Training
How do you train English pronunciation with a fixed phrase?
Training here means repeating the same reference phrase and reading the tape, not “chatting into the mic”. the free tool asks for the text and the audio, aligns the phones, and returns overallScore, sentence, word and phoneme Phone PCC 0.682 against human consensus 0.555 is the published ruler at /aprender/pcc.
How to do it in three steps
Pick a phrase you will actually repeat all week. Without a fixed phrase there is no meter: there is transcription. Forced alignment locks each phone to that reference.
- Type the English phrase. Record on the microphone or send a file up to 8 MB, between 0.5 s and 60 s. Mic at 15–30 cm, room above 15 dB.
- Read overallScore and the colour per word. A word below 50 hides a phoneme in 0–39 or 40–59. Open the phones.
- Repeat only the bad stretch. If confidence falls under 0.5, the take is void: dirty audio or a different phrase. Discard and record again. Guide: /aprender/medir-pronuncia.
What to expect: formats, size and time
Audio up to 8 MB and 60 s on this free page. Preference for 16 kHz. Page allowance. No free conversation: the reference phrase is the contract.
We do not publish a student hit-rate percentage. The numbers on the page are the guide tokens: bands 80–100, 60–79, 40–59, 0–39. Proof at /aprender/pcc.
When to use the paid API
When each class lesson yields a score without the teacher's tab. The API scores the audio against the phrase. /products and /pricing. Series: /aprender.
One phrase today: free page. Class, lesson, disk: API.
Frequently asked questions
Can I train free speech, with no text?
No. Without a reference phrase the engine does not meter the phone. Type what you meant to say.
Which number do I watch in training?
overallScore and the per-word tape. Confidence under 0.5 discards the take. Detail at /aprender/quatro-niveis.
How much audio fits?
Up to 60 s and 8 MB on this page. A short stretch of the phrase, not the whole lesson.