Audio frequency generator: Difference between revisions
Added Go
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Freq(F,10000)
End</lang>
=={{header|Go}}==
As Go does not have any audio support in its standard library, this invokes the SoX utility's 'play' command with the appropriate parameters to emulate an audio frequency generator. It appears that SoX automatically uses the internal speaker if there is no sound hardware available.
The duration of the monotone is set in advance (to a small number of seconds) and the application ends when it finishes playing. Consequently, a method to silence it is not required.
<lang go>package main
import (
"bufio"
"fmt"
"log"
"os"
"os/exec"
"strconv"
)
func check(err error) {
if err != nil {
log.Fatal(err)
}
}
func main() {
scanner := bufio.NewScanner(os.Stdin)
freq := 0
for freq < 40 || freq > 10000 {
fmt.Print("Enter frequency in Hz (40 to 10000) : ")
scanner.Scan()
input := scanner.Text()
check(scanner.Err())
freq, _ = strconv.Atoi(input)
}
freqS := strconv.Itoa(freq)
vol := 0
for vol < 1 || vol > 50 {
fmt.Print("Enter volume in dB (1 to 50) : ")
scanner.Scan()
input := scanner.Text()
check(scanner.Err())
vol, _ = strconv.Atoi(input)
}
volS := strconv.Itoa(vol)
dur := 0.0
for dur < 2 || dur > 10 {
fmt.Print("Enter duration in seconds (2 to 10) : ")
scanner.Scan()
input := scanner.Text()
check(scanner.Err())
dur, _ = strconv.ParseFloat(input, 64)
}
durS := strconv.FormatFloat(dur, 'f', -1, 64)
kind := 0
for kind < 1 || kind > 3 {
fmt.Print("Enter kind (1 = Sine, 2 = Square, 3 = Sawtooth) : ")
scanner.Scan()
input := scanner.Text()
check(scanner.Err())
kind, _ = strconv.Atoi(input)
}
kindS := "sine"
if kind == 2 {
kindS = "square"
} else if kind == 3 {
kindS = "sawtooth"
}
args := []string{"-n", "synth", durS, kindS, freqS, "vol", volS, "dB"}
cmd := exec.Command("play", args...)
err := cmd.Run()
check(err)
}</lang>
=={{header|Pure Data}}==
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