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Apparatus for detecting audible signals and associated method

An acoustic signal and equipment technology, applied in the field of acoustic signal detection, can solve the problems of expensive signal filtering and unrealizable cost, and achieve the effect of simple processing and reduced signal processing tasks

Active Publication Date: 2014-11-26
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0033] So in conclusion, with today's state of the art, according to the requirements discussed above, efficient filtering of signals is very expensive and hardly achievable with reasonable outlay

Method used

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  • Apparatus for detecting audible signals and associated method
  • Apparatus for detecting audible signals and associated method
  • Apparatus for detecting audible signals and associated method

Examples

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Embodiment Construction

[0094] According to the first embodiment of the present invention ( image 3 As shown in ), the overall analysis processing architecture 30 consists of the following:

[0095] Delay-line module "Delay-Line" 31, which is used by the maximum delay N Dmax delay sample value r i and for the selected bit N of the delay line 31 D =N α ; N β ;...;N Dmax Delayed sampled values ​​are provided on and its negative values and their corresponding right-shifted variants when required;

[0096] A data pool 32 for forwarding previously provided data to a subsequent computing mechanism 33, said data pool being similar to a wiring network;

[0097] Calculation mechanism 33, which for each filter frequency f h and each filter bandwidth F·(N D +1) -1 The values ​​required in each calculation step and provided by the delay line 31 are placed on subsequent summing means by means of coefficient generators, so that their results are respectively used in subsequent in-phase y IhDi Or qua...

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Abstract

An apparatus for detecting audible signals from a sound source is disclosed which has a sampling apparatus for converting incoming continuous signals in a manner that discretizes with respect to time, wherein the apparatus has a delay line module which receives samples from the sampling apparatus and which is set up to simultaneously provide both a sample ri that is applied to its input and at least one delayed sample (I), and one or more arithmetic units equipped with filtering properties. The arithmetic units each have a switching unit which acts as a coefficient generator and which is set up to take a sampling clock i as a basis for controlling whether values ri and / or (I) provided by the delay line module are ignored or fractions thereof produced directly or by right-shifting are either added or subtracted to / from the previous computation result y I h D(i -1) or y Q h D(i -1), an adding / subtracting unit and a result memory that can be controlled by means of the sampling clock i. In addition, the ratio of the sampling frequency F to the filter frequency fh preferably follows the relationship: F = 4fh s (1; 2; 3; 4;...) ± 15%. Furthermore, an associated method is provided.

Description

technical field [0001] The invention relates to a device and a method for detecting acoustic signals, in particular ultrasonic pulses, when detecting the surroundings of a vehicle. The invention finds application in particular in the detection of acoustic signals emitted by the host vehicle and / or by another point in the vehicle's surroundings and optionally reflected from objects in the vehicle's surroundings. Furthermore, a motor vehicle with a driver assistance system having a device according to the invention is provided. Background technique [0002] Today, for the acoustic surroundings detection of vehicles, ultrasonic systems with pulsed measurements are generally used, in which short signal pulses of the order of 0.3 milliseconds are emitted and the transitions of reflected waves on objects in the surroundings are performed according to the pulses. The distance to the object is determined over time using the speed of sound. When the sound source, the receiver and / o...

Claims

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Application Information

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IPC IPC(8): G01S15/93G01S7/527G01S7/533G01S15/931
CPCG01S15/931G01S7/533G01S15/582G01S2007/4065G01S7/5273G01S7/4065
Inventor M·卡尔
Owner ROBERT BOSCH GMBH
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