ACOUSTIC SLEEP INHIBITING DEVICE

Abstract: A device (1) having a generator (2) for generating irre­ gularly-spaced sound messages featuring complex sound characteristics evolving in non-periodical manner; which generator (2) may be activated voluntarily or not by the user, in whom it creates a feeling of expectancy which contributes towards keeping the user alert.

Description: The present invention relates to an acoustic sleep inhibiting device, particularly, though not exclusively, suited for fitment to motor vehicles, for keeping the driver alert. Numerous devices are available for fitment to motor vehicles, for safeguarding the driver against drowsing at the wheel. Such devices usually comprise sensors appropriately located on the steering wheel, the nape of the neck, eyelids, etc., for continuously monitoring a given parameter (e.g. hand pressure on the steering wheel blinking of the eyelids, etc.) and indicating, e.g. by means of a sound alarm, any reduction in concentration on the part of the driver. Though widely used, a major drawback of devices of the aforementioned type is that they often operate too late, i.e. when the situation has already become critical. The aim of the present invention is to provide an acoustic sleep inhibiting device designed to maintain a certain level of concentration on the part of the driver, and so overcome the drawbacks associated with the aforementioned known types of devices. With this aim in view, according to the present invention, there is provided a sleep inhibiting device, conveniently designed for fitment to motor vehicles, for retaining the attention of the driver; characterised by the fact that it comprises: a generator for generating sound messages having complex sound characteristics evolving in non-periodical manner; and means for enabling the said generator, which means may be activated voluntarily or involuntarily and indirectly by the driver. A preferred embodiment of the present invention will be described by way of a non-limiting example with reference to the attached drawing, which shows an operating block diagram of the same. Number 1 in the attached block diagram indicates a sleep inhibiting device according to the present invention and substantially comprising a generator 2 for generating sound messages, and means 3 for enabling the said generator 2. Generator 2 conveniently consists of a processing unit 5 comprising, for example, a microprocessor interfacing with a non-volatile (e.g. ROM) memory 6 and a random signal generator 7. Memory 6 conveniently contains data relative to a number of messages. The data relative to each message is grouped together and connected to a single address selectable by processing unit 5 on the basis of signals supplied by generator 7. Message generator 2 also comprises a signal synthesizer 8 having its input connected to processing unit 5 and its output connected to a loudspeaker 10 via amplifier 9. Means 3 for enabling message generator 2 conveniently comprise a key 12, which may be operated by the driver and is located on the vehicle dashpanel 13, and a known type of sensor 14 for detecting a parameter depending on the concentration level of the driver. Key 12 and sensor 14 are connected to enabling inputs of processing unit 5. Device 1 operates as follows. Upon feling drowsy, the driver presses key 12 which enables processing unit 5. On the basis of random signals generated continually by generator 7, processing unit 5 withdraws from memory 6 data relative to various sound messages. The said data is then sent by processing unit 5 to signal synthesizer 8 which, in turn, sends it to loudspeaker 10 via amplifier 9. By virtue of generator 7, the sound messages transmitted by loudspeaker 10 evolve in non-repetitive manner and may be separated by time intervals which are also irregular. The said sound messages may conveniently consist of phrases or various types of acoustic signals having complex sound characteristics, the intensity, height and tone of which may also vary in random manner. The advantages of the device according to the present invention will be clear from the foregoing description. First and foremost, it may be operated directly and voluntarily by the driver, who is subjected to a sequence of irregularly-spaced sound messages having complex sound characteristics evolving in non-periodical manner, which, by creating a feeling of expectancy in the driver, contribute towards maintaining the driver's attention. A single alarm signal is therefore replaced by a continuous supply of sound messages, the sleep inhibiting effect of which is undoubtedly far more effective than a single, and invariably tardy, alarm signal. In the event of drowsiness on the part of the driver, and failure of the same to activate the device voluntarily, means 3 for enabling sensor 14 activate generator 2 automatically. To those skilled in the art it will be clear that changes may be made to device 1 as described herein without, however, departing from the scope of the present invention.

Claims: A sleep inhibiting device designed for fitment to motor vehicles, for retaining the attention of the driver, comprising a sound generator (2) for generating sound messages having complex sound characteristics, and enabling means (3) activatable voluntary or involuntary for enabling said sound generator (2), said sound generator (2) including memory means (6) storing data relative to said sound messages and an electroacustic transducing means (10) controlled by a processing unit (5) according to the data stored in said memory means (6), characterised in that said memory means (6) stores data relative to a number of messages, the data relative to each of said messages being grouped together to a single address of said memory means (6), a continuously operating random generator (7) being provided for generating random signals conditioning said processing unit (5) when so activated to randomly address the data of said memory means (6), whereby said messages are produced and evolve in a non-periodical and non-repetitive manner. A device as claimed in claim 1, characterised in that said sound generator (2) also include a sound synthesizer (8) connected to said transducing means (10), said sound messages including phrases. A device as claimed in claim 1 or 2, characterised in that said transducing means include a loud speaker (10), said sound messages being of randomly varying intensity, height and tone. A device as claimed in claim 3, characterised in that said processing unit includes a microprocessor (5) interfacing said memory means (6), said synthesizer (8) and said random generator (7). A device as claimed in claim 4, characterised in that said enabling means include a manually depressible key (12) located on a vehicle panel (13) and a sensor (14) for detecting a parameter depending on the concentration level of the driver, said key (12) and said sensor (14) being connected to corresponding enabling inputs of said microprocessor (5).

Inventors: DE BONO, ANTONIO, FUBINI, ENRICA, RUSPA, GIACOMO
Applicants: FIAT AUTO S.P.A.
Application year: 1987
Main classification: B60K28
IPC codes: B60K28