FR26494E - Matériel téléphonique - Google Patents
Matériel téléphoniqueInfo
- Publication number
- FR26494E FR26494E FR26494DA FR26494E FR 26494 E FR26494 E FR 26494E FR 26494D A FR26494D A FR 26494DA FR 26494 E FR26494 E FR 26494E
- Authority
- FR
- France
- Prior art keywords
- telephone equipment
- telephone
- equipment
- 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
- 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
- H04R1/406—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers microphones
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R21/00—Variable-resistance transducers
- H04R21/02—Microphones
- H04R21/021—Microphones with granular resistance material
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR26494T | 1921-09-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR26494E true FR26494E (fr) | 1924-01-03 |
Family
ID=8664917
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR528513A Expired FR528513A (fr) | 1921-09-26 | 1920-06-29 | Matériel téléphonique |
| FR26494D Expired FR26494E (fr) | 1921-09-26 | 1921-09-26 | Matériel téléphonique |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR528513A Expired FR528513A (fr) | 1921-09-26 | 1920-06-29 | Matériel téléphonique |
Country Status (1)
| Country | Link |
|---|---|
| FR (2) | FR528513A (fr) |
-
1920
- 1920-06-29 FR FR528513A patent/FR528513A/fr not_active Expired
-
1921
- 1921-09-26 FR FR26494D patent/FR26494E/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR528513A (fr) | 1921-11-14 |
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