GB1487207A - Paging receivers - Google Patents
Paging receiversInfo
- Publication number
- GB1487207A GB1487207A GB3930574A GB3930574A GB1487207A GB 1487207 A GB1487207 A GB 1487207A GB 3930574 A GB3930574 A GB 3930574A GB 3930574 A GB3930574 A GB 3930574A GB 1487207 A GB1487207 A GB 1487207A
- Authority
- GB
- United Kingdom
- Prior art keywords
- divider
- phase
- output
- oscillator
- division
- 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
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
- H04L27/22—Demodulator circuits; Receiver circuits
- H04L27/227—Demodulator circuits; Receiver circuits using coherent demodulation
- H04L27/2275—Demodulator circuits; Receiver circuits using coherent demodulation wherein the carrier recovery circuit uses the received modulated signals
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
1487207 Timing control systems PYE (ELECTRONIC PRODUCTS) Ltd 9 Sept 1974 39305/74 Heading H3A [Also in Division G4] A timing control system suitable for nominally setting the frequency of a locally generated signal at 36 to that of a received signal during the pilot tone period preceding the message in a DPSK paging receiver (see also Division G4) comprises an oscillator 32, a frequency divider 34, a phase comparator 27 including an in-lock detector 26 and a reset logic 31 (Figs. 6, 7, not shown) responsive to the divider output and the received signal for varying the divisor of 34 in dependence of the detected phase difference. The divider 34 may consist of a number of series connected bi-stable-stages (Fig. 7, not shown), at least some of which are set or reset by the phase comparator output to advance or retard the phase of the divider output by an integral number of the pulse period of oscillator 32. The control of the divider is inhibited when a measuring circuit 41 detects that the phase difference is within limits for a pre-set time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3930574A GB1487207A (en) | 1974-09-09 | 1974-09-09 | Paging receivers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3930574A GB1487207A (en) | 1974-09-09 | 1974-09-09 | Paging receivers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1487207A true GB1487207A (en) | 1977-09-28 |
Family
ID=10408846
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3930574A Expired GB1487207A (en) | 1974-09-09 | 1974-09-09 | Paging receivers |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1487207A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2240241A (en) * | 1990-01-18 | 1991-07-24 | Plessey Co Plc | Data transmission systems |
| EP0506318A1 (en) * | 1991-03-29 | 1992-09-30 | Renishaw Metrology Limited | Signal transmission system for trigger probe |
-
1974
- 1974-09-09 GB GB3930574A patent/GB1487207A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2240241A (en) * | 1990-01-18 | 1991-07-24 | Plessey Co Plc | Data transmission systems |
| EP0506318A1 (en) * | 1991-03-29 | 1992-09-30 | Renishaw Metrology Limited | Signal transmission system for trigger probe |
| FR2674659A1 (en) * | 1991-03-29 | 1992-10-02 | Renishan Metrology Ltd | SIGNAL TRANSMISSION DEVICE FOR TRIGGERED PROBE. |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| 732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |