GB568912A - Sound operated electric gear - Google Patents
Sound operated electric gearInfo
- Publication number
- GB568912A GB568912A GB2032144A GB2032144A GB568912A GB 568912 A GB568912 A GB 568912A GB 2032144 A GB2032144 A GB 2032144A GB 2032144 A GB2032144 A GB 2032144A GB 568912 A GB568912 A GB 568912A
- Authority
- GB
- United Kingdom
- Prior art keywords
- relay
- circuit
- gas
- sounds
- filled
- 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
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/64—Automatic arrangements for answering calls; Automatic arrangements for recording messages for absent subscribers; Arrangements for recording conversations
- H04M1/65—Recording arrangements for recording a message from the calling party
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q1/00—Details of selecting apparatus or arrangements
- H04Q1/18—Electrical details
- H04Q1/30—Signalling arrangements; Manipulation of signalling currents
- H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
- H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
- H04Q1/446—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency
- H04Q1/4465—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency the same frequency being used for all signalling information, e.g. A.C. nr.9 system
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Selective Calling Equipment (AREA)
- Accessory Devices And Overall Control Thereof (AREA)
Abstract
568,912. Selective control by sounds. TELCS, M. L. Dec. 14, 1942, No. 20321/44. Divided out of 568,887. [Class 40 (i)] In a system for controlling apparatus by sounds, a gas-filled discharge tube is arranged between each frequency-selecting circuit and its associated relay and is biassed so as to be unaffected by inputs of small amplitude. In one arrangement, Fig. 3 (not shown), the discharge current of a gas-filled diode biases a triode amplifier tube with a relay in its plate circuit. In a modification, each selective circuit feeds the grid circuit of a gas-filled triode GT1, GT2, GT3 with one or more relay windings in its anode circuit. As shown, a relay can only operate when both its windings are operative. This is useful when (say) an automatic lift is to be controlled by speech, since vowel sounds have two or three characteristic frequencies, and in the vocal control of a typewriter. The arrangement may be associated with the selective circuits described in Specification 568,887.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1774142A GB568887A (en) | 1942-12-14 | 1942-12-14 | Sound operated electric gear |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB568912A true GB568912A (en) | 1945-04-25 |
Family
ID=10100423
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1774142A Expired GB568887A (en) | 1942-12-14 | 1942-12-14 | Sound operated electric gear |
| GB2032144A Expired GB568912A (en) | 1942-12-14 | 1942-12-14 | Sound operated electric gear |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1774142A Expired GB568887A (en) | 1942-12-14 | 1942-12-14 | Sound operated electric gear |
Country Status (1)
| Country | Link |
|---|---|
| GB (2) | GB568887A (en) |
-
1942
- 1942-12-14 GB GB1774142A patent/GB568887A/en not_active Expired
- 1942-12-14 GB GB2032144A patent/GB568912A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB568887A (en) | 1945-04-25 |
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