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2. 44,100 Hz - Wikipedia

   en.wikipedia.org/wiki/44,100_Hz

   This sampling frequency is commonly used for MP3 and other consumer audio file ... lengths of digital audio. [note 2] ... to-analog converter capable of operating ...

3. Audio time stretching and pitch scaling - Wikipedia

   en.wikipedia.org/wiki/Audio_time_stretching_and...

   Alternatively, the frequency of the sinusoids in a sinusoidal model may be altered directly, and the signal reconstructed at the appropriate time scale. Transposing can be called frequency scaling or pitch shifting, depending on perspective. For example, one could move the pitch of every note up by a perfect fifth, keeping the tempo the same.

4. Piano key frequencies - Wikipedia

   en.wikipedia.org/wiki/Piano_key_frequencies

   The frequency of a pitch is derived by multiplying (ascending) or dividing (descending) the frequency of the previous pitch by the twelfth root of two (approximately 1.059463). [ 1 ] [ 2 ] For example, to get the frequency one semitone up from A 4 (A ♯ 4 ), multiply 440 Hz by the twelfth root of two.

5. Musical note - Wikipedia

   en.wikipedia.org/wiki/Musical_note

   In music, notes are distinct and ... While notes can have any arbitrary frequency, notes in more consonant music tends to have ... Converter: Frequencies to note name ...

6. A440 (pitch standard) - Wikipedia

   en.wikipedia.org/wiki/A440_(pitch_standard)

   A440 (also known as Stuttgart pitch [1]) is the musical pitch corresponding to an audio frequency of 440 Hz, which serves as a tuning standard for the musical note of A above middle C, or A 4 in scientific pitch notation. It is standardized by the International Organization for Standardization as ISO 16.

7. Advanced Audio Coding - Wikipedia

   en.wikipedia.org/wiki/Advanced_Audio_Coding

   The MP3 audio coding standard introduced in 1992 used ... number of time samples and convert them to frequency samples. ... download music in a closed-source ...

8. Sample-rate conversion - Wikipedia

   en.wikipedia.org/wiki/Sample-rate_conversion

   Audio on Compact Disc has a sampling rate of 44.1 kHz; to transfer it to a digital medium that uses 48 kHz, method 1 above can be used with L = 160, M = 147 (since 48000/44100 = 160/147). [5] For the reverse conversion, the values of L and M are swapped. Per above, in both cases, the low-pass filter should be set to 22.05 kHz.

9. Time–frequency analysis for music signals - Wikipedia

   en.wikipedia.org/wiki/Time–frequency_analysis...

   Figure 1 shows the waveform of an audio file "" with 44100 Hz sampling frequency. Figure 2 shows the time-frequency plot of the short-time Fourier transform (in particular, Gabor transform) results of the audio file. In this plot, horizontal lines with frequencies not greater than 230 Hz represent the fundamental frequencies while horizontal ...