JPS5252508A - Frequency discrimination circuit - Google Patents
Frequency discrimination circuitInfo
- Publication number
- JPS5252508A JPS5252508A JP12828075A JP12828075A JPS5252508A JP S5252508 A JPS5252508 A JP S5252508A JP 12828075 A JP12828075 A JP 12828075A JP 12828075 A JP12828075 A JP 12828075A JP S5252508 A JPS5252508 A JP S5252508A
- Authority
- JP
- Japan
- Prior art keywords
- discrimination circuit
- frequency discrimination
- recording
- telephone
- discriminated
- 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
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/64—Automatic arrangements for answering calls; Automatic arrangements for recording messages for absent subscribers; Arrangements for recording conversations
- H04M1/65—Recording arrangements for recording a message from the calling party
- H04M1/654—Telephone line monitoring circuits therefor, e.g. ring detectors
-
- 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)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12828075A JPS5252508A (en) | 1975-10-27 | 1975-10-27 | Frequency discrimination circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12828075A JPS5252508A (en) | 1975-10-27 | 1975-10-27 | Frequency discrimination circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5252508A true JPS5252508A (en) | 1977-04-27 |
Family
ID=14980909
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12828075A Pending JPS5252508A (en) | 1975-10-27 | 1975-10-27 | Frequency discrimination circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5252508A (ja) |
-
1975
- 1975-10-27 JP JP12828075A patent/JPS5252508A/ja active Pending
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