JPS6421517U - - Google Patents
Info
- Publication number
- JPS6421517U JPS6421517U JP11586887U JP11586887U JPS6421517U JP S6421517 U JPS6421517 U JP S6421517U JP 11586887 U JP11586887 U JP 11586887U JP 11586887 U JP11586887 U JP 11586887U JP S6421517 U JPS6421517 U JP S6421517U
- Authority
- JP
- Japan
- Prior art keywords
- output
- pass filter
- low
- mixer
- converter
- 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
- 238000006243 chemical reaction Methods 0.000 claims 1
- 238000000034 method Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 7
Landscapes
- Filters And Equalizers (AREA)
Description
第1図は本考案の一実施例の構成を示すブロツ
ク図。第2図は本考案の一実施例の作用の説明に
供する周波数成分を示す模式図。第3図は本考案
の一実施例におけるバンドパスフイルタ8の周波
数特性図。第4図は本考案の一実施例におけるバ
ンドパスフイルタ9の周波数特性図。第5図は従
来方式の構成を示すブロツク図。第6図は従来方
式に用いられたローパスフイルタ4の周波数特性
図。第7図は従来方式に要求されるバンドパスフ
イルタ7の周波数特性図。
1……D/A変換器、2……アナログスイツチ
、3……制御回路、5……ミクサー、6……局部
発振器、8および9……バンドパスフイルタ。
FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. FIG. 2 is a schematic diagram showing frequency components for explaining the operation of an embodiment of the present invention. FIG. 3 is a frequency characteristic diagram of the bandpass filter 8 in one embodiment of the present invention. FIG. 4 is a frequency characteristic diagram of the bandpass filter 9 in one embodiment of the present invention. FIG. 5 is a block diagram showing the configuration of a conventional system. FIG. 6 is a frequency characteristic diagram of the low-pass filter 4 used in the conventional system. FIG. 7 is a frequency characteristic diagram of the bandpass filter 7 required in the conventional system. DESCRIPTION OF SYMBOLS 1...D/A converter, 2...Analog switch, 3...Control circuit, 5...Mixer, 6...Local oscillator, 8 and 9...Band pass filter.
Claims (1)
るD/A変換器と、D/A変換器の出力を入力と
するローパスフイルタと、ローパスフイルタの出
力と局部発振器からの出力とを周波数混合するミ
クサーと、ミクサーの出力を入力とする第1のバ
ンドパスフイルタとを備えた周波数変換方式にお
いて、上記ローパスフイルタに代つて第2のバン
ドパスフイルタを用いたことを特徴とする周波数
変換方式。 A D/A converter that converts input digital data into an analog signal, a low-pass filter that receives the output of the D/A converter, a mixer that mixes the frequencies of the output of the low-pass filter and the output from the local oscillator, and the mixer. 1. A frequency conversion method comprising: a first bandpass filter that receives the output of the above-described low-pass filter;
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1987115868U JPH0336095Y2 (en) | 1987-07-30 | 1987-07-30 | |
US07/198,576 US4855894A (en) | 1987-05-25 | 1988-05-25 | Frequency converting apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1987115868U JPH0336095Y2 (en) | 1987-07-30 | 1987-07-30 |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6421517U true JPS6421517U (en) | 1989-02-02 |
JPH0336095Y2 JPH0336095Y2 (en) | 1991-07-31 |
Family
ID=31357902
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1987115868U Expired JPH0336095Y2 (en) | 1987-05-25 | 1987-07-30 |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0336095Y2 (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60174505A (en) * | 1984-02-20 | 1985-09-07 | Nec Corp | Frequency converter |
-
1987
- 1987-07-30 JP JP1987115868U patent/JPH0336095Y2/ja not_active Expired
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60174505A (en) * | 1984-02-20 | 1985-09-07 | Nec Corp | Frequency converter |
Also Published As
Publication number | Publication date |
---|---|
JPH0336095Y2 (en) | 1991-07-31 |
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