JPH0163272U - - Google Patents
Info
- Publication number
- JPH0163272U JPH0163272U JP1987157007U JP15700787U JPH0163272U JP H0163272 U JPH0163272 U JP H0163272U JP 1987157007 U JP1987157007 U JP 1987157007U JP 15700787 U JP15700787 U JP 15700787U JP H0163272 U JPH0163272 U JP H0163272U
- Authority
- JP
- Japan
- Prior art keywords
- audio intermediate
- intermediate frequency
- frequency
- pass filter
- filter
- 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
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Television Receiver Circuits (AREA)
Description
第１図は本考案の一実施例における音声中間周
波回路の回路図、第２図イ，ロ，ハ，ニは夫々、
フイルタの選択度特性を示す図である。第３図は
従来の音声中間周波回路の回路図である。
１……ＶＩＦ、ＳＩＦ用ＩＣ、２……ハイパス
フイルタ、３……バンドパスフイルタ、４……ロ
ーパスフイルタ。
Fig. 1 is a circuit diagram of an audio intermediate frequency circuit in an embodiment of the present invention, and Fig. 2 A, B, C, and D are respectively shown.
FIG. 3 is a diagram showing selectivity characteristics of a filter. FIG. 3 is a circuit diagram of a conventional audio intermediate frequency circuit. 1...IC for VIF, SIF, 2...High pass filter, 3...Band pass filter, 4...Low pass filter.
Claims (1)
パスフイルタと、このバンドパスフイルタと直列
に接続され、音声中間周波数ｆｏとこの音声中間
周波数ｆｏの２分の１の周波数ｆｏ／２の中間に
遮断周波数を設定したハイパスフイルタと、前記
バンドパスフイルタと直列に接続され、音声中間
周波数ｆｏより若干高い周波数に遮断周波数を設
定したローパスフイルタとで音声中間周波入力フ
イルタを構成してなる音声中間周波回路。 A bandpass filter that passes the audio intermediate frequency fo as the center, and a cutoff frequency that is connected in series with the bandpass filter and is located between the audio intermediate frequency fo and a frequency fo/2 that is one half of the audio intermediate frequency fo. An audio intermediate frequency circuit constitutes an audio intermediate frequency input filter by a set high-pass filter and a low-pass filter connected in series with the band-pass filter and having a cutoff frequency set to a frequency slightly higher than the audio intermediate frequency fo.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987157007U JPH0163272U (en) | 1987-10-14 | 1987-10-14 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987157007U JPH0163272U (en) | 1987-10-14 | 1987-10-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0163272U true JPH0163272U (en) | 1989-04-24 |
Family
ID=31436064
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987157007U Pending JPH0163272U (en) | 1987-10-14 | 1987-10-14 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0163272U (en) |
-
1987
- 1987-10-14 JP JP1987157007U patent/JPH0163272U/ja active Pending
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