JPS56103566A - Digital conference telephone system - Google Patents
Digital conference telephone systemInfo
- Publication number
- JPS56103566A JPS56103566A JP591580A JP591580A JPS56103566A JP S56103566 A JPS56103566 A JP S56103566A JP 591580 A JP591580 A JP 591580A JP 591580 A JP591580 A JP 591580A JP S56103566 A JPS56103566 A JP S56103566A
- Authority
- JP
- Japan
- Prior art keywords
- subscribers
- voice
- memory
- contents
- pcm
- 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.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/42—Systems providing special services or facilities to subscribers
- H04M3/56—Arrangements for connecting several subscribers to a common circuit, i.e. affording conference facilities
- H04M3/568—Arrangements for connecting several subscribers to a common circuit, i.e. affording conference facilities audio processing specific to telephonic conferencing, e.g. spatial distribution, mixing of participants
- H04M3/569—Arrangements for connecting several subscribers to a common circuit, i.e. affording conference facilities audio processing specific to telephonic conferencing, e.g. spatial distribution, mixing of participants using the instant speaker's algorithm
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
Abstract
PURPOSE:To increase the circuit multiplication factor in a system by which the signal of the maximum voice among the subscribers is sent to other subscribers, by giving a comparison to the level of the voice signals of the subscribers with use of a part of the PCM code. CONSTITUTION:The voice PCM signal of each time slot is stored in the address in the memory 10 that is designated by the counter 30 which produces a sequential address of a specific period, and at the same time stored temporarily in the comparator 60. Such procedure is repeated in the frequencies same as the number of subscribers, and a comparison is carried out when a coincidence is obtained among the voices of all subscribers. In this case, the several higher-rank bits excluding the code bit of the voice PCM of each sample are handled as the binary numbers, and these binary numbers are compared among the simultaneous callers. Then the minimum number is approximated to the maximum level of voice, and the time slot number of the relevant subscriber is stored in the memory 40. The contents of the memory 40 is addressed to read repetitively the contents of the memory 10, and this contents is sent to each subscriber.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP591580A JPS56103566A (en) | 1980-01-22 | 1980-01-22 | Digital conference telephone system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP591580A JPS56103566A (en) | 1980-01-22 | 1980-01-22 | Digital conference telephone system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS56103566A true JPS56103566A (en) | 1981-08-18 |
Family
ID=11624185
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP591580A Pending JPS56103566A (en) | 1980-01-22 | 1980-01-22 | Digital conference telephone system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS56103566A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59229961A (en) * | 1983-06-13 | 1984-12-24 | Hitachi Ltd | Detecting circuit for volume |
JPS6075162A (en) * | 1983-09-30 | 1985-04-27 | Nec Corp | Noise suppressor of conference telephone set |
-
1980
- 1980-01-22 JP JP591580A patent/JPS56103566A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59229961A (en) * | 1983-06-13 | 1984-12-24 | Hitachi Ltd | Detecting circuit for volume |
JPS6075162A (en) * | 1983-09-30 | 1985-04-27 | Nec Corp | Noise suppressor of conference telephone set |
JPH037308B2 (en) * | 1983-09-30 | 1991-02-01 | Nippon Denki Kk |
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