GB1303021A - - Google Patents
Info
- Publication number
- GB1303021A GB1303021A GB1303021DA GB1303021A GB 1303021 A GB1303021 A GB 1303021A GB 1303021D A GB1303021D A GB 1303021DA GB 1303021 A GB1303021 A GB 1303021A
- Authority
- GB
- United Kingdom
- Prior art keywords
- signal
- signals
- derived
- channel
- low frequency
- 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
- H04S—STEREOPHONIC SYSTEMS
- H04S5/00—Pseudo-stereo systems, e.g. in which additional channel signals are derived from monophonic signals by means of phase shifting, time delay or reverberation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S5/00—Pseudo-stereo systems, e.g. in which additional channel signals are derived from monophonic signals by means of phase shifting, time delay or reverberation
- H04S5/02—Pseudo-stereo systems, e.g. in which additional channel signals are derived from monophonic signals by means of phase shifting, time delay or reverberation of the pseudo four-channel type, e.g. in which rear channel signals are derived from two-channel stereo signals
Abstract
1303021 Stereophonic systems SANSUI ELECTRIC CO Ltd 19 May 1971 [21 May 1970 (2) 24 June 1970 (7) 25 Sept 1970] 15855/71 Heading H4R In a sound reproduction system a " presence " signal is derived from the normal output signal, phase modulated by a very low frequency signal, and reproduced by a loudspeaker or loudspeakers located at the rear of the listening area. The presence signal may be derived straight from the signal in a monophonic system, from the difference between the R and L channel signals in a stereo signal, from the rear signals in a discrete four channel system, or two presence signals may be derived, as shown in Fig. 1, from R and L channel stereo signals by taking the differences R - #L and L - #R where # is between 0 and 1, and where the signals fed to the two front speakers are R+ #L and L + #R. The low frequency signal to phase modulate the presence signal, or signals, can be derived by envelope detecting the programme signal.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1585571 | 1971-05-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1303021A true GB1303021A (en) | 1973-01-17 |
Family
ID=10066737
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1303021D Expired GB1303021A (en) | 1971-05-19 | 1971-05-19 |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1303021A (en) |
-
1971
- 1971-05-19 GB GB1303021D patent/GB1303021A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |