KR900001837U - Tone detection circuit - Google Patents
Tone detection circuitInfo
- Publication number
- KR900001837U KR900001837U KR2019880009890U KR880009890U KR900001837U KR 900001837 U KR900001837 U KR 900001837U KR 2019880009890 U KR2019880009890 U KR 2019880009890U KR 880009890 U KR880009890 U KR 880009890U KR 900001837 U KR900001837 U KR 900001837U
- Authority
- KR
- South Korea
- Prior art keywords
- detection circuit
- tone detection
- tone
- circuit
- detection
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/82—Line monitoring circuits for call progress or status discrimination
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Devices For Supply Of Signal Current (AREA)
- Interface Circuits In Exchanges (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR2019880009890U KR910001887Y1 (en) | 1988-06-25 | 1988-06-25 | Tone detection circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR2019880009890U KR910001887Y1 (en) | 1988-06-25 | 1988-06-25 | Tone detection circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
KR900001837U true KR900001837U (en) | 1990-01-19 |
KR910001887Y1 KR910001887Y1 (en) | 1991-03-28 |
Family
ID=19276690
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR2019880009890U KR910001887Y1 (en) | 1988-06-25 | 1988-06-25 | Tone detection circuit |
Country Status (1)
Country | Link |
---|---|
KR (1) | KR910001887Y1 (en) |
-
1988
- 1988-06-25 KR KR2019880009890U patent/KR910001887Y1/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
KR910001887Y1 (en) | 1991-03-28 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
A201 | Request for examination | ||
N231 | Notification of change of applicant | ||
E701 | Decision to grant or registration of patent right | ||
REGI | Registration of establishment | ||
FPAY | Annual fee payment |
Payment date: 20010223 Year of fee payment: 11 |
|
LAPS | Lapse due to unpaid annual fee |