Speech recognition device with reference transformation means

1. A speech recognition device ( 8 ) to which can be applied via a first receive channel ( 21 ) and a second receive channel ( 25 , 28 ) speech information (SI) colored by the respective receive channel ( 21 , 25 , 28 ), wherein the device used on the first channel is different that the device used on the second channel, the speech recognition device comprising:

reference storage means ( 36 ) for storing reference information (RI 1 ) featuring the type of pronunciation of words by a plurality of reference speakers and

receive channel adaptation means ( 30 , 38 , 44 ) for adapting the stored reference information (RI, ARI) to the first or second receive channel ( 21 , 25 , 28 ) used by a user, wherein the first reference information (RI 1 , ARI 1 ) and the second reference information (RI 2 , RI 3 , ARI 2 , ARI 3 ) is formed by feature vectors (FV), while each feature vector (FV) features the speech information (SI) in a respective frequency sub-range, and in that the feature vectors (FV) of the first reference information (RI 1 , ARI 1 ) feature the speech information (SI) in different frequency sub-ranges from the feature vectors (FV) of the second reference information (RI 1 , RI 3 , ARI 2 , ARI 3 ); and

user adaptation means ( 37 ) for adapting the stored reference information (RI 1 , RI 2 , RI 3 ) to the type of pronunciation of words by the user of the speech recognition device ( 8 ;) and

speech recognition means ( 29 ) for recognizing text information (TI) to be assigned to the supplied speech information (SI), while reference information (ARI 1 , ARI 2 , ARI 3 ) adapted by the receive channel adaptation means ( 30 , 38 , 44 ) and the user adaptation means ( 37 ) is evaluated, characterized in that the receive channel adaptation means ( 30 , 38 , 44 ) include reference transformation means (T 1 - 2 , T 1 - 3 , T 2 - 3 ) which are arranged for transforming first reference information (RI 1 , ARI 1 ) adapted to the first receive channel ( 21 )into second reference information (RI 2 , RI 3 , ARI 2 , ARI 3 ) adapted to the second receive channel ( 25 , 28 ) in accordance with a transformation matrix (T 1 - 2 , T 1 - 3 , T 2 - 3 ), while the adapted first reference information (RI 1 , ARI 1 ) to be transformed by the reference transformation means (T 1 - 2 , T 1 - 3 , T 2 - 3 ) may, but need not, already have been adapted to the user by the user adaptation means ( 37 ).

2. A speech recognition device ( 8 ) as claimed in claim 1 , characterized in that channel detection means ( 30 ) are provided which are arranged for detecting the first receive channel ( 21 ) or second receive channel ( 25 , 28 ) selected by the user for entering speech information (SI), and in that selection means ( 44 ) are provided which are arranged for selecting first reference information (ARI 1 ) or second reference information (ARI 2 , ARI 3 ) adapted to the selected first receive channel ( 21 ) or second receive channel ( 25 , 28 ) for evaluation by the speech recognition means ( 29 ).

3. A speech recognition method ( 8 ) of recognizing text information (TI) to be assigned to speech information (SI), where the speech information (SI) is colored by a first receive channel ( 21 ) or a second receive channel ( 25 , 28 ) and the speech recognition method ( 8 ) includes the following steps:

adapting ( 30 , 38 , 44 ) reference information (RI 1 , RI 2 , RI 3 ) that features the type of pronunciation of words by a plurality of reference speakers to the first or second receive channel ( 21 , 25 , 28 ) used by a user, wherein the first reference information (RI 1 , ARI 1 ) and the second reference information (RI 2 , RI 3 , ARI 2 , ARI 3 ) is formed by feature vectors (FV), while each feature vector (FV) features the speech information (SI) in a respective frequency sub-range, and in that the feature vectors (FV) of the first reference information (RI 1 , ARI 1 ) feature the speech information (SI) in different frequency sub-ranges from the feature vectors (FV) of the second reference information (RI 1 , RI 3 , ARI 2 , ARI 3 ); and

adapting ( 37 ) the reference information (RI 1 , RI 2 , RI 3 ) to the type of pronunciation of words by the user of the speech recognition method; and

recognizing the text information (TI) to be assigned to the speech information (SI), while the reference information (ARI 1 , ARI 2 , ARI 3 ) adapted to the first receive channel ( 21 ) or the second receive channel ( 25 , 28 ) and to the user is evaluated, characterized in that first reference information (RI 1 , ARI 1 ) adapted to the first receive channel ( 21 ) is transformed into second reference information (RI 2 , RI 3 , ARI 2 , ARI 3 ) adapted to the second receive channel ( 25 , 28 ), while the adapted first reference information (RI 1 , ARI 1 ) to be transformed may, but need not, already have been adapted to the user.

4. A speech recognition method ( 8 ) as claimed in claim 3 , characterized in that there is detected ( 30 ) which of the receive channels ( 21 , 25 , 28 ) was selected by the user for entering the speech information (SI) and in that the first reference information (ARI 1 ) or second reference information (ARI 2 , ARI 3 ) adapted to the selected receive channel ( 21 , 25 , 28 ) is used for the evaluation by the speech recognition means ( 29 ).

5. A reference determining method ( 1 ) of determining first reference information (RI 1 ) adapted to a first receive channel ( 2 ) for a speech recognition method ( 8 ), while the reference determining method ( 1 ) includes the following steps:

analyzing ( 14 ) speech information (SI) received from a plurality of first reference speakers over the first receive channel ( 2 ), each reference speaker using substantially similar input device and

producing the first reference information (RI 1 ) adapted to the first receive channel ( 2 ), characterized in that speech information (SI) received from a plurality of second reference speakers using substantially similar input devices over a second receive channel ( 4 , 6 ) is analyzed, wherein the first reference information (RI 1 , ARI 1 ) and the second reference information (RI 2 , RI 3 , ARI 2 , ARI 3 ) is formed by feature vectors (FV), while each feature vector (FV) features the speech information (SI) in a respective frequency sub-range, and in that the feature vectors (FV) of the first reference information (RI 1 , ARI 1 ) feature the speech information (SI) in different frequency sub-ranges from the feature vectors (FV) of the second reference information (RI 1 , RI 3 , ARI 2 , ARI 3 ); and a transformation matrix (T 1 - 2 , T 1 - 3 ) is determined for transforming the first reference information (RI 1 ) into second reference information (RI 2 , RI 3 ) adapted to the second receive channel ( 4 , 6 ), wherein said devices used by the plurality of second reference speakers are different than those used by the plurality of first reference speakers.

6. A reference determining method ( 1 ) as claimed in claim 5 , characterized in that for determining the first reference information (RI 1 ) and the transformation matrix (T 1 - 2 , T 1 - 3 , T 2 - 3 ) the first receive channel ( 2 ) and the second receive channel ( 4 , 6 ) are formed by a plurality of terminal units ( 3 , 5 , 7 ), which are typical of the first receive channel ( 2 ) and the second receive channel ( 4 , 6 ).

7. A computer program product ( 1 , 8 ) which can be directly loaded into the internal memory of a digital computer and includes software code sections suitable for execution by the computer for recognizing text information ( 121 ) to be assigned to speech information (SI), where the speech information (SI) is colored by the input devices used on a first receive channel ( 21 ) or a second receive channel ( 25 , 28 ), wherein the input device used on the first channel is different than the input device used on the second channel by the following steps:

adapting ( 30 , 38 , 44 ) reference information (RI 1 , RI 2 , RI 3 ) that features the type of pronunciation of words by a plurality of reference speakers to the first or second receive channel ( 21 , 25 , 28 ) used by a user, wherein the first reference information (RI 1 , ARI 1 ) and the second reference information (RI 2 , RI 3 , ARI 2 , ARI 3 ) is formed by feature vectors (FV), while each feature vector (FV) features the speech information (SI) in a respective frequency sub-range, and in that the feature vectors (FV) of the first reference information (RI 1 , ARI 1 ) feature the speech information (SI) in different frequency sub-ranges from the feature vectors (FV) of the second reference information (RI 1 , RI 3 , ARI 2 , ARI 3 ); and

adapting ( 37 ) the reference information (RI 1 , RI 2 , RI 3 ) to the type of pronunciation of words by the user of the speech recognition method; and

recognizing the text information (TI) to be assigned to the speech information (SI), while the reference information (ARI 1 , ARI 2 , ARI 3 ) adapted to the first receive channel ( 21 ) or the second receive channel ( 25 , 28 ) and to the user is evaluated, characterized in that first reference information (RI 1 , ARI 1 ) adapted to the first receive channel ( 21 ) is transformed into second reference information (RI 2 , RI 3 , ARI 2 , ARI 3 ) adapted to the second receive channel ( 25 , 28 ), while the adapted first reference information (RI 1 , ARI 1 ) to be transformed may, but need not already have been adapted to the user.

8. A computer program product as claimed in claim 7 , characterized in that it is stored on a medium that can be read by a computer.

9. A computer program product ( 1 , 8 ) which can be directly loaded into the internal memory of a digital computer and includes software code sections suitable for execution by the computer for:

analyzing ( 14 ) speech information (SI) received from a plurality of first reference speakers over the first receive channel ( 2 ), each reference speaker using substantially similar input device and

producing the first reference information (RI 1 ) adapted to the first receive channel ( 2 ), characterized in that speech information (SI) received from a plurality of second reference speakers using substantially similar input devices over a second receive channel ( 4 , 6 ) is analyzed, wherein the first reference information (RI 1 , ARI 1 ) and the second reference information (RI 2 , RI 3 , ARI 2 , ARI 3 ) is formed by feature vectors (FV), while each feature vector (FV) features the speech information (SI) in a respective frequency sub-range, and in that the feature vectors (FV) of the first reference information (RI 1 , ARI 1 ) feature the speech information (SI) in different frequency sub-ranges from the feature vectors (FV) of the second reference information (RI 1 , RI 3 , ARI 2 , ARI 3 ); and a transformation matrix (TI- 2 , TI- 3 ) is determined for transforming the first reference information (RI 1 ) into second reference information (RI 2 , RI 3 ) adapted to the second receive channel ( 4 , 6 ), wherein said devices used by the plurality of second reference speakers are different than those used by the plurality of first reference speakers.

10. A computer program product as claimed in claim 9 , characterized in that it is stored on a medium that can be read by a computer.