3/29/2024 0 Comments Decibel relative scale in negative![]() Loud things will go above the zero point. The term decibel can express an absolute value or a change in value (+1 dB or -1 dB). It is represented by dB and is widely used in signals, communication, and electronics. Most signals are below the nominal level so they appear as minuses. Can 'Negative' Decibels Exist Decibel Definition The decibel is used to measure sound levels. When you plug a device, whether a TV, console, or Bluray player, into a receiver, the device sends a signal to the receiver, and the. Instead of reflecting the actual volume of your speakers, these numbers represent the amplification factor. ![]() And like other people have said, it describes a value in relation to a reference value. It is also possible to have negative sound levels: - 20. The reason you see negative numbers concerning volume is because of the way certain receivers work. Simply put, negative decibels means numbers between 0 and 1, not numbers less than 0. So 0 dB does not mean no sound, it means a sound level where the sound pressure is equal to that of the reference level. That zero level should be the correct point at which the input signal will not be distorted at all and will give high fidelity reproduction with some headroom for cranking things up a little should you need to. 0 dB occurs when you take the log of a ratio of 1 (log 1 0). The ranges start off at minuses because the designer of the meter decided that a certain, nominal level was to be referenced to zero and the highest peak signal was to be x and the lowest signal visible to be y. Suppose a signal has an unmodulated-carrier power of P watts and a modulation signal power of P watts. The dBc increment is based on the decibel, a logarithm ic measure of relative signal strength. This gives you a more realistic measure of how your ears are going to perceive the sound in terms of it's loudness rather than the actual incident power on them. decibels relative to carrier (dBc): dBc (decibels relative to carrier) is a measure of the strength of an instantaneous signal at radio frequency. ![]() They average out the input signal smoothing it a bit so that it doesn't respond to the highest transient peaks. What they do, and do very well, is give you information about what level of signal you're putting into them and at what level you can expect distortion. VU meters do not give an accurate representation of power. I'll bet you it's really a VU meter (volume unit meter) and not a proper power meter. ![]()
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