JPS58196606A

JPS58196606A - Tape noise eliminating method of magnetic tape recorder

Info

Publication number: JPS58196606A
Application number: JP7756682A
Authority: JP
Inventors: Shigeaki Morita; 森田　重明
Original assignee: Individual
Current assignee: Individual
Priority date: 1982-05-11
Filing date: 1982-05-11
Publication date: 1983-11-16

Abstract

PURPOSE:To eliminate the noises of a magnetic tape, by reading out the tape noises through a head when the sound recording is carried out and then recording the read-out noise component in conforming with the original signal in an adverse phase. CONSTITUTION:A main signal and a bias signal (m) is looped with a coupling transformer T, etc. through a microphone M, preamplifiers AMP1 and AMP2, a main amplifier AMP3, etc. A tape noise eliminating signal (k) which is read out to a differential amplifier AMP5 via a sample control signal (h) passed through an impedance balancer L, a balance signal (i) supplied to the AMP5 from a bias oscillator O, a tape noise reading-out signal (j), etc. and then amplified by an amplifier AMP6 is injected to a main recording signal in an adverse phase. In such a way, the noise of a magnetic tape can be eliminated.

Description

【発明の詳細な説明】この発明は磁気テープレコーダーの録音用ヘッドが再生
用ヘッドにもなる事を利用し録音時ヘッドよりのテープ
雑音を読み出し読み出した雑音分を逆相にして元の信号
に合わせて録音すれば雑音が除去出来る事に着目したシ
ステムで構成図を図１、図２図３で示す１）テープ録音構成図の説明図１、図２についてはａ）Ｍ、ＡＭＰ１、Ｒ、ＡＭＰ２、ＡＭＰ３を通りＴ、
Ｈ、とループするメイン信号及バイアス用信号（注５）
ｂ）ＡＭＰ２、ＡＭＰ４、Ｌを通ったサンプル制御信号
（注１）ｃ）ＯよりＡＭＰ５へのバランス用信号（注２
）ｄ）Ｈよりのテープ雑音読み出し用信号（注３）ｅ）
ＡＭＰ５にて読み出されＡＭＰ６にて増幅されたテープ
雑音除去用信号（注４）以上ａ）〜ｅ）の信号系をしてテープ雑音を消去するシ
ステムである２）テープ再生構成図の説明図３についてはＭ、ＡＭＰ１　Ｒ、ＡＭＰ２、ＡＭＰ３、Ｓ、にて再生
するシステムである３）発明の補足説明ａ）（注４）信号はメイン録音信号に対して逆相になる
様に■入するｂ）Ｌはヘッドのインピーダンスに合わせテープによる
雑音信号のみを選び出す為に置く（チョークコイル、ト
ランス等を使用する）ｃ）図２はＲＥＣ部の具体的回路例であるｄ）各増幅器
の増幅特性はリニアリティである場合の回路構成であっ
て乗数特性の入る場合は特性を合わせる必要がある[Detailed Description of the Invention] This invention takes advantage of the fact that the recording head of a magnetic tape recorder also functions as a playback head, reads tape noise from the head during recording, reverses the phase of the read noise, and converts it into the original signal. The system focuses on the fact that noise can be removed by recording together, and the configuration diagrams are shown in Figures 1, 2, and 3. 1) Explanation of the tape recording configuration diagram Regarding Figures 1 and 2, a) M, AMP1, R, T through AMP2 and AMP3,
Main signal and bias signal looped with H (Note 5)
b) Sample control signal passed through AMP2, AMP4, and L (Note 1) c) Balance signal from O to AMP5 (Note 2)
) d) Signal for reading tape noise from H (Note 3) e)
Tape noise removal signal read out by AMP5 and amplified by AMP6 (Note 4) Explanatory diagram of 2) Tape playback configuration diagram, which is a system for eliminating tape noise using the signal systems a) to e) above. Regarding 3, it is a system that plays back on M, AMP1 R, AMP2, AMP3, and S. 3) Supplementary explanation of the invention a) (Note 4) The signal is input so that it has the opposite phase to the main recording signal. b) L is placed to match the impedance of the head and select only the noise signal from the tape (use a choke coil, transformer, etc.) c) Figure 2 is a specific circuit example of the REC section d) Amplification characteristics of each amplifier is the circuit configuration for linearity, and if multiplier characteristics are included, the characteristics must be matched.

[Brief explanation of the drawing]

Ｍ−マイクロホン、プレーヤ、チーナー等（入力信号元
）ＡＭＰ１−前置増幅器（イコライザー回路）Ｒ−可変
抵抗器ＡＭＰ２−前置増幅器ＡＭＰ３−メイン増幅器ＡＭＰ４−前置増幅器Ｌ−インピーダンスバランサー（チョークコイル、トラ
ンス等）Ｏ−バイアス発振器ＡＭＰ５−差動増幅器ＡＭＰ６−増幅器ＲＥＣ−ヘッド及カップリングトランス等の回路Ｈ−ヘ
ッドＴＥ−テープＴ−カップリングトランスＳ−スピーカーＦ−バイアスフィルターM - Microphone, player, tuner, etc. (input signal source) AMP1 - Preamplifier (equalizer circuit) R - Variable resistor AMP2 - Preamplifier AMP3 - Main amplifier AMP4 - Preamplifier L - Impedance balancer (choke coil, transformer etc.) O - Bias oscillator AMP5 - Differential amplifier AMP6 - Amplifier REC - Circuits such as head and coupling transformer H - Head TE - Tape T - Coupling transformer S - Speaker F - Bias filter

Claims

[Claims]

About removing tape noise with the circuit configuration shown in Figures 1 and 2 using a magnetic head for both recording and playback.