JPH03222508A - Amplifier circuit - Google Patents

Amplifier circuit

Info

Publication number
JPH03222508A
JPH03222508A JP2017552A JP1755290A JPH03222508A JP H03222508 A JPH03222508 A JP H03222508A JP 2017552 A JP2017552 A JP 2017552A JP 1755290 A JP1755290 A JP 1755290A JP H03222508 A JPH03222508 A JP H03222508A
Authority
JP
Japan
Prior art keywords
speaker
impedance
output voltage
control information
voice coil
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
Application number
JP2017552A
Other languages
Japanese (ja)
Inventor
Yozo Takahashi
高橋 洋三
Katsuhisa Shibata
柴田 勝久
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Onkyo Corp
Original Assignee
Onkyo Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Onkyo Corp filed Critical Onkyo Corp
Priority to JP2017552A priority Critical patent/JPH03222508A/en
Publication of JPH03222508A publication Critical patent/JPH03222508A/en
Pending legal-status Critical Current

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  • Circuit For Audible Band Transducer (AREA)
  • Amplifiers (AREA)

Abstract

PURPOSE:To drive a speaker linearly regardless of impedance fluctuation by providing an output voltage control means varying an output voltage to the speaker corresponding to an impedance change due to generation of heat at the voice coil of the speaker. CONSTITUTION:A control information signal Ec outputted from an impedance detection means 1 detecting the impedance of a voice coil of a speaker 6 in real time during the operation of a speaker is inputted to an output voltage control means 2. The output voltage control means 2 varies an input voltage Ei of the reproduction system to obtain the input voltage Eo of an amplifier 5 and corrects the fluctuation of input power to the speaker 6 by controlling the input voltage to the amplifier 5 for driving the speaker 6. Thus, even when the voice coil temperature rises during the speaker operation and the impedance changes, the speaker is driven linearly regardless of the impedance fluctuation.

Description

【発明の詳細な説明】 [産業上の利用分野] この発明は、スピーカに印加された電力によってボイス
コイルが発熱し、インピーダンスが変化しても、スピー
カへの実質的な入力電力が変動することのない増幅器回
路に関する。
[Detailed Description of the Invention] [Industrial Field of Application] This invention provides a method for generating heat in the voice coil due to the power applied to the speaker, and even if the impedance changes, the actual power input to the speaker will fluctuate. Concerning an amplifier circuit without.

[従来の技術] 従来、オーディオ機器等でスピーカを駆動する増幅器は
、通常定電圧増幅器と呼称され、負荷が変動しても音楽
信号出力電圧が一定となる増幅器が使用されている。
[Prior Art] Conventionally, an amplifier for driving a speaker in an audio device or the like is usually called a constant voltage amplifier, and an amplifier is used in which the music signal output voltage remains constant even if the load fluctuates.

[解決しようとする課題] 通常スピーカのボイスコイルは印加された電力に比例す
る熱を生じ、温度が上昇してインピーダンスが変動する
。この様な負荷に前記の様な性質の従来の増幅器を使用
した再生系では、ボイスコイルのインピーダンス変動に
つれてスピーカに流入する実質的な電力も変動する。言
い換えれば音楽信号の状態によって、同じ信号であるに
もかかわらず入力電力が異なることが考えられ、リニア
な再生が行われていないという解決すべき課題があった
[Problems to be Solved] Normally, the voice coil of a speaker generates heat in proportion to the applied power, and as the temperature rises, the impedance fluctuates. In a reproduction system using a conventional amplifier with the above-mentioned characteristics as such a load, the actual power flowing into the speaker also varies as the impedance of the voice coil varies. In other words, depending on the state of the music signal, the input power may differ even though the signal is the same, and linear reproduction is not performed, which is a problem to be solved.

そこで本発明は、温度変化によるインピーダンス変動に
追従する出力電圧変化機能を増幅器に持たせ、信号電圧
レベルで等しい音楽信号の増幅に於てはスピーカ入力電
力も常に等しくなるような構成の増幅器回路とすること
で、上記従来例の有する課題を解決することを目的とす
る。
Therefore, the present invention provides an amplifier circuit with an output voltage change function that follows impedance fluctuations caused by temperature changes, and has a configuration in which the speaker input power is always the same when amplifying music signals with the same signal voltage level. By doing so, the present invention aims to solve the problems of the above-mentioned conventional example.

[課題を解決するための手段] 上記した目的を達成するための本発明に係る増幅器回路
を、第1〜3図を用いて本発明第1実施例を説明すると
、動作中のスピーカインピーダンスを検出するインピー
ダンス検出手段1と、当該インピーダンス検出手段1か
ら出力される制御情報信号を受けて、前記スピーカ6の
ボイスコイル発熱によるインピーダンス変化に対応して
スピーカに対する出力電圧を変化せしめる機能を持たせ
た出力電圧制御手段2とを有することを特徴とする増幅
器回路であり、更に第4〜5図に示す第2実施例として
、被接続スピーカ入力電力レベル相当情報に基き制御情
報信号を出力する制御情報発生手段3と、当該制御情報
発生手段3からの制御情報信号を受けてスピーカに印加
する出力電圧を変化せしめる機能を持たせた出力電圧制
御手段4とを有し、予め知られている前記被接続スピー
カ6の印加重力対ボイスコイル熱・インピーダンスの変
動応答特性相当情報を入力することによって、当該スピ
ーカのボイスコイル発熱によるインピーダンス変化に対
応してスピーカ入力電力を設定レベルに保持せしめるこ
とを特徴とする増幅器回路である。
[Means for Solving the Problems] A first embodiment of the amplifier circuit according to the present invention for achieving the above object will be described with reference to FIGS. 1 to 3. an output having a function of receiving a control information signal outputted from the impedance detecting means 1 and changing an output voltage to the speaker in response to a change in impedance due to voice coil heat generation of the speaker 6; The amplifier circuit is characterized in that it has a voltage control means 2, and as a second embodiment shown in FIGS. means 3, and an output voltage control means 4 having a function of receiving a control information signal from the control information generating means 3 and changing the output voltage applied to the speaker, The present invention is characterized in that by inputting information corresponding to the variation response characteristic of the applied load force versus the voice coil heat/impedance of the speaker 6, the speaker input power is maintained at a set level in response to impedance changes due to voice coil heat generation of the speaker. It is an amplifier circuit.

[作 用] そして、此の様な構成の増幅器回路では、例えばスピー
カ入力レベルが高くなってボイスコイル温度が上昇し、
インピーダンスが高くなった場合に、従来の増幅器であ
れば設定電圧レベルが一定であるので入力電力レベルは
実質的に低下してスピーカからの出力音圧レベルはリニ
アに再生されないが、本発明実施例ではインピーダンス
検出手段1がスピーカインピーダンスをサーチしてボイ
スコイルインピーダンス変動に関する情報信号を出力し
、当該情報信号によってスピーカ駆動用の増幅器回路に
含まれる出力電圧制御手段2を制御してスピーカに設定
電圧レベルに対する所定の入力電力レベルを印加するよ
うに増幅器の出力電圧を高めるので、スピーカはインピ
ーダンス変動にかかわらずリニアに駆動されることにな
る。
[Function] In an amplifier circuit configured like this, for example, when the speaker input level becomes high, the voice coil temperature rises,
When the impedance becomes high, in the case of a conventional amplifier, the set voltage level is constant, so the input power level substantially decreases and the output sound pressure level from the speaker is not reproduced linearly, but in the embodiment of the present invention Then, the impedance detection means 1 searches the speaker impedance and outputs an information signal regarding voice coil impedance fluctuation, and the information signal controls the output voltage control means 2 included in the amplifier circuit for driving the speaker to set the voltage level to the speaker. Since the output voltage of the amplifier is increased to apply a predetermined input power level to the speaker, the speaker will be driven linearly regardless of impedance variations.

第1実施例ではインピーダンス変動のサーチをリアルタ
イムで行って出力電圧制御手段2を制御する構成とし、
いかなる熱時定数や放熱特性のスピーカであっても直ち
に対応可能であることを特徴とする。
The first embodiment has a configuration in which the output voltage control means 2 is controlled by searching for impedance fluctuations in real time,
The present invention is characterized in that it can be immediately applied to speakers with any thermal time constant or heat dissipation characteristics.

第2実施例では接続されるべきスピーカの発熱による温
度上昇時定数や放熱特性等からスピーカの総合的な熱・
インピータダンス変動特性を予め測定しておき、該測定
で得た入力電力に対するスピーカの総合的な熱・インピ
ータダンスの変動特性相当情報を制御情報発生手段3、
若しくは出力電圧制御手段4に入力し、得た制御情報と
設定電圧レベルとから出力電圧制御手段4を作動させて
所定の入力電力レベルがスピーカに印加されるように増
幅器の出力電圧を高める構成である。
In the second embodiment, the speaker's overall heat and
The impedance fluctuation characteristics are measured in advance, and the control information generating means 3 generates information corresponding to the overall heat/impedance fluctuation characteristics of the speaker with respect to the input power obtained by the measurement.
Alternatively, the output voltage control means 4 is inputted to the output voltage control means 4, and the output voltage control means 4 is operated based on the obtained control information and the set voltage level to increase the output voltage of the amplifier so that a predetermined input power level is applied to the speaker. be.

この第2実施例は使用に際して接続するスピカの熱特性
を測定しなければならないが、接続スピーカが決められ
ている場合はインピーダンス検出手段が不要となるので
、機器の構成を安価なものとすることができる特徴を有
し、例えば増幅器を組込んだスピーカ装置に適した構成
である。
In this second embodiment, it is necessary to measure the thermal characteristics of the connected speakers when used, but if the connected speakers are determined, impedance detection means is not required, so the configuration of the device can be made inexpensive. This configuration is suitable for, for example, a speaker device incorporating an amplifier.

[実施例] 第1図は本発明の第1実施例の基本構成で、増幅器5、
スピーカ6を含めた再生系を示し、1はスピーカ6のボ
イスコイルインピーダンスをスピーカ動作中にリアルタ
イムで検出するインピーダンス検出手段である。具体的
構成と機能を第2図によって説明すると、直流電源1a
によってスピーカのボイスコイルに微小直流電流を流し
、ローパスフィルタ1bでボイスコイル両端の直流電圧
のみを検出し、演算回路ICによって電圧に変換して制
御情報信号Ecを出力する。本実施例のローパスフィル
タ1bはカットオフ周波数il!!、減衰量+8DB1
0c1、バターワース特性を有するフィルタを使用して
いる。また、検出用の微小直流電流と、スピーカ駆動用
の音声信号電流とはチョークコイル1dとコンデサ1e
及び上記ローパスフィルタ1bとによって回路的に完全
に分離されている。
[Embodiment] FIG. 1 shows the basic configuration of the first embodiment of the present invention, which includes an amplifier 5,
A reproduction system including a speaker 6 is shown, and 1 is an impedance detection means for detecting the voice coil impedance of the speaker 6 in real time while the speaker is operating. To explain the specific configuration and functions with reference to FIG. 2, the DC power supply 1a
A minute DC current is passed through the voice coil of the speaker, and only the DC voltage across the voice coil is detected by the low-pass filter 1b, which is converted into a voltage by the arithmetic circuit IC and outputted as a control information signal Ec. The low-pass filter 1b of this embodiment has a cutoff frequency il! ! , attenuation +8DB1
0c1, a filter with Butterworth characteristics is used. In addition, the minute DC current for detection and the audio signal current for driving the speaker are connected to the choke coil 1d and capacitor 1e.
and the low-pass filter 1b.

当該インピーダンス検出手段1から出力された制御情報
信号Ec(電圧)は出力電圧制御手段2に入力され、再
生系の入力電圧Eiを変化させて増幅器5の入力電圧E
Oとし、スピーカ6駆動用の増幅器5の入力電圧を制御
してスピーカ6の入力電力の変動を補正する。出力電圧
制御手段2の構成例を第3図に示す。2a、 2bは対
数器で、対数器2aには入力信号Eiが、対数器2bに
は制御情報信号Ecが夫々入力され、各対数器の出力は
加算器2cで加算され、更に逆対数器2dによってEo
=Ei・Ecとなって結果的に制御情報信号Ecによっ
て利得が変化したことになる。
The control information signal Ec (voltage) output from the impedance detection means 1 is input to the output voltage control means 2, which changes the input voltage Ei of the reproduction system to adjust the input voltage E of the amplifier 5.
0, and the input voltage of the amplifier 5 for driving the speaker 6 is controlled to correct fluctuations in the input power of the speaker 6. An example of the configuration of the output voltage control means 2 is shown in FIG. 2a and 2b are logarithm units, the input signal Ei is input to the logarithm unit 2a, the control information signal Ec is input to the logarithm unit 2b, and the outputs of each logarithm unit are added by an adder 2c, and further, an anti-logarithm unit 2d is input. By Eo
=Ei·Ec, and as a result, the gain is changed by the control information signal Ec.

尚、インピーダンス検出手段としては上記構造以外にも
等価な機能を有する限りどの様な手段が採用されてもよ
く、出力電圧制御手段としては増幅器5の電圧増幅回路
をVollag Con1+olld Amptier
として等測的に増幅器5の総合ゲインを変化させる方式
でも良い。
In addition, as the impedance detection means, any means other than the above structure may be adopted as long as it has an equivalent function, and as the output voltage control means, the voltage amplification circuit of the amplifier 5 may be used as a Vollag Con1+old Amptier.
A method may also be used in which the total gain of the amplifier 5 is changed isometrically as follows.

第4図は本発明の第2実施例の基本構成で、同じく増幅
器5、スピーカ6を含めた再生系を示し、3は制御情報
発生手段であって、実測によって予め知られている前記
被接続スピーカの印加電力対ボイスコイル熱自インピー
ダンスの変動応答特性相当情報Esを入力端子3aから
入力すると共に、スピーカへの入力電力情報Eが入力さ
れて、制御情報信号Ecを出力する。又、場合によって
前記変動応答特性相当情報Exは入力端子4aから出力
信号制御手段4に入力されて増幅器5の入力信号Eoと
なり、前述の第1実施例と同じくボイスコイルインピー
ダンスが変動してもスピーカ入力電力を一定レベルに保
持する。
FIG. 4 shows the basic configuration of a second embodiment of the present invention, which also shows a reproduction system including an amplifier 5 and a speaker 6, and 3 is a control information generating means, which is known in advance by actual measurement. Information Es corresponding to the variation response characteristic of the applied power to the voice coil versus the thermal self-impedance of the speaker is inputted from the input terminal 3a, and information E of the input power to the speaker is inputted, and a control information signal Ec is outputted. Further, depending on the case, the information Ex corresponding to the fluctuation response characteristic is inputted from the input terminal 4a to the output signal control means 4 and becomes the input signal Eo of the amplifier 5, so that even if the voice coil impedance fluctuates, the speaker Hold input power at a constant level.

又、変形例等回路構成によってはスピーカへの入力電力
情報Eに代えて再生系の入力信号E1がそのまま利用さ
れることもある。
Further, depending on the circuit configuration such as a modified example, the reproduction system input signal E1 may be used as is instead of the input power information E to the speaker.

第5図に於て、スピーカの印加電圧E(実線)に対して
温度変化がスピーカ固有の時定数をもった対数関数(立
上り)若しくは指数関数(立下り)で近似し得ると想定
して、ボイスコイルインピーダンスZの時間tに対する
変化を Z=ZC−1(El)・・・(点線)とし、入
力電圧Eを出力電圧制御手段4を作動させて E=e 
−LF[て・・・となるように補正すれば、スピーカ人
力Wは、 W=E2/z=e 2/Zc となって一定とすることが出来る。
In FIG. 5, assuming that the temperature change with respect to the applied voltage E (solid line) of the speaker can be approximated by a logarithmic function (rise) or an exponential function (fall) that has a time constant specific to the speaker, The change in voice coil impedance Z with respect to time t is set as Z=ZC-1(El) (dotted line), and the input voltage E is set by activating the output voltage control means 4 so that E=e
-LF[te..., the speaker power W can be kept constant as W=E2/z=e2/Zc.

ここで2cは、電圧Eに対して時間tが十分長く経過し
、発熱量と放熱量とが釣合った時のボイスコイルインピ
ーダンスの飽和値と考えてよい。
Here, 2c can be considered to be the saturation value of the voice coil impedance when the time t has passed sufficiently long with respect to the voltage E and the amount of heat generation and the amount of heat radiation are balanced.

前記温度特性の時定数はスピーカのボイスコイル仕様、
磁気回路等ボイスコイル近傍の部品の構造寸法で決定さ
れる当該スピーカに固有の値で予めスピーカごとに測定
され、制御情報発生手段3、又は出力信号制御手段4に
入力され、同手段のシミュレーション回路を設定する。
The time constant of the above temperature characteristic is based on the voice coil specifications of the speaker,
A value specific to the speaker determined by the structural dimensions of components near the voice coil such as a magnetic circuit is measured in advance for each speaker, and is input to the control information generation means 3 or the output signal control means 4, and is input to the simulation circuit of the same means. Set.

第6図は第1実施例の変形例に於ける出力信号制御手段
2であって、再生系の入力信号E1のステージでデジタ
ル信号処理する方式である。主要部はスピーカの公称イ
ンピーダンスRとインピーダンス検出手段1で得た実イ
ンピーダンスZ相当の制御情報信号すとから基準電圧E
dを得る演算器2jと、FIRフィルタ21及び当該F
IRフィルタ2fの係数を変化せしめる適応制御部2g
等からなり、入力信号Eiは^/D変換器2hでデジタ
ル化され、2分されて一方は前記演算器2jに入力され
て基準電圧Edとなり、他方はFIRフィルタ21に入
力される。
FIG. 6 shows the output signal control means 2 in a modification of the first embodiment, which is a system in which digital signal processing is performed at the stage of the input signal E1 of the reproduction system. The main part is the reference voltage E from the control information signal equivalent to the nominal impedance R of the speaker and the actual impedance Z obtained by the impedance detection means 1.
A computing unit 2j that obtains d, an FIR filter 21, and the F
Adaptive control unit 2g that changes the coefficients of the IR filter 2f
The input signal Ei is digitized by the /D converter 2h and divided into two parts, one of which is input to the arithmetic unit 2j and becomes the reference voltage Ed, and the other is input to the FIR filter 21.

基準電圧EdとFIRフィルタ21の出力とは比較され
て画情報間の誤差情報εは適応制御部2gに入力され、
FIRフィルタ2]の係数を適応変化させる。適応変化
を受けたFIRフィルタの出力はD/^変換器2jでア
ナログ化され、増幅器5の入力信号EOとなる。
The reference voltage Ed and the output of the FIR filter 21 are compared, and error information ε between the image information is input to the adaptive control unit 2g.
FIR filter 2] is adaptively changed. The output of the FIR filter subjected to the adaptive change is converted into an analog signal by a D/^ converter 2j, and becomes an input signal EO of the amplifier 5.

第7図は第2実施例の変形例に於ける制御情報発生手段
3と出力信号制御手段4であって、上記第1実施例の変
形例と同しく再生系の入力信号Eのステー・ジでデジタ
ル信号処理する方式である。
FIG. 7 shows the control information generation means 3 and the output signal control means 4 in a modification of the second embodiment, and shows the stage of the input signal E of the reproduction system as in the modification of the first embodiment. This is a method of digital signal processing.

入力信号EiはA/D変換器3hでデジタル化され、2
分割されて一方は入力信号情報として信号平均値計算部
3cに入力され平均レベルが計算されて制御情報信号E
cとなって出力信号制御手段4に印加される。他方は信
号遅延用メモリー3bにより上記平均レベル計算時間に
相当する遅延を受けて改めて入力信号相当情報Ei′ 
となって出力信号制御手段4に印加される。
The input signal Ei is digitized by the A/D converter 3h, and
One of the divided signals is inputted to the signal average value calculating section 3c as input signal information, the average level is calculated, and the control information signal E is obtained.
c and is applied to the output signal control means 4. The other side receives a delay corresponding to the above average level calculation time by the signal delay memory 3b, and then outputs the input signal equivalent information Ei' again.
and is applied to the output signal control means 4.

出力信号制御手段4の主体は演算処理装置4aであって
、入力端子牡から入力された変動応答特性相当情報Es
と制御情報信号Ecとを基にして入力信号相当情報Ei
′を変動させ、D/^変換器4bでアナログ化され、増
幅器5の入力信号Eelとなる。
The main body of the output signal control means 4 is an arithmetic processing unit 4a, and the fluctuation response characteristic equivalent information Es inputted from the input terminal
The input signal equivalent information Ei is based on the control information signal Ec and the control information signal Ec.
' is changed and converted into an analog signal by the D/^ converter 4b, and becomes the input signal Eel of the amplifier 5.

以上、本発明に係る増幅器回路について代表的と思われ
る実施例を基に詳述したが、本発明による回路構成は上
記実施例の構造に限定されるものではなく、前記したク
レーム記載の構成要件を具備し、本発明にいう作用を呈
し、以下に述べる効果を有する限りにおいて、適宜改変
して実施しうるちのである。
Above, the amplifier circuit according to the present invention has been described in detail based on the embodiments that are considered to be representative, but the circuit configuration according to the present invention is not limited to the structure of the above embodiments, and the constituent elements described in the claims described above are As long as it has the following features, exhibits the functions of the present invention, and has the effects described below, it may be implemented with appropriate modifications.

[効 果] 本発明に係る増幅器回路は以下に述べる効果を有する。[effect] The amplifier circuit according to the present invention has the following effects.

即ちスピーカ動作中にボイスコイル温度が上昇してイン
ピーダンスが変化しても、インピーダンス変動情報によ
ってスピーカに設定電圧レベルに対する所定の入力電力
レベルを印加するように増幅器の出力電圧を高めるので
、スピーカはインピーダンス変動にかかわらずリニアに
駆動されることになる。
In other words, even if the voice coil temperature rises and the impedance changes during speaker operation, the impedance fluctuation information increases the output voltage of the amplifier so as to apply a predetermined input power level to the speaker for the set voltage level, so the impedance of the speaker changes. It will be driven linearly regardless of fluctuations.

更に上記インピーダンスの変動がリアルタイムでサーチ
されるので、いかなる熱時定数や放熱特性のスピーカで
あっても、且つ動作時間がいかに長くても直ちに対応可
能であるので、例えば音が再生のように平均レベルが常
時変動するような場合に於て、平均レベルの変動に追従
して入力電力が補正されるので、ダイナミックレンジが
忠実に再現されると言う効果を有する。
Furthermore, since the above-mentioned impedance fluctuations are searched in real time, it is possible to immediately respond to any speaker with any thermal time constant or heat dissipation characteristics, and no matter how long the operating time is. In a case where the level constantly fluctuates, the input power is corrected to follow the fluctuations in the average level, which has the effect of faithfully reproducing the dynamic range.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明の第1実施例の構成図、第2図はインピ
ーダンス検出手段の一例の構成図、第3図は出力電圧制
御手段の一例の構成図、第4図は第2実施例の構成図、
第5図は第2実施例の出力電圧制御手段の機能説明図、
第6図は第1実施例の変形例の出力電圧制御手段の一例
の構成図、第7図は第2実施例の変形例の制御情報発生
手段及び出力電圧制御手段の一例の構成図である。 1はインピーダンス検出手段、2は出力電圧制御手段、
3は制御情報発生手段、4は出力電圧制御手段、5は増
幅器、6はスピーカである。
Fig. 1 is a block diagram of a first embodiment of the present invention, Fig. 2 is a block diagram of an example of impedance detection means, Fig. 3 is a block diagram of an example of output voltage control means, and Fig. 4 is a block diagram of an example of the output voltage control means. Configuration diagram,
FIG. 5 is a functional explanatory diagram of the output voltage control means of the second embodiment;
FIG. 6 is a configuration diagram of an example of an output voltage control means of a modification of the first embodiment, and FIG. 7 is a configuration diagram of an example of control information generation means and output voltage control means of a modification of the second embodiment. . 1 is an impedance detection means, 2 is an output voltage control means,
3 is a control information generating means, 4 is an output voltage control means, 5 is an amplifier, and 6 is a speaker.

Claims (1)

【特許請求の範囲】 1、動作中のスピーカのインピーダンスを検出するイン
ピーダンス検出手段(1)と、当該インピーダンス検出
手段(1)から出力される制御情報信号を受けて前記ス
ピーカのボイスコイル発熱によるインピーダンス変化に
対応してスピーカに印加する出力電圧を変化せしめる機
能を持たせた出力電圧制御手段(2)とを有することを
特徴とする増幅器回路。 2、被接続スピーカ入力電力レベル相当情報に基き制御
情報信号を出力する制御情報発生手段(3)と、当該制
御情報発生手段(3)からの制御情報信号を受けてスピ
ーカに印加する出力電圧を変化せしめる機能を持たせた
出力電圧制御手段(4)とを有し、予め知られている前
記被接続スピーカの印加電力対ボイスコイル熱・インピ
ーダンスの変動応答特性相当情報を入力することによっ
て、当該スピーカのボイスコイル発熱によるインピーダ
ンス変化に対応してスピーカ入力電力を設定レベルに保
持せしめることを特徴とする増幅器回路。 3、上記出力電圧制御手段(2)がFIRフィルタと当
該FIRフィルタの係数を変化せしめる適応制御部とか
らなるデジタル回路であることを特徴とする請求項1の
増幅器回路。 4、上記制御情報発生手段(3)が信号遅延用メモリー
と信号平均値計算部とからなるデジタル回路であるとと
もに、出力電圧制御手段(4)がデジタル信号処理装置
であることを特徴とする請求項2の増幅器回路。
[Claims] 1. An impedance detection means (1) for detecting the impedance of a speaker in operation, and an impedance detection means (1) that detects the impedance due to voice coil heat generation of the speaker in response to a control information signal output from the impedance detection means (1). 1. An amplifier circuit comprising: output voltage control means (2) having a function of changing the output voltage applied to a speaker in response to changes. 2. A control information generating means (3) for outputting a control information signal based on information corresponding to the connected speaker input power level, and an output voltage to be applied to the speaker upon receiving the control information signal from the control information generating means (3). The output voltage control means (4) is equipped with an output voltage control means (4) having a function of changing the output voltage, and by inputting information corresponding to the previously known variation response characteristics of the applied power to the voice coil heat/impedance of the connected speaker. An amplifier circuit characterized by maintaining speaker input power at a set level in response to impedance changes due to heat generation in the speaker's voice coil. 3. The amplifier circuit according to claim 1, wherein the output voltage control means (2) is a digital circuit comprising an FIR filter and an adaptive control section for changing coefficients of the FIR filter. 4. A claim characterized in that the control information generating means (3) is a digital circuit comprising a signal delay memory and a signal average value calculating section, and the output voltage controlling means (4) is a digital signal processing device. Term 2 amplifier circuit.
JP2017552A 1990-01-26 1990-01-26 Amplifier circuit Pending JPH03222508A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2017552A JPH03222508A (en) 1990-01-26 1990-01-26 Amplifier circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2017552A JPH03222508A (en) 1990-01-26 1990-01-26 Amplifier circuit

Publications (1)

Publication Number Publication Date
JPH03222508A true JPH03222508A (en) 1991-10-01

Family

ID=11947081

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2017552A Pending JPH03222508A (en) 1990-01-26 1990-01-26 Amplifier circuit

Country Status (1)

Country Link
JP (1) JPH03222508A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010525754A (en) * 2007-04-26 2010-07-22 アドバンスト・エナジー・インダストリーズ・インコーポレイテッド Method and apparatus for correcting the interaction between an electrical generator and a non-linear load
US7764797B2 (en) 2004-10-28 2010-07-27 Panasonic Corporation Speaker driving device and audio output system
US8716984B2 (en) 2009-06-29 2014-05-06 Advanced Energy Industries, Inc. Method and apparatus for modifying the sensitivity of an electrical generator to a nonlinear load

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7764797B2 (en) 2004-10-28 2010-07-27 Panasonic Corporation Speaker driving device and audio output system
JP2010525754A (en) * 2007-04-26 2010-07-22 アドバンスト・エナジー・インダストリーズ・インコーポレイテッド Method and apparatus for correcting the interaction between an electrical generator and a non-linear load
US8716984B2 (en) 2009-06-29 2014-05-06 Advanced Energy Industries, Inc. Method and apparatus for modifying the sensitivity of an electrical generator to a nonlinear load
US9225299B2 (en) 2011-04-18 2015-12-29 Advanced Energy Industries, Inc. Variable-class amplifier, system, and method

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