NL23978C - - Google Patents
Info
- Publication number
- NL23978C NL23978C NL23978DA NL23978C NL 23978 C NL23978 C NL 23978C NL 23978D A NL23978D A NL 23978DA NL 23978 C NL23978 C NL 23978C
- Authority
- NL
- Netherlands
Links
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
- H04R1/40—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers
- H04R1/403—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers loud-speakers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/30—Combinations of transducers with horns, e.g. with mechanical matching means, i.e. front-loaded horns
Landscapes
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US116251A US1684975A (en) | 1926-06-16 | 1926-06-16 | Sound-generating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL23978C true NL23978C (fr) |
Family
ID=22366087
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL23978D NL23978C (fr) | 1926-06-16 |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US1684975A (fr) |
| NL (1) | NL23978C (fr) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2458038A (en) * | 1942-08-29 | 1949-01-04 | Rca Corp | Acoustical apparatus |
| US2435535A (en) * | 1944-01-10 | 1948-02-03 | Eaves Sound Projectors Inc | Sound projecting apparatus |
| JP2945983B2 (ja) * | 1987-03-25 | 1999-09-06 | 久次 中村 | スピーカ装置 |
| US5004067A (en) * | 1988-06-30 | 1991-04-02 | Patronis Eugene T | Cinema sound system for unperforated screens |
| US5109423A (en) * | 1988-06-30 | 1992-04-28 | Jacobson Larry L | Audio system with amplifier and signal device |
| US5125732A (en) * | 1988-06-30 | 1992-06-30 | Jacobson Larry L | Motion picture exhibition facility |
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0
- NL NL23978D patent/NL23978C/xx active
-
1926
- 1926-06-16 US US116251A patent/US1684975A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US1684975A (en) | 1928-09-18 |