Process and circuitry for the supplying of loudspeakers and othe

Details Process and circuitry for the supplying of loudspeakers and othe Process and circuitry for the supplying of loudspeakers and othe

1995-03-23

1998-07-21

Harvey, Minsun Oh

Electrical audio signal processing systems and devices

Vehicle

381 77, H04B 100

Patent

active

057844720

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a process and to a circuitry arrangement for the supplying of loudspeakers in vehicle doors with electrical l.f. audio signals and of further electrical consumers in the vehicle doors with control signals and with load current. In automobile doors nowadays a large number of electrical consumers are accommodated, which have to be supplied with current and electrical control signals, for example window raisers, adjustable outside mirrors, outside mirror heating, warning light, door-closing contacts, contacts for interior illumination, loud speakers, central locking, possibly also an operating unit for an electrical sliding roof. In conventional circuitry technology there are needed for this up to 40 lines. This presents, however, a considerable problem for the mounting of the doors and renders repairs to the door difficult, since the lines are not only laid in part in the door and in part in the rest of the body, but also have to be led into the respective door by means of a flexible cable harnessing. Moreover, most of the lines must conduct a load current and, therefore, must have a sufficiently large line cross section. In view of the fact that the number of electrical lines in motor vehicles has increased very strongly in the last few years (a modern middle class car contains on the order of 1000 meters of cable), the automobile manufacturers have in the meantime serious problems in accommodating cable harnessings (Kabelbaume) in the vehicle.
From EP 0,277,014 A2 it is a known practice to supply the seating places in an airplane, on the railway or in a traveling bus with video, audio, control, and state interrogation signals in the multiplex process, but over these lines there are not simultaneously transmitted load currents over the same lines to electric consumers in the seats, and difficulties such as arise in the cabling of vehicle doors are not addressed here. A similar situation is present with U.S. Pat. No. 4,176,250, from which it is a known practice to transmit exclusively control signals in the time multiplex process into vehicle doors or out of them.
From EP-A-393,233 it is a known practice to transmit measurement signals in vehicles between sensors, such as the filling state indicator in the fuel tank, the oil pressure meter in the motor housing, temperature sensors and light sensors for the headlight control and their appertaining indicating elements, an air-conditioning installation, control lights and the like together with the supply voltage for the sensors over a common line, in which the supply voltage is modulated with the measurement signals. Load currents for consumers operated by electric motors or for heating systems are just as little co-transmitted here as are audio signals.
Underlying the present invention is the problem of reducing the cabling expenditure arising for vehicle doors.
This problem is solved by a process with the features given in claim 1 and by a circuitry arrangement with the features given in claim 10. Advantageous further developments of the invention are the object of the dependent claims.
According to the invention the control signals and l.f. audio signals to be transmitted into a door are modulated outside the door onto a common carrier signal and transferred on this carrier over a data line into the door, separated there according to audio and control signals and conducted onward to their predetermined consumers. Furthermore, the carrier signal is rectified in the door and used for the current supply of the consumers provided in the door. There the transfer of the control signals occurs purposefully in the form of a serial data bus.
Transmitting control signals in the form of a serial data bus is already known per se in automobile technology, for example in the electronic motor control, but not yet for the transmission of control signals into a door. According to the invention, however, not only control signals are transmitted as serial data bus, but their transmission combines with the transmission of l.f. audio signals which are m

REFERENCES:
patent: 4176250 (1979-11-01), Berglind
patent: 4593403 (1986-06-01), Kishi
patent: 5034996 (1991-07-01), Carey

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