METHOD OF OPERATING DEVICE FOR FACILITATING COMMUNICATION BETWEEN ANALOG DEVICE AND DIGITAL DEVICE

Japanese Patent JPH04284045

A

PURPOSE: To provide a device which is used for making the communication between an analog device and a digital device easier. CONSTITUTION: A device used for making communication between analog device and digital device easier is composed of a transmission circuit 12, a reception circuit 14, and a control circuit 16. The circuit 12 outputs analog signals received through an input 18 as compressed digital signals from an output 26 and the circuit 14 sends compressed digital signals from an input 34 through an output circuit 44 after converting the signals into analog signals. A hand-free control circuit 54 respectively receives transmitting and received signal level information through transmitting and received speech detectors 60 and 62 and uses the information for the decision of the attenuating amounts of attenuators 30, 32, 50, and 52. A stable transmitting state is obtained when the attenuating amounts of the circuits 12 and 14 are respectively set at the maximum and minimum and a stable receiving state is obtained when the attenuating amounts of the circuits 12 and 14 are oppositely set. In addition, a stable idling state is obtained when the attenuating amounts of the circuit 12 and 14 are made equal to each other. In addition, four shifting states which make sure the smooth shifting among the three stable states are provided.

ARAN EFU HENDORIKUSON
HAABAATO EMU CHIEN
KAARIN DORIYU KABURAA
RAJIBU HATSUTANGADEI

JP24805891A

October 08, 1992

September 26, 1991

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ADVANCED MICRO DEVICES INC

G06J1/00; H04M1/60; H03M1/00; H04M9/08; (IPC1-7): H03M1/00; H04M1/60

Hisami Fukami (4 outside)

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