Generates a sound from the computer’s speaker.
SOUND frequency,duration
frequency is an integer expression (from 37 through 32,767) that specifies the sound’s frequency in hertz.
duration is an unsigned integer expression (from 0 through 65,535) that specifies the length of the sound in clock ticks. A clock tick occurs 18.2 times per second.
Values below .022 produce an infinite sound until the next SOUND or PLAY statement is executed.
If duration is zero, any active SOUND statement is turned off. If no SOUND statement is running, a duration of zero has no effect.
The following table shows the relationship of notes and their frequencies in the two octaves adjacent to middle C.
Table 5
Relationships of Notes and Frequencies
| Note | Frequency | Note | Frequency |
|---|---|---|---|
| C | 130.810 | C* | 523.250 |
| D | 146.830 | D | 587.330 |
| E | 164.810 | E | 659.260 |
| F | 174.610 | F | 698.460 |
| G | 196.000 | G | 783.990 |
| A | 220.000 | A | 880.000 |
| B | 246.940 | B | 987.770 |
| C | 261.630 | C | 1046.500 |
| D | 293.660 | D | 1174.700 |
| E | 329.630 | E | 1318.500 |
| F | 349.230 | F | 1396.900 |
| G | 392.000 | G | 1568.000 |
| A | 440.000 | A | 1760.000 |
| B | 493.880 | B | 1975.500 |
*Middle C.
By doubling or halving the frequency, the coinciding note values can be estimated for the preceding and following octaves.
To produce periods of silence, use the following statement:
SOUND 32767, duration
To calculate the duration of one beat, divide beats per minute into the number of clock ticks in a minute (1092).
The following table illustrates tempos requested by clock ticks:
Table 6
Tempos Requested by Clock Ticks
| Tempo | Notation | Beats/Minute | Ticks/Beat |
|---|---|---|---|
| very slow | Larghissimo | ||
| Largo | 40-66 | 27.3-18.2 | |
| Larghetto | 60-66 | 18.2-16.55 | |
| Grave | |||
| Lento | |||
| Adagio | 66-76 | 16.55-14.37 | |
| slow | Adagietto | ||
| Andante | 76-108 | 14.37-10.11 | |
| medium | Andantino | ||
| Moderato | 108-120 | 10.11-9.1 | |
| fast | Allegretto | ||
| Allegro | 120-168 | 9.1-6.5 | |
| Vivace | |||
| Veloce | |||
| Presto | 168-208 | 6.5-5.25 | |
| very fast | Prestissimo |
FOR i = 37 TO 3000
PRINT i
SOUND i, 1
NEXT i