Are you looking to buy a new a set of wireless loudspeakers for your home? You might be dazzled by the amount of options you have. In order to make an informed choice, it is best to familiarize yourself with common terms. One of these specifications is referred to as "signal-to-noise ratio" and is not often understood. I am going to help explain the meaning of this expression.
When trying to find a set of cordless speakers, you firstly are going to check the price, power amid additional basic criteria. Nonetheless, after this initial choice, you will still have several products to choose from. Next you are going to focus more on several of the technical specs, like signal-to-noise ratio and harmonic distortion. An important parameter of wireless speakers is the signal-to-noise ratio. To put it simply, the signal-to-noise ratio describes how much hum or hiss the speakers are going to add to the music signal. This ratio is commonly described in decibel or "db" for short.
Comparing the noise level of different sets of cordless loudspeakers may be accomplished quite simply. Simply get together a couple of versions which you wish to compare and short circuit the transmitter audio inputs. Afterward set the cordless loudspeaker volume to maximum and check the level of static by listening to the speaker. Typically you are going to hear two components. The first is hissing. In addition, you are going to often hear a hum at 50 or 60 Hz. Both of these are components which are produced by the wireless loudspeaker itself. Ensure that the gain of each pair of cordless speakers is couple to the same amount. Otherwise you will not be able to objectively evaluate the amount of hiss between different models. The general rule is: the lower the level of noise that you hear the better the noise performance.
In order to help you evaluate the noise performance, wireless speaker suppliers publish the signal-to-noise ratio in their wireless loudspeaker spec sheets. Simply put, the larger the signal-to-noise ratio, the lower the amount of noise the wireless speaker creates. There are several 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 wireless speaker by nature create noise. Given that the built-in power amplifier overall noise performance is mostly determined by the performance of elements located at the amp input, makers will try to select low-noise components while developing the amp input stage of their cordless speakers.
The wireless broadcast itself also creates hiss that is most noticable with types which use FM transmission at 900 MHz. The level of noise is also dependent upon the level of wireless interference from other transmitters. Modern products are going to normally make use of digital audio broadcast at 2.4 GHz or 5.8 GHz. This type of audio broadcast offers higher signal-to-noise ratio than analog type transmitters. The level of hiss is dependent on the resolution of the analog-to-digital converters as well as the quality of other components.
The majority of of today's cordless loudspeaker use amplifiers which are based on a digital switching architecture. These amplifiers are named "class-D" or "class-T" amps. Switching amps incorporate a power stage that is constantly switched at a frequency of around 400 kHz. Consequently, the output signal of cordless speaker switching amplifiers contain a fairly large level of switching noise. This noise component, however, is usually inaudible since it is well above 20 kHz. Yet, it may still contribute to loudspeaker 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 when measuring wireless loudspeaker amps to eliminate the switching noise.
Manufacturers measure the signal-to-noise ratio by means of setting the built-in amplifier such that the full output swing can be achieved and by inputting a test tone to the transmitter which is normally 60 dB below the full scale of the speaker amplifier. Subsequently, only the hiss in the range of 20 Hz and 20 kHz is considered. The noise at other frequencies is eliminated by a filter. Subsequently the amount of the noise energy in relation to the full-scale output power is calculated and shown in decibel.
A different convention to state the signal-to-noise ratio uses more subjective terms. These terms are "dBA" or "A weighted". You are going to spot these terms in most cordless speaker parameter sheets. In other words, this method tries to express how the noise is perceived by a human. Human hearing is most sensitive to signals around 1 kHz while signals under 50 Hz and above 14 kHz are hardly heard. An A-weighted signal-to-noise ratio weighs the noise floor according to the human hearing and is normally higher than the unweighted signal-to-noise ratio.
When trying to find a set of cordless speakers, you firstly are going to check the price, power amid additional basic criteria. Nonetheless, after this initial choice, you will still have several products to choose from. Next you are going to focus more on several of the technical specs, like signal-to-noise ratio and harmonic distortion. An important parameter of wireless speakers is the signal-to-noise ratio. To put it simply, the signal-to-noise ratio describes how much hum or hiss the speakers are going to add to the music signal. This ratio is commonly described in decibel or "db" for short.
Comparing the noise level of different sets of cordless loudspeakers may be accomplished quite simply. Simply get together a couple of versions which you wish to compare and short circuit the transmitter audio inputs. Afterward set the cordless loudspeaker volume to maximum and check the level of static by listening to the speaker. Typically you are going to hear two components. The first is hissing. In addition, you are going to often hear a hum at 50 or 60 Hz. Both of these are components which are produced by the wireless loudspeaker itself. Ensure that the gain of each pair of cordless speakers is couple to the same amount. Otherwise you will not be able to objectively evaluate the amount of hiss between different models. The general rule is: the lower the level of noise that you hear the better the noise performance.
In order to help you evaluate the noise performance, wireless speaker suppliers publish the signal-to-noise ratio in their wireless loudspeaker spec sheets. Simply put, the larger the signal-to-noise ratio, the lower the amount of noise the wireless speaker creates. There are several 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 wireless speaker by nature create noise. Given that the built-in power amplifier overall noise performance is mostly determined by the performance of elements located at the amp input, makers will try to select low-noise components while developing the amp input stage of their cordless speakers.
The wireless broadcast itself also creates hiss that is most noticable with types which use FM transmission at 900 MHz. The level of noise is also dependent upon the level of wireless interference from other transmitters. Modern products are going to normally make use of digital audio broadcast at 2.4 GHz or 5.8 GHz. This type of audio broadcast offers higher signal-to-noise ratio than analog type transmitters. The level of hiss is dependent on the resolution of the analog-to-digital converters as well as the quality of other components.
The majority of of today's cordless loudspeaker use amplifiers which are based on a digital switching architecture. These amplifiers are named "class-D" or "class-T" amps. Switching amps incorporate a power stage that is constantly switched at a frequency of around 400 kHz. Consequently, the output signal of cordless speaker switching amplifiers contain a fairly large level of switching noise. This noise component, however, is usually inaudible since it is well above 20 kHz. Yet, it may still contribute to loudspeaker 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 when measuring wireless loudspeaker amps to eliminate the switching noise.
Manufacturers measure the signal-to-noise ratio by means of setting the built-in amplifier such that the full output swing can be achieved and by inputting a test tone to the transmitter which is normally 60 dB below the full scale of the speaker amplifier. Subsequently, only the hiss in the range of 20 Hz and 20 kHz is considered. The noise at other frequencies is eliminated by a filter. Subsequently the amount of the noise energy in relation to the full-scale output power is calculated and shown in decibel.
A different convention to state the signal-to-noise ratio uses more subjective terms. These terms are "dBA" or "A weighted". You are going to spot these terms in most cordless speaker parameter sheets. In other words, this method tries to express how the noise is perceived by a human. Human hearing is most sensitive to signals around 1 kHz while signals under 50 Hz and above 14 kHz are hardly heard. An A-weighted signal-to-noise ratio weighs the noise floor according to the human hearing and is normally higher than the unweighted signal-to-noise ratio.
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