JPH0310630U - - Google Patents
Info
- Publication number
- JPH0310630U JPH0310630U JP7016389U JP7016389U JPH0310630U JP H0310630 U JPH0310630 U JP H0310630U JP 7016389 U JP7016389 U JP 7016389U JP 7016389 U JP7016389 U JP 7016389U JP H0310630 U JPH0310630 U JP H0310630U
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- heterodyne detection
- oscillation
- intermediate frequency
- local oscillator
- 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 8
- 230000010355 oscillation Effects 0.000 claims description 6
- 238000010408 sweeping Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 4
- 230000001360 synchronised effect Effects 0.000 description 1
Landscapes
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
- Superheterodyne Receivers (AREA)
Description
第１図は本考案の一実施例による周波数バンド
の識別装置のブロツク構成図、第２図は同装置の
動作を説明するための信号波形のタイムチヤート
、第３図は従来の識別装置のブロツク構成図、第
４図は局部発振をスイープしてヘテロダイン検波
する動作を説明する図である。
１１……第１ヘテロダイン検波部、１２……ア
ンテナ（導波部）、１３……第１局部発振器、１
５……第１中間周波アンプ、１６……第２ヘテロ
ダイン検波部、１７…第３局部発振器、２０……
ロジツク部、２１……ＰＬＬ同期検波部、２３…
…スイープ発振器。
FIG. 1 is a block diagram of a frequency band identification device according to an embodiment of the present invention, FIG. 2 is a time chart of signal waveforms to explain the operation of the device, and FIG. 3 is a block diagram of a conventional identification device. The configuration diagram, FIG. 4, is a diagram illustrating the operation of sweeping local oscillation and performing heterodyne detection. 11...First heterodyne detection section, 12...Antenna (waveguide section), 13...First local oscillator, 1
5...First intermediate frequency amplifier, 16...Second heterodyne detection section, 17...Third local oscillator, 20...
Logic section, 21...PLL synchronous detection section, 23...
...Sweep oscillator.
Claims (1)
振器の発振波とから第１中間周波を得る第１ヘテ
ロダイン検波部と、この第１中間周波と発振周波
をスイープさせた第２局部発振器の発振波とから
第２中間周波を得る第２ヘテロダイン検波部とを
備え、第２中間周波の位相に基づき周波数バンド
の識別を行うスーパーヘテロダイン受信機におけ
る周波数バンドの識別装置において、 第２ヘテロダイン検波部の出力端に、該ヘテロ
ダイン検波部にて第２局部発振波の発振周波をス
イープして第２中間周波信号を最初のヘテロダイ
ンポイントで検波したとき、パルスを出力するロ
ジツク部を設け、かつ、上記第２局部発振器は、
上記のロジツク部からのパルスを受けて発振周波
のスイープの傾斜が緩やかになる回路構成を有し
たことを特徴とするスーパーヘテロダイン受信機
における周波数バンドの識別装置。[Claims for Utility Model Registration] A first heterodyne detection unit that obtains a first intermediate frequency from a received wave of a waveguide and an oscillation wave of a first local oscillator forming a PLL circuit; Frequency band identification in a superheterodyne receiver that includes a second heterodyne detection section that obtains a second intermediate frequency from the swept oscillation wave of the second local oscillator, and that identifies frequency bands based on the phase of the second intermediate frequency. In the apparatus, a pulse is output to the output end of the second heterodyne detection section when the second intermediate frequency signal is detected at the first heterodyne point by sweeping the oscillation frequency of the second local oscillation wave in the heterodyne detection section. A logic section is provided, and the second local oscillator is
A frequency band identification device in a superheterodyne receiver, characterized by having a circuit configuration in which the slope of the sweep of the oscillation frequency is gentle in response to a pulse from the logic section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7016389U JPH0310630U (en) | 1989-06-15 | 1989-06-15 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7016389U JPH0310630U (en) | 1989-06-15 | 1989-06-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0310630U true JPH0310630U (en) | 1991-01-31 |
Family
ID=31606092
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7016389U Pending JPH0310630U (en) | 1989-06-15 | 1989-06-15 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0310630U (en) |
-
1989
- 1989-06-15 JP JP7016389U patent/JPH0310630U/ja active Pending
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