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    <p>Yes it is possible. Here is a little research and resources to get you started. Seems like you have your work cut out for you.</p> <h1>General API</h1> <ul> <li><a href="https://www.twilio.com/" rel="nofollow noreferrer">https://www.twilio.com/</a></li> <li><a href="https://www.tropo.com/" rel="nofollow noreferrer">https://www.tropo.com/</a></li> </ul> <h1>PHP Voice</h1> <ul> <li><a href="http://freecode.com/projects/phpvoice" rel="nofollow noreferrer">http://freecode.com/projects/phpvoice</a></li> </ul> <blockquote> <p>PHP Voice (formerly known as PHP VXML) contain four classes that assist in developing voice application using PHP. It supports Speech Synthesis Markup Language 1.0, Speech Recognition Grammar Specification 1.0, Voice Browser Call Control: CCXML 1.0, and Voice Extensible Markup Language (VoiceXML) 2.0.</p> </blockquote> <h2>VoicePHP</h2> <ul> <li><a href="http://voicephp.com/" rel="nofollow noreferrer">http://voicephp.com/</a></li> <li><a href="http://code.voicephp.com/" rel="nofollow noreferrer">http://code.voicephp.com/</a></li> </ul> <blockquote> <p>In simple terms, it’s the same old PHP which now enables you to create voice applications.</p> <p>It’s not an extension to PHP; infact it’s the same PHP which now outputs voice instead of text and also takes input as voice instead of text. In technical terms, it’s PHP whose standard text based input &amp; output (stdio, stdout in programmer’s term) are replaced by voice equivalent.</p> </blockquote> <h2>Savana AQuA - Audio Quality Analyzer</h2> <ul> <li><a href="http://www.sevana.fi/voice_quality_testing_measurement_analysis.php" rel="nofollow noreferrer">http://www.sevana.fi/voice_quality_testing_measurement_analysis.php</a></li> </ul> <blockquote> <p>AQuA is a simple but powerful tool to provide perceptual voice quality testing and audio file comparison in terms of audio quality. This is the easiest way to compare two audio files and test voice quality between original and degraded files.</p> </blockquote> <h2>Savana Audio Codecs Quality Analyzer</h2> <ul> <li><a href="http://www.sevana.fi/audio_speech_codecs_quality_analysis.php" rel="nofollow noreferrer">http://www.sevana.fi/audio_speech_codecs_quality_analysis.php</a></li> </ul> <blockquote> <p><a href="http://en.wikipedia.org/wiki/Vocoder" rel="nofollow noreferrer">From wikipedia</a>: A vocoder is an analysis/synthesis system, used to reproduce human speech. In the encoder, the input is passed through a multiband filter, each band is passed through an envelope follower, and the control signals from the envelope followers are communicated to the decoder. The decoder applies these (amplitude) control signals to corresponding filters in the synthesizer. Since the control signals change only slowly compared to the original speech waveform, the bandwidth required to transmit speech can be reduced. This allows more speech channels to share a radio circuit or submarine cable. By encoding the control signals, voice transmission can be secured against interception.</p> </blockquote> <h2>MASLE: Machine-Aided Spoken Language Evaluation</h2> <ul> <li><a href="http://masle.org/" rel="nofollow noreferrer">http://masle.org/</a></li> <li><a href="http://moodle.org/mod/forum/discuss.php?d=124690" rel="nofollow noreferrer">http://moodle.org/mod/forum/discuss.php?d=124690</a></li> </ul> <blockquote> <p>The MASLE project has the goal of creating a series of tools for the evaluation of spoken language over the internet.This evaluation will be performed by automatic speech recognition software as well as by human raters.</p> </blockquote> <h2>The NanoGong Applet</h2> <ul> <li><a href="http://gong.ust.hk/features_nano.html" rel="nofollow noreferrer">http://gong.ust.hk/features_nano.html</a></li> <li><a href="http://nanogong.ust.hk/" rel="nofollow noreferrer">http://nanogong.ust.hk/</a></li> <li><a href="http://moodle.org/mod/forum/discuss.php?d=128465" rel="nofollow noreferrer">http://moodle.org/mod/forum/discuss.php?d=128465</a></li> </ul> <blockquote> <p>NanoGong is an applet that can be used by someone to record, playback and save their voice, in a web page. When the recording is played back the user can speed up or slow down the sound without changing it. The applet can be used on a web page or as an integrated component in Moodle.</p> </blockquote>
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