JPH0417408A - Double-bass sound reproducing device - Google Patents
Double-bass sound reproducing deviceInfo
- Publication number
- JPH0417408A JPH0417408A JP2121572A JP12157290A JPH0417408A JP H0417408 A JPH0417408 A JP H0417408A JP 2121572 A JP2121572 A JP 2121572A JP 12157290 A JP12157290 A JP 12157290A JP H0417408 A JPH0417408 A JP H0417408A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- output
- amplifier
- input
- inputted
- 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
- 230000003321 amplification Effects 0.000 claims abstract description 25
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 25
- 238000001514 detection method Methods 0.000 claims abstract description 5
- 238000010586 diagram Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 3
- FGRBYDKOBBBPOI-UHFFFAOYSA-N 10,10-dioxo-2-[4-(N-phenylanilino)phenyl]thioxanthen-9-one Chemical group O=C1c2ccccc2S(=O)(=O)c2ccc(cc12)-c1ccc(cc1)N(c1ccccc1)c1ccccc1 FGRBYDKOBBBPOI-UHFFFAOYSA-N 0.000 description 1
- 101100381996 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) BRO1 gene Proteins 0.000 description 1
- PHEDXBVPIONUQT-RGYGYFBISA-N phorbol 13-acetate 12-myristate Chemical compound C([C@]1(O)C(=O)C(C)=C[C@H]1[C@@]1(O)[C@H](C)[C@H]2OC(=O)CCCCCCCCCCCCC)C(CO)=C[C@H]1[C@H]1[C@]2(OC(C)=O)C1(C)C PHEDXBVPIONUQT-RGYGYFBISA-N 0.000 description 1
Landscapes
- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、特にビデオテープレコーダ（ＶＴＲ）やステ
レオ音響再生装置等のオーデオ・ビデオ機器の低音再生
能を向上させる重低音再生装置に関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a deep bass reproduction device that improves the bass reproduction capability of audio/video equipment, particularly video tape recorders (VTRs) and stereo sound reproduction devices.
従来の技術
近年、デジタルソーヌの普及、モニタ画面の大型化に伴
い、重低音の再生が注目されている。以下、従来の重低
音再生装置について図面を参照しながらその構成と動作
を説明する。BACKGROUND OF THE INVENTION In recent years, with the spread of digital Saone and the increase in the size of monitor screens, the reproduction of deep bass has been attracting attention. Hereinafter, the configuration and operation of a conventional heavy bass reproduction device will be explained with reference to the drawings.
第４図において、入力端子１に加えられたＶＴＲまたは
テープデツキ等の再生装置の出力信号Ｓ１は、２分岐す
る手段８によシ２２分岐れ、分岐された第１の信号Ｓ３
はローパヌフィルタ（以下ＬＰＦと略称する）ＬＰＦ２
、増幅器３で処理され、加算器５で入力信号Ｓ１を２分
岐した第２の信号Ｓ２と加算され増幅器６により電力増
幅されてスピーカ了から出力されるようになっている。In FIG. 4, an output signal S1 from a reproducing device such as a VTR or a tape deck, which is applied to an input terminal 1, is branched into two by a means 8 for splitting into two, and the output signal S1 is branched into a first signal S3.
is a low-panu filter (hereinafter abbreviated as LPF) LPF2
, processed by an amplifier 3, added to a second signal S2 obtained by branching the input signal S1 into two by an adder 5, power-amplified by an amplifier 6, and outputted from a speaker.
第５図は、第４図に示す従来例のＬＰＦ２と増幅器３の
入力信号Ｓ１に対する出力レベルの入出力特性である。FIG. 5 shows the input/output characteristics of the output level of the conventional LPF 2 and amplifier 3 shown in FIG. 4 with respect to the input signal S1.
発明が解決しようとする課題
しかしながら上記のような従来の構成では、ＬＰＦの低
音成分には雑音も含まれており、それを単に増幅するだ
けでは、雑音成分も増幅することになシ、特に、微少信
号レベルでは雑音増大によシ、音楽信号の高音質をそこ
なうという問題点がクローズアップされていた。Problems to be Solved by the Invention However, in the conventional configuration as described above, the low frequency component of the LPF includes noise, and simply amplifying it does not amplify the noise component. At the minute signal level, the problem of increasing noise and impairing the high sound quality of the music signal has been highlighted.
本発明は、上記課題を解決するため、あらゆるソースに
対して雑音の少ない、臨場感ある重低音再生装置を提供
することを目的とするものである。SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, it is an object of the present invention to provide a deep bass reproduction device with less noise and a sense of realism for all sources.
課題を解決するための手段
上記目的を達成するため、本発明は、入力端子に入力さ
れた信号を２分岐する分岐手段と、前記分岐手段によシ
分岐された第１の信号を入力とし、かつ第１の信号の低
音域成分だけを通過させるＬＰＦと、前記ＬＰＦの出力
を入力として、検波回路と前記検波回路の動作状態の変
化によって増幅率の変化する増幅回路とよりなる可変増
幅手段と、前記分岐手段により分岐された第２の信号と
、前記可変増幅手段の出力信号を加算した信号を出力と
するか、または前記分岐された第２の信号と前記可変増
幅手段の出力信号とを個別に出力する手段を備えた構成
となっている。Means for Solving the Problems In order to achieve the above object, the present invention provides a branching means for branching a signal input to an input terminal into two, a first signal branched by the branching means as an input, and variable amplification means comprising an LPF that passes only the low frequency component of the first signal, and an amplification circuit that receives the output of the LPF and whose amplification factor changes according to a change in the operating state of a detection circuit and the detection circuit. , the output is a signal obtained by adding the second signal branched by the branching means and the output signal of the variable amplification means, or the branched second signal and the output signal of the variable amplification means are combined. The configuration includes means for individually outputting.
作 用
上記構成において、ＬＰＦと増幅回路を用いた重低音再
生装置の低域出力レベ）Ｖを入力に対して非線的に任意
に可変し、微少信号レベルでの雑音増加を抑圧し、臨場
感ある重低音を再生することとなる。Function: In the above configuration, the low frequency output level (V) of the deep bass reproduction device using the LPF and the amplifier circuit is arbitrarily varied nonlinearly with respect to the input, suppressing the increase in noise at minute signal levels, and It will reproduce deep bass sound.
実施例
以下本発明の一実施例について図を用いてその構成と動
作を説明する。Embodiment Below, the structure and operation of an embodiment of the present invention will be explained with reference to the drawings.
第１図ａに本発明の一実施例の重低音再生装置のブロッ
ク図を示す。図において、入力端子１に入力された信号
Ｓ１は、分岐手段８によシ２２分岐れ、その第２の出力
Ｓ２ば、そのまま加算器５の第１の入力端子に入力され
る。一方、その第１の出力Ｓ３は、低音域を通過させる
フィルタであるＬＰＦ２により低音成分のみの出力信号
Ｓ４に変換される。そして信号Ｓ４は、分岐手段９によ
シ２２分岐れ、その第１の出力Ｓ５は、そのまま増幅器
３の入力端子に入力される。一方、その第２の出力Ｓ６
は検波器４の入力端子に入ツＪされる。FIG. 1a shows a block diagram of a deep bass reproduction device according to an embodiment of the present invention. In the figure, a signal S1 input to an input terminal 1 is branched into 22 branches by a branching means 8, and its second output S2 is inputted as is to a first input terminal of an adder 5. On the other hand, the first output S3 is converted into an output signal S4 containing only bass components by an LPF 2, which is a filter that passes a bass range. The signal S4 is then branched into 22 branches by the branching means 9, and its first output S5 is inputted as is to the input terminal of the amplifier 3. On the other hand, its second output S6
is input to the input terminal of the wave detector 4.
この検波回路４は、その入力信号Ｓ６があらかじめ定め
た第１のしきい値と、あらかじめ定めた第２のしきい値
とを境にその特性が変化し、この検波器４の出力Ｓ７は
、増幅器３の増幅器３の増幅度の制限に関与する端子に
入力される。この可変増幅手段である増幅器３と検波器
４の一実施例を第１図すに示す。図において分岐手段９
で分岐された一方の信号Ｓ はバッファアンプＡ１で増
幅され、ダイオードＤ１．Ｄ２で整流され抵抗Ｒ４とＲ
６で分圧されてトランジスタＱ１のベークに加えられる
。The characteristics of the detector circuit 4 change when the input signal S6 reaches a predetermined first threshold and a predetermined second threshold, and the output S7 of the detector 4 is It is input to a terminal of the amplifier 3 that is involved in limiting the amplification degree of the amplifier 3. An embodiment of an amplifier 3 and a detector 4, which are variable amplification means, is shown in FIG. In the figure, branching means 9
One signal S branched at is amplified by buffer amplifier A1, and is amplified by diode D1. Rectified by D2 and resistors R4 and R
The voltage is divided by 6 and applied to the bake of transistor Q1.
ここで、分岐段９で分岐された信号Ｓ５のレベルが第２
図におけるｖ０〜ｖ１ の間はトランジスタＱ１はカッ
トになるようＲ４，Ｒ５の値を設定すると、増幅器３の
増幅率Ａｖ１は
であり、増幅率は低く、この範囲での低域の出力は抑え
られている。Here, the level of the signal S5 branched at the branching stage 9 is the second level.
If the values of R4 and R5 are set so that the transistor Q1 is cut between v0 and v1 in the figure, the amplification factor Av1 of the amplifier 3 is .The amplification factor is low, and the low frequency output in this range is suppressed. ing.
信号Ｓ のレベルが■１〜ｖ２の間、トランジスタＱ１
にはＩＣが流れ始め、等測的に可変抵抗器ＲＢＥがげ加
されたことになり、このときの増幅器３の増幅率Ａｖ２
ば
とな久信号しベル■１〜ｖ２間の増幅率は高くなりさら
に信号Ｓ５のレベルがｖ２を超えるとトランジスタＱ１
は完全にＯＮ状態となムその時の増幅器３の増幅率Ａｖ
３は
となる。この関係を第２図に示す。図は、増幅器３の入
力レベルと出力レベルの関係を示したものである。入力
レベルがＶ。からｖｌまでの間、増幅器の出力レベルは
ｖｏ。からＶ。１まで変化し増幅率Ａ１は
Ａ１＝ｖｏ１−ｖ００／ｖ１−ｖＯ
ただしＩＶｏｌｌ ＞ ＩＶｏ。ｌ 、 ＩＶｌｌ ＞
ＩＶｏｌである。When the level of the signal S is between ■1 and v2, the transistor Q1
IC begins to flow, and the variable resistor RBE is added isometrically, and the amplification factor Av2 of the amplifier 3 at this time is
When the signal S5 increases, the amplification factor between signal S1 and v2 increases, and when the level of signal S5 exceeds v2, transistor Q1
is the amplification factor Av of amplifier 3 at that time when it is in a completely ON state.
3 becomes . This relationship is shown in FIG. The figure shows the relationship between the input level and output level of the amplifier 3. The input level is V. From vl to vl, the output level of the amplifier is vo. From V. 1, and the amplification factor A1 is A1=vo1-v00/v1-vO where IVoll > IVo. l, IVll>
It is IVol.
また、入力レベルがＶ からｖ２までの間、増幅器３の
出力レベルはＶ からｖ０２まで変化し増幅率Ａ２は
Ａ２＝ｖｏ２−ｖ０１／Ｖ２−ｖま
ただし１ｖ２１〉１ｖ１１，１ｖｏ２１〉１■。１１で
ある。Further, while the input level is from V2 to v2, the output level of the amplifier 3 changes from V2 to v02, and the amplification factor A2 is A2=vo2-v01/V2-v where 1v21>1v11, 1vo21>1■. It is 11.
ここでｌＡ２１＞ｌＡｌ１となるように検波器４は動作
し、入力レベルがｖ２を超えると増幅器３の出力レベル
はＡ と同じあるいは少なくともＡ２よシも小さくなる
よう検波器４は動作する。したがって増幅器３の出力信
号Ｓ８は、ＬＰＦ２の出力信号Ｓ４のレベルが小さくな
る程小さくなシ、その関係を第３図に示す。Here, the detector 4 operates so that lA21>lAl1, and when the input level exceeds v2, the detector 4 operates so that the output level of the amplifier 3 becomes equal to A2 or at least smaller than A2. Therefore, the output signal S8 of the amplifier 3 becomes smaller as the level of the output signal S4 of the LPF 2 becomes smaller. FIG. 3 shows this relationship.
第３図は、本発明が従来の重低音再生装置での低音成分
において微小信号レベルでの問題点を解決しようとする
特徴を表わしている。FIG. 3 shows the feature of the present invention, which attempts to solve the problem of the weak signal level in the bass component in the conventional heavy bass reproduction device.
なお以上の図では入力ｖ１とｖ２の点で折線的に表現し
たが、トランジスタの特性から、たとえばｖ１付近では
対数的に増幅率が高くなっていく。Note that in the diagrams above, inputs v1 and v2 are expressed as a broken line, but due to the characteristics of the transistor, for example, the amplification factor increases logarithmically near v1.
このようにして得られた増幅器３の出力信号Ｓ８は加ｘ
Ｒ５の第２の入力端子に入力され、加算器５によシ加算
された信号Ｓ９となシ、増幅器６により電力増幅されス
ピーカ７から再生される。The output signal S8 of the amplifier 3 obtained in this way is
The signal S9 is inputted to the second input terminal of R5 and added by the adder 5, and the power is amplified by the amplifier 6 and reproduced from the speaker 7.
なお、実施例におけるローバスフィルタの定義には低域
のある部分を選択的に通過させるバンドパスフィルタ（
ＢＰＦ）を用いることも含むものである。Note that the definition of a low-pass filter in the examples includes a band-pass filter (
BPF).
また、加算器５で第１の信号Ｓ２と第２信号Ｓ３を処理
したＳ８を加算したが、これは加算せせずに信号Ｓ８専
用の増幅器とスピーカを用いて再生してもよいものであ
る。Further, although the adder 5 added the processed first signal S2 and the second signal S3, S8, the signal S8 may be reproduced using an amplifier and a speaker dedicated to the signal S8 without being added.
また検波器４と増幅器３による可変増幅手段も例示のも
のに限定されず、同様の特性を得られるものを用いれば
よいものである。Further, the variable amplification means including the detector 4 and the amplifier 3 are not limited to those shown in the example, but any means that can obtain similar characteristics may be used.
発明の効果
以上の実施例の説明よシ明らかなように、本発明は上記
の構成によって、低音量レベル時には低音域の増幅率を
下げ、低域の雑音を抑え、一定板上の音量になると低音
域の増幅率を急激に上げて低域を増強し、大音量時には
低域の増幅率を下げて増幅器やスピーカの歪を防ぐとい
う効果を有し、また必要により低域増強された信号は別
のスピーカから再生して、スピーカによる混変調を防ぐ
など、あらゆるソースについて臨場感ある重低音再生装
置を実現できるというすぐれた効果を得るものである。As is clear from the explanation of the embodiments above, the present invention lowers the amplification factor in the bass range when the volume level is low, suppresses noise in the low range, and achieves a constant level of volume. It has the effect of rapidly increasing the amplification factor of the bass range to strengthen the low range, and when the volume is high, the amplification factor of the low range is lowered to prevent distortion of the amplifier and speakers. This has the excellent effect of realizing a realistic deep bass reproduction device for any source, such as by playing from another speaker and preventing cross-modulation caused by the speaker.
第１図ａは、本発明の一実施例の重低音再生装置のブロ
ック図、第１図すは同じく可変増幅手段の要部回路図、
第２図は同じくその効果を示す可変増幅手段の入出力特
性図、第３図は入力端子の入力に対するＬＰＦ２と増幅
器３の出力特性図、第４図は従来例のブロック図、第６
図は従来例における入力端子の入力に対するＬＰＦと増
幅器の出力特性図である。
１・・・・・・入力端子、２・・・・・・ＬＰＦ、３．
６・・・・・・増幅器、４・・・・・・検波器、６・・
・・・・加算器、７・・・・・・スピ力、８・・・・・
・分岐手段、Ｓ３・・・・・・第１の信号、Ｓ２・・・
・・・第２の信号。
代理人の氏名 弁理士 粟 野 重 孝 ほか１名第
図
第
賦 −
巳
図
入カレヘ゛ル
２＼υレベル
昧
瞭FIG. 1a is a block diagram of a heavy bass reproduction device according to an embodiment of the present invention, and FIG.
FIG. 2 is an input/output characteristic diagram of the variable amplification means that also shows the effect, FIG. 3 is an output characteristic diagram of the LPF 2 and amplifier 3 with respect to the input terminal input, FIG. 4 is a block diagram of the conventional example, and FIG.
The figure is a diagram showing output characteristics of an LPF and an amplifier with respect to an input terminal in a conventional example. 1...Input terminal, 2...LPF, 3.
6...Amplifier, 4...Detector, 6...
...Adder, 7...Spirit power, 8...
- Branching means, S3...First signal, S2...
...Second signal. Name of agent: Patent attorney Shigetaka Awano and one other person
Claims (2)
、かつ前記第１の信号の低域成分だけを通過させる低域
通過フィルタと、 前記低域通過フィルタの出力を入力とし、入力信号のあ
るしきい値を境に非直線変化する検波回路と、前記低域
通過フィルタの出力を入力とし、前記検波回路の動作状
態によって増幅率の変化する増幅回路とよりなる可変増
幅手段とを有し、前記２分岐されたその第２の信号と前
記可変増幅手段の出力信号とを加算した信号を出力する
重低音再生装置。(1) A low-pass filter that takes as input the first signal obtained by splitting the input signal into two and that passes only the low-frequency components of the first signal; and has the output of the low-pass filter as input; Variable amplification means includes a detection circuit whose signal changes non-linearly with respect to a certain threshold value, and an amplifier circuit which receives the output of the low-pass filter and whose amplification factor changes depending on the operating state of the detection circuit. and outputting a signal obtained by adding the second signal branched into two and the output signal of the variable amplification means.
ることなく個別に出力する請求項１記載の重低音再生装
置。(2) The deep bass reproduction device according to claim 1, wherein the second signal and the output signal of the variable amplification means are output individually without being added together.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12157290A JP2893856B2 (en) | 1990-05-11 | 1990-05-11 | Heavy bass playback device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12157290A JP2893856B2 (en) | 1990-05-11 | 1990-05-11 | Heavy bass playback device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0417408A true JPH0417408A (en) | 1992-01-22 |
| JP2893856B2 JP2893856B2 (en) | 1999-05-24 |
Family
ID=14814555
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12157290A Expired - Fee Related JP2893856B2 (en) | 1990-05-11 | 1990-05-11 | Heavy bass playback device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2893856B2 (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5593311A (en) * | 1979-01-09 | 1980-07-15 | Onkyo Corp | Loudness circuit unit |
| JPS60246111A (en) * | 1984-05-21 | 1985-12-05 | Hitachi Ltd | Speaker driver for single power supply |
| JPS61129270A (en) * | 1984-11-28 | 1986-06-17 | Hitachi Metals Ltd | Automatic pouring device |
| JPS62130407A (en) * | 1985-12-02 | 1987-06-12 | Okuma Mach Works Ltd | Generation method for rough program by digital data |
| JPH01144813A (en) * | 1987-12-01 | 1989-06-07 | Fujitsu Ten Ltd | Automatic auditory sense correction circuit |
-
1990
- 1990-05-11 JP JP12157290A patent/JP2893856B2/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5593311A (en) * | 1979-01-09 | 1980-07-15 | Onkyo Corp | Loudness circuit unit |
| JPS60246111A (en) * | 1984-05-21 | 1985-12-05 | Hitachi Ltd | Speaker driver for single power supply |
| JPS61129270A (en) * | 1984-11-28 | 1986-06-17 | Hitachi Metals Ltd | Automatic pouring device |
| JPS62130407A (en) * | 1985-12-02 | 1987-06-12 | Okuma Mach Works Ltd | Generation method for rough program by digital data |
| JPH01144813A (en) * | 1987-12-01 | 1989-06-07 | Fujitsu Ten Ltd | Automatic auditory sense correction circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2893856B2 (en) | 1999-05-24 |
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