Method and device for imaged representation of acoustic objects, a corresponding information program product and a recording support readable by a corresponding computer
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Abstract
The invention relates to a method and device for imaged representation of acoustic objects by taking acoustic cards with the aid of an acoustic set to which a reference image of a measure object is associated. Said invention also relates to an information program product and to a recording support which is readable by a corresponding computer and can be used, in particular for photographic and filmic documentation and for acoustic analysis of noise sources, for example of machines, devices and vehicles. For this purpose an acoustic camera is used. Said camera consists of a microphone assembly of an integrated video camera, a data recording unit connected to a microphone and to an angular sensor, a calibration device and a computer. Said video camera makes it possible to automatically document each measure in such a way that photographic records made by the camera are recorded and inseparably united in a dataframe with recording of the time function of the microphone associated with time-dependent synchronization signals, with all information on a scene and files of the microphone parameters and the data recording device. A time function, a frequency function, acoustical pressure, coordinates, tonality or the correlation with a known time function can be called for each point of an acoustic image by means of a mouse click on said point and a menu called by the mouse right button. Said acoustic camera is also provided with other functions such as automatic illumination which make it possible to select different methods (absolute, relative, manual, minus Delta, Lin/Log, all effective value, pic) for adequately pre-setting a minimum and maximum of a colour scale.
32 Citations
73 Claims
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1-53. -53. (canceled)
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54. Process for imaging acoustic objects by using a microphone array to record acoustic maps which have a reference image of the measured object associated with them, characterized in that
the microphone array and an optical camera are arranged in a specifiable position to one another and the optical camera automatically documents at least part of the measurements; -
the acoustic map and the optical image field are superimposed by having the object distance and the camera'"'"'s aperture angle define an optical image field on which the acoustic map is calculated; calculation-relevant parameters of the microphones and the camera of an array are stored in an unmistakable way in a parameter file associated with the array; amplifier parameters are stored in one or more parameter file(s) which are associated with the amplifier modules or the data recorder; the microphone array and the amplifier modules or data recorder are each given electronic signatures which unmistakably load the corresponding parameter files; the calculated acoustic image field is decomposed into subareas whose centers of gravity represent the coordinates of the pixels to be calculated; acoustic maps are optimally exposed by selecting various methods (absolute, relative, manual, minus_delta, lin/log, all, effective value, peak) to specify the suitable minimum and maximum of a color scale; synchronization errors of all microphones and amplifier channels are eliminated by compensating the pictures with corresponding parameters from the parameter files of the microphone array and the data recorder; records of the camera pictures and the associated records of the microphone time functions, time synchronization signals, scene information, and parameter files of the microphone array and the data recorder are stored together with information about this association. - View Dependent Claims (55, 56, 57, 59, 60, 61, 72, 73)
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62. Device for imaging acoustic objects by recording acoustic maps which have a reference image of the measured object associated with them using a microphone array, which has an optical camera integrated into it so that the two form a unit in which the microphone array, a data recorder, and a data processing device exchange microphone data, camera image(s), and time synchronization information through means of data transfer
characterized in that the device is set up in such a way that calculation-relevant parameters of the microphones and the camera of an array are stored in an unmistakable way in an array parameter file; - and
synchronization errors of all microphones and amplifier channels are eliminated by compensating the pictures with corresponding parameters from the parameter files of the microphone array and the data recorder. - View Dependent Claims (63, 64, 65, 66, 67, 68, 69, 70, 71)
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Specification