JPS57143950A - Monitoring circuit for auxiliary circuit - Google Patents
Monitoring circuit for auxiliary circuitInfo
- Publication number
- JPS57143950A JPS57143950A JP56030271A JP3027181A JPS57143950A JP S57143950 A JPS57143950 A JP S57143950A JP 56030271 A JP56030271 A JP 56030271A JP 3027181 A JP3027181 A JP 3027181A JP S57143950 A JPS57143950 A JP S57143950A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- circuit
- transmission
- analog
- digital
- 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
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/04—Control of transmission; Equalising
- H04B3/10—Control of transmission; Equalising by pilot signal
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
Abstract
PURPOSE:To monitor a fault on an A/D transmission line continuously by signal processing at a reception side without transmitting and receiving a control signal between a transmission and a reception side, by detecting the switching control period of the A/D signal of the transmission side by the state change of an output signal of detection of a pilot signal. CONSTITUTION:An analog signal 1 and a digital signal 2 are generated by analog and digital pilot signal generating circuits 106 and 107, and are alternated at a constant period T in an A/D converting circuit 104 by a control signal 3 from a switching control circuit 105 to be transmitted from a transmitting circuit 103. This signal is received by a receiving circuit 108, and is branched to pilot detecting circuits 111 and 112 for analog and digital transmission through a demodulating circuit 109 for analog transmission and a demodulating circuit 110 for digital transmission. Then, state change signals 5 and 6 from those circuits 111 and 112 are applied to a phase comparing circuit 116 and the 1st and 2nd change point detecting circuits 113 to detect a switching control period, thereby monitoring a fault on an A/D transmission line continuously.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56030271A JPS57143950A (en) | 1981-03-03 | 1981-03-03 | Monitoring circuit for auxiliary circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56030271A JPS57143950A (en) | 1981-03-03 | 1981-03-03 | Monitoring circuit for auxiliary circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS57143950A true JPS57143950A (en) | 1982-09-06 |
Family
ID=12299032
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP56030271A Pending JPS57143950A (en) | 1981-03-03 | 1981-03-03 | Monitoring circuit for auxiliary circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57143950A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002013379A3 (en) * | 2000-08-04 | 2003-03-06 | Scientific Atlanta | Amplifier with a universal automatic gain control circuit |
-
1981
- 1981-03-03 JP JP56030271A patent/JPS57143950A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002013379A3 (en) * | 2000-08-04 | 2003-03-06 | Scientific Atlanta | Amplifier with a universal automatic gain control circuit |
US6995806B1 (en) | 2000-08-04 | 2006-02-07 | Scientific-Atlanta, Inc. | Amplifier with a universal automatic gain control circuit |
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