Nesar Digital Resources

What is Dynamic Range? Dynamic range is the ratio of the loudest (without distortion) signal to that of the quietest (discernible) signal in a piece of equipment or a complete system, expressed in decibels (dB). For sound systems, the maximum loudness level is what is achievable before acoustic feedback, or system squeal begins. While the…

How to calculate “dB” ? Decibel values can be calculated from any power measurements that use a common linear scale (e.g. Watts). In all cases they are derived from the ratio between two measurements, and in all cases they are calculated by finding the logarithm of the ratio, and multiplying it by ten*. The decibel can also be used to compare pressure measurements (e.g. Volts, or sound pressure),…

What is a decibel? A decibel is a tenth of a “Bel”, a unit of level. A Bel is a very large unit, so the prefix “deci” (one tenth) is used. Decibel uses a logarithmic scale, not a linear scale like volts or watts. It describes the ratio (change) between two values. In audio these…

In outdoor venues, the sound in the open air travels away from the source and keeps going until its energy is used up. But in indoor venues, there are walls and surfaces for the sound to bounce off and return to interfere with the primary sound. The listener will hear the primary sound and reflected…

The speed of sound is 343 m/s. For practical purpose the speed of sound can be considered as 1200 ft/s. It will take about 1ms (millisecond) for sound to travel a distance of 1 foot. For 50 feet it takes 50ms. Air is an elastic medium. Sound is a vibration which modifies the atmospheric pressure…

The human hearing range is said to be from 20 Hz to 20 Khz. It is called the Audio Spectrum. The range of human hearing is generally considered to be 20 Hz to 20 kHz, but it is far more sensitive to sounds between 1 kHz and 4 kHz. For example, listeners can detect sounds…