Is there a standard for the frequencies and or duration used for beeps?
Is there a standard for the frequencies and or duration used for error or alert beeps?
When I hear a ding or bing sound, I sometimes find that the frequency of the tone is too high or low (in my opinion) for the intent. For example, a high pitch tone a second long indicates an error to me, whereas a lower tone and quicker bing sound indicates a message.
Another example is that my car makes the same repeated bing sound when I turn the ignition to remind me about an engine service as it does when the outside temperature is close to freezing or I've not fastened my seatbelt.
This is clearly subjective on my part. Are there any standards in use or defined, either within a limited field, or more widely adopted for the frequency and or duration of tones used to indicate errors, warnings, and informational messages?