Method and system for adjusting volume of conference call

A method for adjusting a volume of a conference call, adapted to adjust voice volumes by a host for providing to a plurality of sub-devices located in a same place and participating in the conference call, comprising:

• respectively connecting the plurality of sub-devices located in the same place with the host, and detecting a number of the connected sub-devices by the host;
• receiving an original voice signal from an external device establishing the conference call with the host by the host;
• adjusting a voice volume of the original voice signal according to the number of the connected sub-devices by the host to generate an adjusted voice signal adapted to each of the plurality of sub-devices, comprising:
• inquiring a volume mapping table to obtain a volume threshold corresponding to the number of the sub-devices by the host;
• determining whether the voice volume of the original voice signal exceeds the volume threshold by the host;
• and
• decreasing the voice volume of the original voice signal according to the volume threshold by the host to generate the adjusted voice signal adapted to each of the sub-devices if the voice volume of the original voice signal exceeds the volume threshold;
• and
• respectively transmitting the adjusted voice signal to the plurality of sub-devices to play by the host,
• wherein the step of decreasing the voice volume of the original voice signal according to the volume threshold by the host to generate the adjusted voice signal adapted to each of the sub-devices comprising:
• obtaining a decibel (dB) capable of being produced by a loudspeaker of each of the sub-devices by the host;
• and
• decreasing the voice volume of the original voice signal according to a proportion of the decibels of the sub-devices by the host to generate the adjusted voice signal adapted to each of the sub-devices.