Cellular hand held portable speakerphone system having an interface adapter

An apparatus, comprising:

• a cellular telephone including a telephone microphone, a telephone speaker, receiver means for receiving analog signals and digital signals from a base station, transmitter means for transmitting analog signals and digital signals to the base station, a battery pack configured to be mounted within the cellular telephone, the battery pack including a power source, switch means for electrically coupling the power source and the cellular telephone, the switch means configured to be turned off and on, battery state monitoring means for continuously monitoring a state of charge of the power source, determining means, responsive tot he state of charge of the power source, for determining an amount of time remaining for use of the battery pack based on the state of charge, and display means, responsive to the control means, for providing a real time display of the time remaining for use of the battery pack;
• interface means for supporting the cellular telephone in at least a locked position and an unlocked position, the interface means including power supply means for supplying power to the cellular telephone when the cellular telephone is being supported by the interface means, an interface microphone, an interface speaker, each of the interface microphone and the interface speaker being operably connected tot he cellular telephone when the cellular telephone is supported by the interface means, the receiver means and the interface speaker defining a receive path, and the transmitter means and one of the telephone microphone and the interface microphone defining a transmit path;
• power control means for controlling the switch means to be turned on when the cellular telephone is in the unlocked position and turned off when the cellular telephone is in the locked position;
• converter means for converging analog signals received from each of the telephone microphone, the interface microphone and the receiver means into digital signals;
• sampling means for sampling digital signals on each of the transmit path and the receive path and for storing values corresponding to a predetermined characteristic of the samples digital signals;
• determining means for determining an energy value for the digital signals on each of the transmit path and the receive path over a predetermined period based on the stored values of the predetermined characteristic;
• switching means for switching off one of the transmit path and the receive path in response to the determined energy values;
• memory means for storing digital signals;
• memory record means for storing digital signals from the receiving means and from the converter means in the memory means;
• and
• memory playback means for transferring digital signals stored int he memory means to the transmitter means and for converging digital signals from the memory means into analog signals ad transferring the analog signals to one of the telephone speaker, the interface speaker and the transmitter means.