Implementation of iOS Self-TTS technology: Voice broadcast

Text-to- speech technology , also known as TTS, is the abbreviation for text to speech. iOS uses this technique when it wants to do features like audio books .

One, there are several points to note when using iOS to bring TTS:

1. This function is only after iOS7
2. Need Avfoundation Library
3. Avspeechsynthesizer: Speech synthesizer, can be imagined as a person can speak, is the most important interface
4. Avspeechsynthesisvoice: Can imagine an adult's voice
5. Avspeechutterance: Can be imagined as a word to say

Two, code example, play voice

    //Voice BroadcastAvspeechutterance *utterance = [avspeechutterance speechutterancewithstring:@"The moonlight before the bed, is suspected to be ground frost. "]; Utterance.pitchmultiplier=0.8; //Chinese pronunciationAvspeechsynthesisvoice *voice = [Avspeechsynthesisvoice voicewithlanguage:@"ZH-CN"]; //English pronunciation//avspeechsynthesisvoice *voice = [Avspeechsynthesisvoice voicewithlanguage:@ "EN-GB"];Utterance.voice=Voice; NSLog (@"%@", [Avspeechsynthesisvoice speechvoices]); Avspeechsynthesizer*synth =[[Avspeechsynthesizer alloc]init]; [Synth speakutterance:utterance];

Three, Avspeechsynthesizer introduction

This class is like a talking person, can "speak", can "pause" to speak, can "continue" to speak, you can determine whether he is currently speaking. The following methods or properties are available:

• Talk: Speakutterance
• Control: Continuespeaking (continued), Pausespeakingatboundary (Pause speaking), paused (properties of the paused state), speaking (speaking state), Stopspeakingatboundary ( Stop talking)
• Commissioned by: Delegate

Four, Avspeechboundary Introduction

This is an enumeration. In the pause, or stop talking, the way to stop is marked with this enumeration. Two types are included:

• Avspeechboundaryimmediate: Stop Now
• Avspeechboundaryword: Say an entire word and stop.

Five, Avspeechsynthesizerdelegate Introduction

The delegate for the synthesizer, for some events, provides the interface for the response.

• Didcancelspeechutterance: I've canceled my speech.
• Didcontinuespeechutterance: has continued to speak
• Didfinishspeechutterance: Already finished.
• Didpausespeechutterance: Already paused
• Didstartspeechutterance: Already started
• Willspeakrangeofspeechstring: Going to say a word

Six, Avspeechsynthesisvoice Introduction

Avspeechsynthesisvoice defines a range of sounds, mainly in different languages and regions.

• Voicewithlanguage: Get a voice based on the language you've developed.
• Speechvoices: Get the sound supported by the current device
• Currentlanguagecode: Gets the language string of the current sound, such as "ZH-CN"
• Language: Getting the current language

Seven, Avspeechutterance Introduction

This class is the one thing to say. The main properties and methods are:

• Pitchmultiplier: Pitch
• Postutterancedelay: Pause time after reading a paragraph
• Preutterancedelay: Pause before reading a passage
• Rate: Reading speed, the system offers three speeds: avspeechutteranceminimumspeechrate, avspeechutterancemaximumspeechrate, Avspeechutterancedefaultspeechrate
• Speechstring: the string to read
• Voice: The sound used is the Avspeechsynthesisvoice object
• Volume: Volume

Eight, UML diagram

The relationships of these classes are as follows:

Implementation of iOS Self-TTS technology: Voice broadcast