Are you looking to get a brand new a couple of cordless loudspeakers for your home? You may be dazzled by the number of alternatives you have. To make an informed selection, it is best to familiarize yourself with frequent terms. One of these specs is referred to as "signal-to-noise ratio" and is not often understood. I am going to help explain the meaning of this expression.
Once you have chosen a range of wireless loudspeakers, it's time to explore several of the specs in more detail to help you narrow down your search to one model. One important parameter of wireless loudspeakers is the signal-to-noise ratio. To put it simply, the signal-to-noise ratio shows how much hum or hiss the speakers will add to the music signal. This ratio is commonly shown in decibel or "db" for short.
Comparing the noise level of different sets of cordless loudspeakers can be done fairly simply. Just get together a number of types that you want to evaluate and short circuit the transmitter audio inputs. Afterward put the wireless loudspeaker volume to maximum and verify the level of static by listening to the speaker. The noise that you hear is created by the wireless loudspeaker itself. After that compare different sets of wireless loudspeakers according to the next rule: the lower the amount of static, the better the noise performance of the wireless speaker. Though, bear in mind that you must set all sets of wireless speakers to amplify by the same level in order to compare several models.
In order to help you evaluate the noise performance, cordless speaker suppliers show the signal-to-noise ratio in their wireless loudspeaker spec sheets. Simply put, the larger the signal-to-noise ratio, the lower the level of noise the cordless speaker produces. Noise is generated due to several factors. One factor is that today's wireless loudspeakers all employ elements including transistors as well as resistors. Those elements will generate some amount of hiss. The overall noise depends on how much noise each element creates. However, the position of those elements is also vital. Components that are part of the loudspeaker built-in amplifier input stage will generally contribute most of the noise.
Hiss is also created by the cordless transmission. Different types of transmitters are available that work at different frequencies. The cheapest kind of transmitters makes use of FM transmission and usually broadcasts at 900 MHz. Other wireless transmitters are going to interfer with FM type transmitters and result in further hiss. As a result the signal-to-noise ratio of FM style wireless loudspeakers changes depending on the distance of the loudspeakers from the transmitter in addition to the level of interference. To steer clear of these problems, newer transmitters use digital music broadcast and typically transmit at 2.4 GHz or 5.8 GHz. The signal-to-noise ratio of digital transmitters is independent from the distance of the cordless loudspeakers. It is determined by how the audio signal is sampled. Furthermore, the quality of parts inside the transmitter are going to affect the signal-to-noise ratio.
The majority of of latest cordless loudspeaker use amplifiers which are based on a digital switching topology. These amplifiers are referred to as "class-D" or "class-T" amplifiers. Switching amplifiers incorporate a power stage which is continuously switched at a frequency of approximately 400 kHz. This switching noise can result in a certain amount of loudspeaker distortion but is usually not included in the signal-to-noise ratio which merely considers noise between 20 Hz and 20 kHz.
Makers measure the signal-to-noise ratio by setting the built-in amplifier such that the full output swing can be realized and by feeding a test signal to the transmitter which is usually 60 dB underneath the full scale of the speaker amplifier. Next, only the noise in the range of 20 Hz and 20 kHz is considered. The noise at other frequencies is removed through a filter. Subsequently the amount of the noise energy in relation to the full-scale output wattage is computed and expressed in decibel.
Frequently you are going to discover the expression "dBA" or "a-weighted" in your cordless loudspeaker spec sheet. A weighting is a method of showing the noise floor in a more subjective way. This method tries to evaluate in how far the wireless loudspeaker noise is perceived by human hearing which is most perceptive to signals at frequencies at 1 kHz. The A-weighted signal-to-noise ratio is usually higher than the unweighted ratio and is shown in most cordless speaker spec sheets.
Once you have chosen a range of wireless loudspeakers, it's time to explore several of the specs in more detail to help you narrow down your search to one model. One important parameter of wireless loudspeakers is the signal-to-noise ratio. To put it simply, the signal-to-noise ratio shows how much hum or hiss the speakers will add to the music signal. This ratio is commonly shown in decibel or "db" for short.
Comparing the noise level of different sets of cordless loudspeakers can be done fairly simply. Just get together a number of types that you want to evaluate and short circuit the transmitter audio inputs. Afterward put the wireless loudspeaker volume to maximum and verify the level of static by listening to the speaker. The noise that you hear is created by the wireless loudspeaker itself. After that compare different sets of wireless loudspeakers according to the next rule: the lower the amount of static, the better the noise performance of the wireless speaker. Though, bear in mind that you must set all sets of wireless speakers to amplify by the same level in order to compare several models.
In order to help you evaluate the noise performance, cordless speaker suppliers show the signal-to-noise ratio in their wireless loudspeaker spec sheets. Simply put, the larger the signal-to-noise ratio, the lower the level of noise the cordless speaker produces. Noise is generated due to several factors. One factor is that today's wireless loudspeakers all employ elements including transistors as well as resistors. Those elements will generate some amount of hiss. The overall noise depends on how much noise each element creates. However, the position of those elements is also vital. Components that are part of the loudspeaker built-in amplifier input stage will generally contribute most of the noise.
Hiss is also created by the cordless transmission. Different types of transmitters are available that work at different frequencies. The cheapest kind of transmitters makes use of FM transmission and usually broadcasts at 900 MHz. Other wireless transmitters are going to interfer with FM type transmitters and result in further hiss. As a result the signal-to-noise ratio of FM style wireless loudspeakers changes depending on the distance of the loudspeakers from the transmitter in addition to the level of interference. To steer clear of these problems, newer transmitters use digital music broadcast and typically transmit at 2.4 GHz or 5.8 GHz. The signal-to-noise ratio of digital transmitters is independent from the distance of the cordless loudspeakers. It is determined by how the audio signal is sampled. Furthermore, the quality of parts inside the transmitter are going to affect the signal-to-noise ratio.
The majority of of latest cordless loudspeaker use amplifiers which are based on a digital switching topology. These amplifiers are referred to as "class-D" or "class-T" amplifiers. Switching amplifiers incorporate a power stage which is continuously switched at a frequency of approximately 400 kHz. This switching noise can result in a certain amount of loudspeaker distortion but is usually not included in the signal-to-noise ratio which merely considers noise between 20 Hz and 20 kHz.
Makers measure the signal-to-noise ratio by setting the built-in amplifier such that the full output swing can be realized and by feeding a test signal to the transmitter which is usually 60 dB underneath the full scale of the speaker amplifier. Next, only the noise in the range of 20 Hz and 20 kHz is considered. The noise at other frequencies is removed through a filter. Subsequently the amount of the noise energy in relation to the full-scale output wattage is computed and expressed in decibel.
Frequently you are going to discover the expression "dBA" or "a-weighted" in your cordless loudspeaker spec sheet. A weighting is a method of showing the noise floor in a more subjective way. This method tries to evaluate in how far the wireless loudspeaker noise is perceived by human hearing which is most perceptive to signals at frequencies at 1 kHz. The A-weighted signal-to-noise ratio is usually higher than the unweighted ratio and is shown in most cordless speaker spec sheets.
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