GB891305A - Improvements in or relating to arrangements of sound recording and reproducing machines controllable by remote control means - Google Patents
Improvements in or relating to arrangements of sound recording and reproducing machines controllable by remote control meansInfo
- Publication number
- GB891305A GB891305A GB702158A GB702158A GB891305A GB 891305 A GB891305 A GB 891305A GB 702158 A GB702158 A GB 702158A GB 702158 A GB702158 A GB 702158A GB 891305 A GB891305 A GB 891305A
- Authority
- GB
- United Kingdom
- Prior art keywords
- relay
- line
- release signal
- dictating
- dictating machine
- 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
- H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
- H04M11/10—Telephonic communication systems specially adapted for combination with other electrical systems with dictation recording and playback systems
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
891,305. Centralized dictation systems. AUTOPHONE Ltd. Feb. 24, 1959 [March 5,1958 No. 7021/58. Class 40 (4). In a centralized dictation system, different operations of a dictating machine are controlled by signals of different frequency transmitted from a substation. Keys are depressed to transmit the different frequencies but as a guard against failure to key the release signal, a short release signal is transmitted automatically when the handset is replaced. Three dictating machines are available to seven or more substations. Substation.-A transistor oscillator TS1 is tuned by an inductor L1, either with capacitors C1, C7 alone or with capacitors C1, C7 and one of a number of capacitors C2 to C5, C9. Transmission of the six frequencies is controlled by keys 1 to 6. At the end of a call, key 6 is depressed to transmit the release signal. When the handset, including microphone M and receiver R, is replaced, switch 10 connects negative battery to the oscillator through capacitor COND and the oscillator transmits another release signal to line during the charging period of capacitor COND. Capacitor COND is discharged through resistor R13 when the switch 10 is up. Central station.-In Fig. 2, DM denotes the recording coil of a free dictating machine allotted for the next cell. When the handset is lifted at a substation, relay L takes a first step and marks the corresponding contact of the c-bank in finder HS by disconnecting ground. Relay A, corresponding to the dictating machine shown, pulls up and is followed by J and D. The stepping magnet HSM steps the switch until C pulls up in series with L as the calling line is found. The line a, b is extended to the dictating machine and at contact c5 the: line is connected to the A relay of the next free machine. Relay L takes the second step and guards against further calls. If all the machines are busy, relay G pulls up and buzzer BZ gives a tone signal to the calling line. The line a, b may be extended to another dictating machine over contact FC whatever the state of relay C, but the control for FC is not described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB702158A GB891305A (en) | 1958-03-05 | 1958-03-05 | Improvements in or relating to arrangements of sound recording and reproducing machines controllable by remote control means |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB702158A GB891305A (en) | 1958-03-05 | 1958-03-05 | Improvements in or relating to arrangements of sound recording and reproducing machines controllable by remote control means |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB891305A true GB891305A (en) | 1962-03-14 |
Family
ID=9825144
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB702158A Expired GB891305A (en) | 1958-03-05 | 1958-03-05 | Improvements in or relating to arrangements of sound recording and reproducing machines controllable by remote control means |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB891305A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2193061A (en) * | 1986-07-24 | 1988-01-27 | Tunstall Telecom Ltd | Emergency call acceptor |
-
1958
- 1958-03-05 GB GB702158A patent/GB891305A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2193061A (en) * | 1986-07-24 | 1988-01-27 | Tunstall Telecom Ltd | Emergency call acceptor |
| GB2193061B (en) * | 1986-07-24 | 1990-08-01 | Tunstall Telecom Ltd | Emergency call acceptor |
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