Abstract: In a system having a response hold function as a standard function such as CDMA system, a telephone apparatus transmits a response hold request to a control center when an End key is operated upon arrival of an incoming telephone call from another telephone apparatus. Receiving the response hold request, the control center notifies the other telephone apparatus originating the telephone call of a response hold state. In a system with no response hold function provided as a standard function such as TACS system, the telephone apparatus transmits a response hold request to the control center when the End key is operated upon arrival of an incoming telephone call from the other telephone apparatus. Receiving the response hold request, the control center establishes a telephone conversation state between the telephone apparatuses. Then, hold state sound is transmitted by the telephone apparatus to the other telephone apparatus.

Abstract: An image analyzer for analyzing the position of a vehicle driver in a three-dimensional coordinate system. The analyzer comprises a light emitting element for emitting an infrared light the driver's face portion and an image detector arranged to receive reflected infrared light to generate an optical image of the driver's face portion. A microcomputer includes a memory for storing an electronic image corresponding to the optical image and processes the stored image to determine the position of a facial feature, such as an eye, in a three-dimensional coordinate system. Position indicating data is utilized in a driver assistance system.