JPS637509B2 - - Google Patents
Info
- Publication number
- JPS637509B2 JPS637509B2 JP55034456A JP3445680A JPS637509B2 JP S637509 B2 JPS637509 B2 JP S637509B2 JP 55034456 A JP55034456 A JP 55034456A JP 3445680 A JP3445680 A JP 3445680A JP S637509 B2 JPS637509 B2 JP S637509B2
- Authority
- JP
- Japan
- Prior art keywords
- dft
- circuit
- signal
- frequency
- output
- 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.)
- Expired
Links
- 230000010354 integration Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 description 36
- 238000012545 processing Methods 0.000 description 34
- 230000006870 function Effects 0.000 description 26
- 238000003775 Density Functional Theory Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 9
- 230000001186 cumulative effect Effects 0.000 description 8
- 238000001514 detection method Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- 238000005070 sampling Methods 0.000 description 6
- 108010076504 Protein Sorting Signals Proteins 0.000 description 5
- 238000004364 calculation method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000011664 signaling Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000005236 sound signal Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 2
- 238000013139 quantization Methods 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000011426 transformation method Methods 0.000 description 1
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
- H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling
- H04Q1/457—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling with conversion of multifrequency signals into digital signals
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3445680A JPS56131286A (en) | 1980-03-18 | 1980-03-18 | Digital multifrequency signal receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3445680A JPS56131286A (en) | 1980-03-18 | 1980-03-18 | Digital multifrequency signal receiver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56131286A JPS56131286A (en) | 1981-10-14 |
| JPS637509B2 true JPS637509B2 (enrdf_load_stackoverflow) | 1988-02-17 |
Family
ID=12414743
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3445680A Granted JPS56131286A (en) | 1980-03-18 | 1980-03-18 | Digital multifrequency signal receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56131286A (enrdf_load_stackoverflow) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003174522A (ja) | 2001-12-06 | 2003-06-20 | Ricoh Co Ltd | トーン検出器 |
-
1980
- 1980-03-18 JP JP3445680A patent/JPS56131286A/ja active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56131286A (en) | 1981-10-14 |
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