JPH05328481A - Frequency doubling and mixing circuit - Google Patents
Frequency doubling and mixing circuitInfo
- Publication number
- JPH05328481A JPH05328481A JP4326729A JP32672992A JPH05328481A JP H05328481 A JPH05328481 A JP H05328481A JP 4326729 A JP4326729 A JP 4326729A JP 32672992 A JP32672992 A JP 32672992A JP H05328481 A JPH05328481 A JP H05328481A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- doubling
- low
- signal
- mixing circuit
- 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
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R5/00—Stereophonic arrangements
- H04R5/04—Circuit arrangements, e.g. for selective connection of amplifier inputs/outputs to loudspeakers, for loudspeaker detection, or for adaptation of settings to personal preferences or hearing impairments
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/04—Circuits for transducers, loudspeakers or microphones for correcting frequency response
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S1/00—Two-channel systems
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Stereophonic System (AREA)
- Circuit For Audible Band Transducer (AREA)
- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、小型のスピーカによる
音声信号の再生に関するものである。音声信号を高忠実
度で再生するには、人間の聴取可能な周波数範囲全体に
亘って音声を信頼的に再生しうる音響変換器が必要とな
る。この周波数範囲は２０〜２０，０００Ｈｚの範囲と
されている。しかし現実的には、最も忠実度の高いスピ
ーカシステムは４０〜２０，０００Ｈｚの周波数範囲内
の音声を再生しうる。これらの高忠実度のスピーカシス
テムは、この周波数範囲の高周波側を再生する小型変換
器（ツィータ）と、この周波数範囲の低周波側を再生す
る比較的大型の変換器（ウーハ）とを有する。一般にこ
れらのスピーカシステムはその寸法が大きく、聴取領域
中で可成り大きな空間を占める。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to reproduction of audio signals by a small speaker. High fidelity reproduction of audio signals requires acoustic transducers that can reliably reproduce audio over the entire human audible frequency range. This frequency range is set to 20 to 20,000 Hz. However, realistically, the highest fidelity speaker system can reproduce sound in the frequency range of 40-20,000 Hz. These high fidelity speaker systems have a small transducer (tweeter) that reproduces the high frequency side of this frequency range and a relatively large transducer (woofer) that reproduces the low frequency side of this frequency range. Generally, these speaker systems are large in size and occupy a considerably large space in the listening area.
【０００２】しかし、高忠実度の音声を楽しむも高忠実
度のスピーカシステムを有する高忠実度システムに対す
る空間を有していない消費者は多い。この問題を認識し
ている製造業者はこれらの消費者に対し小型のスピーカ
システムを有するコンパクトオーディオシステムを市販
している。しかし、スピーカシステムの寸法が比較的小
さい為に、４０〜１００Ｈｚ範囲の音声周波数を再生で
きない。これらのコンパクトオーディオシステムを用い
ている消費者はこの欠陥に気づき、このシステムに失望
している。However, many consumers enjoy high fidelity voice but do not have the space for a high fidelity system with a high fidelity speaker system. Manufacturers aware of this problem market compact audio systems with small speaker systems to these consumers. However, due to the relatively small dimensions of the speaker system, audio frequencies in the 40-100 Hz range cannot be reproduced. Consumers using these compact audio systems have noticed this flaw and are disappointed with the system.
【０００３】[0003]
【従来の技術】小型スピーカにおけるこの問題は新規な
ことではなく、過去に提起されている。特に、１９５４
年に発行されたハンドブック"Radiotron Designer's Ha
ndbook" の第１４．３項（第６１６頁）および第１５．
１２項（第６７６頁）では、２つ以上の周波数を非線形
増幅器に供給し、この非線形増幅器の出力が、大きい方
の入力周波数の各々を中心として上下に位置する和及び
差の周波数を含むようにする回路が提案されている。こ
のハンドブックには、最低の出力周波数が減衰される
と、和及び差の周波数が低音の音響的印象を生ぜしめる
傾向にあるということが述べられている。更に、“入力
周波数を２つよりも多くすると、効果が更に大きくな
り、可成り大きなひずみが低音を見かけ上強調する効果
を有するようになる。”ということが述べられている。
上記のハンドブックに開示されている他の解決策は単音
を調波で増強し、基本周波数を抑圧することである。This problem in small speakers is not new and has been raised in the past. In particular, 1954
Handbook "Radiotron Designer's Ha
ndbook ", section 14.3 (page 616) and section 15.
In paragraph 12 (page 676), two or more frequencies are supplied to a non-linear amplifier such that the output of the non-linear amplifier includes sum and difference frequencies located above and below each of the larger input frequencies. A circuit is proposed. It is stated in this handbook that, when the lowest output frequency is attenuated, the sum and difference frequencies tend to give a bass acoustical impression. Further, it is stated that “more input frequencies than two makes the effect even larger, and considerably large distortion has an effect of apparently emphasizing bass”.
Another solution disclosed in the above handbook is to harmonically enhance the single note and suppress the fundamental frequency.
【０００４】[0004]
【発明が解決しようとする課題】本発明の目的は、小型
のスピーカでこれから生じる音声にひずみを導入するこ
となく見かけ上の低音再生を強調することにある。SUMMARY OF THE INVENTION It is an object of the present invention to emphasize apparent bass reproduction in a small speaker without introducing distortion into the sound that is to be produced.
【０００５】[0005]
【課題を解決するための手段】本発明は低周波音声信号
を周波数２倍して混合する周波数２倍兼混合回路におい
て、周波数範囲が可成り広い入力音声信号を受ける入力
手段と、この入力手段に結合され、前記の音声信号の低
周波帯域中の信号成分をその広周波数範囲から分離する
分離手段と、この分離手段に結合され、前記の低周波帯
域中の信号成分の周波数を２倍にする周波数２倍手段
と、周波数２倍された前記の信号成分を前記の入力音声
信号と混合する混合手段とを具え、前記の低周波帯域中
の前記の信号成分が１オクターブ高い周波数位置にも現
れるようにしたことを特徴とする。SUMMARY OF THE INVENTION According to the present invention, in a frequency doubling / mixing circuit for doubling a frequency of a low frequency audio signal and mixing the input signal, an input means for receiving an input audio signal having a considerably wide frequency range, and this input means. And separating means for separating the signal component in the low frequency band of the audio signal from its wide frequency range, and doubled the frequency of the signal component in the low frequency band, coupled to this separating means. Frequency doubling means and mixing means for mixing the frequency doubled signal component with the input audio signal, and the signal component in the low frequency band is also located at a frequency position one octave higher. It is characterized by making it appear.
【０００６】米国特許第５，００３，６０５号明細書に
は、聞き取れない音の周波数を増倍又は２倍にすること
によりこの音の可聴度を高める回路を有する電気増強聴
診器が開示されている。この回路は２０Ｈｚよりも低
い、すなわち人間の可聴限界よりも低い周波数の信号を
処理し、これら信号を可聴レベルに高める。しかし、本
発明とは相違し、この米国特許は、低周波音声信号が人
間にとって聞き取りうるにもかかわらず、これらの低周
波音声信号を再生しえない不十分なスピーカの問題を提
示していない。US Pat. No. 5,003,605 discloses an electrically enhanced stethoscope having a circuit for increasing the audibility of inaudible sound by multiplying or doubling the frequency of that sound. There is. This circuit processes signals at frequencies below 20 Hz, i.e. below the human audible limit, and raises these signals to audible levels. However, unlike the present invention, this U.S. patent does not present the problem of an insufficient speaker that cannot reproduce these low frequency audio signals, even though the low frequency audio signals are audible to humans. ..
【０００７】[0007]
【実施例】本発明回路の基本的ブロック線図である図１
に示すように、入力端１０に供給されるステレオ左チャ
ネル信号は低域通過フィルタ１２を経て全波整流器１４
の一方の入力端に与えられる。入力端１６に供給される
ステレオ右チャネル信号は位相反転する低域通過フィル
タ１８を経て全波整流器１４の他方の入力端に与えられ
る。低域通過フィルタ１２及び１８は周波数が１００Ｈ
ｚよりも低い信号を通し、この周波数よりも高い信号を
６ｄＢ／オクターブで減衰させる。全波整流器１４は低
域通過フィルタ１２及び１８からの信号を合成し、合成
された信号の周波数を有効に２倍にする。全波整流器１
４の出力は例えば１００〜２００Ｈｚの通過帯域を有す
る狭帯域フィルタ２２に供給され、残留するいかなる低
及び高周波成分をも除去する。狭帯域フィルタ２２の出
力は、左チャネル信号入力端１０が抵抗２８により接続
されている左チャネル信号出力端２６に抵抗２４を介し
て供給される。狭帯域フィルタ２２の出力は同様に、右
チャネル信号入力端１６が抵抗３４により接続されてい
る右チャネル信号出力端３２にも抵抗３０を経て供給さ
れる。動作中、左及び右チャネル中の低周波信号成分は
主信号から分離され、合成され、周波数２倍される。こ
れにより得られた信号は次に例えば１００〜２００Ｈｚ
の通過帯域に周波数制限され、次にもとの左及び右チャ
ネル信号と再合成される。1 is a basic block diagram of the circuit of the present invention.
As shown in FIG. 3, the stereo left channel signal supplied to the input terminal 10 passes through the low pass filter 12 and the full wave rectifier 14.
Is applied to one input end of. The stereo right channel signal supplied to the input terminal 16 is supplied to the other input terminal of the full-wave rectifier 14 through the low-pass filter 18 that inverts the phase. The low pass filters 12 and 18 have a frequency of 100H.
Signals below z are passed, and signals above this frequency are attenuated by 6 dB / octave. Full-wave rectifier 14 combines the signals from low pass filters 12 and 18 and effectively doubles the frequency of the combined signal. Full wave rectifier 1
The output of 4 is fed to a narrow band filter 22 having a pass band of 100-200 Hz, for example, to remove any residual low and high frequency components. The output of the narrow band filter 22 is supplied via a resistor 24 to a left channel signal output end 26 to which the left channel signal input end 10 is connected by a resistor 28. The output of the narrow band filter 22 is also supplied via the resistor 30 to the right channel signal output end 32 to which the right channel signal input end 16 is connected by the resistor 34. In operation, the low frequency signal components in the left and right channels are separated from the main signal, combined and frequency doubled. The resulting signal is then 100-200 Hz, for example.
Frequency band limited to the passband of the signal and then recombined with the original left and right channel signals.
【０００８】本発明の回路の実際的な具体例を図２に示
す。左チャネル信号入力端１０は図示のように抵抗Ｒ１
を経て接地されており、しかもキャパシタＣ１及び抵抗
Ｒ２の直列回路を経て左チャネル信号出力端２６に接続
され、この出力端２６も抵抗Ｒ３を経て接地されてい
る。同様に右チャネル信号入力端１６も抵抗Ｒ４を経て
接地されており、しかもキャパシタＣ２及び抵抗Ｒ５の
直列回路を経て右チャネル信号出力端３２に接続され、
この出力端３２も抵抗Ｒ６を経て接地されている。左チ
ャネル信号入力端１０は更に、キャパシタＣ３及び抵抗
Ｒ７の直列回路を経て増幅器Ａ１の反転入力端に接続さ
れ、この反転入力端には右チャネル信号入力端１６もキ
ャパシタＣ４及び抵抗Ｒ８の直列回路を経て接続されて
いる。増幅器Ａ１のこの反転入力端は抵抗Ｒ９及びキャ
パシタＣ５の並列回路により増幅器Ａ１の出力端に接続
されており、この増幅器Ａ１の出力端が抵抗Ｒ１０によ
り増幅器Ａ２の反転入力端に接続され、増幅器Ａ２のこ
の反転入力端は抵抗Ｒ１１によりこの増幅器Ａ２の出力
端に接続されている。１８Ｖの直流電源は抵抗Ｒ１２
と、キャパシタＣ６及び抵抗Ｒ１３の並列回路との直列
回路を経て接地されており、抵抗Ｒ１２と並列回路との
間の接続点Ｊ１は増幅器Ａ１及びＡ２の非反転入力端に
結合されている。A practical embodiment of the circuit of the present invention is shown in FIG. The left channel signal input terminal 10 has a resistor R1 as shown.
Is connected to the left channel signal output terminal 26 via the series circuit of the capacitor C1 and the resistor R2, and this output terminal 26 is also grounded via the resistor R3. Similarly, the right channel signal input terminal 16 is also grounded via the resistor R4, and further connected to the right channel signal output terminal 32 via the series circuit of the capacitor C2 and the resistor R5.
The output terminal 32 is also grounded via the resistor R6. The left channel signal input terminal 10 is further connected to the inverting input terminal of the amplifier A1 via the series circuit of the capacitor C3 and the resistor R7, and the right channel signal input terminal 16 is also connected to the inverting input terminal of the series circuit of the capacitor C4 and the resistor R8. Connected through. This inverting input terminal of the amplifier A1 is connected to the output terminal of the amplifier A1 by the parallel circuit of the resistor R9 and the capacitor C5, the output terminal of this amplifier A1 is connected to the inverting input terminal of the amplifier A2 by the resistor R10, and the amplifier A2 is connected. This inverting input of is connected to the output of this amplifier A2 by a resistor R11. 18V DC power source is resistor R12
Is connected to the ground via a series circuit of a parallel circuit of a capacitor C6 and a resistor R13, and a connection point J1 between the resistor R12 and the parallel circuit is coupled to the non-inverting input terminals of the amplifiers A1 and A2.
【０００９】増幅器Ａ１の出力端はキャパシタＣ７及び
ダイオードＤ１の直列回路に接続され、キャパシタＣ７
及びダイオードＤ１間の接続点は抵抗Ｒ１４を経て接地
されているとともに抵抗Ｒ１５を経て（上述した１８Ｖ
の直流電源としうる）Ｂ+ 電圧源に接続されている。同
様に増幅器Ａ２の出力端はキャパシタＣ８及びダイオー
ドＤ２の直列回路に接続され、キャパシタＣ８及びダイ
オードＤ２間の接続点は抵抗Ｒ１６を経て接地されてい
るとともに抵抗Ｒ１７を経てＢ+ 電圧源に接続されてい
る。抵抗Ｒ１５及びＲ１７の目的は、ダイオードＤ１及
びＤ２をそれぞれ導通状態にバイアスし、広い信号レベ
ル範囲が全波整流器により２倍にされ、これにより回路
をより一層有効なものとすることにある。この場合、ダ
イオードＤ１及びＤ２は相互接続され且つポテンショメ
ータＰ１の固定抵抗と抵抗Ｒ１８とを経て接地されてい
る。ポテンショメータＰ１のスライダ（摺動子）は抵抗
Ｒ１９の一端に接続され、この抵抗の他端は一方では抵
抗Ｒ２０を経て増幅器Ａ３の非反転入力端に、他方では
キャパシタＣ９を経て増幅器Ａ３の出力端に接続されて
いる。ポテンショメータＰ１は、所定の分野で用いるス
ピーカの寸法に応じて、（周波数２倍されずに直接供給
される）直通信号と混合したい周波数２倍信号のレベル
値を調整するのに用いられる。その理由は、大型のスピ
ーカでは一般に周波数２倍信号のレベル値を小さくする
必要がある為である。これらの周波数２倍信号はあまり
にも大きなレベル値で存在すると障害となるおそれがあ
ることに注意すべきである。増幅器Ａ３の非反転入力端
はまたキャパシタＣ１０を経て接地され且つ抵抗Ｒ２１
を経て接続点Ｊ１に接続されている。増幅器Ａ３の反転
入力端は抵抗Ｒ２２を経て接続点Ｊ１に接続され且つ抵
抗Ｒ２３を経て増幅器Ａ３の出力端に接続されている。
増幅器Ａ３の出力端はキャパシタＣ１１と、抵抗Ｒ２４
と、他のキャパシタＣ１２との直列回路を経て接地さ
れ、抵抗Ｒ２４とキャパシタＣ１２との間の接続点は抵
抗Ｒ２５を経て左チャネル信号出力端２６に、抵抗Ｒ２
６を経て右チャネル信号出力端３２にそれぞれ接続され
ている。The output terminal of the amplifier A1 is connected to the series circuit of the capacitor C7 and the diode D1, and the capacitor C7 is connected.
The connection point between the diode D1 and the diode D1 is grounded via the resistor R14 and is also connected via the resistor R15 (18 V described above).
B + voltage source. Similarly, the output terminal of the amplifier A2 is connected to the series circuit of the capacitor C8 and the diode D2, and the connection point between the capacitor C8 and the diode D2 is grounded via the resistor R16 and connected to the B + voltage source via the resistor R17. ing. The purpose of the resistors R15 and R17 is to bias the diodes D1 and D2, respectively, into the conducting state, so that the wide signal level range is doubled by the full-wave rectifier, which makes the circuit even more effective. In this case, the diodes D1 and D2 are interconnected and are grounded via the fixed resistance of the potentiometer P1 and the resistance R18. The slider (slider) of the potentiometer P1 is connected to one end of a resistor R19, the other end of which is connected to the non-inverting input end of the amplifier A3 via the resistor R20 on the one hand and the output end of the amplifier A3 via the capacitor C9 on the other hand. It is connected to the. The potentiometer P1 is used to adjust the level value of the frequency doubled signal to be mixed with the direct signal (directly supplied without frequency doubled) depending on the size of the speaker used in a predetermined field. The reason is that a large speaker generally needs to reduce the level value of the frequency doubled signal. It should be noted that these frequency doubled signals can be disturbing if present at too high a level value. The non-inverting input of amplifier A3 is also grounded via capacitor C10 and resistor R21.
And is connected to the connection point J1. The inverting input terminal of the amplifier A3 is connected to the connection point J1 via the resistor R22 and to the output terminal of the amplifier A3 via the resistor R23.
The output terminal of the amplifier A3 has a capacitor C11 and a resistor R24.
And another capacitor C12 via a series circuit, and is grounded. The connection point between the resistor R24 and the capacitor C12 is connected to the left channel signal output terminal 26 via the resistor R25 and the resistor R2.
6 and are respectively connected to the right channel signal output terminals 32.
【００１０】上述した具体例では、素子Ｒ７，Ｒ８，Ｒ
９，Ｃ５及びＡ１が低域通過フィルタ１２及び１８を構
成し、素子Ｒ１４，Ｒ１５，Ｒ１６，Ｒ１７，Ｒ１８，
Ｄ１，Ｄ２及びＰ１が全波整流器１４を構成し、素子Ｒ
１９，Ｒ２０，Ｒ２２，Ｒ２３，Ｃ９，Ｃ１０及びＡ３
が狭帯域フィルタ２２を構成する。In the embodiment described above, the elements R7, R8, R
9, C5 and A1 form low pass filters 12 and 18, and elements R14, R15, R16, R17, R18,
D1, D2 and P1 constitute the full wave rectifier 14, and the element R
19, R20, R22, R23, C9, C10 and A3
Constitutes a narrow band filter 22.
【００１１】上述した実際例における素子の値は以下の
通りである。The values of the elements in the above practical example are as follows.
【表１】 R1, R4 100 KΩ R2, R3, R5, R6, R10, R11 10 KΩ R7, R8 15 KΩ R9 180 KΩ R12, R13 1 KΩ R14, R16, R18 3.3 KΩ R15, R17 39 KΩ R19, R20 150 KΩ R21 2 MΩ R22 27 KΩ R23, R24, R25, R26 47 KΩ C1, C2 0.1μF C3, C4 0.3μF C5 0.01 μF C6 100 μF C7, C8 5 μF C9, C10 0.008μF C11 1 μF C12 0.047μF D1, D2 1N4148 A1, A2, A3 LF347 P1 5 KΩ[Table 1] R1, R4 100 KΩ R2, R3, R5, R6, R10, R11 10 KΩ R7, R8 15 KΩ R9 180 KΩ R12, R13 1 KΩ R14, R16, R18 3.3 KΩ R15, R17 39 KΩ R19, R20 150 KΩ R21 2 MΩ R22 27 KΩ R23, R24, R25, R26 47 KΩ C1, C2 0.1 μF C3, C4 0.3 μF C5 0.01 μF C6 100 μF C7, C8 5 μF C9, C10 0.008 μF C11 1 μF C12 0.047 μF D1 , D2 1N4148 A1, A2, A3 LF347 P1 5 KΩ
【００１２】本発明は上述した実施例に限定されず、幾
多の変更を加えうること勿論である。The present invention is not limited to the above-mentioned embodiments, and it goes without saying that many modifications can be made.
【図１】本発明回路の基本的構成を示すブロック線図で
ある。FIG. 1 is a block diagram showing a basic configuration of a circuit of the present invention.
【図２】本発明回路の一具体例を示す回路図である。FIG. 2 is a circuit diagram showing a specific example of the circuit of the present invention.
１０，１６ 入力端 １２，１８ 低域通過フィルタ １４ 全波整流器 ２２ 狭帯域フィルタ ２６，３２ 出力端 10, 16 Input end 12, 18 Low pass filter 14 Full wave rectifier 22 Narrow band filter 26, 32 Output end
Claims (11)
る周波数２倍兼混合回路において、 周波数範囲が可成り広い入力音声信号を受ける入力手段
と、 この入力手段に結合され、前記の音声信号の低周波帯域
中の信号成分をその広周波数範囲から分離する分離手段
と、 この分離手段に結合され、前記の低周波帯域中の信号成
分の周波数を２倍にする周波数２倍手段と、 周波数２倍された前記の信号成分を前記の入力音声信号
と混合する混合手段とを具え、前記の低周波帯域中の前
記の信号成分が１オクターブ高い周波数位置にも現れる
ようにしたことを特徴とする周波数２倍兼混合回路。1. A frequency doubling / mixing circuit for doubling a frequency of a low-frequency audio signal and mixing the same, the input means receiving an input audio signal having a considerably wide frequency range, and the audio means coupled to the input means. Separating means for separating a signal component in the low frequency band of the signal from its wide frequency range; frequency doubling means coupled to the separating means for doubling the frequency of the signal component in the low frequency band, Mixing means for mixing the frequency-doubled signal component with the input audio signal, so that the signal component in the low frequency band appears at a frequency position one octave higher. A frequency double and mixed circuit.
において、前記の分離手段が低域通過フィルタを有して
いることを特徴とする周波数２倍兼混合回路。2. The frequency doubling / mixing circuit according to claim 1, wherein the separating means has a low-pass filter.
において、前記の周波数２倍手段が全波整流器を有して
いることを特徴とする周波数２倍兼混合回路。3. The frequency doubling / mixing circuit according to claim 1, wherein the frequency doubling means has a full-wave rectifier.
において、前記の音声信号は、左右別々のチャネルを有
するステレオ信号であり、前記の分離手段が前記の左右
の各チャネルで別々に前記の低周波帯域中の前記の信号
成分を分離させ、前記の周波数２倍手段が分離された左
右のチャネルの低周波成分を合成させ、次にこの合成さ
れた低周波成分信号の周波数を２倍にし、前記の混合手
段が周波数２倍された信号成分を前記のステレオ信号の
左および右チャネルと混合するようになっていることを
特徴とする周波数２倍兼混合回路。4. The frequency doubling / mixing circuit according to claim 1, wherein the audio signal is a stereo signal having separate left and right channels, and the separating means separates the left and right channels from each other. The signal component in the low frequency band is separated, the frequency doubling means combines the separated low frequency components of the left and right channels, and then the frequency of the combined low frequency component signal is set to 2 A frequency doubler / mixer circuit, wherein said doubling means mixes said frequency doubled signal component with the left and right channels of said stereo signal.
において、前記の分離手段が一対の低域通過フィルタを
有していることを特徴とする周波数２倍兼混合回路。5. The frequency doubling / mixing circuit according to claim 4, wherein said separating means has a pair of low-pass filters.
において、前記の低域通過フィルタの一方がこれに供給
される信号を位相反転するようになっていることを特徴
とする周波数２倍兼混合回路。6. The frequency doubling / mixing circuit according to claim 5, wherein one of the low pass filters is adapted to invert the phase of the signal supplied thereto. Double and mixed circuit.
において、前記の低域通過フィルタは周波数が１００Ｈ
ｚよりも低い信号を通すようになっていることを特徴と
する周波数２倍兼混合回路。7. The frequency doubler / mixer circuit according to claim 6, wherein said low pass filter has a frequency of 100H.
A frequency doubling / mixing circuit characterized by passing a signal lower than z.
において、前記の低域通過フィルタの減衰率が６ｄＢ／
オクターブであることを特徴とする周波数２倍兼混合回
路。8. The frequency doubler / mixer circuit according to claim 6, wherein the low-pass filter has an attenuation factor of 6 dB /
A frequency doubling / mixing circuit characterized by being an octave.
において、前記の周波数２倍手段が全波整流器を有して
いることを特徴とする周波数２倍兼混合回路。9. The frequency doubling / mixing circuit according to claim 4, wherein the frequency doubling means has a full-wave rectifier.
路において、この周波数２倍兼混合回路が、前記の周波
数２倍手段の出力端に結合された狭帯域フィルタを有
し、この狭帯域フィルタにより、周波数２倍された前記
の信号成分から残留する高および低周波成分を除去する
ようになっていることを特徴とする周波数２倍兼混合回
路。10. The frequency doubling / mixing circuit according to claim 4, wherein the frequency doubling / mixing circuit has a narrow band filter coupled to an output terminal of the frequency doubling means. A frequency doubling / mixing circuit, wherein residual high and low frequency components are removed from the signal component whose frequency is doubled by a bandpass filter.
回路において、前記の狭帯域フィルタが１００〜２００
Ｈｚの通過帯域を有していることを特徴とする周波数２
倍兼混合回路。11. The frequency doubling / mixing circuit according to claim 10, wherein said narrow band filter is 100-200.
Frequency 2 characterized by having a pass band of Hz
Double and mixed circuit.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US80535691A | 1991-12-09 | 1991-12-09 | |
| US07/805356 | 1991-12-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05328481A true JPH05328481A (en) | 1993-12-10 |
Family
ID=25191353
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4326729A Pending JPH05328481A (en) | 1991-12-09 | 1992-12-07 | Frequency doubling and mixing circuit |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0546619B1 (en) |
| JP (1) | JPH05328481A (en) |
| DE (1) | DE69227091T2 (en) |
Families Citing this family (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0746083A (en) * | 1993-07-27 | 1995-02-14 | Toshiba Corp | Sound synthesizing and band limiting circuit and low-frequency sound reinforcing circuit |
| JPH08237800A (en) * | 1995-02-27 | 1996-09-13 | Matsushita Electric Ind Co Ltd | Low tone intensifying circuit |
| TW343417B (en) * | 1996-05-08 | 1998-10-21 | Philips Eloctronics N V | Circuit, audio system and method for processing signals, and a harmonics generator |
| FI105522B (en) | 1996-08-06 | 2000-08-31 | Sample Rate Systems Oy | Arrangement for home theater or other audio equipment |
| US5930373A (en) * | 1997-04-04 | 1999-07-27 | K.S. Waves Ltd. | Method and system for enhancing quality of sound signal |
| US6792119B1 (en) | 1997-05-05 | 2004-09-14 | Koninklijke Philips Electronics N.V. | Audio system |
| WO1999025150A1 (en) | 1997-11-07 | 1999-05-20 | Koninklijke Philips Electronics N.V. | Audio system comprising audio signal processing circuit |
| DE69825422T2 (en) * | 1997-11-07 | 2005-07-21 | Koninklijke Philips Electronics N.V. | AUDIO SYSTEM WITH SOUND SIGNAL PROCESSING SWITCHING |
| AU1072099A (en) * | 1997-11-17 | 1999-06-07 | Srs Labs, Inc | Low-frequency audio simulation system |
| US6285767B1 (en) | 1998-09-04 | 2001-09-04 | Srs Labs, Inc. | Low-frequency audio enhancement system |
| DE69919506T3 (en) * | 1998-09-08 | 2008-06-19 | Koninklijke Philips Electronics N.V. | MEANS OF IMPRESSING THE BASS FREQUENCY IN AN AUDIO SYSTEM |
| CN1296722A (en) * | 1999-03-24 | 2001-05-23 | 皇家菲利浦电子有限公司 | Band stop filter |
| US7031474B1 (en) | 1999-10-04 | 2006-04-18 | Srs Labs, Inc. | Acoustic correction apparatus |
| US7277767B2 (en) | 1999-12-10 | 2007-10-02 | Srs Labs, Inc. | System and method for enhanced streaming audio |
| DE60106680T2 (en) | 2000-05-30 | 2006-02-09 | Yamaha Corp., Hamamatsu | Waveform signal generation with synthesizing of pseudo-deep tones |
| EP1428411B2 (en) | 2001-09-21 | 2011-11-30 | Gigaset Communications GmbH | Method and device for controlling the bass reproduction of audio signals in electroacoustic transducers |
| US7474752B2 (en) * | 2003-09-16 | 2009-01-06 | Koninklijke Philips Electronics N.V. | Audio frequency range adaptation |
| US8050434B1 (en) | 2006-12-21 | 2011-11-01 | Srs Labs, Inc. | Multi-channel audio enhancement system |
| PL2798737T3 (en) | 2011-12-27 | 2019-05-31 | Dts Inc | Bass enhancement system |
| WO2014190140A1 (en) | 2013-05-23 | 2014-11-27 | Alan Kraemer | Headphone audio enhancement system |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS518551B1 (en) * | 1970-07-09 | 1976-03-17 | ||
| GB2153187A (en) * | 1984-01-20 | 1985-08-14 | Linn Prod Ltd | A method of processing audio information |
| US4607381A (en) * | 1984-10-05 | 1986-08-19 | Sony Corporation | Signal mixing circuit |
| JPS61248602A (en) * | 1985-04-26 | 1986-11-05 | Toshiba Corp | Frequency doubler |
-
1992
- 1992-12-03 DE DE1992627091 patent/DE69227091T2/en not_active Expired - Fee Related
- 1992-12-03 EP EP19920203748 patent/EP0546619B1/en not_active Expired - Lifetime
- 1992-12-07 JP JP4326729A patent/JPH05328481A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE69227091D1 (en) | 1998-10-29 |
| EP0546619A2 (en) | 1993-06-16 |
| EP0546619B1 (en) | 1998-09-23 |
| EP0546619A3 (en) | 1994-04-20 |
| DE69227091T2 (en) | 1999-05-20 |
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