Data Interpolation and Its Effects on Digital Sound Quality - McMurry ...

More documents

Recommendations

Info

7audio conversion. Second, it has the advantage of having a great level of noisereduction/cancellation.Two other methods commonly used by DACs are upsampling <strong>and</strong>downsampling. These are done by simply increasing or decreasing the samplerate used by the ADC when it translated the analog to the digital. It is thesampling rate that the DAC uses for playback that gives the output bit rate of aparticular sound file (Kientzle 36). These methods are quicker <strong>and</strong> require lessprogramming code, but these methods don’t give the noise canceling capabilitythat oversampling gives.Note that the sampling rate converting back to analog from digital might bedifferent from the rate used to convert the original analog into digital. This canresult in major discrepancies between the original sound wave <strong>and</strong> the soundwave the DAC produces. Any of these discrepancies have a negative effect onthe overall sound quality.1.3 The WAVE File FormatThis thesis will primarily consider sound files that are stored in the WAVEformat. The WAVE file format was developed as the st<strong>and</strong>ard for storing audio onPCs by Microsoft <strong>and</strong> IBM.WAVE file formats are always stored using the method of placing the leastsignificant byte of information first in an array. This array is stored in memory asa string, which is a set of characters. This string contains indicators that point outsignificant notes, point labels, etc. that the audio player will need to recognize toplay the sound file correctly. (The Sonic Spot).
8The very clear advantage of WAVE files is that they support severaldifferent sampling rates, audio channels, <strong>and</strong> bit resolutions. Though they dotend to be rather large files, they are one of the most popular choices forrecording artists who record in digital sound. This thesis will take intoconsideration WAVE files that are equal to the CDA st<strong>and</strong>ard for compact discdigital audio, which use a sampling rate of 44.1 MHz (that is, 44,100 samples persecond).
Page 1: Data Inter
Page 6 and 7: 5aren’t close enough to capture t
Page 10 and 11: Chapter 2: Data <s
Page 12 and 13: 11It’s obvious from Figure 2.1.2
Page 14 and 15: 131 1 1L x x x x x x x28 3 212-.321
Page 16 and 17: 152.3.1 Example Suppose we want to
Page 18 and 19: 172.3.3 Example Let’s return to t
Page 20 and 21: 19put in perspective that it’s so
Page 22 and 23: 213.2 Lagrange ResultsFor our examp
Page 24 and 25: 23section, no sound wave is exactly
Page 26 and 27: 25However, in the very high harmoni
Page 28 and 29: 27AppendicesAppendix A: Program Hea
Page 30 and 31: 29namespace Maths{namespace <strong
Page 32 and 33: 31namespace Interpolation</
Page 34 and 35: 33double dx = x - m_x[1];return m_y

Data Interpolation and Its Effects on Digital Sound Quality - McMurry ...

Create successful ePaper yourself

Delete template?

Save as template?