JPS56153871A - Receiving system for signal-frequency signal - Google Patents
Receiving system for signal-frequency signalInfo
- Publication number
- JPS56153871A JPS56153871A JP5552180A JP5552180A JPS56153871A JP S56153871 A JPS56153871 A JP S56153871A JP 5552180 A JP5552180 A JP 5552180A JP 5552180 A JP5552180 A JP 5552180A JP S56153871 A JPS56153871 A JP S56153871A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- frequency
- output
- input
- significant
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q1/00—Details of selecting apparatus or arrangements
- H04Q1/18—Electrical details
- H04Q1/30—Signalling arrangements; Manipulation of signalling currents
- H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
- H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
- H04Q1/446—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
PURPOSE:To shorten a detection time to prevent the voice malfunction, by providing a narrow-band filter having the center frequency different from a significant signal, an amplitude limiter, and a signal frequency detecting circuit, in the single frequency receiving system with frequency f1 Hz as the significant signal. CONSTITUTION:The receiving signal input to input terminal 2-1 is input to single tuned circuit 2-2 and is subjected to narrow-band filtering of center frequency f2 Hz different from significant signal f1 Hz. Consequently, in the output signal of single tuned circuit 2-2, frequency f2 Hz is emphasized. If the input signal is voice or the like, a waveform approximating the sine wave of f2 Hz is output. If the input signal consists of only frequency f1 Hz of the significant signal, the sine-wave of f1 Hz is output. These output signals f2 Hz and f1 Hz are converted into square waves and have only the signal of f1+ or -DELTAf1 Hz detected by single frequency detector 2-4. After integrating said signal, its output is output from output terminal 2-6.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5552180A JPS56153871A (en) | 1980-04-28 | 1980-04-28 | Receiving system for signal-frequency signal |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5552180A JPS56153871A (en) | 1980-04-28 | 1980-04-28 | Receiving system for signal-frequency signal |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS56153871A true JPS56153871A (en) | 1981-11-28 |
JPH022340B2 JPH022340B2 (en) | 1990-01-17 |
Family
ID=13001006
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP5552180A Granted JPS56153871A (en) | 1980-04-28 | 1980-04-28 | Receiving system for signal-frequency signal |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS56153871A (en) |
-
1980
- 1980-04-28 JP JP5552180A patent/JPS56153871A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPH022340B2 (en) | 1990-01-17 |
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