JPS60169706U - bias control device - Google Patents
bias control deviceInfo
- Publication number
- JPS60169706U JPS60169706U JP5714384U JP5714384U JPS60169706U JP S60169706 U JPS60169706 U JP S60169706U JP 5714384 U JP5714384 U JP 5714384U JP 5714384 U JP5714384 U JP 5714384U JP S60169706 U JPS60169706 U JP S60169706U
- Authority
- JP
- Japan
- Prior art keywords
- bias
- output
- signal
- adder
- control device
- 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
Landscapes
- Networks Using Active Elements (AREA)
- Digital Magnetic Recording (AREA)
- Control Of Amplification And Gain Control (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
第1図は低域信号に対する交流バイアス量と磁気テープ
に記録できる最大信号レベルの関係を示すグラフである
。第2図は高域信号に対する交流バイアス量と磁気テー
プに記録できる最大信号レベルの関係を示すグラフであ
る。第3図は低域信号に対する交流バイアス量と3次高
調波歪率特性を示すグラフである。第4図は従来のバイ
アス制御装置の構成を示すブロック図である。第5図は
本考案の一実施例によるバイアス制御装置の構成を示す
ブロック図である。
1・・・・・・記録ヘッド、2・・・・・・抵抗、3・
・・・・・コンデンサ、4・・・・・・ローパスフィル
ター、5・・・・・・ピーク検波器、6・・・・・・比
較器、7・・・・・・比較器の反転入力、8・・・・・
・比較器の非反転入力、9・・・・・・基準電圧源、1
0・・・・・・電圧制御増幅器、11・・・・・・電圧
制御増幅器の利得制御入力、12・・・・・・消去発振
器、13・・・・・・信号入力端子、14・・・・・・
加算器、15・・・・・・消去ヘッド、16・・・・・
・磁気テープ、17・・・・・・結合コンデンサ、18
・・・・・・抵抗、19・・・・・・直流バイアス源。FIG. 1 is a graph showing the relationship between the amount of AC bias for low frequency signals and the maximum signal level that can be recorded on a magnetic tape. FIG. 2 is a graph showing the relationship between the amount of AC bias for high frequency signals and the maximum signal level that can be recorded on a magnetic tape. FIG. 3 is a graph showing the AC bias amount and third harmonic distortion rate characteristics for a low frequency signal. FIG. 4 is a block diagram showing the configuration of a conventional bias control device. FIG. 5 is a block diagram showing the configuration of a bias control device according to an embodiment of the present invention. 1...recording head, 2...resistance, 3.
... Capacitor, 4 ... Low pass filter, 5 ... Peak detector, 6 ... Comparator, 7 ... Inverting input of comparator , 8...
・Comparator non-inverting input, 9...Reference voltage source, 1
0... Voltage controlled amplifier, 11... Gain control input of voltage controlled amplifier, 12... Erasing oscillator, 13... Signal input terminal, 14...・・・・・・
Adder, 15... Erasing head, 16...
・Magnetic tape, 17... Coupling capacitor, 18
...Resistor, 19...DC bias source.
Claims (1)
アス信号を発生する発振器と、前記交流バイアス信号を
入力し、制御信号に応じた利得で増幅する増幅器と、該
増幅器の出力と前記入力信号とを加算する加算器と、該
加算器の出力を入力するローパスフィルターと、該ロー
パスフィルターの出力を結合コンデンサを介して受ける
振幅検波器と、該振幅検波器の入力に抵抗を介して直流
バイアスを与える直流バイアス手段と、前記振幅検波器
の出力を前記制御信号として前記増幅器に与える手段と
を含むことを特徴とするバイアス制御装置。an input terminal that receives an input signal to be magnetically recorded; an oscillator that generates an AC bias signal; an amplifier that receives the AC bias signal and amplifies it with a gain according to a control signal; and an output of the amplifier and the input signal. an adder that adds the output of the adder, a low-pass filter that inputs the output of the adder, an amplitude detector that receives the output of the low-pass filter via a coupling capacitor, and a DC bias applied to the input of the amplitude detector via a resistor. A bias control device comprising: direct current bias means for applying a direct current bias; and means for applying an output of the amplitude detector to the amplifier as the control signal.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5714384U JPS60169706U (en) | 1984-04-18 | 1984-04-18 | bias control device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5714384U JPS60169706U (en) | 1984-04-18 | 1984-04-18 | bias control device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS60169706U true JPS60169706U (en) | 1985-11-11 |
JPH042407Y2 JPH042407Y2 (en) | 1992-01-28 |
Family
ID=30581396
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP5714384U Granted JPS60169706U (en) | 1984-04-18 | 1984-04-18 | bias control device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS60169706U (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS55118329U (en) * | 1979-02-15 | 1980-08-21 |
-
1984
- 1984-04-18 JP JP5714384U patent/JPS60169706U/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS55118329U (en) * | 1979-02-15 | 1980-08-21 |
Also Published As
Publication number | Publication date |
---|---|
JPH042407Y2 (en) | 1992-01-28 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPS60169706U (en) | bias control device | |
JPH0426963Y2 (en) | ||
JPS5856317U (en) | Tape recorder bias current supply circuit | |
JPS606912Y2 (en) | magnetic recording circuit | |
SU1539830A1 (en) | Device for magnetic recording with adaptive magnetizing | |
JP2715481B2 (en) | Pulse width modulation signal regeneration circuit | |
JPS6113364U (en) | magnetic recording and reproducing device | |
JPS6144925U (en) | automatic gain control amplifier circuit | |
JPS59147315U (en) | PWM amplifier | |
JPS59194113U (en) | Automatic gain control circuit for tape recorder | |
JPS5933112U (en) | magnetic recording and reproducing device | |
JPS5814216U (en) | Oscillation frequency control circuit | |
JPH01211274A (en) | Drop out detector | |
JPS601685B2 (en) | magnetic recording method | |
JPS60108021U (en) | amplifier | |
JPS6012807U (en) | magnetic recording and playback device | |
JPS5894120U (en) | Tape recorder recording circuit | |
JPS5894195U (en) | magnetic recording and reproducing device | |
JPS5868711U (en) | Control circuit for variable frequency oscillator | |
JPS60111551U (en) | FM recording and playback circuit | |
JPS5939413U (en) | tape recorder | |
JPS5978537U (en) | tape recorder | |
JPS60150814U (en) | AGC circuit | |
JPS5920415U (en) | tape recorder | |
JPS5872711U (en) | Tape recorder amplifier circuit |