Cellular telephone with voice dialing function

Details Cellular telephone with voice dialing function Cellular telephone with voice dialing function

1998-07-20

2001-05-01

To, Doris H. (Department: 2682)

Telecommunications

Transmitter and receiver at same station

Radiotelephone equipment detail

C455S569200, C455S575100, C379S088010, C704S275000

Reexamination Certificate

active

06226532

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to cellular telephones, and in particular, to a cellular telephone having a voice dialing function.
DESCRIPTION OF THE RELATED ART
A cellular telephone having a voice dialing function employs a voice recognition device, which extracts features such as frequency from the input voice signals in order to recognize the input voice. In general, the voice recognition device has a large number of input voice signals to process, which may cause overload on the device.
A known voice dialing method for solving the overload problem is to utilize a hands-free kit including a digital signal processor (DSP) and a nonvolatile memory (e.g., flash memory or EEPROM (Electrically Erasable and Programmable Read Only Memory)). The DSP in the hands-free kit extracts the feature data from the input voice signals and stores the extracted feature data in the nonvolatile memory (i.e., a voice recognition memory) as reference feature data. Upon receipt of a voice dialing command, the DSP compares the feature data of the input voice signals with the reference feature data registered in the voice recognition memory to recognize the input voice signals, and provides the voice recognition results to the cellular telephone. The cellular telephone then dials a telephone number according to the voice recognition results. The voice recognition memory is divided into three storage areas; a first storage area for index data; a second storage area for storing information of the voice signal input from a microphone of the cellular telephone; and a third storage area for storing information of the voice signal input from a microphone of the hands-free kit.
FIG. 1
illustrates a memory map for the voice recognition memory according to the prior art. As illustrated, the voice recognition memory is divided into three storage areas Mi, Mhs, and Mhf. The storage area Mi stores the index data and the storage area Mhs stores the reference feature data Fhs
1
and Fhs
2
and voice playback data VP
1
of the voice signals input from the cellular telephone handset. The storage area Mhf stores the reference feature data Fhf
1
and Fhf
2
and voice playback data VP
2
of the voice signal input from the hands-free kit.
The reason that the voice recognition memory is divided into the storage areas Mhs and Mhf having the same structure is that even though a certain word is pronounced by the same user, the feature data output from the hands-free kit may be different from the feature data output from the cellular telephone handset. Therefore, the reference feature data Fhs
1
and Fhs
2
for the cellular telephone handset and the reference feature data Fhf
1
and Fhf
2
for the hands-free kit are separately stored in the storage areas Mhs and Mhf, respectively. Further, the conventional voice recognition memory stores the voice playback data VP
1
and VP
2
separately in the respective storage areas Mhs and Mhf, thereby reducing efficiency of the memory.
However, since the voice playback data VP
1
and VP
2
are used in playing back the voice of the word that the user pronounced, it is not necessary to store the voice playback data VP
1
and VP
2
separately. Rather, it is preferable that a selected one of the voice playback data VP
1
and VP
2
is stored in the voice recognition memory.
In general, the storage regions for the voice playback data VP
1
and VP
2
are much larger in capacity than the storage regions for the feature data Fhs
1
, Fhs
2
, Fhf
1
and Fhf
2
. Therefore, it is uneconomical for the voice recognition memory to have the two voice playback storage regions VP
1
and VP
2
for the same use. In addition, the voice recognition memory with the high storage capacity has increased power consumption, which may cause a reduction of the serviceable duration of the telephone battery.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a cellular telephone with a voice dialing function in which a voice recognition memory is effectively and efficiently managed.
To achieve the above object, the present invention provides a cellular telephone capable of being connected to a hands-free kit, and having a voice recognition device for extracting feature data from an input voice signal so as to recognize the voice signal, and a memory for storing the feature data. The memory is divided into a first storage area for storing index data, a second storage area for storing the feature data input from the cellular telephone, a third storage area for storing which the feature data input from the hands-free kit, and a fourth storage area for storing voice playback data. The fourth storage area comprises a storage region for storing the voice playback data and another storage region for storing a telephone number.
Preferably, the index data comprises a first address where the feature data input from the cellular telephone is stored, a second address where the feature data input from the hands-free kit is stored, and a third address where the telephone number and the voice playback data are stored.


REFERENCES:
patent: 4731811 (1988-03-01), Dubus
patent: 5042063 (1991-08-01), Sakanishi et al.
patent: 5222121 (1993-06-01), Shimada
patent: 5301227 (1994-04-01), Kamei et al.
patent: 5353376 (1994-10-01), Oh et al.
patent: 5371779 (1994-12-01), Kobayashi
patent: 5481595 (1996-01-01), Ohashi et al.
patent: 5805672 (1998-09-01), Barkat et al.

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