GB1229884A - - Google Patents
Info
- Publication number
- GB1229884A GB1229884A GB1229884DA GB1229884A GB 1229884 A GB1229884 A GB 1229884A GB 1229884D A GB1229884D A GB 1229884DA GB 1229884 A GB1229884 A GB 1229884A
- Authority
- GB
- United Kingdom
- Prior art keywords
- signal
- carrier
- sub
- frequency
- normal
- 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
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/28—Arrangements for simultaneous broadcast of plural pieces of information
- H04H20/30—Arrangements for simultaneous broadcast of plural pieces of information by a single channel
- H04H20/31—Arrangements for simultaneous broadcast of plural pieces of information by a single channel using in-band signals, e.g. subsonic or cue signal
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J1/00—Frequency-division multiplex systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/08—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division
- H04N7/081—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division the additional information signals being transmitted by means of a subcarrier
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Multimedia (AREA)
- Computer Networks & Wireless Communication (AREA)
- Television Systems (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
- Radio Relay Systems (AREA)
Abstract
1,229,884. Multiplex radio signalling; radio receiving apparatus. PHILIPS' GLOEILAMPENTABRIEKEN N.V. 22 May, 1968 [25 May, 1967], No. 24422/68. Headings H3Q and H4L. In a system for transmitting additional information on the sound channel of a conventional television broadcasting system, the sound channel having an available bandwidth of approximately the line recurrence frequency, the additional information is modulated on the lower sideband of a single sideband sub-carrier having a frequency on the verge of the normal available audio range of said sound channel. The system may be used for the transmission of special pulse coded messages, for the measurement of the relative size of the audience for a television programme, or for the transmission of the speech accompanying the television programme in a foreign language in addition to the language of the country of origin. Stereo transmission also is referred to. The line frequency or a signal derived therefrom by frequency changing is used for the sub-carrier, thus facilitating the regeneration of the sub-carrier at the television receiver for synchronous detection of the additional signal. As shown in Fig. 1, the sound channel has a normal bandwith Bg shown by the broken line 1 which is divided into a part having a bandwidth B N with a cut-off frequency # a for the normally transmitted sound signal 2 and a part having a bandwidth B for the additional signal 3 consisting of the lower sideband of sub-carrier # r . The composite signal frequency modulates the main sound signal carrier or alternatively amplitude modulation may be used. If the additional signal is used for the measurement of viewer response a much smaller bandwidth B v is required, Fig. 3. In addition to the normal sound channel 1 ranging from 0 to # g a second audio channel 6 is shown which may be transmitted as a single sideband or double sideband signal on a sub-carrier 2# g . The latter arrangement may be used for the difference signal in a conventional stereophonic transmission system. A second additional signal 7 may be transmitted as a sideband of a subcarrier #r 2 . Apparatus is described, Fig. 4 (not shown), in which the sub-carrier # g of the additional signal is suppressed. Switches are provided so that the sub-carrier and the normal audio signal may be supplied from a television receiver or a studio and the resulting composite signal may be recorded for retransmission or broadcast directly. A receiver is described, Fig. 6, in which the output of the frequency demodulator 38 is supplied via a switch 39 to the normal sound reproducing apparatus 40, 41 and is also supplied to a demodulator 42 for the aditional signal. The demodulator 42 includes a synchronous detector 47 receiving the regenerated sub-carrier derived from the line deflection stage 33 via a filter 45 and the output of the detector is supplied via a filter 48 and switch S 3 to a recorder 49 for measuring the television audience size. A predetermined signal starts the recorder after which data associated with the programme in spectrum 2 is recorded. At predetermined intervals the tape is sent to a central office for assessment. Reversal of the switches S 3 , S 4 enables information such as a special commentary on the vision signal to be received via the normal audio equipment 40, 41.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL6707233A NL6707233A (en) | 1967-05-25 | 1967-05-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1229884A true GB1229884A (en) | 1971-04-28 |
Family
ID=19800214
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1229884D Expired GB1229884A (en) | 1967-05-25 | 1968-05-22 |
Country Status (8)
Country | Link |
---|---|
AT (1) | AT286393B (en) |
BE (1) | BE715665A (en) |
CH (1) | CH491566A (en) |
DE (1) | DE1762291A1 (en) |
ES (1) | ES354219A1 (en) |
FR (1) | FR1566974A (en) |
GB (1) | GB1229884A (en) |
NL (1) | NL6707233A (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4025851A (en) * | 1975-11-28 | 1977-05-24 | A.C. Nielsen Company | Automatic monitor for programs broadcast |
FR2617358A1 (en) * | 1987-06-29 | 1988-12-30 | Thierry Fayard | Communication system using radio waves with on-television display |
-
1967
- 1967-05-25 NL NL6707233A patent/NL6707233A/xx unknown
-
1968
- 1968-05-18 DE DE19681762291 patent/DE1762291A1/en active Pending
- 1968-05-22 AT AT491768A patent/AT286393B/en not_active IP Right Cessation
- 1968-05-22 CH CH757768A patent/CH491566A/en not_active IP Right Cessation
- 1968-05-22 ES ES354219A patent/ES354219A1/en not_active Expired
- 1968-05-22 GB GB1229884D patent/GB1229884A/en not_active Expired
- 1968-05-24 BE BE715665D patent/BE715665A/xx unknown
- 1968-05-27 FR FR1566974D patent/FR1566974A/fr not_active Expired
Also Published As
Publication number | Publication date |
---|---|
CH491566A (en) | 1970-05-31 |
BE715665A (en) | 1968-11-25 |
FR1566974A (en) | 1969-05-09 |
NL6707233A (en) | 1968-11-26 |
ES354219A1 (en) | 1969-11-01 |
AT286393B (en) | 1970-12-10 |
DE1762291A1 (en) | 1970-04-23 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PLNP | Patent lapsed through nonpayment of renewal fees |