How to perform speech synthesis and speech recognition in PHP?

PHP (Hypertext Preprocessor) is a widely used server-side scripting language commonly used to develop web applications. In many web applications, speech synthesis and speech recognition are a very important function, and PHP also provides corresponding tools and libraries to implement these functions.

1. Speech synthesis

Text-To-Speech (TTS) is the process of converting text into speech. There are many libraries and tools in PHP that can implement speech synthesis. Here are some of the more commonly used libraries and tools.

1. Google Text-to-Speech API

Google Text-to-Speech API is an online API that can convert text into various speech types. To use this API, you need to first register an account on Google Cloud and create a new project. Enable the "Google Text-to-Speech API" in your project and download the "API Key" for calling the API.

The code example for calling Google Text-to-Speech API using PHP is as follows:

$text = "Hello, world.";
$url = "https://texttospeech.googleapis.com/v1/text:synthesize?key=[API_KEY]";
$data = array(
    "input" => array(
        "text" => $text
    ),
    "voice" => array(
        "languageCode" => "en-US",
        "name" => "en-US-Wavenet-D"
    ),
    "audioConfig" => array(
        "audioEncoding" => "MP3"
    )
);
$json = json_encode($data);

$curl = curl_init();
curl_setopt($curl, CURLOPT_URL, $url);
curl_setopt($curl, CURLOPT_POST, true);
curl_setopt($curl, CURLOPT_POSTFIELDS, $json);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
curl_setopt($curl, CURLOPT_HTTPHEADER, array(
    "Content-Type: application/json"
));
$result = curl_exec($curl);
curl_close($curl);

file_put_contents("output.mp3", $result);

2. Microsoft Speech SDK

Microsoft Speech SDK is provided by Microsoft A set of tools and libraries for speech recognition and speech synthesis. It supports a variety of speech synthesis engines, including Microsoft's own engine (Microsoft Speech Platform) and some other third-party engines.

The code example of using Microsoft Speech SDK to convert text into speech is as follows:

require 'vendor/autoload.php';

use MicrosoftCognitiveServicesSpeechSpeechConfig;
use MicrosoftCognitiveServicesSpeechSpeechSynthesizer;

// Replace with your own subscription key and region identifier
$key = "YourSubscriptionKey";
$region = "YourServiceRegion";

// Configure the synthesizer object
$speech_config = SpeechConfig::fromSubscription($key, $region);
$synthesizer = new SpeechSynthesizer($speech_config);

// Synthesize speech from text
$text = "Hello, world.";
$file_name = "output.wav";
$results = $synthesizer->speakText($text, $file_name);

// Output the speech file
header('Content-type: audio/wav');
echo file_get_contents($file_name);

2. Speech Recognition

Speech recognition (Speech Recognition, SR) is to convert speech into text process. There are also many libraries and tools in PHP that can implement speech recognition. Here are some of the more commonly used libraries and tools.

1. Google Cloud Speech-to-Text API

Google Cloud Speech-to-Text API is an online API that converts speech to text. To use this API, you need to first register an account on Google Cloud and create a new project. Enable "Google Cloud Speech-to-Text API" in the project and download the "API Key" for calling the API.

The code example for calling Google Cloud Speech-to-Text API using PHP is as follows:

$file_name = "audio.wav";
$file_content = file_get_contents($file_name);

$url = "https://speech.googleapis.com/v1/speech:recognize?key=[API_KEY]";
$data = array(
    "config" => array(
        "encoding" => "LINEAR16",
        "sampleRateHertz" => 16000,
        "languageCode" => "en-US"
    ),
    "audio" => array(
        "content" => base64_encode($file_content)
    )
);
$json = json_encode($data);

$curl = curl_init();
curl_setopt($curl, CURLOPT_URL, $url);
curl_setopt($curl, CURLOPT_POST, true);
curl_setopt($curl, CURLOPT_POSTFIELDS, $json);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
curl_setopt($curl, CURLOPT_HTTPHEADER, array(
    "Content-Type: application/json"
));
$result = curl_exec($curl);
curl_close($curl);

$obj = json_decode($result);
if (isset($obj->results)) {
    $text = $obj->results[0]->alternatives[0]->transcript;
    echo $text;
}

2. Wit.ai

Wit.ai is an online A speech recognition platform that converts speech into text and other data. Its API is more intelligent than other speech recognition APIs and can recognize intents and entities. To use this API, you need to first register an account on Wit.ai and create a new application. Enable Speech API in your app and get an API key and app ID.

The code example for calling Wit.ai Speech API using PHP is as follows:

$file_name = "audio.wav";
$file_content = file_get_contents($file_name);

$url = "https://api.wit.ai/speech?v=20211006";
$data = $file_content;

$curl = curl_init();
curl_setopt($curl, CURLOPT_URL, $url);
curl_setopt($curl, CURLOPT_POST, true);
curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
curl_setopt($curl, CURLOPT_HTTPHEADER, array(
    "Authorization: Bearer [API_KEY]",
    "Content-Type: audio/wav"
));
$result = curl_exec($curl);
curl_close($curl);

$obj = json_decode($result);
if (isset($obj->_text)) {
    $text = $obj->_text;
    echo $text;
}

Summary

By using the above tools and libraries, speech synthesis and speech synthesis can be easily implemented in PHP Voice recognition function. They can help us quickly build more intelligent and interactive web applications and are one of the important tools for web development.

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