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  2. Step detection - Wikipedia

    en.wikipedia.org/wiki/Step_detection

    Bottom-up algorithms take the "opposite" approach to top-down methods, first assuming that there is a step in between every sample in the digital signal, and then successively merging steps based on some criteria tested for every candidate merge.

  3. Goertzel algorithm - Wikipedia

    en.wikipedia.org/wiki/Goertzel_algorithm

    The Goertzel algorithm is a technique in digital signal processing (DSP) for efficient evaluation of the individual terms of the discrete Fourier transform (DFT). It is useful in certain practical applications, such as recognition of dual-tone multi-frequency signaling (DTMF) tones produced by the push buttons of the keypad of a traditional analog telephone.

  4. Key derivation function - Wikipedia

    en.wikipedia.org/wiki/Key_derivation_function

    Example of a Key Derivation Function chain as used in the Signal Protocol.The output of one KDF function is the input to the next KDF function in the chain. In cryptography, a key derivation function (KDF) is a cryptographic algorithm that derives one or more secret keys from a secret value such as a master key, a password, or a passphrase using a pseudorandom function (which typically uses a ...

  5. Python (programming language) - Wikipedia

    en.wikipedia.org/wiki/Python_(programming_language)

    Since 7 October 2024, Python 3.13 is the latest stable release, and it and, for few more months, 3.12 are the only releases with active support including for bug fixes (as opposed to just for security) and Python 3.9, [55] is the oldest supported version of Python (albeit in the 'security support' phase), due to Python 3.8 reaching end-of-life.

  6. Cycle detection - Wikipedia

    en.wikipedia.org/wiki/Cycle_detection

    The key insight in the algorithm is as follows. If there is a cycle, then, for any integers i ≥ μ and k ≥ 0 , x i = x i + kλ , where λ is the length of the loop to be found, μ is the index of the first element of the cycle, and k is a whole integer representing the number of loops.

  7. Action (piano) - Wikipedia

    en.wikipedia.org/wiki/Action_(piano)

    In a typical hammer action keybed for a digital piano, as the key (1) is depressed, a cam (4) underneath the key presses on one end of a hammer (5), lifting the hammer weight (6) on the other end. The sensor(s) (7) in this case are placed to detect the motion of the hammer; sensors may be placed to detect key and/or hammer position, force, and ...

  8. Dynamic time warping - Wikipedia

    en.wikipedia.org/wiki/Dynamic_time_warping

    Dynamic time warping between two piecewise linear functions. The dotted line illustrates the time-warp relation. Notice that several points in the lower function are mapped to one point in the upper function, and vice versa. Two repetitions of a walking sequence recorded using a motion-capture system.

  9. Independent component analysis - Wikipedia

    en.wikipedia.org/wiki/Independent_component_analysis

    The key observation which leads to this algorithm is the sub-matrix of where =, corresponds to the unbiased observation matrix of hidden components that do not have connection to the -th monitor. Experimental results from [ 11 ] show that this approach is accurate under moderate noise levels.