It is easy to be confused by the terminology which wireless loudspeaker producers employ to explain the performance of their models. I am going to clarify the meaning of one frequently used specification: "signal-to-noise ratio" to help you make an informed choice whilst buying a brand new a set of wireless loudspeakers.
Whilst looking for a couple of wireless loudspeakers, you firstly are going to check the cost, wattage among additional basic criteria. Nonetheless, after this initial choice, you will still have numerous products to choose from. Now you will focus more on some of the technical specs, including signal-to-noise ratio and harmonic distortion. Every wireless loudspeaker is going to generate a certain amount of hiss as well as hum. The signal-to-noise ratio will help calculate the level of noise generated by the loudspeaker.
One way to do a straightforward check of the noise performance of a set of wireless speakers is to short circuit the transmitter audio input and then to crank up the cordless loudspeaker to its utmost. After that listen to the speaker. The static that you hear is created by the wireless speaker itself. Next compare different sets of wireless loudspeakers according to the next rule: the smaller the level of hiss, the higher the noise performance of the wireless speaker. Though, keep in mind that you have to set all sets of wireless loudspeakers to amplify by the same amount to evaluate different models.
If you favor a pair of wireless loudspeakers with a small amount of hissing, you may look at the signal-to-noise ratio figure of the data sheet. Many makers will display this number. cordless speakers with a high signal-to-noise ratio will output a small level of noise. There are several reasons why wireless speakers will add some form of hiss or other unwanted signal. Transistors and resistors which are part of every modern wireless speaker by nature create noise. Because the built-in power amplifier overall noise performance is mostly determined by the performance of components situated at the amplifier input, makers will attempt to pick low-noise components when developing the amp input stage of their cordless speakers.
The wireless broadcast itself also will cause static that is most noticable with products which make use of FM transmission at 900 MHz. FM transmitters are quite prone to wireless interference which is why newer models commonly utilize digital audio transmission. This kind of music 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 and the quality of other parts.
Most of recent wireless loudspeakers use power amps which are digital, also referred to as "class-d amplifiers". Class-D amplifiers make use of a switching stage that oscillates at a frequency in the range of 300 kHz to 1 MHz. This switching noise may cause some level of speaker distortion but is generally not included in the signal-to-noise ratio which merely considers noise in the range of 20 Hz and 20 kHz.
The signal-to-noise ratio is measured by feeding a 1 kHz test signal 60 dB underneath the full scale and measuring the noise floor of the signal generated by the built-in amp. The gain of the cordless loudspeaker is pair such that the full output power of the built-in amp can be achieved. Subsequently, the noise floor between 20 Hz and 20 kHz is measured and the ratio to the full-scale signal computed. The noise signal at different frequencies is eliminated by a bandpass filter during this measurement.
Frequently you will discover the term "dBA" or "a-weighted" in your cordless speaker parameter sheet. A weighting is a technique of expressing the noise floor in a more subjective way. This technique attempts to examine in how far the cordless speaker noise is perceived by human hearing which is most sensitive to signals at frequencies at 1 kHz. The A-weighted signal-to-noise ratio is frequently higher than the unweighted ratio and is published in most wireless speaker parameter sheets.
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Orignal From: A Quick Look At Exactly How Modern-Day Technology Reduces The Noise Of Portable Wireless Speakers
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