Data processing: speech signal processing – linguistics – language – Speech signal processing – Recognition
Reexamination Certificate
2002-09-13
2004-05-11
Dorvil, Richemond (Department: 2654)
Data processing: speech signal processing, linguistics, language
Speech signal processing
Recognition
C704S231000, C704S235000, C704S251000, C704S254000, C704S503000, C704S260000, C704S270000
Reexamination Certificate
active
06735565
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to a correction device for correcting a text recognized by a speech recognition device for a spoken text, where the recognized text for spoken words of the spoken text includes correctly recognized words and incorrectly recognized words.
The invention further relates to a correction method for correcting a text recognized by a speech recognition device for a spoken text, where the recognized text for spoken words of the spoken text includes correctly recognized words and incorrectly recognized words.
BACKGROUND OF THE INVENTION
Such a correction device and such a correction method are known from the document U.S. Pat. No. 5,909,667, in which a dictation device is disclosed. The known dictation device is formed by a computer which operates speech recognition software and word-processing software. A user of the known dictation device can speak a text into a microphone connected to the computer. The speech recognition software forming a speech recognition facility assigns a known word to each spoken word of the spoken text, by which means a recognized text is obtained for the spoken text. The recognized text contains so-called correctly recognized words, which match the words that the user actually spoke, and so-called incorrectly recognized words, which do not match the words that the user actually spoke. The recognized text is presented on a screen connected to the computer, by the word-processing software forming a word-processing facility.
The known dictation device also forms a correction device, which contains both the word-processing software and the speech recognition software, and with which incorrectly recognized words can be replaced with correction words. For this purpose, the user marks the incorrectly recognized word, inputs the correction word or words with a keyboard of the computer, and then enters a confirmation, causing the marked incorrectly recognized word to be replaced by the input correction word.
To simplify the marking of the incorrectly recognized word to be replaced, the user of the known dictation device can speak the incorrectly recognized word to be replaced—a so-called marker word—into the microphone once again. The speech recognition software thereupon recognizes a recognized marker word for this spoken marker word, and the word-processing software searches for the recognized marker word in the words of the recognized text. If the recognized marker word is found through a comparison of letter sequences of words in the recognized text, the word-processing device will mark this marker word. After speaking the marker word, the user must check whether the word to be replaced was actually marked. If this is the case, the user inputs the correction word and a confirmation using the keyboard, to implement the replacement.
With the known dictation device, the disadvantage has emerged that it is precisely those incorrectly recognized words contained in the recognized text which are difficult for the speech recognition software to recognize, so that a high error rate also occurs in the recognition of marker words. As a result, other words of the recognized text information rather than the incorrectly recognized words are relatively often marked for replacement, which means additional work. A further disadvantage of the known dictation device has emerged in that the user must execute relatively many different actions (microphone and keyboard) in order to replace an incorrectly recognized word.
BRIEF SUMMARY OF THEINVENTION
It is an object of the invention to create a correction device as specified in the first paragraph and a correction method as specified in the second paragraph in which the aforementioned disadvantages are avoided.
To achieve the above object, inventive features are provided in such a correction device so that the correction device can be characterized in the following way. A correction device for correcting a text recognized by a speech recognition device for a spoken text, where the recognized text for spoken words of the spoken text includes correctly recognized words and incorrectly recognized words, with
input means for receiving at least one manually input correction word in order to replace at least one of the incorrectly recognized words with at least one correction word, and with
transcription means for phonetic transcribing of at least the input correction word into a phoneme sequence, and with
search means for finding the phoneme sequence of the at least one correction word in phoneme sequences of the words of the recognized text and for issuing position information which identifies the position of at least one word within the recognized text whose phoneme sequence essentially matches the phoneme sequence of the at least one correction word, and with
output means for issuing the position information so as to enable a marking of the at least one word identified by the position information in the recognized text information.
To achieve the above object, inventive features are provided in such a correction method so that the correction method can be characterized in the following way.
A correction method for correcting a text recognized by a speech recognition device for a spoken text, where the recognized text for spoken words of the spoken text includes correctly recognized words and incorrectly recognized words, the following steps being processed:
receiving at least one manually entered correction word so as to replace at least one of the incorrectly recognized words with at least one correction word;
phonetically transcribing at least the input correction word into a phoneme sequence;
searching for the phoneme sequence of the at least one correction word in phoneme sequences of the words of the recognized text and issuing position information which identifies the position of at least one word within the recognized text whose phoneme sequence essentially matches the phoneme sequence of the at least one correction word;
issuing the position information so as to enable a marking of the at least one word identified by the position information in the recognized text information.
The invention is based on the recognition that the words incorrectly recognized by a speech recognition device and the words that should actually have been recognized—i.e. the words to be recognized correctly—very often sound very similar. For such similarly sounding words in particular, for example “four” and “for”, the error rate of known speech recognition devices is often especially high.
As a result of the features according to the invention, the user does not need to mark an incorrectly recognized word that he wants to replace with a correction word that should actually have been recognized. The correction device determines the phoneme sequence of the input correction word by statistical methods, which phoneme sequence represents the sound of the correction word. By comparing the phoneme sequences, the correction device then searches for a word that sounds similar to the correction word in the recognized text.
Advantageously, the incorrectly recognized word very probably to be replaced in the recognized text information is thus automatically marked by the input of the correction word. The user can effect the replacement of the marked word by inputting a confirmation, or cause marking of a further similar sounding word of the recognized text information by inputting a next information.
Known correction devices of speech recognition devices enable a synchronous reproduction of the spoken words and the associated recognized words of the recognized text for the correction of incorrectly recognized words. When the user of these known correction devices notices an incorrectly recognized word, he interrupts the synchronous reproduction and executes the replacement of the incorrectly recognized word with a word put in by the user. The user then activates the synchronous reproduction again in order to find and correct further incorrectly recognized words in the recognized text.
According to the measures of claim
2
Dorvil Richemond
Ham Qi
Koninklijke Philips Electronics , N.V.
Vodopia John
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