JPH0456552A - Fsk signal receiver - Google Patents
Fsk signal receiverInfo
- Publication number
- JPH0456552A JPH0456552A JP2167687A JP16768790A JPH0456552A JP H0456552 A JPH0456552 A JP H0456552A JP 2167687 A JP2167687 A JP 2167687A JP 16768790 A JP16768790 A JP 16768790A JP H0456552 A JPH0456552 A JP H0456552A
- Authority
- JP
- Japan
- Prior art keywords
- band
- frequency
- receiver
- intermediate frequency
- fsk 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
- 238000003379 elimination reaction Methods 0.000 claims abstract description 14
- 230000008030 elimination Effects 0.000 claims abstract description 13
- 238000006243 chemical reaction Methods 0.000 claims abstract description 6
- 230000035945 sensitivity Effects 0.000 abstract description 5
- 230000005540 biological transmission Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 230000000903 blocking effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 6
- 230000003321 amplification Effects 0.000 description 5
- 238000003199 nucleic acid amplification method Methods 0.000 description 5
- 239000002131 composite material Substances 0.000 description 4
- 230000010355 oscillation Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 101100111270 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) BCH2 gene Proteins 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
Landscapes
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明はＦＳＫ変調信号を復調してＮＲＺのディジタル
信号を出力して、信号処理をするＦＳＫ信号受信装置に
関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an FSK signal receiving apparatus that demodulates an FSK modulated signal, outputs an NRZ digital signal, and processes the signal.
従来の技術
第４図は一般的なＦＳＫ変調信号の受信装置のブロック
図を示している。第４図において、１はアンテナであり
、２は高周波増幅回路、３はトップエンドのフィルタで
周波数変換回路４で発生するイメージ周波数での選択度
を確保している。６は局部発振回路で、受信キャリア信
号と周波数変換回路４で混合させて中間周波数を出力す
る。６゜８は中間周波数増幅回路、７はバンドパスフィ
ルタで隣接妨害波に対する選択度を確保している。BACKGROUND OF THE INVENTION FIG. 4 shows a block diagram of a general FSK modulated signal receiving apparatus. In FIG. 4, 1 is an antenna, 2 is a high frequency amplification circuit, and 3 is a top-end filter that ensures selectivity at the image frequency generated in the frequency conversion circuit 4. 6 is a local oscillation circuit which mixes the received carrier signal with the frequency conversion circuit 4 and outputs an intermediate frequency. 6.8 is an intermediate frequency amplification circuit, and 7 is a band pass filter to ensure selectivity against adjacent interference waves.
９はリミッタ−１１ｏは復調器、１１は波形整形回路で
、ＦＳＫ信号からディジタル信号を高力する。9 is a limiter, 11o is a demodulator, and 11 is a waveform shaping circuit, which converts the FSK signal into a digital signal.
バンドパスフィルタ了の通過域が広い程、受信可能の帯
域幅が広くなり、送信機および局部発振回路５の周波数
偏差を大きくできるが、Ｓ／Ｎ比が悪くなる。又、バン
ドパスフィルり７の通過域が狭い程、Ｓ／Ｎ比が良くな
るが、受信可能な帯域幅が狭くなってしまう。The wider the passband of the bandpass filter, the wider the receivable bandwidth, and the greater the frequency deviation of the transmitter and local oscillation circuit 5, but the worse the S/N ratio becomes. Further, the narrower the passband of the bandpass filter 7, the better the S/N ratio becomes, but the receivable bandwidth becomes narrower.
以上よりバンドパスフィルタ了の通過域は第５図に示す
様に、ＦＳＫ変調信号の周波数偏移をＡ［Ｈ２］、受信
装置の帯域幅をＢ（Ｈｚ、：ｌとすると、中間周波数ｆ
０を中心にｅｄＢ低下時の帯域幅を２（Ａ＋Ｂ）〔１−
（ｚｌを確保する様している。From the above, the passband of the bandpass filter is, as shown in Figure 5, the intermediate frequency f, assuming that the frequency deviation of the FSK modulated signal is A[H2] and the bandwidth of the receiving device is B(Hz, :l).
The bandwidth when edB decreases is 2 (A + B) [1-
(I am trying to secure zl.
発明が解決しようとする課題
しかしながら、上記従来のＦＳＫ変調信号の受信装置で
は、バンドパスフィルり７の通過域で、受信装置の帯域
幅が定まるため、他の条件を同様とすると、フィルタの
通過域を広くしなければならない場合には、Ｓ／Ｎ比が
劣化するという問題があった。Problems to be Solved by the Invention However, in the conventional FSK modulated signal receiving device described above, the bandwidth of the receiving device is determined by the passband of the bandpass filter 7. When the range has to be widened, there is a problem that the S/N ratio deteriorates.
本発明はこのような従来の問題を改善するものであり、
受信装置の帯域幅を狭くすることなく、Ｓ／Ｎ比を良く
して、ＦＳＫ変調；言号を復調してＮＲＺのディジタル
信号を得るＦＳＫ信号受信装置を提供することを目的と
するものである。The present invention improves these conventional problems,
The purpose of the present invention is to provide an FSK signal receiving device that improves the S/N ratio without narrowing the bandwidth of the receiving device and demodulates FSK modulation and speech signals to obtain an NRZ digital signal. .
課題を解決するための手段
本発明は上記目的を達成するために、中間周波数におい
て隣接妨害波の選択度を確保するバンドパスフィルタ以
外に、さらに狭帯域のバンドエリミネーションフィルタ
を備えたものである。Means for Solving the Problems In order to achieve the above object, the present invention is provided with a band-elimination filter with a narrow band in addition to a band-pass filter that ensures selectivity of adjacent interference waves at an intermediate frequency. .
作 用
したがって、本発明によれば、受信装置の帯域幅に影響
を与えずに、雑音成分の帯域を狭くすることにより、Ｓ
／Ｎ比を良くして、受信装置の呼出感度を良くするとい
う効果を有する。Therefore, according to the present invention, by narrowing the band of noise components without affecting the bandwidth of the receiving device, S
This has the effect of improving the /N ratio and improving the calling sensitivity of the receiving device.
実施例
第１図は本発明の一実施例の構成を示すものである。第
１図において１〜１１までは、第３図における１〜１１
と全く同様であり、説明を省略する。１２はバンドエリ
ミネーションフィルタである。ＦＳＫ変調の周波数偏移
を士ＡＣＨｚ〕、受信装置の帯域幅を士Ｂ（Ｈｚｌとす
ると、バンドエリミネーションフィルタの減衰域は第２
図に示すように２（Ａ−Ｂ）（：田〕となる。Embodiment FIG. 1 shows the configuration of an embodiment of the present invention. 1 to 11 in Figure 1 are 1 to 11 in Figure 3.
It is exactly the same as , and the explanation will be omitted. 12 is a band elimination filter. If the frequency deviation of FSK modulation is 2 ACHz] and the bandwidth of the receiving device is 2 ACHz, then the attenuation range of the band elimination filter is
As shown in the figure, it becomes 2(A-B)(:田).
この場合、ｆｏ＋Ａ［田］のＦＳＫ信号は減衰すること
がなく、−力士ＢＣＨ２）の帯域を確保させるとした場
合、バンドパスフィルタ７の帯域幅ば
２（Ａ＋Ｂ）Ｉ：庵〕 ・・・・・・・・・■トナ
リ、バンドパスフィルタ７と、バンドエリミネーション
フィルター２の合成特性は
２（Ａ十Ｂ）−２（Ａ−Ｂ）＝４Ｂ・・・■となるので
、■−■の２（Ａ−Ｂ）の分だけ、雑音成分の帯域が狭
くなるために、Ｓ／Ｎ比を改善することができるという
利点を有する。但し、ＦＳＫ変調の信号はｆ。＋Ａ［庵
〕とｆｏ−Ａ［ル〕の成分のみであるから、フィルタの
通過域がｆ ＋、Ａ＋ＢＣ庵〕 ・・・・・・・
・・■と
ｆｏ−Ａ＋：ＢＣ用〕 ・・・・・・・・・■で確保
させた場合には、バンドエリミネーションフィルタ１２
を備えても、受信装置の帯域幅に影響を与えない。In this case, the FSK signal of fo+A[田] does not attenuate, and if the band of - sumo wrestler BCH2) is secured, the bandwidth of the bandpass filter 7 is 2(A+B)I:an]... ...■ Tonari, the composite characteristic of band pass filter 7 and band elimination filter 2 is 2 (A + B) - 2 (A - B) = 4B...■, so ■ - ■ Since the band of the noise component is narrowed by 2(A-B), it has the advantage that the S/N ratio can be improved. However, the signal of FSK modulation is f. Since there are only components of +A [an] and fo-A [ru], the passband of the filter is f +, A + BC an] ...
・・■ and fo-A+: for BC] ・・・・・・・・・When secured with ■, band elimination filter 12
does not affect the bandwidth of the receiving device.
第６図は、バンドパスフィルタ７とバンドエリミネーシ
ョンフィルタ１２の合成特性を示している。すなわち、
第５図に示したバンドパスフィルタ７の特性と第２図に
示したバンドエリミネーションフィルタ１２の特性との
合成特性でｆ。−Ａとす。＋Ａを中心にした各々２Ｂの
幅の通過域を有している。FIG. 6 shows the composite characteristics of the band pass filter 7 and the band elimination filter 12. That is,
f is the composite characteristic of the characteristics of the bandpass filter 7 shown in FIG. 5 and the characteristics of the band elimination filter 12 shown in FIG. -A. Each passband has a width of 2B centered on +A.
なお、上記の実施例では、バンドパスフィルタ７とバン
ドエリミネーションフィルタ１２を独立して考えている
が、これらの変りに第６図に示すような、ｆ ｏ ＋
Ａ十ＢＣ１−［Ｚ〕とｆ。−Ａ＋Ｂ（庵〕の２つの通過
域を有する２つのバンドパスフィルりで構成することも
できる。In the above embodiment, the band pass filter 7 and the band elimination filter 12 are considered independently, but instead of these, f o + as shown in FIG.
A1BC1-[Z] and f. It can also be configured with two bandpass filters having two passbands -A+B (hermitage).
発明の効果
本発明は上記実施例よシ明らかなように、ＦＳＫ変調の
受信装置のＳ／Ｎ比を改善したものであり、ディジタル
伝送の受信装置の呼出感度を良くするという利点を有す
る。そのことは、無線ディジタル通信において、感度劣
化を伴う伝送速度の高速化が進もうとしている昨今にお
いて、受信装置の使用範囲を著しく狭くすることを緩和
する方法の１つとなりうるものである。Effects of the Invention As is clear from the above embodiments, the present invention improves the S/N ratio of an FSK modulation receiving device, and has the advantage of improving the calling sensitivity of a digital transmission receiving device. This can be one of the methods for alleviating the significant narrowing of the usable range of a receiving device, in the recent times when wireless digital communications are becoming faster in transmission speeds, accompanied by deterioration in sensitivity.
第１図は本発明のＦＳＫ信号受信装置のブロック図、第
２図は本発明に使用されるバンドエリミネーションフィ
ルタの特性図、第３図は本発明の実施例における合成フ
ィルり特性図、第４図は従来の一般的なＦＳＫ信号受信
装置のブロック図、第５図は従来のＦＳＫ信号受信装置
のメインのバンドパスフィルタの特性図である。
１・・・・・・アンテナ、２・・・・・・高周波増幅回
路、３・・・・・・バンドパスフィルタ、４・・・・・
・周波数変換回路、５・・・・・・局部発振回路、６・
・・・・・中間周波数増幅回路、７・・・・・・バンド
パスフィルタ、８・・・・・・中間周波数増幅回路、９
・・・・・・リミッタ−５１ｏ・・・・・・復調器、１
１・・・・・・波形整形回路、１２・・・・・・バンド
エリミネーションフィルタ。
代理人の氏名 弁理士 粟 野 重 孝 ほか１名−Ａ
Ｔｈ＋ＡFIG. 1 is a block diagram of the FSK signal receiving device of the present invention, FIG. 2 is a characteristic diagram of a band elimination filter used in the present invention, FIG. 3 is a composite fill characteristic diagram in an embodiment of the present invention, and FIG. FIG. 4 is a block diagram of a conventional general FSK signal receiving apparatus, and FIG. 5 is a characteristic diagram of the main bandpass filter of the conventional FSK signal receiving apparatus. 1...Antenna, 2...High frequency amplification circuit, 3...Band pass filter, 4...
・Frequency conversion circuit, 5...Local oscillation circuit, 6.
...Intermediate frequency amplification circuit, 7...Band pass filter, 8...Intermediate frequency amplification circuit, 9
...Limiter-51o...Demodulator, 1
1... Waveform shaping circuit, 12... Band elimination filter. Name of agent: Patent attorney Shigetaka Awano and 1 other person -A Th+A
Claims (4)
する周波数変換回路と、中間周波数において隣接妨害波
に対する選択度を有するバンドパスフィルタと、中間周
波数近傍の狭帯域の通過を阻止するバンドエリミネーシ
ョンフィルタとを備えたＦＳＫ信号受信装置。(1) A frequency conversion circuit that converts the received high-frequency FSK signal to an intermediate frequency, a bandpass filter that has selectivity to adjacent interference waves at the intermediate frequency, and a band elimination that blocks passage of a narrow band near the intermediate frequency. An FSK signal receiving device equipped with a filter.
をＢとしたとき、バンドパスフィルタの特性を２（Ａ＋
Ｂ）、バンドエリミネーションフィルタの特性を２（Ａ
−Ｂ）とした請求項１記載のＦＳＫ信号受信装置。(2) When the frequency deviation of the FSK signal is A and the bandwidth of the receiving device is B, the characteristics of the bandpass filter are 2(A+
B), the characteristics of the band elimination filter are 2(A
-B). The FSK signal receiving device according to claim 1.
する周波数変換回路と、中間周波数から所定の周波数だ
け偏移した第１および第２の周波数を中心とする第１お
よび第２のバンドパスフィルタとを備えたＦＳＫ信号受
信装置。(3) A frequency conversion circuit that converts the received high-frequency FSK signal to an intermediate frequency, and first and second bandpass filters centered on first and second frequencies that are shifted by a predetermined frequency from the intermediate frequency. An FSK signal receiving device comprising:
をＢとしたとき、第１の周波数が中間周波数−Ａ、第２
の周波数が中間周波数＋Ａ、第１および第２のバンドパ
スフィルタの帯域幅が各々２Ｂである請求項３に記載の
ＦＳＫ信号受信装置。(4) When the frequency deviation of the FSK signal is A and the bandwidth of the receiving device is B, the first frequency is the intermediate frequency -A, the second frequency is
4. The FSK signal receiving apparatus according to claim 3, wherein the frequency is the intermediate frequency +A, and the bandwidths of the first and second bandpass filters are each 2B.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2167687A JPH0456552A (en) | 1990-06-26 | 1990-06-26 | Fsk signal receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2167687A JPH0456552A (en) | 1990-06-26 | 1990-06-26 | Fsk signal receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0456552A true JPH0456552A (en) | 1992-02-24 |
Family
ID=15854370
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2167687A Pending JPH0456552A (en) | 1990-06-26 | 1990-06-26 | Fsk signal receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0456552A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2019022004A (en) * | 2017-07-13 | 2019-02-07 | 株式会社Ｊｖｃケンウッド | Receiver, reception method, and reception program |
-
1990
- 1990-06-26 JP JP2167687A patent/JPH0456552A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2019022004A (en) * | 2017-07-13 | 2019-02-07 | 株式会社Ｊｖｃケンウッド | Receiver, reception method, and reception program |
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