| 摘要 |
In the device and method for generating and evaluating ultrasound signals, particularly for determining the distance of a vehicle from an obstacle, an ultrasound received signal is received by at least one ultrasound receiver subscriber of a data bus, after a burst transmission signal comprising a plurality of ultrasound pulses and having a burst length has been transmitted by at least one ultrasound transmitter subscriber of the data bus. The ultrasound received signal is subdivided into time sections which are substantially equal to half the burst length. The peak value for each time section of the ultrasound received signal is transmitted via the data bus to a central control and evaluation unit. On the basis of the peak values of the received signal for each time section, taking into account threshold value tracking, it is determined in the control and evaluation unit whether the ultrasound received signal has time sections in which the ultrasound received signal is greater than the tracked threshold value or equal to the tracked threshold value. |
| 主权项 |
1. A device for generating and evaluating ultrasound signals, particularly for determining the distance of a vehicle to an obstacle, comprising
a data bus for transmission of useful data and control data between at least one ultrasound transmitter subscriber, at least one ultrasound receiver subscriber and a central control and evaluation unit for controlling the at least one ultrasound transmitter subscriber and the at least one ultrasound receiver subscriber and for evaluation of the received signal of the ultrasound receiver subscriber, performed while tracking a threshold value, under the aspect of whether this received signal at least for a time period is larger than or equal to the tracked threshold value, particularly for obtaining the distance to an obstacle if such an obstacle exist within a distance area of a pre-settable size, the ultrasound transmitter subscriber comprising an ultrasonic transmitter for emitting a burst transmission signal which has a burst length and comprises a plurality of ultrasonic pulses, and the ultrasound receiver subscriber comprising an ultrasonic receiver for receiving, as an ultrasonic received signal, a burst transmission signal reflected at an obstacle, and comprising a signal processing unit for processing the received signal received by the ultrasonic receiver, with the received signal being divided, from the start of an emission of the ultrasound burst transmission signal, into individual time sections of a length substantially equal to half of the burst length, characterized in that the signal processing unit is operative to determine, for each time section, a peak value of the received signal, that the at least one ultrasound receiver subscriber is operative to transmit the peak values of the time sections of the received signal via the data bus to the central control and evaluation unit, and that, on the basis of the peak values received from the at least one ultrasound receiver subscriber via the data bus, the control and evaluation unit, particularly for obtaining the distance to a potential obstacle, is operative to detect whether the received signal in at least one of the time sections is larger than or equal to the tracked threshold value. |
