JPH01121102U - - Google Patents
Info
- Publication number
- JPH01121102U JPH01121102U JP1588288U JP1588288U JPH01121102U JP H01121102 U JPH01121102 U JP H01121102U JP 1588288 U JP1588288 U JP 1588288U JP 1588288 U JP1588288 U JP 1588288U JP H01121102 U JPH01121102 U JP H01121102U
- Authority
- JP
- Japan
- Prior art keywords
- recording
- circuit
- playback
- tape recorder
- state
- 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.)
- Granted
Links
- 230000002265 prevention Effects 0.000 claims description 2
- 230000003321 amplification Effects 0.000 claims 2
- 238000003199 nucleic acid amplification method Methods 0.000 claims 2
Description
図示した回路は、本考案のハウリング防止回路
の一実施例である。
主な図番の説明、１……テープレコーダー回路
、２……スイツチ回路、４……マイクロフオン、
５……録音再生兼用磁気ヘツド、８……主増幅回
路、１１……録音再生切換スイツチ、１４……ス
ピーカー、２０……操作回路、３１……ミユーテ
イング用トランジスター、３４……制御トランジ
スター、３８……時定数回路。
The illustrated circuit is one embodiment of the howling prevention circuit of the present invention. Explanation of main drawing numbers: 1 ...tape recorder circuit, 2...switch circuit, 4...microphone,
5...Magnetic head for both recording and playback, 8...Main amplifier circuit, 11...Recording/playback selector switch, 14...Speaker, 20...Operation circuit, 31...Muting transistor, 34...Control transistor, 38 ... ...Time constant circuit.
Claims (1)
ると共に前記マイクロフオン及び磁気ヘツドが接
続されているテープレコーダー回路を電子的に録
音状態と再生状態に切換えるように構成されたテ
ープレコーダーにおいて、前記テープレコーダー
回路に組込まれている増幅回路によつて増幅され
た信号が入力されると共に前記スピーカーが負荷
として接続されている主増幅回路と、該主増幅回
路の出力信号路内に挿入接続されていると共に録
音操作時再生側より録音側に切換えられ前記スピ
ーカーへの信号路を遮断する録音再生切換スイツ
チと、再生及び早送り等の各操作に応じた切換信
号を出力すると共に前記録音再生切換スイツチが
録音側にあるとき前記テープレコーダー回路を録
音状態にする録音切換信号を出力する操作回路と
、該操作回路から録音切換信号が出力されている
とき導通状態にあると共に前記主増幅回路へ入力
される信号を側路せしめるミユーテイング用トラ
ンジスターと、該ミユーテイング用トランジスタ
ーのベース回路に接続されている時定数回路とよ
り成り、前記録音再生切換スイツチの録音側から
再生側への切換動作による前記操作回路からの録
音切換信号の削減に伴なう前記テープレコーダー
回路の再生状態への切換動作時前記ミユーテイン
グ用トランジスターを所定時間導通状態に保持す
るようにしたことを特徴とするテープレコーダー
のハウリング防止回路。 A tape recorder having a built-in microphone and a speaker and configured to electronically switch a tape recorder circuit to which the microphone and magnetic head are connected between a recording state and a playback state. a main amplification circuit to which a signal amplified by an amplification circuit is input and to which the speaker is connected as a load; A recording and playback switch that switches from the playback side to the recording side and cuts off the signal path to the speaker, and outputs a switching signal corresponding to each operation such as playback and fast forward, and when the recording and playback switch is on the recording side. an operating circuit that outputs a recording switching signal that puts the tape recorder circuit into a recording state; and an operating circuit that is in a conductive state when the recording switching signal is output from the operating circuit and bypasses the signal input to the main amplifier circuit. It consists of a mutating transistor and a time constant circuit connected to the base circuit of the mutating transistor, and reduces the recording switching signal from the operating circuit by switching the recording/playback switch from the recording side to the playback side. 1. A howling prevention circuit for a tape recorder, characterized in that the muting transistor is maintained in a conductive state for a predetermined period of time when the tape recorder circuit is switched to a playback state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1588288U JP2517856Y2 (en) | 1988-02-09 | 1988-02-09 | Howling prevention circuit of tape recorder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1588288U JP2517856Y2 (en) | 1988-02-09 | 1988-02-09 | Howling prevention circuit of tape recorder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01121102U true JPH01121102U (en) | 1989-08-16 |
| JP2517856Y2 JP2517856Y2 (en) | 1996-11-20 |
Family
ID=31228328
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1588288U Expired - Lifetime JP2517856Y2 (en) | 1988-02-09 | 1988-02-09 | Howling prevention circuit of tape recorder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2517856Y2 (en) |
-
1988
- 1988-02-09 JP JP1588288U patent/JP2517856Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP2517856Y2 (en) | 1996-11-20 |
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