barcode scanner sdk vb.net notes The exact frequencies are the 12th root of 2 apart. in Software

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notes The exact frequencies are the 12th root of 2 apart.
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The 12th root of 2 is 1.05946309. A4 is now standardized at 440 Hz. The standard has varied from about 420 to 450 Hz over the last three centuries. The code segment shown in Program 17-1 will generate a 440 cps note (10,000,000/ (440*2)=11,364).
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Program 17-1 Code Segment for an A4 Note
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dira[output]~~ repeat !OUTA[output] waitcnt(11_364 +cnt)
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'output pin 'loop 'toggle output line 'wait for the A4 freq
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Creating audible FrequenCies
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We need to generate this tone for about a quarter second and then go on to the next tone. We can repeat this code for as many tones as we need as shown in the preceding program segment. This code is incorporated into Program 17-2.
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Program 17-2 Code for Generating Audible Tones
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{{12 Sep 09 Harprit Sandhu Play8Notes.spin Propeller Tool Ver. 1.2.6 17 Program 2 This program plays 8 notes, bare bones. Define the constants we will use. }} CON _CLKMODE=XTAL1 + PLL2X _XINFREQ = 5_000_000 repfactor =500 delayfact =1_000_000 output = 25 PUB Go dira[output]~~ repeat repeat repfactor !OUTA[output] waitcnt(13_636 +cnt) waitcnt(delayfact+cnt) repeat repfactor !OUTA[output] waitcnt(12_170 +cnt) waitcnt(delayfact+cnt) repeat repfactor !OUTA[output] waitcnt(11470 +cnt) waitcnt(delayfact+cnt) repeat repfactor !OUTA[output] waitcnt(10221 +cnt) waitcnt(delayfact+cnt) repeat repfactor !OUTA[output] waitcnt(9104 +cnt) waitcnt(delayfact+cnt)
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'The system clock spec 'the crystal frequency 'number of times repeated 'delay between notes
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'output pin 'outer loop 'toggle output line 'wait to synthesize freq 'wait 'toggle output line 'wait to synthesize freq 'wait 'toggle output line 'wait to synthesize freq 'wait 'toggle output line 'wait to synthesize freq 'wait 'toggle output line 'wait to synthesize freq 'wait (continued)
Creating and reading FrequenCies
Program 17-2
Code for Generating Audible Tones (continued)
repeat repfactor !OUTA[output] waitcnt(8595 +cnt) waitcnt(delayfact+cnt) repeat repfactor !OUTA[output] waitcnt(7639 +cnt) waitcnt(delayfact+cnt) repeat repfactor !OUTA[output] waitcnt(6818 +cnt) waitcnt(delayfact+cnt) note
'toggle output line 'wait to synthesize freq 'wait 'toggle output line 'wait to synthesize freq 'wait 'toggle output line 'wait to synthesize freq 'wait
When you run this code within a program, you will notice that the higher frequency notes run for shorter times than the lower frequencies. The reason for this is that the time between the toggles shortens and the notes get done sooner as the frequency increases. (We created eight notes to make sure that we would notice the decrease in the note duration.) This requires that the repeat factor for each note be dependent on the delay between toggles for that specific note. Also note that the duration of each note is not affected by the toggling instruction time or the general program flow (in that each repeating sequence is identical), so if you were in need of an exactly timed sequence, this too would have to be taken into consideration. Think about how you would make each succeeding note play for the same duration.
We need to be able to read a potentiometer so that we can use the value read to set the eight frequencies we want to play. We will do this with a routine in the Utilities object. The program will use three cogs, assigned as follows:
Main cog Read the potentiometer, read data, and calculate values Cog two Display LCD information, the tone played, and the potentiometer value Cog three Play the selected note
The creation of multiple cogs was covered in detail in Part I of the book. The data we need is added to the program with the following code in a DAT block:
DAT Tone word 440, 494, 523, 587, 659, 698, 784, 880
The data is read from within the program with the following code:
PUB GetTone | Tone NoteFreq := Tone[toneNumber]
Creating audible FrequenCies
Next, we ll put everything together in Program 17-3, which plays eight frequencies based on the position of the potentiometer and displays what is happening on the LCD.
Program 17-3 Generating and Displaying Eight Frequencies with Three Cogs
{{ Aug 31 09 Harprit Sandhu FreqGen8.Spin Propeller Tool Ver. 1.2.6 17 Program 3 This program generates 8 frequencies starting at 440 cycles/sec. Depends on the position of Pot 1 }} CON _CLKMODE=XTAL1+ PLL2X _XINFREQ = 5_000_000 Output = 26 Repfactor = 100
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