FR2283490A1 - Systeme de communication sonore - Google Patents
Systeme de communication sonoreInfo
- Publication number
- FR2283490A1 FR2283490A1 FR7429608A FR7429608A FR2283490A1 FR 2283490 A1 FR2283490 A1 FR 2283490A1 FR 7429608 A FR7429608 A FR 7429608A FR 7429608 A FR7429608 A FR 7429608A FR 2283490 A1 FR2283490 A1 FR 2283490A1
- Authority
- FR
- France
- Prior art keywords
- loudspeaker
- inverter switch
- oscillators
- oscillator
- warning system
- 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.)
- Granted
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
- H04R3/00—Circuits for transducers, loudspeakers or microphones
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B3/00—Audible signalling systems; Audible personal calling systems
- G08B3/10—Audible signalling systems; Audible personal calling systems using electric transmission; using electromagnetic transmission
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Emergency Alarm Devices (AREA)
- Alarm Systems (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7429608A FR2283490A1 (fr) | 1974-08-30 | 1974-08-30 | Systeme de communication sonore |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7429608A FR2283490A1 (fr) | 1974-08-30 | 1974-08-30 | Systeme de communication sonore |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2283490A1 true FR2283490A1 (fr) | 1976-03-26 |
FR2283490B3 FR2283490B3 (fr) | 1977-06-17 |
Family
ID=9142680
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7429608A Granted FR2283490A1 (fr) | 1974-08-30 | 1974-08-30 | Systeme de communication sonore |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR2283490A1 (fr) |
-
1974
- 1974-08-30 FR FR7429608A patent/FR2283490A1/fr active Granted
Also Published As
Publication number | Publication date |
---|---|
FR2283490B3 (fr) | 1977-06-17 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
GB1159787A (en) | Signalling Apparatus | |
FR2283490A1 (fr) | Systeme de communication sonore | |
GB1180444A (en) | Multiple Alarm System | |
GB806869A (en) | Pulse coding system | |
SE7713613L (sv) | Bruseliminerande system | |
GB1249598A (en) | Signal generator apparatus | |
JPS5260515A (en) | Intermediate frequency phase compounding device | |
GB1174085A (en) | Amplifier | |
JPS5593330A (en) | Receiver | |
JPS5531381A (en) | Interphone device | |
GB1334059A (en) | Electronic processing apparatus | |
GB906872A (en) | An improved alarm clock radio | |
JPS5271911A (en) | Dc-ac amplitude modulation transmitting system | |
JPS56120251A (en) | Generating system for call tone and alarm tone | |
KR890016746A (ko) | 발진기 동기용 회로장치 | |
JPS5240102A (en) | Preventing circuit for forgetting to switch off power switch of audio- amp | |
IT1031974B (it) | Disposizione circuitale per un apparecchio telefonico di abbonato con selezione a pulsanti di tono | |
JPS5735455A (en) | Remote operation device for telephone automatic response recorder with remote listening | |
FR2245031A1 (en) | Remote radio control system for cranes - inhibit circuits prevent simultaneous transmission of conflicting orders | |
ES302220A1 (es) | Perfeccionamientos en los aparatos de alarma | |
ES443363A1 (es) | Una sirena de alarma portatil. | |
JPS57178432A (en) | Audio device for car | |
GB1406971A (en) | Signal generators | |
GB937574A (en) | Improvements in or relating to remote control systems | |
GB765508A (en) | Improvements in or relating to radio receiving apparatus |