GB894988A - Identification of sound and like signals - Google Patents
Identification of sound and like signalsInfo
- Publication number
- GB894988A GB894988A GB560659A GB560659A GB894988A GB 894988 A GB894988 A GB 894988A GB 560659 A GB560659 A GB 560659A GB 560659 A GB560659 A GB 560659A GB 894988 A GB894988 A GB 894988A
- Authority
- GB
- United Kingdom
- Prior art keywords
- narrow band
- code
- cycles
- filter
- terminal
- 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
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K1/00—Secret communication
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
Abstract
894,988. Sound records. MUZAK CORPORATION. Feb. 18, 1959, No. 5606/59. Class 40 (2). [Also in Group XXXIX] In order to identify the origin of a recorded musical or other audio programme, a narrow band within the programme range is modulated in accordance with a characteristic code, e.g. by Morse interruptions, the presence of the code being imperceptible to a listener in normal reproduction. The narrow band may, for example, be 10 cycles in width in the vicinity of 1000 cycles. As shown, the audio signals are switched by means of a coding key 12, which may be cam-controlled, either directly from terminal 11 to terminal 13 or through a filter 14 which rejects the narrow band. In order to detect the identifying code in reproduction, the narrow band is selected by a filter 22 and fed to a transducer 23 which may comprise a recording meter, an oscilloscope or a loud-speaker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB560659A GB894988A (en) | 1959-02-18 | 1959-02-18 | Identification of sound and like signals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB560659A GB894988A (en) | 1959-02-18 | 1959-02-18 | Identification of sound and like signals |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB894988A true GB894988A (en) | 1962-04-26 |
Family
ID=9799247
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB560659A Expired GB894988A (en) | 1959-02-18 | 1959-02-18 | Identification of sound and like signals |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB894988A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4280020A (en) | 1979-01-09 | 1981-07-21 | Essex County Council | Radio telephone system with direct digital carrier modulation for data transmission |
| GB2196167A (en) * | 1986-10-01 | 1988-04-20 | Emi Plc Thorn | Encoded marking of a recording signal |
| EP0577126A1 (en) * | 1992-07-02 | 1994-01-05 | GRUNDIG E.M.V. Elektro-Mechanische Versuchsanstalt Max Grundig GmbH & Co. KG | Method and circuit arrangement for marking voice signals |
-
1959
- 1959-02-18 GB GB560659A patent/GB894988A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4280020A (en) | 1979-01-09 | 1981-07-21 | Essex County Council | Radio telephone system with direct digital carrier modulation for data transmission |
| GB2196167A (en) * | 1986-10-01 | 1988-04-20 | Emi Plc Thorn | Encoded marking of a recording signal |
| GB2196167B (en) * | 1986-10-01 | 1991-01-02 | Emi Plc Thorn | Apparatus for marking a recorded signal |
| EP0577126A1 (en) * | 1992-07-02 | 1994-01-05 | GRUNDIG E.M.V. Elektro-Mechanische Versuchsanstalt Max Grundig GmbH & Co. KG | Method and circuit arrangement for marking voice signals |
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