Patent ID: 7720215

Claim:
A speech output control device which controls output of a series of speech data items, comprising: speech output means for outputting speech; power supply means for supplying a power supply voltage to output the speech from the speech output means; speech data acquisition means for acquiring speech data of one output unit from the series of speech data items; voltage detection means for detecting the power supply voltage supplied from the power supply means when the speech data of one output unit acquired by the speech data acquisition means is output; volume level adjustment means for adjusting a volume level of the speech data of one output unit acquired by the speech data acquisition means, in accordance with the power supply voltage detected by the voltage detection means; and speech output control means for causing the speech output means to output the speech data whose volume level is adjusted by the volume level adjustment means; wherein the volume level adjustment means includes attenuation value setting means for setting a volume attenuation value which increases with a decrease in the power supply voltage detected by the voltage detection means, wherein the volume level adjustment means attenuates and adjusts the volume level of the speech data of one output unit acquired by the speech data acquisition means, in accordance with the volume attenuation value set by the attenuation value setting means, wherein the speech output control device further comprises detected voltage comparison means for comparing a last power supply voltage last detected by the voltage detection means when the speech data of one output unit is output and a present power supply voltage presently detected by the voltage detection means when the speech data of one output unit is output, and wherein the attenuation value setting means sets a volume attenuation value that varies between a case where the present power supply voltage is lower than the last power supply voltage and a case where the present power supply voltage is higher than the last power supply voltage.