1 files changed, 9 insertions, 1 deletions
diff --git a/client/lib/util.js b/client/lib/util.js
index 8696a50..5bf93dc 100644
--- a/client/lib/util.js
+++ b/client/lib/util.js
@@ -26,6 +26,7 @@ function mod(n, m) {
 function roundFreq(freq) {
   return Math.round(freq * 100);
 }
+const frequencyInRange = (freq) => 20 < freq && freq < 15000;
 
 function requestAudioContext(fn) {
   if (window.location.protocol !== "https:") {
@@ -70,4 +71,11 @@ function requestAudioContext(fn) {
   }
 }
 
-export { choice, mod, browser, roundFreq, requestAudioContext };
+export {
+  choice,
+  mod,
+  browser,
+  roundFreq,
+  frequencyInRange,
+  requestAudioContext,
+};