Just How Do Producers Of Wireless Home Speakers Boost The Noise Performance?
It is easy to be baffled by the terminology which wireless speaker producers employ in order to describe the performance of their products. I will explain the meaning of a regularly utilized specification: "signal-to-noise ratio" to help you make an informed choice when buying a brand new a pair of wireless loudspeakers.
As soon as you have selected a range of cordless loudspeakers, it's time to explore a few of the specifications in more detail in order to help you narrow down your search to one product. An important criterion of wireless loudspeakers is the signal-to-noise ratio. To put it simply, the signal-to-noise ratio describes how much hum or hiss the speakers will add to the music signal. This ratio is typically described in decibel or "db" for short.
You can perform a straightforward comparison of the wireless speaker noise by short circuiting the transmitter input, setting the speaker gain to maximum and listening to the speaker. You will hear some amount of hissing and/or hum coming from the loudspeaker. This hiss is produced by the cordless speaker itself. Make certain that the volume of each couple of wireless speakers is set to the same amount. Otherwise you will not be able to objectively compare the level of static between different models. The general rule is: the lower the amount of static that you hear the better the noise performance.
If you favor a pair of wireless loudspeakers with a small amount of hissing, you may look at the signal-to-noise ratio number of the data sheet. Most manufacturers will publish this figure. wireless speakers with a large signal-to-noise ratio will output a low level of noise. There are numerous reasons why wireless loudspeakers are going to add some form of hiss or other unwanted signal. Transistors and resistors which are part of each modern cordless loudspeaker by nature generate noise. The overall noise depends on how much hiss every component produces. Yet, the position of those components is also important. Components that are part of the speaker built-in amplifier input stage are going to normally contribute most of the noise.
The cordless broadcast itself also will cause hiss which is most noticable with types which utilize FM transmission at 900 MHz. The amount of static is also dependent upon the amount of wireless interference from other transmitters. Newer models are going to usually utilize digital music transmission at 2.4 GHz or 5.8 GHz. The signal-to-noise ratio of digital transmitters depends mostly on the kind of analog-to-digital converters and other components that are utilized in addition to the resolution of the wireless protocol.
A lot of modern wireless loudspeakers have built-in power amplifiers that incorporate a wattage switching stage which switches at a frequency around 500 kHz. Consequently, the output signal of wireless speaker switching amps contain a fairly large amount of switching noise. This noise component, however, is usually inaudible because it is well above 20 kHz. However, it can still contribute to speaker distortion. Signal-to-noise ratio is generally only shown within the range of 20 Hz to 20 kHz. For that reason, a lowpass filter is utilized while measuring cordless speaker amps to eliminate the switching noise.
Makers measure the signal-to-noise ratio by setting the built-in amplifier such that the full output swing may be realized and by feeding a test tone to the transmitter that is generally 60 dB underneath the full scale of the speaker amplifier. After that, the noise floor between 20 Hz and 20 kHz is measured and the ratio to the full-scale signal computed. The noise signal at other frequencies is eliminated via a bandpass filter throughout this measurement.
A different convention to express the signal-to-noise ratio uses more subjective terms. These terms are "dBA" or "A weighted". You will discover these terms in many wireless speaker spec sheets. This method tries to evaluate in how far the cordless speaker noise is perceived by human hearing which is most sensitive to signals at frequencies at 1 kHz. An A-weighted signal-to-noise ratio weighs the noise floor according to the human hearing and is generally larger than the unweighted signal-to-noise ratio.
As soon as you have selected a range of cordless loudspeakers, it's time to explore a few of the specifications in more detail in order to help you narrow down your search to one product. An important criterion of wireless loudspeakers is the signal-to-noise ratio. To put it simply, the signal-to-noise ratio describes how much hum or hiss the speakers will add to the music signal. This ratio is typically described in decibel or "db" for short.
You can perform a straightforward comparison of the wireless speaker noise by short circuiting the transmitter input, setting the speaker gain to maximum and listening to the speaker. You will hear some amount of hissing and/or hum coming from the loudspeaker. This hiss is produced by the cordless speaker itself. Make certain that the volume of each couple of wireless speakers is set to the same amount. Otherwise you will not be able to objectively compare the level of static between different models. The general rule is: the lower the amount of static that you hear the better the noise performance.
If you favor a pair of wireless loudspeakers with a small amount of hissing, you may look at the signal-to-noise ratio number of the data sheet. Most manufacturers will publish this figure. wireless speakers with a large signal-to-noise ratio will output a low level of noise. There are numerous reasons why wireless loudspeakers are going to add some form of hiss or other unwanted signal. Transistors and resistors which are part of each modern cordless loudspeaker by nature generate noise. The overall noise depends on how much hiss every component produces. Yet, the position of those components is also important. Components that are part of the speaker built-in amplifier input stage are going to normally contribute most of the noise.
The cordless broadcast itself also will cause hiss which is most noticable with types which utilize FM transmission at 900 MHz. The amount of static is also dependent upon the amount of wireless interference from other transmitters. Newer models are going to usually utilize digital music transmission at 2.4 GHz or 5.8 GHz. The signal-to-noise ratio of digital transmitters depends mostly on the kind of analog-to-digital converters and other components that are utilized in addition to the resolution of the wireless protocol.
A lot of modern wireless loudspeakers have built-in power amplifiers that incorporate a wattage switching stage which switches at a frequency around 500 kHz. Consequently, the output signal of wireless speaker switching amps contain a fairly large amount of switching noise. This noise component, however, is usually inaudible because it is well above 20 kHz. However, it can still contribute to speaker distortion. Signal-to-noise ratio is generally only shown within the range of 20 Hz to 20 kHz. For that reason, a lowpass filter is utilized while measuring cordless speaker amps to eliminate the switching noise.
Makers measure the signal-to-noise ratio by setting the built-in amplifier such that the full output swing may be realized and by feeding a test tone to the transmitter that is generally 60 dB underneath the full scale of the speaker amplifier. After that, the noise floor between 20 Hz and 20 kHz is measured and the ratio to the full-scale signal computed. The noise signal at other frequencies is eliminated via a bandpass filter throughout this measurement.
A different convention to express the signal-to-noise ratio uses more subjective terms. These terms are "dBA" or "A weighted". You will discover these terms in many wireless speaker spec sheets. This method tries to evaluate in how far the cordless speaker noise is perceived by human hearing which is most sensitive to signals at frequencies at 1 kHz. An A-weighted signal-to-noise ratio weighs the noise floor according to the human hearing and is generally larger than the unweighted signal-to-noise ratio.
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Title: Just How Do Producers Of Wireless Home Speakers Boost The Noise Performance?
Author: Linda Cullmann
Email: sales@amphony.com
Keywords: speakers,internet,computers,hardware,music,tv set,radio,technology,shopping,product reviews
Word Count: 675
Category: Computers
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