JPS644128A - Pcm modulation demodulation circuit - Google Patents
Pcm modulation demodulation circuitInfo
- Publication number
- JPS644128A JPS644128A JP15908287A JP15908287A JPS644128A JP S644128 A JPS644128 A JP S644128A JP 15908287 A JP15908287 A JP 15908287A JP 15908287 A JP15908287 A JP 15908287A JP S644128 A JPS644128 A JP S644128A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- sampling frequency
- pcm
- constitution
- lpf
- 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
- 238000005070 sampling Methods 0.000 abstract 6
- 239000003990 capacitor Substances 0.000 abstract 2
- 101710134395 Carboxy-terminal domain RNA polymerase II polypeptide A small phosphatase 1 Proteins 0.000 abstract 1
- 102100025483 Retinoid-inducible serine carboxypeptidase Human genes 0.000 abstract 1
- PUPNJSIFIXXJCH-UHFFFAOYSA-N n-(4-hydroxyphenyl)-2-(1,1,3-trioxo-1,2-benzothiazol-2-yl)acetamide Chemical compound C1=CC(O)=CC=C1NC(=O)CN1S(=O)(=O)C2=CC=CC=C2C1=O PUPNJSIFIXXJCH-UHFFFAOYSA-N 0.000 abstract 1
Landscapes
- Analogue/Digital Conversion (AREA)
- Filters That Use Time-Delay Elements (AREA)
- Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
Abstract
PURPOSE:To obtain an LPF following surely a change in a sampling frequency with simple circuit constitution by setting a switching frequency to drive a switched capacitor filter to a constant multiple of a PCM sampling frequency. CONSTITUTION:A PCM modulation circuit consists of a switched capacitor (SCP)1 constituted as an LPF, an A/D converter 2 and a frequency divider 3. Through the constitution above, the cut-off frequency of the SCP1 is set to fs/2 or below with respect to the sampling frequency fs. In varying the sampling frequency in the PCM modulating circuit, a clock signal fc synchronizing therewith is varied. Then a PCM demodulating circuit consists of a D/A converter 7, an SCP 8 and a frequency divider 9. Through such constitution as above, when the sampling frequency fs is changed, the cut-off frequency of the LPF is varied in following to the change in the sampling frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15908287A JPS644128A (en) | 1987-06-26 | 1987-06-26 | Pcm modulation demodulation circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15908287A JPS644128A (en) | 1987-06-26 | 1987-06-26 | Pcm modulation demodulation circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS644128A true JPS644128A (en) | 1989-01-09 |
Family
ID=15685832
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15908287A Pending JPS644128A (en) | 1987-06-26 | 1987-06-26 | Pcm modulation demodulation circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS644128A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007151847A (en) * | 2005-12-06 | 2007-06-21 | Heiwa Mannequin Co Ltd | Supporting clasp |
| US8067469B2 (en) | 2002-05-08 | 2011-11-29 | Woodstream Corporation | System for trapping flying insects with attractant lures |
-
1987
- 1987-06-26 JP JP15908287A patent/JPS644128A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8067469B2 (en) | 2002-05-08 | 2011-11-29 | Woodstream Corporation | System for trapping flying insects with attractant lures |
| US8470881B2 (en) | 2002-05-08 | 2013-06-25 | Woodstream Corporation | System for trapping flying insects with attractant lures |
| JP2007151847A (en) * | 2005-12-06 | 2007-06-21 | Heiwa Mannequin Co Ltd | Supporting clasp |
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