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SM1124 Datenblatt(PDF) 7 Page - Nippon Precision Circuits Inc |
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SM1124 Datenblatt(HTML) 7 Page - Nippon Precision Circuits Inc |
7 / 10 page SM1124 Series NIPPON PRECISION CIRCUITS—7 Musical Specifications Maximum program steps The mask for the built-in ROM can be programmed with up to a maximum of 512 steps, where each step represents either a note (sound pitch and length) or a rest. Note length (including rests) Eight rhythm values for notes (rests) can be programmed. Also, 2 or more notes can be programmed as tied notes using a tie. Pitch and scale The SM1124 performs uniform interval length processing to reduce the error at high pitches. This maintains the relative phase when the frequency varies from the input value. The pitch varies with the external reference clock frequency, as shown in the frequency on the following page. The frequency variation from the input frequency is the sum of the relative error, shown in the frequency table, plus the pitch error. (Ex) 38.4 kHz system, A4 note Relative error: 8.99 cent Pitch error: −3.58 cent Total: +5.41 cent Error calculation method: 01234567 3 3 Rest Note 3 3 1200 log 2 Output frequency Reference frequency ------------------------------------------------- × 1200 log 10 Output frequency Reference frequency ------------------------------------------------- log 102 --------------------------------------------------------------- × = 3986.3 log 10 Output frequency Reference frequency ------------------------------------------------- × ≈ 3986.3 log 10 441.379 440.000 ------------------- × ≈ 5.41 cent ≈ |
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