WO2002046708A1

WO2002046708A1 - Acoustic measuring system

Info

Publication number: WO2002046708A1
Application number: PCT/AT2001/000372
Authority: WO
Inventors: Michael Vatter
Original assignee: Vatter Acoustic Technologies Vatter Und Höfer Oeg
Priority date: 2000-12-04
Filing date: 2001-11-26
Publication date: 2002-06-13
Also published as: DE10195362D2; AU2002223254A1

Abstract

A method for centrally detecting or modeling the acoustics in an enclosed space or in a partially defined outdoor area, wherein the acoustic properties especially the sound response are measured locally and an acoustic signal is emitted by at least one sound source in said space or area, said acoustic signal being recorded by one or several measuring microphones. According to the inventive method, local measurement is carried out by a local computer such as a commercially available personal computer, software for the computer-assisted local measurement is transmitted from a central computer to said local computer, preferably via a data transmission line and the data arising from the measurement is transmitted to the central computer or one or several other computers for reprocessing purposes, optionally along with other data required for processing.

Description

ROOM ACOUSTIC MEASUREMENT SYSTEM

The invention relates to a method for the central recording or modeling of audibility in a closed room or a partially limited area outside, in the course of which a local measurement of the acoustic room properties, preferably the room response, is carried out, in which a sound signal is generated by at least one sound source is caused in the room or spatial area, which is recorded by one or more measuring microphones.

In connection with the detection of the audibility of a room, in particular for measuring and testing sound reinforcement systems, methods are known in which a sound signal is produced by a sound source for measuring the room response and is recorded by a measuring microphone. Such methods are used in particular in the pulsed noise test that has long been used in room acoustics. With these methods, however, a separate measuring device with a DSP card, loudspeaker and microphone is required for the measurement. When measuring the acoustic properties of the room, this measuring device must be positioned on site and operated by a trained employee. This required considerable effort, in particular arrival times are necessary, which results in considerable personnel expenditure and the measurement is slowed down and made more expensive.

It is an object of the present invention to provide a method for the central recording or modeling of audibility in a closed room or a partially limited area outside, which eliminates the disadvantages described and the basic prerequisite for a decentralized measuring method using a measuring platform that is not is based on a stand-alone principle. According to the invention this is achieved in that the local measurement with a local computer, e.g. a commercially available personal computer, software for computer-aided local measurement is transmitted from a central computer to the local computer, preferably via remote data transmission, and the data resulting from the measurement, possibly with further data necessary for processing, is sent to the central system for further processing Computers or to one or more other computers can be transmitted.

In this way, the local measurement of the acoustic room properties can be carried out on site without a separate measuring device. In order to obtain a particularly simple and fast transmission, further

Execution of the invention can be provided that the software and / or the data

Internet is transmitted.

In order to transmit large amounts of data, or further data such as instructions for use, etc., it can be provided according to a further embodiment of the invention that the

Software and / or the data is transmitted via data carriers, in particular via compact disk.

The invention further relates to a method for measuring the acoustic

Room properties, preferably the room response, in a closed room or a partially limited area outside, whereby at least one sound source causes a sound signal in the room or area, which is recorded by one or more measurement microphones, comprising at least one calibration step for the amplification factors for the sound source output and for the microphone input.

In connection with the measurement of the acoustic room properties in a closed room or a partially limited area outside, methods are known which include at least one calibration step for the amplification factors for the

Sound source output and for the microphone input include. In particular, here are the

TEF analyzer and the MLS SA card called.

With these methods, however, the calibration of at least one audio component must be carried out by a trained employee.

It is therefore a further object of the present invention to present a method for measuring the acoustic properties of the room, which eliminates the disadvantages described and enables the measurement to be carried out in a simple manner and also by untrained employees.

According to the invention this is achieved in that the calibration of the amplification factors for the sound source output and for the microphone input takes place automatically.

In this way, the measurement can be carried out without a separate calibration step from

User is requested.

In order to determine the amplification factors for the sound source output and for the microphone input, it can be provided in a further development of the invention that for the automatic

Calibration pulses of a test signal are transmitted to the sound sources by the

Sound sources reproduced signal is sampled again via the measuring microphone and the Gain factors for the sound sources and the measuring microphone are changed until there is a predetermined level difference between the recorded one

Test signal and the background noise level also recorded results and on the other hand no overdrive occurs during the sampling.

To ensure a sufficient signal-to-noise ratio, according to another

Variant of the invention can be provided that the level difference between the recorded test signal and the also recorded background noise level is at least 30db.

In order to optimize the duration of the measurement, it can be provided as a further variant of the invention that a measurement signal is transmitted to the sound sources for the local measurement, the signal from the measurement microphone is recorded at the same time, and the recording is continued as far beyond the end of the measurement signal, until a predetermined one

Level difference between the measured signal and that during the transmission of the

Measurement signal measured level results.

In order to obtain the broadest possible frequency response in the evaluation, in

Further development of the invention can be provided that the measurement signal consists preferably of white or pink noise.

In order to further reduce the measurement time, it can be provided according to a further variant of the invention that the measurement signal consists of a pseudo-random noise signal, which after the

MLS process is generated.

In order to measure the room response to different sound signals, it can be provided according to a further embodiment of the invention that the measurement signal consists of two

Sections is composed, a first part consisting of a pseudorandom

Noise signal, which is generated by the MLS method, and another part of preferably white or pink noise.

The invention also relates to a computer system with a program for measuring the acoustic properties of the room.

Computer systems with programs for measuring the acoustic room properties are in

State of the art known.

In these computer systems, too, the calibration must be at least one

Audio components can be made by a trained employee. It is an object of the present invention to present a computer system with a program for measuring the acoustic properties of the room, which enables the measurement to be carried out even by untrained employees. According to the invention, this is achieved in that the computer system carries out the steps of the method according to claims 4-10.

Furthermore, the invention relates to a computer program product for measuring the acoustic room properties, preferably the room response, in a closed room

Space or a partially restricted outdoor area that can be loaded directly into the memory of a digital computer.

Computer program products for measuring acoustic room properties are also available

State of the art known.

With these computer program products, too, calibration must be carried out by a trained employee.

It is the object of the present invention to present a computer program product which also enables untrained people to measure the acoustic properties of the room

Allows employees when the product runs on a computer.

According to the invention, this is achieved in that the computer program product

Software code sections with which the steps according to claims 4-10 are carried out when the product is running on a computer.

Furthermore, the invention relates to a computer program product for measuring the acoustic

Room properties, preferably the room response, in a closed room or in a partially limited outdoor area that is suitable for a computer

Medium is stored.

Computer program products for measuring acoustic room properties are known.

These are generally stored on computer-compatible media and thus potentially produce the effect of the measurement.

However, these computer program products require that the calibration is done by a trained operator.

It is an object of the present invention to present a computer program product which is stored on a computer-suitable medium and which enables untrained employees to measure the acoustic properties of the room in a decentralized manner This is achieved according to the invention in that the computer program product comprises computer-readable program means which cause a computer to carry out the steps described in claims 4-10.

Furthermore, the invention relates to a method for acquiring and processing data, which requires the local measurement of one or more physical quantities. When preparing offers for technical solutions, which require the previous measurement of certain physical quantities at the customer, this measurement has so far been carried out on site by trained employees.

It is the object of the present invention to present a method for the acquisition and processing of data, which requires the local measurement of one or more physical quantities, which enables the measurement to be carried out locally even by untrained employees and which evaluates it central point relieved. According to the invention this is achieved in that the local measurement with a local computer, e.g. a commercially available personal computer, software for computer-aided local measurement is transmitted from a central computer to the local computer, preferably via a remote data line, and the data resulting from the measurement, possibly with further data necessary for processing, is sent to the central system for further processing Computers or to one or more other computers can be transmitted.

The invention is described in more detail with reference to the accompanying drawings, in which particularly preferred exemplary embodiments are shown. It shows:

Fig. 1 is a schematic diagram of an arrangement for performing the inventive

Method for measuring the acoustic properties of the room;

Fig. 2 is a schematic diagram of a further arrangement for executing the inventive

Process with intermediate amplifier and mixer;

3 shows a flow chart of an embodiment of the method according to the invention for the automatic calibration of the gain factors;

4 shows a further flow chart of an embodiment of the method according to the invention for determining the optimal amplification factors;

5 shows a typical signal curve in the automatic calibration,

6 shows a typical signal curve during the measurement and 7 shows a flow chart of an embodiment of the method according to the invention for embedding the measurement in an e-commerce solution.

The method according to the invention can be used to evaluate or improve the audibility in a closed room or in a partially limited area outside, e.g. Open-air theater, sports facilities, etc. are used. The measurement of the acoustic properties of the room in the room in question is of crucial importance for the detection of audibility. In general, the measurement of sound reflections in a room is used to assess audibility, but other measurements, such as those of the room impulse response, can also be carried out. The impulse sound test gives e.g. Information in which order and from which direction direct sound and sound reflections arrive at a certain place. From this, a large number of dimensions, such as the degree of clarity, the reverberation, the reflectance, etc. can be derived. Data such as the room geometry and the assignment of materials to the individual surfaces can of course also be used for statements in the field of geometric room acoustics, since simple geometric considerations derived from the laws of reflection are sufficient to record the behavior of the first reflections. In the area of reverberation, with an increasingly dense reflection sequence, statistical methods form the basis for calculating the reverberation time. In addition to the behavior of the first reflections, the reverberation time is of crucial importance when assessing hearing. It is a global criterion for the acoustic properties of a room in statistical room acoustics. Also for calculations of wave theoretical room acoustics such as The data obtained can be used for the investigation of small, less damped rooms. The target group for such measurements are recording studios, cinema and concert halls, event locations in general, seminar and meeting rooms, school classes and lecture halls. Optimally coordinated room acoustics are important for all of these locations, be it in terms of suitability for good speech intelligibility or music reproduction. On the basis of the measurement, the need for acoustic absorption or diffusion elements can be calculated in order to optimize the audibility in the examined rooms for the planned use.

So far, a separate measuring device with DSP card, loudspeaker and microphone or a stand-alone device was required for the measurement. When measuring the acoustic This measuring device had to be positioned on site and operated by a trained employee. This required considerable effort, in particular arrival times were necessary, which resulted in considerable personnel expenditure and made the measurement more expensive.

In contrast, the presented method for recording or modeling of hearing is characterized in that the local measurement is carried out with a local computer, for example a commercially available personal computer (PC) 1, a software for computer-aided local measurement from a central computer to the local one Computer, preferably via remote data line, is transmitted and the data resulting from the measurement, possibly with further data necessary for processing, are transmitted to the central computer or to one or more further computers for further processing. This method only requires a commercially available PC 1 with a sound card, at least one loudspeaker 2, which forms the sound source, and at least one microphone 3, as can be found in all recording studios. In this context, the term PC is not limited to the usual personal computers with computers, monitors, keyboards and mice, but also includes other forms such as laptops or personal digital assistants (PDAs), provided that the required computing power is available, pure terminals that For example, can be delivered without a hard disk, but of course also more powerful computers in the server area. Since the differentiation of the computer categories is rather blurred, the term PC is chosen to represent all of these forms. It can also be provided that it is a computer integrated in different hardware, such as a microprocessor-controlled sound laboratory. For the measurement of the acoustic room properties, preferably the room response, as shown in FIG. 1, in the method according to the invention a sound signal 6 is produced by the loudspeaker 2 in a room 4, which is recorded by one or more measuring microphones 3. The measurement itself does not require any additional knowledge and can also be carried out by untrained people on site. The speaker 2 can be formed by the computer speakers of the PC 1 itself, but external speakers 2 can also be used. The microphone 3 can also be formed by the computer microphone supplied with commercially available computers. In an advantageous embodiment of the invention, the microphone 3 does not necessarily have to be linear, since in this method only the decay time is measured. In addition, as shown in Fig. 2, it can be provided that the PC 1 via a Mixer 5 is connected to the microphone 3, an amplifier 8 and the loudspeaker 2, or this also directly addresses the loudspeaker 2. The connection to external sound systems is also possible as long as it is controlled via the computer. Basically, it must be ensured that the measuring microphone 3 is primarily in the listening position, that is, for example, the position from which a sound technician follows the playback of a specific recording via loudspeakers in room 4. In the case of larger areas to be measured, such as rows of seats in movie theaters, etc., several measurements can be carried out with different positions of the microphone 3, or several microphones 3 can also be used. In particular, it is possible to vary the position of the measuring microphone 3 in order to prevent the result from being distorted by standing waves in the room 4. However, it can also be advantageous to place the microphone 3 at a position other than the listening position. For example, low frequencies at the rough edges can be measured better. The positions of the measuring microphones 3 and the sound sources 2 in the room 4 are part of the geometric spatial data which are required for the further processing of the measurement results. The room data also includes the area-related room geometry and, if necessary, the assignment of materials to the individual areas of the room 4. The method presented thus provides the basic prerequisite for a decentralized measurement method. This is the creation of a measuring platform that is not based on a stand-alone principle, but enables the measurement of room acoustic parameters using a widely used system such as a PC with a sound card using software. This enables the customer to carry out a measurement without any problems. The only requirement is a PC 1 with a sound card, as well as corresponding loudspeakers 2 and a microphone 3, via which the data describing the acoustic room properties of the room 4 or the room area is measured. A suitable hardware consists, for example, of a PC with a sound card with 16 bit resolution, line-out, line-in or microphone input, a suitable microphone for measurement, amplifier, loudspeaker and, if necessary, a mixer. The software can be designed for a special operating system such as Microsoft Windows® or Mac OS® or for operating system-independent compiler languages such as Java® or scripting languages such as Perl or other command interpreter languages. In addition, the program can be transmitted as source code or as object code, in a high-level language or in machine language. To measure the data necessary for the analysis, the software is necessary, which is played on the PC 1 via a data line. This can be done via email or a Transfer protocol such as NFS, FTP, HTTP or the like. The protocol used for transmission but also the coding of the program data are not decisive. The essential step is to transfer the software required for the measurement to the locally available PC 1. This can also be done in a conventional way, for example via CD or another data carrier. In particular, a further advantageous embodiment of the invention is characterized in that the software and / or the data is transmitted via data carriers. Transmission via radio is also conceivable. It is only essential for all forms of transmission that the software for carrying out the measurement arrives on the PC located in the measuring range and is started there. In the case of the CD, it is possible to design it as a so-called multimedia CD and, at the same time, to provide the measurement software with additional data such as instructions for use, technical documentation and information or advertising documents on the diffusion or absorption elements that can be used to optimize the audibility. In another advantageous embodiment, the software is available for download on the company website. The download homepage is then the actual interface to the customer. After the customer has found out about a product and has become curious, he loads the software package onto his computer. In this sense, a further preferred embodiment of the invention is characterized in that the software and / or the data is transmitted via the Internet. The transmission over the Internet is particularly advantageous because it is possible to make the user guidance particularly convenient. In addition, it is possible to make the software available free of charge, since there are no shipping costs. In general, the simplest and fastest transmission can be achieved in this way. After the measurement program has been transferred to the local PC 1, the customer starts the measurement program and connects his loudspeaker system 2 and a microphone 3. It is also advisable to enter master data at this time. These contain personal data, as well as the dimensions and available areas of the room. The master data can also be specified at a later date. The method for measuring the acoustic properties of the room is characterized in that the amplification factors for the sound source output and for the microphone input are calibrated automatically. The software thus automatically calibrates the loudspeakers 2 and the microphone 3. The loudspeakers 2 can be calibrated individually or together. For the calibration process, pulses of a test signal are continuously sent via the output to the amplifier 8 and further to the loudspeakers 2 transfer. In a preferred embodiment of the invention, these test signal pulses are transmitted to the sound sources, the signal reproduced by the sound sources is sampled again via the measuring microphone 3 and the amplification factors for the sound sources or the speakers 2 and the measuring microphone 3 are changed until, on the one hand, one Predeterminable level difference between the recorded test signal and the also recorded background noise level results and, on the other hand, no overloading occurs during the sampling.

The test signal, e.g. can consist of white noise, as shown in FIG. 5, generally has a certain amplitude "iSignal" and a certain duration "tSignal". The noise is sent to the loudspeakers 2 and picked up again via a microphone 3. Other possible forms of the test signal are e.g. a sweep sine or a multisine. The room response can also be determined, in particular, using the multisinus. After the test signal, no signal is transmitted for a period "tPause". The signal reproduced by the loudspeakers 2 is fed back via the measuring microphone 3 and the mixer 5 to the line input of the sound card and sampled (cf. FIG. 2). Another Preferred embodiment of the invention is characterized in that the level difference between the recorded test signal and the also recorded background noise level is at least 30 dB, and the gain of the line input and the line output is accordingly changed until, on the one hand, a level difference of more than 30 dB between the recorded test signal and the reason also recorded results in noise levels in the pauses and on the other hand there is no overloading during the sampling is it is possible to provide other strategies for calibrating the microphone 3 and the speakers 2.

In the sequence shown in FIG. 3, the amplification factors for the loudspeakers 2 and the microphone 3 are first set to their maximum value (105). The test signal is then passed to the loudspeakers 2 and the room response is recorded by the microphone 3 (100). The recorded signal is examined to see if it has no clipping (101). If this is not the case (150), the level for the microphone 3 is reduced (after 107, 151) (104) and the process is repeated until the signal no longer has clipping or the minimum level of the microphone 3 is reached (107, 151). In the latter case, the level for the microphone 3 is first set to the maximum value is set (108), the level of the loudspeaker 2 is reduced (103) and the measuring process is repeated until the signal no longer has an overload or the minimum level of the loudspeaker 2 has been reached (106, 152). If a signal is available without clipping, the level difference between the signal and the background noise is examined (102, 153). If the level difference is too small, the measurement is repeated until the difference is sufficient (153, 107, 100); if a satisfactory signal cannot be reached, the calibration is aborted (110). The calibration is now finished (after 153). Another method for automatic calibration is sketched in Fig. 4, for example. Here the amplification factors for the loudspeaker 2 and the microphone 3 are first set to their maximum value (105), then all the amplification factors are run through in a nested loop (100-154,104,100) or (100-154,106-108,100) and the values for the Level difference and signal quality are stored in a table (111). After the loop has ended, the best possible combination for the gain factors is determined from this table. A possible structure for storing the amplification factors along with the associated signal quality and the signal-to-noise ratio is implemented in this case by a simple table. In addition, it can be provided that the customer himself can make further corrections to the calibration, but this should not be done from the basic idea of automatic Remove calibration. It is essential in any case that the calibration is carried out automatically by the software and that on the one hand a certain level difference between the test signal and the basic noise level is not undercut and on the other hand no overdriving occurs when the measurement signal is sampled. If the level is set correctly, this can be signaled, for example, by a signal. The actual measuring process is then started and the reverberation time is measured automatically. During the actual measuring process, noise is sent to the loudspeakers 2 and picked up again via the microphone 3. As shown in FIG. 6, a special measurement signal is transmitted to the loudspeakers 2 and the signal from the measurement microphone 3 is recorded. In a preferred embodiment of the method presented, a measurement signal is transmitted to the sound sources during the local measurement and the signal from the measurement microphone is recorded at the same time. The recording is continued beyond the end of the measurement signal until there is a predetermined level difference between the measured signal and the level measured during the transmission of the measurement signal. This level difference is again 30db in FIG. 6, but can can be chosen differently. In the embodiment of the invention outlined in FIG. 6, the measurement signal is composed of two sections, a first part consisting of a pseudo-random noise signal, which is generated according to the Maximum Length Sequence (MLS) method, and a further part preferably white or pink noise. However, other measurement signals can also be used. Furthermore, methods are possible in which one can choose between noise and MLS signal. The signal for the noise or for the MLS signal itself can be generated by the computer with the program or can also be transmitted as a data file, for example in WAV format.

The advantage of the MLS method is that the measuring time can be reduced further. In the pulse sound test and similar methods, it is known that useful and interference signals are eliminated in that the space to be measured is always excited with the same pulse, whereupon the same useful signal can always be separated from the different interference signal. The resulting longer measuring time can be avoided with the MLS method. Binary MLS signals are periodic two-level pseudorandom sequences of length L = 2 ^N -1, where N is an integer. All other measured variables can be derived from the cross-correlation of the system response to the signal and the original sequence. Of course, measurements other than that of the pure reverberation time can also be carried out, such as measurements of the frequency and phase dependence of the sound pressure level in the diffuse sound field. When measuring the room impulse response, a short burst of sound, for example, a bang stimulates sound reflections and reverberation. In this case, due to the short duration of the pulse, the reflections can be measured without being superimposed by later direct sound. The pulse duration can also be chosen to be so short that the pulse spectrum encompasses the entire audible frequency range. From the reflectogram, essential statements about the audibility at the examined location in the room can be derived. The measurement results obtained in this way can be used in a variety of ways. By folding a digitally recorded room impulse response with the signal of a real sound event, for example, an associated room sound signal, ie a room simulation, can be calculated. It is essential in all of these methods that the evaluation of the measurement takes place at a central point.

Whenever the user or customer has carried out a valid measurement, a message appears and the result can be moved to a folder on PC 1. In this way, several measurements of the same room 4 can be combined in one project become. For further processing, the measured data, possibly together with the geometric room data such as the position of the sound sources and the measuring microphones in the room, the area-related room geometry, the assignment of materials to the individual areas, are sent back to the central server. Again, this can be done in different ways. For example, it can be done directly from the program using a send button. In general, however, the data is first recorded locally and transmitted to the server in a further step. As with the transmission of the software to the PC 1, different protocols can be used. For example, it is advantageous to send the measurement result files as a whole project back to the central server via e-mail using a "Send" button. The data can of course also be transferred using a CD or diskette. This data only contains recordings from the In this context, data is to be understood to mean any information describing the measurement, that is to say both non-digital recordings and further processed measurement results, for example compressed or converted into other formats, such as ZIP or WAV files. The conversion of the measurement data described does not count as Further processing in the sense of the invention For further processing, in particular for real or audible modeling or optimization by means of computer programs, these data are transmitted to at least one further point, preferably via a remote data line, but the elaboration can also take place at several different locations. Because of the da The reverberation time and the resulting possibilities to achieve improvements in audibility by using acoustically effective elements are calculated using the room geometry and the recorded signal. The frequency-dependent evaluation is particularly advantageous, since by measuring the reverberation time depending on the frequency, statements about the room response can be obtained. In a possible embodiment of the method according to the invention, the result files are loaded into an automatic calculation program as soon as they have arrived on the central server. It is possible for a consultant to create a new project and to edit the room and customer data. The calculation shows the need for absorption and / or diffusion areas. The need for the positioning of additional absorption elements or diffusion elements can be calculated on the basis of the measured reverberation time and the room geometry and the position of the microphones 3. The fact that the evaluation of the measurement data itself is carried out at a central point enables the customer to be bound to very specific products. In this way, there is the possibility of individual advice on the Internet and, moreover, an almost unlimited range of action with minimal personnel expenditure. In this context, the embedding of the presented invention in an e-commerce solution (B), as outlined in FIG. 7, should be particularly emphasized. After the hearing has been recorded (A) and the calculation of possible improvements in hearing by using acoustically effective elements (205), an offer (206) for the acoustic equipment can be automatically created in several variants, which is controlled by the processor (207). and can be corrected if necessary. This is sent back to the customer by e-mail or he receives a notification with an access code (208) so that he can call up his personal offer. The customer can place the order directly from the offer form (209). He confirms the individual items and enters the credit card details, then sends the order back to the central office by email (210) or enters it on the protected homepage. The credit card is checked (211) and if it is found to be in order, the customer receives the formal order confirmation (212) with delivery conditions etc. When the order has been received from production (213), it is debited via credit card number (214). The customer receives a confirmation (216) and the estimated time of delivery. The parts are then dispatched (215, 217).

The method described for the local measurement of physical quantities can be applied to a large number of other areas. For every examination that requires a physical measurement and can be carried out using software on a common PC. This can be done, for example, in the field of optical measurements with commercially available digital cameras. Optical signals can be sent out on the screen and measured via the camera. These measurements can then be evaluated at a central point, for example, and optical components such as filters etc. can be proposed on the basis of them for improvement. On the other hand, physical measurements such as the speed of modem connections or more general analyzes of network traffic are also possible, which are performed locally using transmitted software and on the basis of which an offer can be made to improve the network infrastructure. It is only essential in the described method that the local measurement is carried out with a local computer, for example a commercially available personal computer, a software for the computer-aided local measurement is transmitted from a central computer to the local computer, preferably via a remote data line, and the data resulting from the measurement, optionally with further data necessary for processing, are transmitted to the central computer or to one or more further computers for further processing ,

Claims

PATENT CLAIMS

1. A method for the central recording or modeling of audibility in a closed room or a partially limited area outside in the course of which a local measurement of the acoustic properties of the room, preferably the room response, is carried out, in which a sound signal from at least one sound source in the room or spatial area is caused, which is recorded by one or more measuring microphones, characterized in that the local measurement with a local computer, for example a commercially available personal computer, software for computer-aided local measurement is transmitted from a central computer to the local computer, preferably via a remote data line, and the data resulting from the measurement, possibly with further data required for processing, is sent to the central processing unit Computers or to one or more other computers can be transmitted.

2. The method according to claim 1, characterized in that the software and / or the data is transmitted via the Internet.

3. The method according to claim 1, characterized in that the software and / or the data is transmitted via data carriers, in particular via compact disk.

4. A method for measuring the acoustic room properties, preferably the room response, in a closed room or a partially limited area outside, whereby at least one sound source causes a sound signal in the room or area, which is recorded by one or more measuring microphones, comprising at least one calibration step for the amplification factors for the sound source output and for the microphone input, characterized in that the calibration of the amplification factors for the sound source output and for the microphone input takes place automatically.

5. The method according to claim 2, characterized in that for the automatic calibration pulses of a test signal are transmitted to the sound sources, the signal reproduced by the sound sources is sampled again via the measuring microphone and the amplification factors for the sound sources and the measuring microphone are changed until on the one hand there is a predeterminable level difference between the recorded test signal and the likewise recorded background noise level and on the other hand no overdriving occurs during the scanning.

6. The method according to claim 5, characterized in that the level difference between the recorded test signal and the also recorded background noise level is at least 30db.

7. The method according to any one of claims 4-6, characterized in that a measurement signal is transmitted to the sound sources for the local measurement, the signal of the measurement microphone is recorded at the same time and the recording is continued beyond the end of the measurement signal until there is a predetermined level difference between the measured signal and the level measured during the transmission of the measurement signal results.

8. The method according to claim 7, characterized in that the measurement signal consists of preferably white or pink noise.

9. The method according to claim 7, characterized in that the measurement signal consists of a pseudo-random noise signal which is generated by the MLS method.

10. The method according to claim 7, characterized in that the measurement signal is composed of two sections, a first part consisting of a pseudo-random noise signal, which is generated by the MLS method, and a further part of preferably white or pink noise.

11. Computer system with a program for measuring the acoustic properties of the room, preferably the room response, in a closed room or a partially delimited outdoor area, characterized in that it carries out the steps according to claims 4-10.

12. Computer program product for measuring the acoustic properties of the room, preferably the room response, in a closed room or a partially limited area outside, which can be loaded directly into the memory of a digital computer, characterized in that it comprises software code sections with which the steps according to of claims 4-10 when the product is running on a computer.

13. Computer program product for measuring the acoustic properties of the room, preferably the room response, in a closed room or a partially limited area outside, which is stored on a computer-suitable medium, characterized in that it comprises computer-readable program means which cause a computer to enter the Perform steps 4-10 described steps.

14. A method for the acquisition and processing of data where the local measurement of one or more physical quantities is required, characterized in that the local measurement with a local computer, e.g. a commercially available personal computer, software for computer-aided local measurement is transmitted from a central computer to the local computer, preferably via a remote data line, and the data resulting from the measurement, possibly with further data required for processing, is sent to the central processing unit Computers or to one or more other computers can be transmitted.