-weighting filter is going to magnify the noise floor for frequencies that are easily perceived and suppress the noise floor at frequencies that are barely heard. The majority of cordless loudspeaker will show a larger A-weighted signal-to-noise ratio than the un-weighted ratio.
Whilst trying to find a set of wireless speakers, you initially are going to check the price, power amongst other fundamental criteria. However, after this initial choice, you will still have numerous types to choose from. Now you are going to concentrate more on a number of of the technical specs, including signal-to-noise ratio and harmonic distortion. The signal-to-noise ratio is a fairly key specification and explains how much noise or hiss the wireless speaker produces.
You can perform a simple assessment of the wireless loudspeaker hiss by short circuiting the transmitter input, setting the loudspeaker gain to maximum and listening to the loudspeaker. Generally you are going to hear 2 components. The first is hissing. In addition, you will frequently hear a hum at 50 or 60 Hz. Both of these are components which are created by the cordless speaker itself. Make certain that the volume of each couple of wireless loudspeakers is set to the same amount. Otherwise you will not be able to objectively compare the amount of hiss between different models. The general rule is: the smaller the level of hiss which you hear the higher the noise performance.
To help you evaluate the noise performance, cordless speaker producers publish the signal-to-noise ratio in their cordless loudspeaker spec sheets. Simply put, the higher the signal-to-noise ratio, the smaller the level of noise the cordless speaker produces. There are a number of reasons why cordless speakers will add some form of noise or other unwanted signal. Transistors and resistors which are part of every modern wireless speaker by nature produce noise. Typically the components that are situated at the input stage of the built-in power amp will contribute most to the overall hiss. Consequently producers usually are going to select low-noise components while designing the wireless speaker amplifier input stage.
The wireless transmission itself also creates noise which is most noticable with products which make use of FM transmission at 900 MHz. Other cordless transmitters are going to interfer with FM type transmitters and cause further static. Thus the signal-to-noise ratio of FM style wireless speakers changes depending on the distance of the loudspeakers from the transmitter in addition to the amount of interference. To steer clear of these problems, newer transmitters use digital music transmission and typically transmit at 2.4 GHz or 5.8 GHz. This type of audio broadcast offers better signal-to-noise ratio than analog style transmitters. The level of hiss depends on the resolution of the analog-to-digital converters and also the quality of other components.
Many of recent cordless loudspeaker use amplifiers which are based on a digital switching architecture. These amplifiers are called "class-D" or "class-T" amplifiers. Switching amps include a power stage which is continuously switched at a frequency of approximately 400 kHz. Because of this, the output signal of cordless speaker switching amps exhibit a moderately big level of switching noise. This noise component, though, is usually impossible to hear because it is well above 20 kHz. Nonetheless, it can still contribute to loudspeaker distortion. Signal-to-noise ratio is typically only shown within the range of 20 Hz to 20 kHz. Therefore, a lowpass filter is used while measuring cordless loudspeaker amps to remove the switching noise.
The most common technique for measuring the signal-to-noise ratio is to couple the cordless speaker to a gain that enables the maximum output swing. Next a test signal is fed into the transmitter. The frequency of this signal is generally 1 kHz. The amplitude of this tone is 60 dB underneath the full scale signal. Subsequently, only the noise between 20 Hz and 20 kHz is considered. The noise at other frequencies is eliminated via a filter. Then the amount of the noise energy in relation to the full-scale output wattage is computed and expressed in decibel.
Frequently the signal-to-noise ratio is shown in a more subjective manner as "dbA" or "A weighted". In other words, this method attempts to express how the noise is perceived by a person. Human hearing is most sensitive to signals around 1 kHz while signals below 50 Hz and above 14 kHz are hardly noticed. Therefore an A-weighting filter is going to magnify the noise floor for frequencies that are easily perceived and suppress the noise floor at frequencies that are barely heard. The majority of cordless loudspeaker will show a larger A-weighted signal-to-noise ratio than the un-weighted ratio.
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