Data processing: speech signal processing – linguistics – language – Speech signal processing – For storage or transmission
Reexamination Certificate
1999-01-15
2001-06-19
Dorvil, Richemond (Department: 2741)
Data processing: speech signal processing, linguistics, language
Speech signal processing
For storage or transmission
C704S221000, C704S235000
Reexamination Certificate
active
06249759
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention generally relates to a communication apparatus such as mobile or portable telephone equipment, and relates, more particularly, to communication apparatus and control method making use of speech recognition technique.
2. Description of the Related Art
In the field of mobile or portable telephone system of Japan, Personal Digital Cellular (PDC) system is currently mainstream, wherein Vector Sum Excited Linear Prediction (VSELP) system is employed as full-rate speech coding system and Pitch synchronous innovation Code Excited Linear Prediction (PSI-CELP) system is employed as half-rate speech coding system. According to these speech coding systems, an input speech signal is compared with a code stored in a speech code book prepared in advance so that a code closest to the input speech signal is selected, and the selected code is transmitted to the other party. At the code receiving side, the received code is reproduced as a speech signal by using the same code book prepared at this side.
There has been proposed a portable telephone of the PDC system having a calling restriction function for enabling only the owner of the portable telephone to make a call. Particularly, there are disclosed telephone apparatuses for performing the calling restriction based on speech recognition in Japanese Patent Application Laid-open Publication No. 61-245785 and in Japanese Patent Application Laid-open Publication No.2-34078, respectively.
For example, according to a telephone apparatus equipped with a calling restriction device as disclosed in the publication No.2-34078, a vocalized password is registered in advance and the calling restriction is removed when the same password has been input in the same speech feature.
However, according to the above-described techniques, no mention has been made about how to decide an input speech as the same speech. Further, if a complete coincidence of registered speech data with input speech data is use as a decision criterion, an enormous volume of data is required and it is almost impossible for even a telephone owner to generate a speech of a completely identical speech frequency.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a communication apparatus making use of speech recognition without requiring a large memory space and a control method for the communication apparatus.
Another object of the present invention is to provide a communication apparatus and a control method therefor, which can achieve various functions such as easy data input and voice change without requiring a large memory space.
According to a first aspect of the present invention, a communication apparatus having a speech input device includes a first memory storing a plurality of predetermined code vectors, a speech encoder for coding an input speech signal input by the speech input device to produce coded speech data by referring to the plurality of predetermined code vectors stored in the first memory, and a second memory storing registered speech data that has been produced from a predetermined speech signal by the speech encoder. The communication apparatus further includes a detector for detecting a matching level between the registered speech data and the coded speech data and a determiner for determining whether the coded speech data is true or false by comparing the matching level with a predetermined criterion.
Since truth or falsehood of the coded speech data is decided based on a result of a comparison between the matching level and the predetermined criterion, it is possible to obtain an appropriate level of precision of the decision depending on the predetermined criterion.
Further, the communication apparatus is normally set to a use restriction state and the use restriction state is removed when it has been determined that the coded speech data is true. Therefore, by setting the predetermined criterion to a desired level, the use restriction condition can be made strict or mild.
According to a second aspect of the present invention, a communication apparatus includes a transmitter for transmitting a transmission message by radio, a speech input device for inputting a speech signal, a keypad for inputting a character code, and a display for displaying information. The communication apparatus further includes a memory storing a plurality of predetermined code vectors each including a group code showing a kind of syllable and a feature code showing a difference between speech features, a speech encoder for coding an input speech signal input by the speech input device to produce an input speech code consisting of a group code and a feature code by referring to the plurality of predetermined code vectors stored in the memory, and a controller controlling the display and the transmitter such that a character corresponding to the group code of the input speech code is displayed as a transmission message in the display and the transmission message displayed is transmitted by the transmitter when the transmission message has been completed. As the transmission message can be created through the speech input device, the complexity of message creation can be reduced.
According to a third aspect of the present invention, a communication apparatus includes a transmitter for transmitting a transmission message by radio and a speech input device for inputting a speech signal. The communication apparatus further includes a memory storing a plurality of predetermined code vectors each including a group code showing a kind of syllable and a feature code showing a difference between speech features, a speech encoder for coding an input speech signal input by the speech input device to produce a transmission speech code consisting of a group code and a feature code by referring to the plurality of predetermined code vectors stored in the memory, and a controller controlling the speech encoder such that the transmission speech code is selected from the predetermined speech codes, wherein the transmission speech code is different from a predetermined speech code closest to the input speech signal with respect to only feature code.
Since speech communication can be carried out with changed voice, the communication apparatus can be utilized as a mischievous call protection function
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Dorvil Richemond
NEC Corporation
Young & Thompson
LandOfFree
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