Question

I’m working on a voice-controlled program for iOS and using Pocketsphinx as my recognition engine. I want it to recognize whether a spoken command contains the word “Morning” and respond with one of the phrases in the morningGreetings array. My code looks like this-

if([hypothesis rangeOfString:@"morning"].location == !NSNotFound) {
    NSString *text= [morningGreetings objectAtIndex:arc4random() % [morningGreetings count]];;
    [self.fliteController say:[NSString stringWithFormat:text] withVoice:self.firstVoiceToUse];
}

However, with this code the recognizer only exectues the command if “Morning” is the FIRST word in the spoken string. I want it to respond to “Good morning”, “Nice morning, isn’t it”, “How are you this morning?”, etc. What can I change to achieve this?

Answer 1

I want it to recognize whether a spoken command contains the word “Morning” (…) However, with this code the recognizer only exectues the command if “Morning” is the FIRST word in the spoken string.

Your condition location == !NSNotFound is equivalent to location == 0 because !NSNotFound equals 0, therefore it only executes if “morning” is the first word in the string. What you want is location != NSNotFound.

Change the condition like so:

if ([hypothesis rangeOfString:@"morning"].location != NSNotFound) { ... }