Audio warning system for emergency vehicle - has three oscillators and inverter switch connected to loudspeaker
Номер патента: FR2283490A1
Опубликовано: 26-03-1976
Автор(ы): Gordon S Carrol
Принадлежит: Deutsche ITT Industries GmbH, ITT Industries Inc
Опубликовано: 26-03-1976
Автор(ы): Gordon S Carrol
Принадлежит: Deutsche ITT Industries GmbH, ITT Industries Inc
Реферат: The system employs a first oscillator, with a first output line to which a periodic signal whose amplitude is a function of time is supplied, a second oscillator with a second output line to which a different periodic signal whose amplitude is a second function of time is supplied and a third oscillator having a control input to allow a third periodic audio signal whose frequency is a third function of time dependant on the amplitude of the input control signal, to be supplied to a third output line. The first two output lines are connected to the fixed contacts of an inverter switch with the movable switch contact connected to a loudspeaker for providing an audio output when an audio signal is received via the inverter switch.
Arrangement for signal transmission to/from moving objects has signal processing units for alarm messages from object, control commands to object connected to short message GSM modem
Номер патента: DE19952657A1. Автор: Andy Barnekow. Владелец: Andy Barnekow. Дата публикации: 2001-05-03.