Common Voice is a great project that I’m glad Mozilla kept alive.
One problem is that data for speech recognition needs to be extremely accurate (i.e. the speech matches the transcript perfectly) and the human review process is infallible and there are quite a number of bad clips that made it past the review process (to be fair, Mozilla provides no official guidance to reviewers or recorders).
Plus in the early days, they were recording the same small sentence pool over and over again, so the first 700 hours or so are duplicates.
I hope there will be efforts in the future to clean up the existing dataset to improve its quality.
One problem is that data for speech recognition needs to be extremely accurate (i.e. the speech matches the transcript perfectly) and the human review process is infallible and there are quite a number of bad clips that made it past the review process (to be fair, Mozilla provides no official guidance to reviewers or recorders).
Plus in the early days, they were recording the same small sentence pool over and over again, so the first 700 hours or so are duplicates.
I hope there will be efforts in the future to clean up the existing dataset to improve its quality.