JP2003198281A - Audio signal amplifier - Google Patents

Audio signal amplifier

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Publication number
JP2003198281A
JP2003198281A JP2001398419A JP2001398419A JP2003198281A JP 2003198281 A JP2003198281 A JP 2003198281A JP 2001398419 A JP2001398419 A JP 2001398419A JP 2001398419 A JP2001398419 A JP 2001398419A JP 2003198281 A JP2003198281 A JP 2003198281A
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means
signal
converting
analog electrical
pulsed
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Michinori Naito
通範 内藤
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Taiko Denki Co Ltd
大宏電機株式会社
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Priority to JP2001398419A priority Critical patent/JP2003198281A/en
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Abstract

PROBLEM TO BE SOLVED: To obtain an audio signal amplifier using a D-class amplifier, capable of preventing the problem of the radiation being generated from a long metal wiring, leading to a loudspeaker.
SOLUTION: The audio signal amplifier is provided with an PWM (pulse width modulation) circuit 32 for converting an analog signal from digital equipment into a pulsed analog electrical signal, an electrical-to-optical transducer circuit for converting the pulsed analog electrical signal into an optical signal, an optical fiber cable 34 for transmitting the optical signal, an optical-to- electrical transducer circuit 36 for converting the optical signal from the cable 34 into a pulsed analog electrical signal, a driver 37 in a D class mode upon receiving the signal from the circuit 36, and an LPF (low-pass filter) 38 for converting the signal from the driver 37 into an analog signal. The output of the LPF 38 is used as the input of the loudspeaker.
COPYRIGHT: (C)2003,JPO

Description

【発明の詳細な説明】 【0001】 【発明の属する技術分野】この発明は、オーディオ信号増幅装置に関する。 BACKGROUND OF THE INVENTION [0001] [Technical Field of the Invention The present invention relates to an audio signal amplifying device. 特に、Dクラスで動作するDクラスアンプ機能を持つオーディオ信号増幅装置に関する。 More particularly, to an audio signal amplifying apparatus having a D class amplifier functions running D class. 【0002】 【従来の技術】Dクラスアンプは大きな出力を少ない損失で出力できる増幅器としてオーディオ機器に用いられつつある。 [0002] Class D amplifier is becoming used audio equipment as an amplifier that can be output with a small loss a large output. 出力が大きくとも大きな放熱器を必要としないので小型機器に好適である。 Is suitable for compact devices does not require a large radiator even greater output. 【0003】従来のDクラスアンプを用いたオーディオ信号増幅装置の構成を、図7に示す。 [0003] The configuration of the audio signal amplifier using the conventional D-class amplifier, shown in FIG. アンプ1は、アナログ信号入力端子2からのアナログ信号を受けて、PW Amplifier 1 receives an analog signal from the analog signal input terminal 2, PW
M(パルス幅変調)回路3でPWM(パルス幅変調)化したパルス化アナログ電気信号をDクラス動作でドライブするドライブ回路4を通して、LPF(ロー・パス・ M (pulse width modulation) circuit 3 PWM (Pulse Width Modulation) in phased pulsed analog electrical signal through the drive circuit 4 for driving the D class operation, LPF (low pass
フィルタ)5により高周波成分を取り除く。 Filter) 5 by removing the high frequency components. LPF5とスピーカ11の間は、長いメタル配線ケーブル8で電気接続されスピーカボックス12内のスピーカ11を駆動する。 Between LPF5 and the speaker 11 is electrically connected with a long metal wire cable 8 to drive a speaker 11 in speaker box 12. なお、7はアンプ1のアース端子、6はケーブル接続端子、9,10はスピーカ駆動端子を示す。 Incidentally, 7 ground terminal of the amplifier 1, the 6 cable connecting terminals, the 9,10 show speaker driving pin. 【0004】 【発明が解決しようとする課題】しかしながら、従来のDクラスアンプを用いたオーディオ信号増幅装置では、 [0004] The present invention is, however, an audio signal amplifier using the conventional D-class amplifier,
PWM(パルス幅変調)化したパルスの高周波成分がL PWM (Pulse Width Modulation) phased pulses of the high frequency component L
PF(ロー・パス・フィルタ)5で充分減衰されないので、スピーカに至る長いメタルの配線からラジエーションが発生する問題があった。 Since PF is not (low pass filter) 5 with sufficient attenuation, the radiation sources from the long metal wires leading to the speaker there is a problem that occurs. そこで、本発明はこのような、スピーカに至る長いメタルの配線からラジエーションが発生する問題を防止できるDクラスアンプを用いたオーディオ信号増幅装置を提供することを目的とする。 The present invention aims to provide an audio signal amplifying device using a D class amplifier capable of preventing problems such, radiation sources is generated from a long metal wire leading to the speaker. 【0005】 【課題を解決するための手段】上記の目的を達成するため、本発明では、パルス化アナログ電気信号を光信号に変換する電光変換手段と、前記光信号を伝達する光伝達手段と、該光伝達手段からの前記光信号をパルス化アナログ電気信号に変換する光電変換手段と、該光電変換手段からのパルス化アナログ電気信号を受けてDクラスで動作するドライブ手段と、該ドライブ手段からのパルス化アナログ電気信号をアナログ信号に変換する手段を備えるオーディオ信号増幅装置とする。 [0005] [Means for Solving the Problems] To achieve the above object, the present invention, the electro-optic conversion means for converting the pulsed analog electrical signal into an optical signal, an optical transmission means for transmitting said optical signal a photoelectric conversion means for converting the optical signal from the light transmitting means in pulsed analog electrical signal, and drive means for operating in class D receives the pulsed analog electrical signals from the photoelectric conversion means, said drive means a pulsed analog electrical signal from the audio signal amplifying device comprising means for converting the analog signal. これによって、スピーカケーブルを軽い安価な光伝達手段としての光ケーブルによる接続とすることができ、スピーカに至る長いメタルの配線からラジエーションが発生するのを防止することができる。 Thus, it is possible to the connection by an optical cable as a light inexpensive optical transmission means speaker cable, the radiation sources from the long metal wires leading to the speaker can be prevented from occurring. さらに、メタルケーブルを用いる場合に比べ、外来接触抵抗の影響を排除できる。 Furthermore, compared with the case of using a metal cable, it can eliminate the influence of extraneous contact resistance. 【0006】また、前記電光変換手段の前に、アナログ信号をパルス化アナログ電気信号に変換する手段を、設ければ、PWM等のパルス化アナログ信号を持たないデジタル機器からの入力に対しても対応ができるオーディオ信号増幅装置とすることができる。 Further, prior to the electro-optic conversion means, a means for converting the analog signal to a pulsed analog electrical signals, provided if, even for an input from a digital device that does not have a pulsed analog signal such as PWM It may be an audio signal amplifying device capable corresponds. 【0007】また、パルス化アナログ電気信号を光信号に変換する電光変換手段を前記光伝達手段の発光側コネクタ内に実装すれば、分離された装置の一部をまとめることができ、オーディオ信号増幅装置の接続を簡単とできる。 [0007] By implementing optic converter means for converting the pulsed analog electrical signal to an optical signal to the light emitting side in a connector of the light transmitting means, it is possible to combine part of the separated system, the audio signal amplification the connection of the device can be simplified. 【0008】また、前記アナログ信号をパルス化アナログ電気信号に変換する手段と、前記パルス化アナログ電気信号を光信号に変換する電光変換手段とを前記光伝達手段の発光側コネクタ内に実装すれば、PWM回路(パルス幅変調回路)を持たないデジタル機器からの入力に対しても対応ができ、分離された装置の一部をまとめることができてオーディオ信号増幅装置の接続を簡単とできる。 Further, means for converting said analog signal to a pulsed analog electrical signal or implementing a optic converter means for converting the pulsed analog electric signal into an optical signal to the light emitting side in a connector of the light transmitting means , can also respond to input from the digital device does not have the PWM circuit (pulse width modulation circuit) can be simplified connection of the audio signal amplifying device can combine some of the separated device. 【0009】また、前記光伝達手段からの前記光信号をパルス化アナログ電気信号に変換する光電変換手段と、 Further, a photoelectric conversion means for converting the optical signal from the optical transmission means in pulsed analog electrical signal,
該光電変換手段からのパルス化アナログ電気信号を受けてDクラスで動作するドライブ手段と、該ドライブ手段からのパルス化アナログ電気信号をアナログ信号に変換するアナログ化手段とを、前記光伝達手段の受光側コネクタ内に実装すれば、分離された装置の一部をまとめることができてオーディオ信号増幅装置の接続を簡単とできる。 And drive means for operating in Class D receives the pulsed analog electrical signals from the photoelectric conversion means, the analog means for converting the pulsed analog electrical signals from the drive means into an analog signal, said light transmitting means by implementing the light-receiving side in the connector, the connection of the audio signal amplifying device can simplified be able to combine part of the separated device. 【0010】また、前記光伝達手段からの前記光信号をパルス化アナログ電気信号に変換する光電変換手段と、 Further, a photoelectric conversion means for converting the optical signal from the optical transmission means in pulsed analog electrical signal,
該光電変換手段からのパルス化アナログ電気信号を受けてDクラスで動作するドライブ手段と、該ドライブ手段からのパルス化アナログ電気信号をアナログ信号に変換するアナログ化手段と、これに接続したスピーカと、電源手段とをスピーカ収納手段内に収納し、前記光電変換手段には光電変換素子と直流分検出手段を、前記電源手段には該直流分検出手段で検出された直流分によりオン・オフするスイッチ手段を設けることとすれば、取り扱い易いオーディオ信号増幅装置とすることができる。 And drive means for operating in Class D receives the pulsed analog electrical signals from the photoelectric conversion means, and analog means for converting the pulsed analog electrical signals from the drive means into an analog signal, a speaker connected thereto and a power supply unit housed in a speaker housing unit, the DC component detecting means and the photoelectric conversion element in the photoelectric conversion means, on and off by the DC component detected by the DC component detecting means to said power supply means if the provision of the switching means may be a handle easily the audio signal amplifying device. 【0011】 【発明の実施の形態】以下本発明の実施の形態を図示例と共に説明する。 [0011] be described with PREFERRED EMBODIMENTS The embodiment illustrated examples below the present invention. 【0012】図1は、本発明による第1実施例のオーディオ信号増幅装置50と、従来のデジタル機器との接続を示した回路ブロック図である。 [0012] Figure 1 is an audio signal amplifying apparatus 50 of the first embodiment according to the present invention, is a circuit block diagram showing the connection of a conventional digital devices. 従来のデジタル機器1 Conventional digital equipment 1
3は、ストレージ要素14からのデジタル信号を復調器15で復調し、デルタ・シグマ(ΔΣ)変調器(回路) 3 demodulates the digital signal from the storage element 14 in the demodulator 15, a delta-sigma (.DELTA..SIGMA) modulator (circuit)
16でデジタル・アナログ変換を行う。 It performs digital-to-analog conversion 16. LPF(ロー・ LPF (Low
パス・フィルタ)17によりこのアナログ信号の高周波成分を取り除き、出力としている。 By-pass filter) 17 removes the high frequency component of the analog signal, and an output. 【0013】本発明による第1実施例のオーディオ信号増幅装置50は、アンプ31と、スピーカ収納手段としてのスピーカボックス35と、両者を繋ぐ光伝達手段としてのここでは光ケーブル34と、からなる。 [0013] The present invention first embodiment the audio signal amplifying device 50 according to the an amplifier 31, a speaker box 35 serving as a speaker housing means, and optical cable 34 in this case as an optical transmission means connecting both made of. アンプ3 Amplifier 3
1は、デジタル機器13からのアナログ出力を受けて、 1 receives the analog output from the digital devices 13,
パルス化アナログ電気信号に変換する手段であるPWM PWM is a means for converting the pulsed analog electrical signal
(パルス幅変調)回路32とこのパルス化アナログ電気信号を受けて、これを光信号に変換する電光変換手段としての電光変換素子を含む電光変換回路33からなる。 (Pulse width modulation) circuit 32 and receives the pulsed analog electrical signal, comprising this from the electro-optic conversion circuit 33 including the electro-optic conversion element as electro-optic conversion means for converting the optical signal.
スピーカボックス35は、光ケーブル34からの光信号をパルス化アナログ電気信号に変換する光電変換手段としての光電変換素子を含む光電変換回路36と、このパルス化アナログ電気信号を受けてDクラスで動作するドライブ手段としてのドライバ37と、ドライバ37からのパルス化アナログ電気信号をアナログ信号に変換する手段でもあるLPF(ロー・パス・フィルタ)38と、 Speaker box 35 includes a photoelectric conversion circuit 36 ​​including a photoelectric conversion element as a photoelectric conversion means for converting the optical signal from the optical cable 34 to the pulse of the analog electrical signals, operating at D class receiving the pulsed analog electrical signal a driver 37 as drive means, a LPF (low pass filter) 38 to a pulsed analog electrical signal is also a means for converting the analog signal from the driver 37,
これにつながれたスピーカ39を収納している。 Housing the speaker 39 which is connected to this. さらに、図3に示すように、光電変換手段36には、光電変換素子36aに接続された直流分検出手段36bと、増幅器36cが形成されている。 Furthermore, as shown in FIG. 3, the photoelectric conversion unit 36 ​​includes a DC component detecting means 36b which is connected to the photoelectric conversion elements 36a, the amplifier 36c are formed. 電源手段44は、直流分検出手段36bで検出された直流分により電源部42をオン・オフするトリガ回路40とこれにより動作するスイッチ41を設けている。 Power supply means 44 is provided with a switch 41 which is operated by this trigger circuit 40 for turning on and off the power unit 42 by the DC component detected by the DC component detecting means 36b. この例では外部電源43がスイッチ41を介して電源部42に接続される。 External power supply 43 in this example is connected to the power supply unit 42 via the switch 41. 【0014】図3は、光電変換回路36の具体的回路の1例を示している。 [0014] Figure 3 shows an example of a specific circuit of the photoelectric conversion circuit 36. ホト・ダイオード(PD)36aで受けた光信号は電気信号に変換され直流成分検出手段としてのロー・パス・フィルタ36bを通して直流成分がトリガ回路40に送られる。 Optical signal received by the photo diode (PD) 36a is the DC component is fed to the trigger circuit 40 through a low-pass filter 36b as converted into an electrical signal DC component detecting means. 増幅器36cは、ホト・ダイオード(PD)36aからの信号を増幅しその出力をドライバ37に与える。 Amplifier 36c amplifies the signal from the photo diode (PD) 36a giving its output to the driver 37. 【0015】スイッチ41はアンプ31側の電源が入り光ケーブルに光信号が送られると図3のように構成された光電変換回路の光電変換素子に直流成分が発生し、その直流成分によりONされスピーカボックス35内の電源部42をONにする。 The switch 41 is a DC component is generated in the photoelectric conversion element of the photoelectric conversion circuit, which is configured as an optical signal to the optical cable will power the amplifier 31 side is sent 3 is turned ON by the DC component speaker the power supply unit 42 of the box 35 to oN. これによりスピーカボックス側の手動電源スイッチを省略することもできる。 Thus it is also possible to omit the manual power switch of the speaker box side. 【0016】なお、ドライバ37にはDクラスアンプとして作動するためPWM信号に応答する立ち上がり時間の早い素子が要求される。 [0016] Incidentally, fast device rise time required to respond to the PWM signal to operate as a D-class amplifier to the driver 37. パルス化アナログ電気信号はドライバ37の出力までで、LPF38によりアナログ信号に戻し、スピーカ39を駆動する。 Pulsed analog electrical signal is to the output of the driver 37, back into an analog signal by LPF 38, and drives the speaker 39. ドライバ37とスピーカ39を近傍に配置できるのでラジエーションが発生しにくくLPF38の特性は何段にも渡るフィルタ構造をとることなく簡単なもので済む。 Since the driver 37 and the speaker 39 can be placed near the characteristics of the radiation sources is less likely to occur LPF38 requires only one simple without taking a filter structure over many stages. 【0017】さらに、スピーカユニット39のボイスコイルが高周波の放射を抑制して作られていればLPFを介さず直接ユニットを駆動しても良い。 Furthermore, it may be driven directly unit not through the LPF if the voice coil of the speaker unit 39 is made to suppress the high-frequency radiation. 【0018】図2は、本発明による第2実施例のオーディオ信号増幅装置と、新たな従来のデジタル機器との接続を示した回路ブロック図である。 [0018] Figure 2, an audio signal amplifier of the second embodiment according to the present invention, is a circuit block diagram showing the connection of a new conventional digital devices. 従来のデジタル機器18は、ストレージ要素14からのデジタル信号を復調器15で復調し、デルタ・シグマ(ΔΣ)変調器16でデジタル・アナログ変換を行い出力としている。 Conventional digital device 18 demodulates the digital signal from the storage element 14 in the demodulator 15, and an output subjected to digital-to-analog converter in a delta-sigma (.DELTA..SIGMA) modulator 16. 【0019】このようなデジタル機器に対しては、電光変換回路33のみを持ったアンプ29を図1のアンプ3 [0019] For such digital devices, an amplifier 29 having only electro-optic conversion circuit 33 of FIG. 1 amplifier 3
1に代えて使用できる。 It can be used in place of the 1. この場合、受光側の回路は全く図1と同じでよく、Dクラスで動作するドライバも正常に動作する。 In this case, the circuit of the light receiving side is well exactly the same as in FIG. 1, driver operating D class to work properly. 【0020】図4は、本発明による第3実施例のオーディオ信号増幅装置の部分、特にヘッドホン等に利用できるスピーカ側の端末部分、を示す回路ブロック図である。 [0020] Figure 4 is a part of the audio signal amplifying device according to the third embodiment of the present invention, is a circuit block diagram showing a terminal portion of the speaker side which particularly applicable to a headphone or the like. 電源部42はここでは電池であり、図1のスピーカボックス35内の回路と基本的機能は同じであるので対応するものには図1と同番号を付している。 Power supply unit 42 is battery here, the circuit basically functions of the speaker box 35 in FIG. 1 are denoted by the same numbers as Figure 1 to a corresponding is the same. この回路がヘッドホン51に組み込まれ、ヘッドホン51は、光ファイバケーブルでデジタル機器へ接続される。 This circuit is incorporated in the headphone 51, a headphone 51 is connected by an optical fiber cable to the digital device. 【0021】図5は、本発明における、光伝達手段としての光ファイバケーブル34の発光側コネクタ34a内に実装した回路例を示す説明図である。 [0021] Figure 5, in the present invention, is an explanatory diagram showing a circuit example of mounting the light emitting side connector 34a of the optical fiber cable 34 as an optical transmission means. デジタル機器1 Digital equipment 1
3からのアナログ信号をパルス化アナログ電気信号に変換するPWM回路(パルス幅変調回路)32と、パルス化アナログ電気信号を光信号に変換する電光変換回路3 A PWM circuit (pulse width modulation circuit) 32 for converting an analog signal into a pulsed analog electrical signals from the 3, electro-optic conversion circuit 3 for converting the pulsed analog electrical signal into an optical signal
3とを光伝達手段の発光側コネクタ34a内に実装している。 3 and are mounted on the light emitting side connector 34a of the light transmitting means. これによって、分離された装置の一部を光ファイバケーブル34と一体にまとめることができてオーディオ信号増幅装置の接続を簡単とできる。 Thus, the connection of the audio signal amplifying device can simplified be able to combine part of the separated system integrated with optical fiber cable 34. 【0022】図6は、本発明における、光伝達手段としての光ファイバケーブル34の受光側コネクタ34b内に実装した回路例を示す説明図である。 [0022] Figure 6, in the present invention, is an explanatory diagram showing a circuit example of mounting the light-receiving side connector 34b of the optical fiber cable 34 as an optical transmission means. 光伝達手段としての光ファイバケーブル34からの光信号をパルス化アナログ電気信号に変換する光電変換回路36と、光電変換手段からのパルス化アナログ電気信号を受けてDクラスで動作するドライバ37と、ドライバ37からのパルス化アナログ電気信号をアナログ信号に変換するアナログ化手段であるロー・パス・フィルタ38とを、光伝達手段の受光側コネクタ34b内に実装する。 A photoelectric conversion circuit 36 ​​for converting an optical signal from the optical fiber cable 34 as a light transmitting means in pulsed analog electrical signal, a driver 37 which operates in Class D receives the pulsed analog electrical signals from the photoelectric conversion means, a low-pass filter 38 is an analog means for converting the pulsed analog electrical signal from the driver 37 to an analog signal, to implement the light-receiving side connector 34b of the light transmitting means. これによって、分離された装置の一部を光ファイバケーブル34と一体にまとめることができてオーディオ信号増幅装置の接続を簡単とできる。 Thus, the connection of the audio signal amplifying device can simplified be able to combine part of the separated system integrated with optical fiber cable 34. 【0023】図5と図6とに示した、上記の構成を光ファイバケーブル34の発光側コネクタと受光側コネクタとすることによって、さらに分離された装置の一部を光ファイバケーブル34と一体にまとめることができてオーディオ信号増幅装置の接続を簡単とできる。 [0023] shown in FIGS. 5 and 6, the structure of the by-emitting side connector of the optical fiber cable 34 and the light receiving side connector, further portion of the separated device integrated with the optical fiber cable 34 the connection of the audio signal amplifying device can simplified be able to put together. 上記の図5と図6の構成は、ヘッドホン等の小型のスピーカを用いる場合に特に取り扱いを容易とできる。 Configuration of the above Figures 5 and 6, in particular facilitating the handling in the case of using a small speaker of the headphone or the like. 【0024】 【発明の効果】以上説明したように、本発明では、Dクラスで動作するDクラスアンプ機能を持つオーディオ信号増幅装置の配線接続ケーブルを光ファイバケーブルとできて、ラジエーションが発生しない。 [0024] As described in the foregoing, in the present invention, the wiring connection cables of the audio signal amplifying device having a D class amplifier functions running D class can the optical fiber cable, the radiation sources is not generated. また、電気接触抵抗の影響を無くして、ノイズを防止できる。 Further, by eliminating the influence of the electrical contact resistance can be prevented noise.

【図面の簡単な説明】 【図1】 本発明による第1実施例のオーディオ信号増幅装置と、従来のデジタル機器との接続を示した回路ブロック図である。 An audio signal amplifying device of the first embodiment according to the drawings: Figure 1 of the present invention, is a circuit block diagram showing the connection of a conventional digital devices. 【図2】 本発明による第2実施例のオーディオ信号増幅装置と、従来のデジタル機器との接続を示した回路ブロック図である。 [Figure 2] and the audio signal amplifying device of the second embodiment according to the present invention, is a circuit block diagram showing the connection of a conventional digital devices. 【図3】 本発明に用いる光電変換回路36の具体的回路の1例を示す。 Figure 3 shows an example of a specific circuit of the photoelectric conversion circuit 36 ​​used in the present invention. 【図4】 本発明による第3実施例のオーディオ信号増幅装置の部分、特にヘッドホン等に利用できるスピーカ側の端末部分、を示す回路ブロック図である。 Portion of the audio signal amplifying device of the third embodiment according to the invention, FIG, terminal portion of the speaker side which particularly applicable to a headphone or the like, a circuit block diagram showing a. 【図5】 本発明における、光伝達手段としての光ファイバケーブルの発光側コネクタ内に実装した回路例を示す説明図である。 In Figure 5 the present invention, it is an explanatory diagram showing a circuit example of mounting the light emitting side in the connector of the optical fiber cable as the optical transmission means. 【図6】 本発明における、光伝達手段としての光ファイバケーブルの受光側コネクタ内に実装した回路例を示す説明図である。 In [6] The present invention is an explanatory diagram showing a circuit example of mounting the light-receiving side in the connector of the optical fiber cable as the optical transmission means. 【図7】 従来のDクラスアンプを用いたオーディオ信号増幅装置の構成を示す、回路ブロック図である。 7 shows the configuration of the audio signal amplifier using the conventional D-class amplifier, a circuit block diagram. 【符号の説明】 13,18 デジタル機器、14 ストレージ要素、1 [Description of Reference Numerals] 13, 18 digital equipment, 14 storage elements, 1
5 復調器、16 デルタ・シグマ(ΔΣ)変調器(回路)、17 LPF(ロー・パス・フィルタ)、29, 5 demodulator, 16 a delta-sigma (.DELTA..SIGMA) modulator (circuit) 17 LPF (low pass filter), 29,
31 アンプ、32 PWM(パルス幅変調)回路、3 31 amp, 32 PWM (pulse width modulation) circuit, 3
3 電光変換回路、34 光ケーブル(光ファイバケーブル)、34a 発光側コネクタ、34b 受光側コネクタ、35 スピーカボックス、36 光電変換手段(光電変換回路)、36a 光電変換素子(ホト・ダイオード(PD))、36b 直流分検出手段、36c 3 optic converter circuit, 34 an optical cable (optical fiber cable), 34a light-emitting-side connector, 34b light receiving side connector, 35 a speaker box, 36 photoelectric conversion unit (photoelectric conversion circuit), 36a photoelectric conversion element (photo diode (PD)), 36b DC component detection means, 36c
増幅器、37 ドライバ、38 LPF(ロー・パス・ Amplifier, 37 the driver, 38 LPF (Low Pass
フィルタ)、39 スピーカ(スピーカユニット)、4 Filter), 39 speakers (speaker unit) 4
0 トリガ回路、41 スイッチ、42 電源部、43 0 trigger circuit, 41 a switch, 42 power supply unit, 43
外部電源、44 電源手段、50 オーディオ信号増幅装置、51 ヘッドホン。 External power supply, 44 power supply unit, 50 an audio signal amplifying device 51 headphones.

───────────────────────────────────────────────────── フロントページの続き Fターム(参考) 5D020 AC01 5J092 AA02 AA41 AA56 AA66 CA41 FA20 HA19 HA25 HA29 HA38 HA44 KA00 KA42 KA47 KA53 KA55 KA61 KA62 KA63 TA01 5J500 AA02 AA41 AA56 AA66 AC41 AF20 AH19 AH25 AH29 AH38 AH44 AK00 AK42 AK47 AK53 AK55 AK61 AK62 AK63 AT01 5K002 AA01 AA03 DA05 FA01 GA07 ────────────────────────────────────────────────── ─── front page of continued F-term (reference) 5D020 AC01 5J092 AA02 AA41 AA56 AA66 CA41 FA20 HA19 HA25 HA29 HA38 HA44 KA00 KA42 KA47 KA53 KA55 KA61 KA62 KA63 TA01 5J500 AA02 AA41 AA56 AA66 AC41 AF20 AH19 AH25 AH29 AH38 AH44 AK00 AK42 AK47 AK53 AK55 AK61 AK62 AK63 AT01 5K002 AA01 AA03 DA05 FA01 GA07

Claims (1)

  1. 【特許請求の範囲】 【請求項1】 パルス化アナログ電気信号を光信号に変換する電光変換手段と、前記光信号を伝達する光伝達手段と、該光伝達手段からの前記光信号をパルス化アナログ電気信号に変換する光電変換手段と、該光電変換手段からのパルス化アナログ電気信号を受けてDクラスで動作するドライブ手段と、該ドライブ手段からのパルス化アナログ電気信号をアナログ信号に変換する手段を備えるオーディオ信号増幅装置。 And optic converter means for converting the Patent Claims 1. A pulsed analog electrical signal into an optical signal, an optical transmission means for transmitting the optical signal, pulsing the optical signal from the light transmitting means photoelectric conversion means for converting the analog electrical signal into a drive means for operating in class D receives the pulsed analog electrical signals from the photoelectric conversion means, a pulsed analog electrical signals from the drive means into an analog signal audio signal amplifier comprising means. 【請求項2】 前記電光変換手段の前に、アナログ信号をパルス化アナログ電気信号に変換する手段を、設けたことを特徴とする請求項1記載のオーディオ信号増幅装置。 To wherein prior to said electro-optic conversion means, a means for converting the analog signal to a pulsed analog electrical signal, an audio signal amplifying apparatus according to claim 1, characterized in that provided. 【請求項3】 前記パルス化アナログ電気信号を光信号に変換する電光変換手段を前記光伝達手段の発光側コネクタ内に実装することを特徴とする請求項1に記載のオーディオ信号増幅装置。 Wherein the audio signal amplifier according to claim 1, characterized in that to implement the electro-optic conversion means for converting the pulsed analog electric signal into an optical signal to the light emitting side in a connector of the light transmitting means. 【請求項4】 前記アナログ信号をパルス化アナログ電気信号に変換する手段と、前記パルス化アナログ電気信号を光信号に変換する電光変換手段とを前記光伝達手段の発光側コネクタ内に実装することを特徴とする請求項2に記載のオーディオ信号増幅装置。 4. be mounted on the means for converting the pulsed analog electrical signal to an analog signal, the light emitting side in a connector of the light transmitting means and optic converter means for converting the pulsed analog electrical signal into an optical signal audio signal amplifier of claim 2, wherein. 【請求項5】 前記光伝達手段からの前記光信号をパルス化アナログ電気信号に変換する光電変換手段と、該光電変換手段からのパルス化アナログ電気信号を受けてD 5. A photoelectric conversion means for converting the optical signal from the optical transmission means in pulsed analog electrical signals, D receives the pulsed analog electrical signals from the photoelectric conversion means
    クラスで動作するドライブ手段と、該ドライブ手段からのパルス化アナログ電気信号をアナログ信号に変換するアナログ化手段とを、前記光伝達手段の受光側コネクタ内に実装することを特徴とする請求項1乃至4のいずれかに記載のオーディオ信号増幅装置。 Claim to a drive means operating in a class, the analog means for converting the pulsed analog electrical signals from the drive means into an analog signal, characterized in that mounted on the receiving side in the connector of the light transmitting means 1 to the audio signal amplifying device according to any one of 4. 【請求項6】 前記光伝達手段からの前記光信号をパルス化アナログ電気信号に変換する光電変換手段と、該光電変換手段からのパルス化アナログ電気信号を受けてD 6. A photoelectric conversion means for converting the optical signal from the optical transmission means in pulsed analog electrical signals, D receives the pulsed analog electrical signals from the photoelectric conversion means
    クラスで動作するドライブ手段と、該ドライブ手段からのパルス化アナログ電気信号をアナログ信号に変換するアナログ化手段と、これに接続したスピーカと、電源手段とをスピーカ収納手段内に収納し、前記光電変換手段には光電変換素子と直流分検出手段を、前記電源手段には該直流分検出手段で検出された直流分によりオン・オフするスイッチ手段を設けることを特徴とする請求項1 And drive means for operating in the class, and storing a pulsed analog electrical signals from the drive means and the analog means for converting the analog signal, a speaker connected thereto, and a power supply unit in the speaker housing means, said photoelectric the DC component detecting means and the photoelectric conversion element to the converting means, the said power supply means and providing a switching means for turning on and off the DC component detected by the DC component detecting means according to claim 1
    乃至4のいずれかに記載のオーディオ信号増幅装置。 To the audio signal amplifying device according to any one of 4.
JP2001398419A 2001-12-27 2001-12-27 Audio signal amplifier Pending JP2003198281A (en)

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