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2. Pitch detection algorithm - Wikipedia

   en.wikipedia.org/wiki/Pitch_detection_algorithm

   Frequency domain, polyphonic detection is possible, usually utilizing the periodogram to convert the signal to an estimate of the frequency spectrum [4].This requires more processing power as the desired accuracy increases, although the well-known efficiency of the FFT, a key part of the periodogram algorithm, makes it suitably efficient for many purposes.

3. Frequency averaging - Wikipedia

   en.wikipedia.org/wiki/Frequency_averaging

   The musical note frequency calculation formula is used: F=(2^12/n)*440, where n equals the number of positive or negative steps away from the base note of A4(440 hertz) and F equals the frequency. The formula is used in calculating the frequency of each note in the piece. The values are then added together and divided by the number of notes.

4. Joplin (software) - Wikipedia

   en.wikipedia.org/wiki/Joplin_(software)

   Joplin is a free and open-source desktop and mobile note-taking and to-do list application written for Unix-like (including macOS and Linux) and Microsoft Windows operating systems, as well as iOS, Android, and Linux/Windows terminals, [2] written in JavaScript. The desktop app is made using Electron, while the mobile app uses React Native.

5. Simplenote - Wikipedia

   en.wikipedia.org/wiki/Simplenote

   Simplenote is a note-taking application with Markdown support. In addition to being accessible via most web browsers, [1] cross-platform apps are available on Android, Linux, Windows, iOS, and macOS.

6. Electronic tuner - Wikipedia

   en.wikipedia.org/wiki/Electronic_tuner

   This disc rotates at a fixed specific speed, set by the user. Each disc rotation speed is set to a particular frequency of the desired note. If the note being played (and making the lamps behind the disc flash) is at exactly the same frequency as the spinning of the disc, then the disc appears to be static from the strobing effect.

7. 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.

8. AOL Mail is free and helps keep you safe.

   mail.aol.com/?rp=webmail-std/en-us/basic

   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

9. Nimbus Note - Wikipedia

   en.wikipedia.org/wiki/Nimbus_Note

   Nimbus Note is a note-taking app designed by Nimbus Web company based in Cleveland, Ohio. The app is cross-platform , for Android , iOS , macOS , and Microsoft Windows . [ 1 ]