JPH01171146U - - Google Patents
Info
- Publication number
- JPH01171146U JPH01171146U JP6164488U JP6164488U JPH01171146U JP H01171146 U JPH01171146 U JP H01171146U JP 6164488 U JP6164488 U JP 6164488U JP 6164488 U JP6164488 U JP 6164488U JP H01171146 U JPH01171146 U JP H01171146U
- Authority
- JP
- Japan
- Prior art keywords
- phase
- roll
- waveform
- output
- modulation circuit
- 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
- 230000005540 biological transmission Effects 0.000 claims description 2
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 2
- 238000001228 spectrum Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
- 230000010356 wave oscillation Effects 0.000 description 1
Landscapes
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Description
第１図はこの考案の一実施例の構成を示すブロ
ツク図。第２図はこの考案の一実施例におけるベ
ースバンド信号、ベースバンド伝送クロツク信号
およびテスト信号のタイミング図。第３図は４相
ＰＳＫ変調信号のベクトル図。
１……テスト信号生成回路、１１……４分周器
、１２……シフトレジスタ、２……マルチプレク
サ、３……入力切替スイツチ、４および５……ロ
ールオフフイルタ、６……４相ＰＳＫ変調回路、
６１……搬送波発振回路、６２……π２移相器、
６３および６４……２相ＰＳＫ変調回路。
FIG. 1 is a block diagram showing the configuration of an embodiment of this invention. FIG. 2 is a timing diagram of a baseband signal, a baseband transmission clock signal, and a test signal in one embodiment of this invention. FIG. 3 is a vector diagram of a four-phase PSK modulation signal. 1...Test signal generation circuit, 1 1 ...4 frequency divider, 1 2 ...Shift register, 2...Multiplexer, 3...Input selection switch, 4 and 5...Roll-off filter, 6...4 phase PSK modulation circuit,
6 1 ... carrier wave oscillation circuit, 6 2 ... π2 phase shifter,
6 3 and 6 4 ... 2-phase PSK modulation circuit.
Claims (1)
する２相のテスト信号をベースバンド伝送クロツ
ク信号から生成するテスト信号生成回路と、ベー
スバンド信号とテスト信号との一方を選択して出
力する選択手段と、選択手段からの出力を入力と
して高周波成分を除去し、かつロールオフスペク
トル特性を持つ波形に成形するロールオフフイル
タと、ロールオフフイルタの出力の振幅と直流成
分オフセツトをおよび移相器の移相量を調整する
調整手段とを備えたことを特徴とする４相ＰＳＫ
変調回路。 In a 4-phase PSK modulation circuit, a test signal generation circuit generates two-phase test signals whose phases are orthogonal to each other from a baseband transmission clock signal, and selection means selects and outputs one of the baseband signal and the test signal. A roll-off filter receives the output from the selection means, removes high-frequency components, and shapes the waveform into a waveform having roll-off spectrum characteristics, and calculates the amplitude and DC component offset of the output of the roll-off filter, and the shift of the phase shifter. 4-phase PSK characterized by comprising an adjustment means for adjusting the phase amount.
Modulation circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6164488U JPH0349486Y2 (en) | 1988-05-12 | 1988-05-12 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6164488U JPH0349486Y2 (en) | 1988-05-12 | 1988-05-12 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01171146U true JPH01171146U (en) | 1989-12-04 |
| JPH0349486Y2 JPH0349486Y2 (en) | 1991-10-22 |
Family
ID=31287299
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6164488U Expired JPH0349486Y2 (en) | 1988-05-12 | 1988-05-12 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0349486Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0563741A (en) * | 1991-08-30 | 1993-03-12 | Kenwood Corp | Parallel msk modulation system |
-
1988
- 1988-05-12 JP JP6164488U patent/JPH0349486Y2/ja not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0563741A (en) * | 1991-08-30 | 1993-03-12 | Kenwood Corp | Parallel msk modulation system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0349486Y2 (en) | 1991-10-22 |
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