DE821964C - Device for testing electroacoustic transmission systems - Google Patents
Device for testing electroacoustic transmission systemsInfo
- Publication number
- DE821964C DE821964C DEP48586A DEP0048586A DE821964C DE 821964 C DE821964 C DE 821964C DE P48586 A DEP48586 A DE P48586A DE P0048586 A DEP0048586 A DE P0048586A DE 821964 C DE821964 C DE 821964C
- Authority
- DE
- Germany
- Prior art keywords
- harmonics
- switching elements
- output
- frequency
- transmission systems
- 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
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R29/00—Monitoring arrangements; Testing arrangements
- H04R29/001—Monitoring arrangements; Testing arrangements for loudspeakers
Description
Einrichtung zur Prüfung von elektroakustischen Übertragungssystemen zur Prüfung von elektroakustischen Übertragungssystemen mit Hilfe von periodisch wiederholten Impulsen wird nach dem Hauptpatent ein einen dreieckförmigen Impuls relativ kurzer Dauer erzeugender Generator benutzt. Zur Betrachtung des Amplitudenspektrums der über das übertragungssystem gegebenen Impulse dient ein Oszillograph und/oder Spektrograph. Die Verwendung dreieckförmiger Impulse ergibt ein über einen großen Frequenzbereich sehr gleichmäßiges Amplitudenspektrum, durch das eine ähnliche Aussteuerung der Übertragungssysteme wie bei Sprache oder Musik zustande kommt.Device for testing electroacoustic transmission systems for testing electroacoustic transmission systems with the help of periodically repeated pulses becomes a triangular pulse according to the main patent generator producing a relatively short duration is used. For viewing the amplitude spectrum the impulses given via the transmission system are used by an oscilloscope and / or Spectrograph. Using triangular shaped pulses gives an over a large one Frequency range very even amplitude spectrum through which a similar modulation the transmission systems such as speech or music comes about.
Es hat sich gezeigt, daß sich eine derartige Einrichtung sehr gut zur Feststellung nichtlinearer Verzerrungen eignet. Es genügt z. B. im Sendeteil durch einen Hochpaß o. dgl. die Grundfrequenz und gegebenenfalls weitere niedere Harmonische zu unterdrücken, um im Empfangsteil die im Meßobjekt durch nichtlineare Verzerrungen entstehende Grundtonamplitude und evtl. weitere Harmonische, z. B. im Amplitudenspektrum eines Frequenzanalysators, beobachten zu können. Bei einer unsymmetrischen Arbeitskennlinie, wie sie die meisten Verstärker, Kohlemikrophone usf. besitzen, entsteht durch Differenztonbildung u. a. bevorzugt die im ursprünglichen Frequenzgemisch nicht enthaltene Grundfrequenz und kann als Maß für die nichtlinearen Verzerrungen ähnlich dem Differenztonfaktor erster Ordnung gewertet werden. Ebenso ist aber auch eine Beobachtung z. B. des Differenztones zweiter Ordnung möglich. Es ist weiterhin möglich, durch Anwendung von entsprechenden Filtern auch durch die Nichtlinearitäten bedingte Oberschwingungen festzustellen. Die Filtermittel können veränderbar sein, um am Ausgang des Meßobjektes die durch Nichtlinearitäten bedingten Ditferenztö ne oder Oberschwingungen in Abhängigkeit von der jeweiligen Frequenz festzustellen.It has been shown that such a device works very well suitable for the detection of non-linear distortions. It is enough z. B. in the transmission part by means of a high-pass filter or the like, the basic frequency and possibly further lower ones To suppress harmonics in order to reduce those in the DUT by nonlinear ones in the receiving part Distortion of the root tone amplitude and possibly other harmonics, e.g. B. to be able to observe in the amplitude spectrum of a frequency analyzer. At a unbalanced working characteristic, as found in most amplifiers, carbon microphones etc., is created through the formation of difference tones, among other things. prefers the one in the original Frequency mixture not contained fundamental frequency and can be used as a measure for the non-linear Distortions are rated similar to the first order difference tone factor. as well is but also an observation z. B. the difference tone of the second order possible. It is still possible through the use of appropriate filters Determine harmonics caused by non-linearities. The filter media can be changeable to the output of the test object caused by non-linearities Difference tones or harmonics depending on the respective frequency ascertain.
Zur subjektiven Beurteilung der nichtlinearen Verzerrung empfiehlt es sich, zwei Kippfrequenzen mit unharmonisch liegender Differenzfrequenz zu benutzen, d. h. es werden unabhängig voneinander erzeugte dreieckförmige Impulse benutzt, deren Abstände sich unharmonisch verhalten, beispielsweise wie too :123.Recommended for the subjective assessment of the nonlinear distortion it is advisable to use two toggle frequencies with an inharmonious difference frequency, d. H. triangular pulses generated independently of each other are used, whose distances are inharmonious, for example like too: 123.
Claims (5)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEP48586A DE821964C (en) | 1949-07-12 | 1949-07-12 | Device for testing electroacoustic transmission systems |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEP48586A DE821964C (en) | 1949-07-12 | 1949-07-12 | Device for testing electroacoustic transmission systems |
Publications (1)
Publication Number | Publication Date |
---|---|
DE821964C true DE821964C (en) | 1951-11-22 |
Family
ID=7383179
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEP48586A Expired DE821964C (en) | 1949-07-12 | 1949-07-12 | Device for testing electroacoustic transmission systems |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE821964C (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1002397B (en) * | 1955-05-28 | 1957-02-14 | Standard Elektrik Ag | Test arrangement for telephone microphones |
DE972732C (en) * | 1953-03-12 | 1959-09-17 | Siemens Ag | Method for registering the frequency dependency of non-linear distortions of test objects |
-
1949
- 1949-07-12 DE DEP48586A patent/DE821964C/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE972732C (en) * | 1953-03-12 | 1959-09-17 | Siemens Ag | Method for registering the frequency dependency of non-linear distortions of test objects |
DE1002397B (en) * | 1955-05-28 | 1957-02-14 | Standard Elektrik Ag | Test arrangement for telephone microphones |
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