JPH01169835U - - Google Patents
Info
- Publication number
- JPH01169835U JPH01169835U JP6615688U JP6615688U JPH01169835U JP H01169835 U JPH01169835 U JP H01169835U JP 6615688 U JP6615688 U JP 6615688U JP 6615688 U JP6615688 U JP 6615688U JP H01169835 U JPH01169835 U JP H01169835U
- Authority
- JP
- Japan
- Prior art keywords
- field strength
- signal
- receiving
- digital signal
- frequency signal
- 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
- 238000001514 detection method Methods 0.000 claims description 4
- 230000005684 electric field Effects 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 1
Landscapes
- Noise Elimination (AREA)
- Circuits Of Receivers In General (AREA)
Description
第１図は本考案の一実施例の受信装置１の電気
的構成を示すブロツク図、第２図はアンテナ２で
受信される受信信号の変調方法を説明するための
波形図、第３図はＢＰＦ１１，１２およびＨＰＦ
１３の周波数特性を示すグラフ、第４図は本考案
の他の実施例の受信装置３１の電気的構成を示す
ブロツク図、第５図は本考案のさらに他の実施例
の受信装置４１の電気的構成を示すブロツク図、
第６図は受信装置４１に用いられるＢＰＦ４２の
周波数特性を示すグラフ、第７図は本考案の他の
実施例の受信装置５１の電気的構成を示すブロツ
ク図である。
１，３１，４１，５１……受信装置、１０，２
２……検波回路、１１，１２，４２……ＢＰＦ、
１３……ＨＰＦ、１４，１６……スイツチング回
路、２３，３３……レベル弁別回路、２４，３４
……反転バツフア、３２……整流回路、４３……
ノイズスケルチ回路。
FIG. 1 is a block diagram showing the electrical configuration of a receiving device 1 according to an embodiment of the present invention, FIG. 2 is a waveform diagram illustrating a method of modulating a received signal received by an antenna 2, and FIG. BPF11, 12 and HPF
4 is a block diagram showing the electrical configuration of a receiving device 31 according to another embodiment of the present invention. FIG. 5 is a graph showing the electrical configuration of a receiving device 41 according to yet another embodiment of the present invention. A block diagram showing the physical configuration,
FIG. 6 is a graph showing the frequency characteristics of the BPF 42 used in the receiving device 41, and FIG. 7 is a block diagram showing the electrical configuration of the receiving device 51 according to another embodiment of the present invention. 1, 31, 41, 51...Receiving device, 10, 2
2...Detection circuit, 11, 12, 42...BPF,
13... HPF, 14, 16... Switching circuit, 23, 33... Level discrimination circuit, 24, 34
...Inverting buffer, 32... Rectifier circuit, 43...
Noise squelch circuit.
Claims (1)
号を受信する受信手段と、 前記受信手段によつて受信された高周波信号を
復調する復調手段と、 前記復調手段によつて復調された信号を通過し
、その通過帯域を変化することができるバンドパ
スフイルタと、 前記高周波信号の受信電界強度を検出する電界
強度検出手段と、 前記電界強度検出手段の出力に応答し、受信電
界強度が高いときには前記バンドパスフイルタの
通過帯域を広くし、受信電界強度が低いときには
前記通過帯域を狭くする制御手段とを含むことを
特徴とするデジタル信号の受信装置。 (2) 前記高周波信号は、デジタル信号の論理値
に対応した周波数を有する信号を変調波としてお
り、この変調波によつて搬送波を変調することを
特徴とする実用新案登録請求の範囲第１項記載の
デジタル信号の受信装置。[Claims for Utility Model Registration] (1) Receiving means for receiving a high frequency signal modulated by a digital signal; demodulating means for demodulating the high frequency signal received by the receiving means; a bandpass filter that can pass the demodulated signal and change its pass band; a field strength detection means that detects the received field strength of the high frequency signal; and a field strength detection means that responds to the output of the field strength detection means. . A digital signal receiving apparatus, comprising: control means for widening the pass band of the bandpass filter when the received electric field strength is high, and narrowing the pass band when the received electric field strength is low. (2) The above-mentioned high-frequency signal has a signal having a frequency corresponding to a logical value of a digital signal as a modulating wave, and a carrier wave is modulated by this modulating wave, Claim 1 of the Utility Model Registration Claim A receiving device for the digital signal described above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6615688U JPH01169835U (en) | 1988-05-18 | 1988-05-18 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6615688U JPH01169835U (en) | 1988-05-18 | 1988-05-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01169835U true JPH01169835U (en) | 1989-11-30 |
Family
ID=31291568
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6615688U Pending JPH01169835U (en) | 1988-05-18 | 1988-05-18 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01169835U (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53890A (en) * | 1976-06-24 | 1978-01-07 | Casio Comput Co Ltd | Interconnector |
| JPS56102131A (en) * | 1980-01-18 | 1981-08-15 | Sharp Corp | Improvement of sn ratio of fm receiver of extra high frequency band |
| JPS5784628A (en) * | 1980-11-17 | 1982-05-27 | Fujitsu Ltd | Mobile radio device |
-
1988
- 1988-05-18 JP JP6615688U patent/JPH01169835U/ja active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53890A (en) * | 1976-06-24 | 1978-01-07 | Casio Comput Co Ltd | Interconnector |
| JPS56102131A (en) * | 1980-01-18 | 1981-08-15 | Sharp Corp | Improvement of sn ratio of fm receiver of extra high frequency band |
| JPS5784628A (en) * | 1980-11-17 | 1982-05-27 | Fujitsu Ltd | Mobile radio device |
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