JPS625740U - - Google Patents
Info
- Publication number
- JPS625740U JPS625740U JP9714385U JP9714385U JPS625740U JP S625740 U JPS625740 U JP S625740U JP 9714385 U JP9714385 U JP 9714385U JP 9714385 U JP9714385 U JP 9714385U JP S625740 U JPS625740 U JP S625740U
- Authority
- JP
- Japan
- Prior art keywords
- telephone
- microphone
- attached
- microphones
- handset
- 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
- 230000002265 prevention Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 5
Description
第１図は本考案の一実施例を示す回路構成図、
第２図は第１図の要部概略図、第３図は本考案の
波形図、第４図は本考案の他の実施例を示す回路
図、第５図は従来の回路図、第６図は電話機の入
出力特性図である。
ＴＥＬ……電話機、ＭＩＣ１，ＭＩＣ２……マ
イクロホン、ＯＰ……オペアンプ。
FIG. 1 is a circuit diagram showing an embodiment of the present invention;
FIG. 2 is a schematic diagram of the main parts of FIG. 1, FIG. 3 is a waveform diagram of the present invention, FIG. 4 is a circuit diagram showing another embodiment of the present invention, FIG. 5 is a conventional circuit diagram, and FIG. The figure shows the input/output characteristics of the telephone. TEL...telephone, MIC 1 , MIC 2 ...microphone, OP... operational amplifier.
Claims (1)
ドセツトに取り付けられた送話用の第１のマイク
ロホンと、前記電話機の本体に取り付けられた第
２のマイクロホンと、前記第１および第２のマイ
クロホンの出力をそれぞれ逆相で加算あるいは減
算したのち増幅する増幅器とよりなる電話機の周
囲雑音防止回路。 In the telephone communication circuit of the telephone, a first microphone for transmitting speech attached to the handset of the telephone, a second microphone attached to the main body of the telephone, and outputs of the first and second microphones, respectively. A telephone ambient noise prevention circuit consisting of an amplifier that adds or subtracts in reverse phase and then amplifies it.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9714385U JPS625740U (en) | 1985-06-26 | 1985-06-26 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9714385U JPS625740U (en) | 1985-06-26 | 1985-06-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS625740U true JPS625740U (en) | 1987-01-14 |
Family
ID=30963772
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9714385U Pending JPS625740U (en) | 1985-06-26 | 1985-06-26 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS625740U (en) |
-
1985
- 1985-06-26 JP JP9714385U patent/JPS625740U/ja active Pending