AQuA Music – testing quality of music and other audio files
AQuA for music quality testing is basically the same AQuA Wideband product, which is devoted to testing perceptual audio signal quality. Further down we would like to show incomplete set of possible examples, which shows explicitly the benefits when using AQuA for testing quality of sound signals containing music or other kind of wideband audio.
When considering digital recording and digital playback sound quality depends on the range of sound signal, the rate at which it is sampled, and various conversions that occur in sound reproduction system. In lossy codecs like MP3, sound quality is a factor that determines how much of the sound signal data the encoder is allowed to loose in order to reduce file size. In MP3-encoded signals for instance the quality is defined by its bitrate, in kilobits per second (kbit/s).
The frequency range of sound (in Hertz) which equipment is capable to sample and reproduce affects sound quality. Humans can hear frequencies ranging from about 20 Hz to approximately 20 kHz, so sampling that does not extend far enough will take effect on the sound quality.
Sound signal wave is continuous and has some real value at every instant. The digital quantization of the analogue sound wave means that much of the continuous sound wave is not recorded. The rate at which the sound is sampled refers to the amount of information the detection equipment records for each second of the sound. The higher the sampling frequency, the more accurate the final samples will be. However, there is a mathematical proof that in order to preserve all frequencies in the original sound it’s enough that the sampling frequency is two times higher than the highest frequency in the sound signal spectrum. Thus for example when dealing with speech one can easily use sampling frequency of 8kHz, because human speech spectrum is limited by 3.4kHz.
Test the quality of your MP3 encoders, choose the best one for your audio archives, compare two audio files and do much more with AQuA Music (AQuA Wideband)!
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