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  2. Washburn Guitars - Wikipedia

    en.wikipedia.org/wiki/Washburn_Guitars

    The 1974 range included one folk-style guitar (W-200) and eight dreadnoughts of increasing quality and decoration: W-240-12, W-250, W-260, W-280, W-300, W-300-12, W-500, W-600. Under Rudy Schlacher, most Washburn models were ordered in runs of 200 units, rather than ongoing production; if sales went well, further runs might be ordered.

  3. Continuous Tone-Coded Squelch System - Wikipedia

    en.wikipedia.org/wiki/Continuous_Tone-Coded...

    The most common set of supported tones is a set of 39 tones including all tones with Motorola PL codes, except for the tones 8Z, 9Z, and 0Z (zero-Z). [6] The lowest series has adjacent tones that are roughly in the harmonic ratio of 2 0.05 to 1 (≈1.035265), while the other two series have adjacent tones roughly in the ratio of 10 0.015 to 1 ...

  4. Roland GS - Wikipedia

    en.wikipedia.org/wiki/Roland_GS

    Roland GS, or just GS, sometimes expanded as General Standard [1] [2] or General Sound, [1] is a MIDI specification. It requires that all GS-compatible equipment must meet a certain set of features and it documents interpretations of some MIDI commands and bytes sequences, thus defining instrument tones, controllers for sound effects, etc.

  5. Line level - Wikipedia

    en.wikipedia.org/wiki/Line_level

    Voltage vs. time of sine waves at reference and line levels, with V RMS, V PK, and V PP marked for the +4dBu line level. A line level describes a line's nominal signal level as a ratio, expressed in decibels, against a standard reference voltage. The nominal level and the reference voltage against which it is expressed depend on the line level ...

  6. Equal-loudness contour - Wikipedia

    en.wikipedia.org/wiki/Equal-loudness_contour

    An equal-loudness contour is a measure of sound pressure level, over the frequency spectrum, for which a listener perceives a constant loudness when presented with pure steady tones. [1] The unit of measurement for loudness levels is the phon and is arrived at by reference to equal-loudness contours. By definition, two sine waves of differing ...

  7. Reference tone - Wikipedia

    en.wikipedia.org/wiki/Reference_tone

    In telecommunication, a standard test tone is a pure tone with a standardized level generally used for level alignment of single links and of links in tandem. [1]For standardized test signal levels and frequencies, see MIL-STD-188-100 for United States Department of Defense (DOD) use, and the Code of Federal Regulations Title 47, part 68 for other Government agencies.

  8. Tone contour - Wikipedia

    en.wikipedia.org/wiki/Tone_contour

    A tone in a contour-tone language which remains at approximately an even pitch is called a level tone. Tones which are too short to exhibit much of a contour, typically because of a final plosive consonant, may be called checked, abrupt, clipped, or stopped tones. It has been theorized that the relative timing of a contour tone is not distinctive.

  9. Precise tone plan - Wikipedia

    en.wikipedia.org/wiki/Precise_tone_plan

    Low tone, also busy tone, is defined as having frequency components of 480 and 620 Hz at a level of −24 dBm and a cadence of one half second ON and one half second OFF. Reorder tone, also often called fast busy tone, is the same tone, but with a cadence of 0.25 of a second ON and 0.25 of a second OFF. The original plan had two slightly ...