Abstract: A speech synthesizer circuit for use in an automobile. The circuit includes a dedicated microprocessor and a speech synthesizer integrated circuit which has an output couplable to the speakers of the automobile's radio. The microprocessor monitors various automobile status condition and, based upon these conditions, causes various preprogrammed voice messages to be transmitted to the motorist. The circuit includes various novel features. These features includes novel circuit energization, conditions sensing, failure detection, and voice activation mechanisms.

Abstract: A speech synthesizer circuit for use in an automobile. The circuit includes a dedicated microprocessor and a speech synthesizer integrated circuit which has an output couplable to the speakers of the automobile's radio. The microprocessor monitors various automobile status conditions and, based upon these conditions, causes various preprogrammed voice messages to be transmitted to the motorist. The circuit includes various novel speech synthesizer features. These features includes novel circuit energization, condition sensing, failure detection, and voice activation mechanisms.

Abstract: A speech synthesizer control circuit for use in a vehicle. The circuit includes a number of features which provide cost effectiveness while maintaining speech synthesizer reliability. One feature of the invention is use of a counter circuit interposed between a control circuit and a memory where messages are stored. The counter is controllably clocked by the controller to create an address within the memory for a particular message. Other features of the invention include control of speech volume, chime generation, and voltage protocals in the speech synthesizer control circuit.