FR959402A - - Google Patents
Info
- Publication number
- FR959402A FR959402A FR959402DA FR959402A FR 959402 A FR959402 A FR 959402A FR 959402D A FR959402D A FR 959402DA FR 959402 A FR959402 A FR 959402A
- Authority
- FR
- France
- 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
- 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
- H04R1/34—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means
- H04R1/38—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means in which sound waves act upon both sides of a diaphragm and incorporating acoustic phase-shifting means, e.g. pressure-gradient microphone
-
- 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
- H04R1/08—Mouthpieces; Microphones; Attachments therefor
- H04R1/083—Special constructions of mouthpieces
Landscapes
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Piezo-Electric Transducers For Audible Bands (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3406347A GB655574A (en) | 1947-12-23 | 1947-12-23 | Improvements relating to sound responsive devices, and more especially to unidirectional microphones |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR959402A true FR959402A (it) | 1950-03-30 |
Family
ID=10360909
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR959402D Expired FR959402A (it) | 1947-12-23 |
Country Status (2)
| Country | Link |
|---|---|
| FR (1) | FR959402A (it) |
| GB (1) | GB655574A (it) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109121052B (zh) * | 2018-08-16 | 2021-01-26 | 努比亚技术有限公司 | 双面听筒结构、双屏听筒切换方法及其终端 |
-
0
- FR FR959402D patent/FR959402A/fr not_active Expired
-
1947
- 1947-12-23 GB GB3406347A patent/GB655574A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB655574A (en) | 1951-07-25 |