JP2776080B2 - Radio selective call receiver - Google Patents
Radio selective call receiverInfo
- Publication number
- JP2776080B2 JP2776080B2 JP3235652A JP23565291A JP2776080B2 JP 2776080 B2 JP2776080 B2 JP 2776080B2 JP 3235652 A JP3235652 A JP 3235652A JP 23565291 A JP23565291 A JP 23565291A JP 2776080 B2 JP2776080 B2 JP 2776080B2
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- unit
- local
- signal
- receiver
- 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.)
- Expired - Lifetime
Links
- 238000001914 filtration Methods 0.000 claims description 17
- 230000010355 oscillation Effects 0.000 claims description 17
- 230000003321 amplification Effects 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000003199 nucleic acid amplification method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000002542 deteriorative effect Effects 0.000 description 2
- 101100321817 Human parvovirus B19 (strain HV) 7.5K gene Proteins 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Landscapes
- Superheterodyne Receivers (AREA)
- Mobile Radio Communication Systems (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は無線選択呼出受信機に関
し、特に受信周波数の変更を可能にした受信機に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio selective calling receiver, and more particularly to a receiver capable of changing a receiving frequency.
【０００２】[0002]
【従来の技術】従来の無線選択呼出受信機は、製造時に
受信周波数が決定され、後から変更するのは困難であ
る。そこで、局部発振部やその水晶発振子を交換可能に
構成して受信周波数を変更できるようにしたものが提案
されている。図３はその一例の一部のブロック図であ
る。同図において、空中線１で受信した信号を高周波増
幅部２で増幅し、かつ高周波帯域ろ波部３でろ波した
後、第１周波数混合部４Ａにおいて第１局部発振部５Ａ
の信号と混合して周波数変換する。更に、第１中間周波
帯域ろ波部６Ａでろ波した後、第２周波数混合部４Ｂに
おいて第２局部発振部５Ｂの信号と混合して再度周波数
変換する。その上で、第２中間周波帯域ろ波部６Ｂでろ
波し、図外の中間周波増幅部へ出力される。ここで、第
１局部発振部５Ａを異なる周波数信号を発生するものと
交換可能にすることで、第１周波数混合部４Ａで周波数
変換される受信信号の周波数を変更することが可能とな
る。2. Description of the Related Art In a conventional radio selective calling receiver, the receiving frequency is determined at the time of manufacture, and it is difficult to change it later. Therefore, there has been proposed a device in which the local oscillator and its crystal oscillator are configured to be exchangeable so that the reception frequency can be changed. FIG. 3 is a partial block diagram of the example. In the figure, after a signal received by an antenna 1 is amplified by a high frequency amplifying unit 2 and filtered by a high frequency band filtering unit 3, a first local oscillation unit 5A in a first frequency mixing unit 4A.
And frequency conversion by mixing with the signal. Further, after being filtered by the first intermediate frequency band filtering section 6A, the second frequency mixing section 4B mixes the signal with the signal of the second local oscillation section 5B and performs frequency conversion again. Then, the signal is filtered by the second intermediate frequency band filtering section 6B and output to an intermediate frequency amplifying section (not shown). Here, by making the first local oscillating unit 5A replaceable with one that generates a different frequency signal, it becomes possible to change the frequency of the received signal that is frequency-converted by the first frequency mixing unit 4A.
【０００３】[0003]
【発明が解決しようとする課題】このような受信機で
は、第１局部発振部５Ａの局部発振周波数のみを変化さ
せる構成であるため、可変できる周波数範囲は狭く、所
要の可変周波数範囲を得るためには周波数変換を２回行
うダブルスーパヘテロダイン方式を採用せざるを得ず、
回路構成が複雑になるという問題がある。又、高周波帯
域ろ波部３の帯域を可変周波数範囲に合わせて広く設計
しているため、相互変調特性が悪化するという問題もあ
る。本発明の目的は、回路構成を簡略化するとともに相
互変調特性を悪化させることなく所要範囲の周波数変更
を可能にした無線選択呼出受信機を提供することにあ
る。In such a receiver, since only the local oscillation frequency of the first local oscillation section 5A is changed, the variable frequency range is narrow. Has to adopt a double superheterodyne system that performs frequency conversion twice,
There is a problem that the circuit configuration becomes complicated. Further, since the band of the high-frequency band filter unit 3 is designed to be wide in accordance with the variable frequency range, there is a problem that the intermodulation characteristics are deteriorated. SUMMARY OF THE INVENTION It is an object of the present invention to provide a radio selective call receiver which can simplify a circuit configuration and can change a required frequency range without deteriorating intermodulation characteristics.
【０００４】[0004]
【課題を解決するための手段】本発明の無線選択呼出受
信機は、高周波帯域ろ波部、周波数混合部及び局部発振
部を１つのユニットとして構成し、このユニットを受信
機に対して着脱可能に構成する。即ち、一の周波数の局
部発振信号を発生する局部発振部と、これに対応して設
計した狭い帯域の高周波帯域ろ波部と、周波数混合部と
をユニット化したものを、異なる周波数の局部信号を発
生する局部発振部を有する他のユニットと交換可能に構
成する。A radio selective calling receiver according to the present invention comprises a high-frequency band filtering section, a frequency mixing section and a local oscillation section as one unit, and this unit is detachable from the receiver. To be configured. That is, a local oscillation unit that generates a local oscillation signal of one frequency, a high-frequency band filtering unit with a narrow band designed corresponding to the local oscillation unit, and a frequency mixing unit are united into local signals of different frequencies. Is configured to be replaceable with another unit having a local oscillation unit that generates the above.
【０００５】[0005]
【作用】本発明によれば、局部発振部と共に高周波帯域
ろ波部と周波数混合部を１つのユニットとして一体的に
交換させることで、広い周波数範囲の局部信号に対応し
た周波数変換を可能とし、かつ高周波帯域ろ波部の狭帯
域設計を可能とする。According to the present invention, the high frequency band filtering section and the frequency mixing section together with the local oscillation section are integrally exchanged as one unit, thereby enabling frequency conversion corresponding to a local signal in a wide frequency range. In addition, a narrow band design of the high frequency band filtering section is enabled.
【０００６】[0006]
【実施例】次に、本発明について図面を参照して説明す
る。図１は本発明の一実施例の主要部のブロック図であ
り、空中線１で受信した信号を高周波増幅部２で高周波
増幅し、高周波帯域ろ波器３でろ波した後、周波数混合
部４において局部発振部５の信号と混合して周波数変換
する。更に、周波数変換した信号を中間周波帯域ろ波部
６でろ波し、中間周波増幅部７で中間周波増幅を行うよ
うにする。そして、同図に破線で囲むように、前記高周
波帯域ろ波器３、周波数混合部４及び局部発振部５は１
つのユニット８として構成する。このユニット８は、図
２に示すように、無線選択呼出受信機のケース９及びカ
バー１０で構成されるケーシング内に着脱可能な構成と
し、ユニット８及び回路基板１１にそれぞれ設けたコネ
クタ１２を利用して相互に電気接続可能に構成する。Next, the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of a main part of an embodiment of the present invention. After a signal received by an antenna 1 is amplified by a high frequency amplifier 2 and filtered by a high frequency bandpass filter 3, a signal is received by a frequency mixer 4. The signal is mixed with the signal of the local oscillator 5 and frequency-converted. Further, the frequency-converted signal is filtered by the intermediate frequency band filtering unit 6 and the intermediate frequency amplification unit 7 performs intermediate frequency amplification. As indicated by a broken line in FIG. 1, the high-frequency bandpass filter 3, the frequency mixing unit 4, and the local oscillation unit 5
It is configured as one unit 8. As shown in FIG. 2, the unit 8 is configured to be detachable in a casing composed of a case 9 and a cover 10 of the radio selective calling receiver, and uses a connector 12 provided on the unit 8 and a circuit board 11, respectively. So that they can be electrically connected to each other.
【０００７】この構成によれば、受信機では、空中線１
において回線周波数付近の広帯域の電波を受け、高周波
増幅部２において増幅し、高周波帯域ろ波部３において
回線周波数±２５ＫＨZ の電波を通過させる。そして、
周波数混合部４において局部発振部５で発生した回線周
波数−４５５ＫＨZ の周波数信号と混合され、中間周波
数４５５ＫＨZ に変換される。中間周波数に変換された
回線波は中間周波帯域ろ波部６において４５５± 7.5Ｋ
ＨZ が通過され、中間周波増幅部７において増幅され、
復調部へ送られる。[0007] According to this configuration, in the receiver, the antenna 1
In receiving the radio waves of broadband near line frequency, amplified in the high frequency amplifying unit 2, passes the wave line frequency ± 25KH Z in the high-frequency band-pass filter unit 3. And
Is mixed with a frequency signal of the line frequency -455KH Z generated by the local oscillator 5 in the frequency mixing unit 4, it is converted to an intermediate frequency 455KH Z. The line wave converted to the intermediate frequency is 455 ± 7.5K in the intermediate frequency band filtering section 6.
HZ is passed and amplified in the intermediate frequency amplification unit 7,
It is sent to the demodulation unit.
【０００８】そして、ここでは、高周波帯域ろ波部３、
周波数混合部４を局部発振部５と共にユニットとして構
成しているため、異なる周波数信号を発生する局部発振
部と、これに対応して設計した高周波帯域ろ波部３と周
波数混合部４とを一体化させた別のユニットと交換する
ことで受信周波数を変更することが可能となる。これに
より、周波数混合部４における周波数変換の周波数範囲
を広げて受信周波数の変更範囲を拡大させ、受信機をシ
ングルスーパヘテロダイン方式で構成することを可能に
して回路構成の簡略化を図ることができる。又、高周波
帯域ろ波部３と周波数混合部４を局部発振器５の発振周
波数に対応させた特性に設計することが容易であるた
め、高周波帯域ろ波部３を狭帯域に設計でき、受信機に
おける相互変調特性の悪化が防止できる。In this case, the high-frequency band filtering section 3
Since the frequency mixing section 4 is configured as a unit together with the local oscillation section 5, the local oscillation section for generating different frequency signals, the high-frequency band filtering section 3 and the frequency mixing section 4 designed correspondingly are integrated. It is possible to change the reception frequency by replacing the unit with another unit. As a result, the frequency range of the frequency conversion in the frequency mixing unit 4 is widened and the range of change of the reception frequency is widened, and the receiver can be configured in a single superheterodyne system, thereby simplifying the circuit configuration. . Further, since it is easy to design the high-frequency band filtering section 3 and the frequency mixing section 4 to have characteristics corresponding to the oscillation frequency of the local oscillator 5, the high-frequency band filtering section 3 can be designed to have a narrow band, and Can be prevented from deteriorating.
【０００９】[0009]
【発明の効果】以上説明したように本発明は、局部発振
部、高周波帯域ろ波部、周波数混合部を１つのユニット
として構成し、これを異なる周波数のユニットと交換可
能に構成しているため、ユニットを局部発振部の周波数
に対応させて設計でき、広い範囲において受信周波数の
変更を可能にする一方で、ダブルスーパヘテロダイン方
式に構成する必要を無くして回路の簡略化が実現でき
る。又、一の周波数の局部信号を発生する局部発振部
と、これに対応して設計した狭い帯域の高周波帯域ろ波
部と、周波数混合部とでユニット化することにより、各
ユニットにおいては自身の局部発振部に対応させて高周
波帯域ろ波部を狭帯域に設計することを可能にし、受信
機における相互変調特性を改善することができる効果が
ある。As described above, according to the present invention, the local oscillating unit, the high frequency band filtering unit and the frequency mixing unit are configured as a single unit, which is interchangeable with units having different frequencies. The unit can be designed to correspond to the frequency of the local oscillation unit, and the reception frequency can be changed in a wide range, while simplification of the circuit can be realized by eliminating the necessity of configuring a double superheterodyne system. Also, a local oscillator that generates a local signal of one frequency
And a narrow band high frequency band filter designed correspondingly
Unit and the frequency mixing unit,
In the unit, it is possible to design the high-frequency band filter in a narrow band corresponding to its own local oscillator, and it is possible to improve the intermodulation characteristics in the receiver.
【図１】本発明の無線選択呼出受信機の一実施例の主要
部のブロック図である。FIG. 1 is a block diagram of a main part of an embodiment of a radio selective call receiver according to the present invention.
【図２】本発明の無線選択呼出受信機の構成を模式的に
示す部分分解斜視図である。FIG. 2 is a partially exploded perspective view schematically showing the configuration of the radio selective calling receiver of the present invention.
【図３】従来の無線選択呼出受信機の一例の一部のブロ
ック図である。FIG. 3 is a partial block diagram of an example of a conventional radio selective calling receiver.
１ 空中線 ２ 高周波増幅部 ３ 高周波帯域ろ波部 ４ 高周波混合部 ５ 局部発振部 ６ 中間周波帯域ろ波部 ７ 中間周波増幅部 DESCRIPTION OF SYMBOLS 1 Antenna 2 High frequency amplification part 3 High frequency band filtering part 4 High frequency mixing part 5 Local oscillation part 6 Intermediate frequency band filtering part 7 Intermediate frequency amplification part
Claims (1)
通した後、周波数混合部において局部発振部の局部周波
数信号と混合して周波数変換する方式の無線選択呼出受
信機において、前記高周波帯域ろ波部、周波数混合部及
び局部発振部を１つのユニットとして構成し、このユニ
ットを受信機に対して着脱可能に構成するとともに、前
記ユニットは、一の周波数の局部信号を発生する局部発
振部と、これに対応して設計した狭い帯域の高周波帯域
ろ波部と、周波数混合部とをユニット化したものを、こ
れと異なる周波数の局部信号を発生する局部発振部を含
む他のユニットと交換可能に構成したことを特徴とする
無線選択呼出受信機。1. A radio selective paging receiver of a type in which a received paging signal is passed through a high-frequency band filter, mixed with a local frequency signal of a local oscillator in a frequency mixer, and frequency-converted. The filtering unit, the frequency mixing unit, and the local oscillation unit are configured as one unit, and this unit is configured to be detachable from the receiver.
The local unit generates a local signal of one frequency.
Resonator and narrow band high frequency band designed correspondingly
The filter unit and the frequency mixing unit
Local oscillator that generates a local signal with a different frequency
Wireless selective call receiver, which is configured to be exchangeable with another unit .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3235652A JP2776080B2 (en) | 1991-08-23 | 1991-08-23 | Radio selective call receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3235652A JP2776080B2 (en) | 1991-08-23 | 1991-08-23 | Radio selective call receiver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0555983A JPH0555983A (en) | 1993-03-05 |
| JP2776080B2 true JP2776080B2 (en) | 1998-07-16 |
Family
ID=16989191
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3235652A Expired - Lifetime JP2776080B2 (en) | 1991-08-23 | 1991-08-23 | Radio selective call receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2776080B2 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61123323A (en) * | 1984-11-20 | 1986-06-11 | Matsushita Electric Ind Co Ltd | High frequency unit for satellite broadcast indoor receiver |
| JPH062355Y2 (en) * | 1988-08-11 | 1994-01-19 | 日本電気株式会社 | Frequency change adapter |
-
1991
- 1991-08-23 JP JP3235652A patent/JP2776080B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0555983A (en) | 1993-03-05 |
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