Are you searching to buy a brand new a couple of cordless loudspeakers for your home? You may be dazzled by the amount of choices you have. In order to make an informed selection, it is best to familiarize yourself with popular terms. One of these terms is known as "signal-to-noise ratio" and is not frequently understood. I am going to help clarify the meaning of this term.
Once you have chosen a range of cordless loudspeakers, it is time to investigate a few of the specs in more detail in order to help you narrow down your search to one model. Every wireless loudspeaker is going to produce a certain level of hiss and hum. The signal-to-noise ratio is going to help quantify the level of static generated by the loudspeaker.
One technique to perform a simple test of the noise performance of a set of wireless loudspeakers is to short circuit the transmitter audio input and then to crank up the cordless speaker to its utmost. Then listen to the loudspeaker. You will hear some amount of hissing and/or hum coming from the loudspeaker. This hiss is produced by the wireless speaker itself. Then compare several sets of cordless loudspeakers according to the following rule: the smaller the level of hiss, the higher 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 different models.
In order to help you compare the noise performance, cordless speaker suppliers show the signal-to-noise ratio in their wireless loudspeaker specification sheets. Simply put, the larger the signal-to-noise ratio, the lower the level of noise the cordless loudspeaker creates. Noise is generated due to a number of factors. One factor is that today's cordless speakers all utilize elements including transistors in addition to resistors. These components are going to generate some amount of noise. Generally the elements which are situated at the input stage of the built-in power amplifier are going to contribute most to the overall noise. Consequently suppliers usually will pick low-noise components when developing the cordless speaker amplifier input stage.
The cordless broadcast itself also will cause hiss that is most noticable with models which make use of FM transmission at 900 MHz. Other cordless transmitters will interfer with FM type transmitters and result in additional static. Thus the signal-to-noise ratio of FM style wireless speakers changes depending on the distance of the loudspeakers from the transmitter and the amount of interference. To steer clear of these problems, modern transmitters use digital audio broadcast and usually transmit at 2.4 GHz or 5.8 GHz. The signal-to-noise ratio of digital transmitters depends by and large on the type of analog-to-digital converters and other parts which are used along with the resolution of the cordless protocol.
The majority of today's cordless loudspeakers use power amplifiers which are digital, also referred to as "class-d amps". Class-D amps use a switching stage which oscillates at a frequency in the range of 300 kHz to 1 MHz. This switching frequency is also hiss that is part of the amplified signal. Nonetheless, latest cordless speakerspecs typically only consider the noise between 20 Hz and 20 kHz.
Makers measure the signal-to-noise ratio by means of setting the built-in amplifier such that the full output swing may be realized and by feeding a test tone to the transmitter which is usually 60 dB below the full scale of the loudspeaker amplifier. Then, only the noise in the range of 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 power is computed and shown in db.
Frequently the signal-to-noise ratio is expressed in a more subjective manner as "dbA" or "A weighted". This technique was designed with the knowledge that human hearing perceives noise at different frequencies differently. Human hearing is most responsive to signals around 1 kHz. Then again, signals below 50 Hz and higher than 13 kHz are barely heard. The A-weighted signal-to-noise ratio is generally larger than the unweighted ratio and is shown in a lot of wireless speaker parameter sheets.
Once you have chosen a range of cordless loudspeakers, it is time to investigate a few of the specs in more detail in order to help you narrow down your search to one model. Every wireless loudspeaker is going to produce a certain level of hiss and hum. The signal-to-noise ratio is going to help quantify the level of static generated by the loudspeaker.
One technique to perform a simple test of the noise performance of a set of wireless loudspeakers is to short circuit the transmitter audio input and then to crank up the cordless speaker to its utmost. Then listen to the loudspeaker. You will hear some amount of hissing and/or hum coming from the loudspeaker. This hiss is produced by the wireless speaker itself. Then compare several sets of cordless loudspeakers according to the following rule: the smaller the level of hiss, the higher 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 different models.
In order to help you compare the noise performance, cordless speaker suppliers show the signal-to-noise ratio in their wireless loudspeaker specification sheets. Simply put, the larger the signal-to-noise ratio, the lower the level of noise the cordless loudspeaker creates. Noise is generated due to a number of factors. One factor is that today's cordless speakers all utilize elements including transistors in addition to resistors. These components are going to generate some amount of noise. Generally the elements which are situated at the input stage of the built-in power amplifier are going to contribute most to the overall noise. Consequently suppliers usually will pick low-noise components when developing the cordless speaker amplifier input stage.
The cordless broadcast itself also will cause hiss that is most noticable with models which make use of FM transmission at 900 MHz. Other cordless transmitters will interfer with FM type transmitters and result in additional static. Thus the signal-to-noise ratio of FM style wireless speakers changes depending on the distance of the loudspeakers from the transmitter and the amount of interference. To steer clear of these problems, modern transmitters use digital audio broadcast and usually transmit at 2.4 GHz or 5.8 GHz. The signal-to-noise ratio of digital transmitters depends by and large on the type of analog-to-digital converters and other parts which are used along with the resolution of the cordless protocol.
The majority of today's cordless loudspeakers use power amplifiers which are digital, also referred to as "class-d amps". Class-D amps use a switching stage which oscillates at a frequency in the range of 300 kHz to 1 MHz. This switching frequency is also hiss that is part of the amplified signal. Nonetheless, latest cordless speakerspecs typically only consider the noise between 20 Hz and 20 kHz.
Makers measure the signal-to-noise ratio by means of setting the built-in amplifier such that the full output swing may be realized and by feeding a test tone to the transmitter which is usually 60 dB below the full scale of the loudspeaker amplifier. Then, only the noise in the range of 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 power is computed and shown in db.
Frequently the signal-to-noise ratio is expressed in a more subjective manner as "dbA" or "A weighted". This technique was designed with the knowledge that human hearing perceives noise at different frequencies differently. Human hearing is most responsive to signals around 1 kHz. Then again, signals below 50 Hz and higher than 13 kHz are barely heard. The A-weighted signal-to-noise ratio is generally larger than the unweighted ratio and is shown in a lot of wireless speaker parameter sheets.
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