DE492256C - Method for compensating the acoustic feedback in meeting and music transmission systems - Google Patents
Method for compensating the acoustic feedback in meeting and music transmission systemsInfo
- Publication number
- DE492256C DE492256C DEA55222D DEA0055222D DE492256C DE 492256 C DE492256 C DE 492256C DE A55222 D DEA55222 D DE A55222D DE A0055222 D DEA0055222 D DE A0055222D DE 492256 C DE492256 C DE 492256C
- Authority
- DE
- Germany
- Prior art keywords
- acoustic feedback
- compensating
- meeting
- transmission systems
- music transmission
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M9/00—Arrangements for interconnection not involving centralised switching
- H04M9/08—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic
- H04M9/087—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic using different frequency bands for transmitting and receiving paths ; using phase shifting arrangements
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Circuit For Audible Band Transducer (AREA)
Description
Verfahren zur Kompensierung der akustischen Rückkopplung bei Besprechungs= und Musikübertragungsanlagen Bei Besprechungs- und Musikübertragungsanlagen ist der Steigerung der Lautstärke oft dadurch eine Grenze gesetzt, daß eine sogenannte akustische Rückkopplung auftritt, die dadurch bedingt wird, daß ein Teil der von den Schallsendern bzw. Lautsprechern der Besprechungsanlage abgegebenen Schallenergie auf das Mikrophon der Besprechungsanlage zurückwirkt, von der Anlage verstärkt durch die Schallsender wiedergegeben wird, zu einem Teil wieder auf das Mikrophon zurückwirkt und so fort. Bei einem bestimmten Grad der akustischen Rückkopplung beginnt dann die Anlage in einer ganz bestimmten Frequenz zu schwingen und ist damit nicht mehr betriebsfähig.Procedure for compensating for acoustic feedback in the event of a meeting and music transmission systems In meeting and music transmission systems is the increase in volume is often limited by the fact that a so-called acoustic feedback occurs due to the fact that part of the the sound energy emitted by the sound transmitters or loudspeakers of the conference system affects the microphone of the conference system, amplified by the system the sound transmitter is played back to a part affects the microphone and so on. At a certain level of acoustic feedback then begins the system vibrates at a very specific frequency and is therefore no longer operational.
Es ist nun bekannt, daß eine Kombination von Schallsendern, die für sich allein gerichtet oder nicht gerichtet sein können, für eine bestimmte Frequenz eine ganz bestimmte Richtcharakteristik hat, die im wesentlichen von den Abständen der Schallsender voneinander und ihrem Verhältnis zur Wellenlänge abhängt, und daß man diese Richtcharakteristik für eine bestimmte Frequenz dadurch verändern kann, daß man in die Zuleitungen zu den einzelnen Sendern Verzögerungselemente (Ketten) schaltet. In Entfernungen von der Lautsprechergruppe, die groß gegen den Abstand der einzelnen Lautsprecher sind, kann man auf diese Weise für eine oder mehrere Geraden die Schallenergie zu Null machen. In näherer Entfernung gelingt die Kompensation nur für diskrete Punkte.It is now known that a combination of sound transmitters that for can be directed alone or not directed for a given frequency has a very specific directional characteristic, which essentially depends on the distances the sound transmitter depends on each other and their relationship to the wavelength, and that one can change this directional characteristic for a certain frequency by that one in the supply lines to the individual transmitters delay elements (chains) switches. At distances from the loudspeaker group that are great against the distance of the individual speakers are, one can do this for one or more Just make the sound energy to zero. The compensation succeeds at a closer distance only for discrete points.
Der Erfindungsgedanke besteht nun darin, daß für die Frequenz, bei der für die Besprechungsanlage die Neigung zu einer akustischen Rückkopplung und damit zum Schwingen besteht, die Schallenergie am Mikrophonort durch Einführung von geeigneten Verzögerungselementen in die Lautsprecherzuleitungen zu einem Minimum gemacht wird. Es ist auf diese Weise möglich, die Lautstärke der Besprechungsanlage bedeutend zu steigern, ohne eine Störung des Betriebes durch eine akustische Rückkopplung befürchten zu müssen.The idea of the invention is that for the frequency, at that for the meeting system the tendency to acoustic feedback and so that there is vibration, the sound energy at the microphone location through introduction of suitable delay elements in the loudspeaker feed lines to a minimum is made. It is possible in this way to adjust the volume of the conference system can be increased significantly without disturbing the operation through acoustic feedback to fear.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEA55222D DE492256C (en) | 1928-09-01 | 1928-09-01 | Method for compensating the acoustic feedback in meeting and music transmission systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEA55222D DE492256C (en) | 1928-09-01 | 1928-09-01 | Method for compensating the acoustic feedback in meeting and music transmission systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE492256C true DE492256C (en) | 1930-02-19 |
Family
ID=6939889
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEA55222D Expired DE492256C (en) | 1928-09-01 | 1928-09-01 | Method for compensating the acoustic feedback in meeting and music transmission systems |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE492256C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE928351C (en) * | 1949-06-05 | 1955-05-31 | Siemens Ag | Loudspeaker arrangement with several individual loudspeakers arranged in a row to achieve a directional effect in the manner of the straight radiator group |
| DE939389C (en) * | 1949-05-29 | 1956-02-23 | Siemens Ag | Loudspeaker or microphone arrangement with several individual loudspeakers or individual microphones arranged in a row like the straight radiator group |
-
1928
- 1928-09-01 DE DEA55222D patent/DE492256C/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE939389C (en) * | 1949-05-29 | 1956-02-23 | Siemens Ag | Loudspeaker or microphone arrangement with several individual loudspeakers or individual microphones arranged in a row like the straight radiator group |
| DE928351C (en) * | 1949-06-05 | 1955-05-31 | Siemens Ag | Loudspeaker arrangement with several individual loudspeakers arranged in a row to achieve a directional effect in the manner of the straight radiator group |
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