JPH0644698B2 - Audio equipment - Google Patents

Audio equipment

Info

Publication number
JPH0644698B2
JPH0644698B2 JP13517184A JP13517184A JPH0644698B2 JP H0644698 B2 JPH0644698 B2 JP H0644698B2 JP 13517184 A JP13517184 A JP 13517184A JP 13517184 A JP13517184 A JP 13517184A JP H0644698 B2 JPH0644698 B2 JP H0644698B2
Authority
JP
Japan
Prior art keywords
dynamic range
level
noise
tone signal
output
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.)
Expired - Fee Related
Application number
JP13517184A
Other languages
Japanese (ja)
Other versions
JPS6115408A (en
Inventor
純一 笠井
ひろし 今井
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.)
Nissan Motor Co Ltd
Original Assignee
Nissan Motor Co Ltd
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 Nissan Motor Co Ltd filed Critical Nissan Motor Co Ltd
Priority to JP13517184A priority Critical patent/JPH0644698B2/en
Priority to US06/688,992 priority patent/US4641344A/en
Publication of JPS6115408A publication Critical patent/JPS6115408A/en
Publication of JPH0644698B2 publication Critical patent/JPH0644698B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03GCONTROL OF AMPLIFICATION
    • H03G5/00Tone control or bandwidth control in amplifiers
    • H03G5/16Automatic control
    • H03G5/165Equalizers; Volume or gain control in limited frequency bands
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03GCONTROL OF AMPLIFICATION
    • H03G3/00Gain control in amplifiers or frequency changers
    • H03G3/20Automatic control
    • H03G3/30Automatic control in amplifiers having semiconductor devices
    • H03G3/3005Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03GCONTROL OF AMPLIFICATION
    • H03G3/00Gain control in amplifiers or frequency changers
    • H03G3/20Automatic control
    • H03G3/30Automatic control in amplifiers having semiconductor devices
    • H03G3/32Automatic control in amplifiers having semiconductor devices the control being dependent upon ambient noise level or sound level

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)

Description

【発明の詳細な説明】 (技術分野) 本発明は放送を受信するチユーナー、カセツト磁気テー
プを媒体として楽音信号を録音及び再生するカセツトデ
ツキ等を具え、これら信号ソースからの入力信号を制御
し増幅してスピーカーより音響として出力する音響装置
に関するものである。
Description: TECHNICAL FIELD The present invention comprises a tuner for receiving broadcasting, a cassette deck for recording and reproducing a musical tone signal using a cassette magnetic tape as a medium, and controls and amplifies an input signal from these signal sources. The present invention relates to a sound device that outputs sound from a speaker.

(従来技術) 周囲に騒音が発生する場所において再生音響を聴取しよ
うとすると、騒音レベルの上昇により、該騒音で再生音
響が遮られてしまう場合がある。
(Prior Art) When trying to listen to reproduced sound in a place where noise is generated in the surroundings, the reproduced sound may be interrupted by the noise due to an increase in noise level.

一例をあげると、カーステレオにおいて、自動車の停車
時に出力音量を適切に調整しておいても、走行時に車室
内騒音レベルの上昇により再生音響が聴き取りづらくな
ることがある。
As an example, in a car stereo, even if the output volume is appropriately adjusted when the automobile is stopped, the reproduced sound may be difficult to hear due to an increase in the noise level inside the vehicle during traveling.

このような問題を解決する音響装置としては従来、昭和
55年9月日産自動車株式会社発行のサービス周報第4
28号(LP−1)中第270頁及び第271頁に記載
された如きものがある。この音響装置は周囲の騒音レベ
ルを検出すると共にフアンスイツチの切換え位置を判別
し、これらに応じて増幅器の出力信号レベルを自動的に
変化させる自動音量制御回路を設け、周囲の騒音レベル
が上昇した場合でも、該回路によつて再生音響を聴き取
り易くすることを狙つたものである。
As an audio device that solves such a problem, conventionally, Service Weekly Report No. 4 issued by Nissan Motor Co., Ltd., September 1980.
28 (LP-1), pages 270 and 271. This audio system detects the ambient noise level, determines the switching position of the fan switch, and installs an automatic volume control circuit that automatically changes the output signal level of the amplifier according to these, increasing the ambient noise level. Even in such a case, the purpose of the circuit is to make it easier to hear the reproduced sound.

しかし、かかる従来の音響装置では、騒音レベルに応じ
て出力音響レベルを変化させているのみであるため、騒
音により聴き取りづらくなる周波数帯域のみならず聴き
とりやすい周波数帯域の出力音響も増加させてしまつ
て、全体として音量が大きくなりすぎるという問題を生
じていた。
However, in such a conventional audio device, since the output sound level is only changed according to the noise level, it is possible to increase the output sound not only in the frequency band that is difficult to hear due to noise but also in the frequency band that is easy to hear. Therefore, there was a problem that the volume became too loud as a whole.

(発明の目的) 本発明は前記従来の音響装置の実情に鑑み、周囲の騒音
レベルが上昇し出力音響レベルが相対的に低下すると、
騒音レベルの上昇に応じて、聴き取りづらくなる周波数
帯域の楽音信号のダイナミツクレンジを入力レベルが低
い時程出力レベルが高くなるようにすること等の制御手
段を用いることで上述の問題を解決する音響装置を提供
しようとするものである。
(Object of the Invention) In view of the actual situation of the conventional audio device, the present invention is such that when the ambient noise level rises and the output sound level relatively decreases,
The above problem is solved by using control means such as increasing the output level of the dynamic range of the musical tone signal in the frequency band that becomes difficult to hear as the noise level increases so that the output level becomes higher when the input level is lower. The present invention is intended to provide an audio device that does.

(発明の構成) この目的のため本発明は、前記音響装置において、前記
楽音信号を複数の周波数帯域の成分に分割する楽音信号
分割手段と、周囲の騒音レベルを検出する騒音レベル検
出手段と、前記各周波数帯域毎に独立して設けられ、そ
の周波数帯域の楽音信号レベルが低い時程増幅度を高め
ることによりその楽音信号のダイナミックレンジを狭め
るとともに、その狭める程度を変更し得る複数のダイナ
ミックレンジ変更手段と、前記ダイナミックレンジ変更
手段がダイナミックレンジを狭める程度を、前記騒音レ
ベルの上昇に応じて、かつ前記各ダイナミックレンジ変
更手段毎に独立して増大させるダイナミックレンジ変更
度制御手段と、を具備することを特徴とするものであ
る。
(Structure of the invention) For this purpose, the present invention is, in the audio device, a musical tone signal dividing means for dividing the musical tone signal into a plurality of frequency band components, and a noise level detecting means for detecting a surrounding noise level, A plurality of dynamic ranges that are provided independently for each frequency band, narrow the dynamic range of the musical tone signal by increasing the amplification degree when the musical tone signal level in the frequency band is low, and change the degree of narrowing. Changing means and dynamic range changing degree control means for increasing the extent to which the dynamic range changing means narrows the dynamic range in accordance with the increase in the noise level and independently for each of the dynamic range changing means. It is characterized by doing.

(実施例) 以下、本発明の実施例を図面に基づき詳細に説明する。(Example) Hereinafter, the Example of this invention is described in detail based on drawing.

一般に、音響レベルが低い場合には低音域と高音域との
音響が聴き取りづらくなるという事が知られており、第
1図はこの点に着目して前記の目的を達するよう構成し
た本発明音響装置の一実施態様をブロツク線図にて示す
ものである。
It is generally known that when the sound level is low, it is difficult to hear sounds in the low range and the high range, and FIG. 1 shows the present invention configured to achieve the above-mentioned purpose by paying attention to this point. 1 is a block diagram showing an embodiment of an audio device.

カセツト磁気テープを記録媒体として楽音信号を録音及
び再生するカセツトデツキ1の出力端子と、放送を受信
するチユーナー2の出力端子とはプリアンプ3の入力端
子にそれぞれ接続し、プリアンプ3の出力端子は楽音信
号分割手段としてのチャンネルデイバイダー4の入力端
子に接続する。なお、このチヤンネルデイバイダー4
は、例えばクロスオーバー周波数を500Hzと5kHzと
にとつて通過周波数帯域を500Hz以下、500Hzを越
え5kHz未満、5kHz以上の3つに分割する3チヤンネル
デイバイダーとする。またチヤンネルデイバイダー4の
500Hz以下、500Hzを越え5kHz未満、5kHz以上の
3つの出力端子は夫々ダイナミックレンジ変更手段とし
てのダイナミックレンジコントローラー5,6,7の楽
音信号入力端子に接続し、これらダイナミツクレンジコ
ントローラー5,6,7は夫々に、入力信号が高レベル
な時出力レベルを一定とし、入力信号が低レベルな時出
力レベルを後述する制御信号レベルに応じ可変として出
力信号のダイナミツクレンジを制御するものとする。
The output terminal of the cassette deck 1 for recording and reproducing the tone signal using the cassette magnetic tape as the recording medium and the output terminal of the tuner 2 for receiving the broadcast are respectively connected to the input terminals of the preamplifier 3, and the output terminal of the preamplifier 3 is the tone signal. It is connected to the input terminal of the channel divider 4 as a dividing means. In addition, this channel divider 4
Is a three-channel divider that divides a pass frequency band into 500 Hz or less and 500 Hz or more, less than 5 kHz and less than 5 kHz and 5 kHz or more, for example, with crossover frequencies of 500 Hz and 5 kHz. Also, the three output terminals of the channel divider 4 of 500 Hz or less, more than 500 Hz and less than 5 kHz, and 5 kHz or more are connected to the tone signal input terminals of the dynamic range controllers 5, 6 and 7 as the dynamic range changing means, respectively, and these dynamics are connected. The range controllers 5, 6 and 7 keep the output level constant when the input signal is at a high level and change the output level when the input signal is at a low level in accordance with the control signal level described later to control the dynamic range of the output signal. Shall be controlled.

マイク8は、そのマイク8とともに騒音レベル検出手段
を構成する騒音検出回路9の入力端子に接続し、騒音検
出回路9の出力端子は制御信号発生回路10の入力端子
に接続する。制御信号発生回路10と乗算回路11,12,13
とはダイナミックレンジ変更度制御手段に相当し、制御
信号発生回路10の出力端子はこれからの信号に定数a,
b,cをそれぞれ乗算して出力する乗算回路11,1
2,13の入力端子に夫々接続し、乗算回路11,1
2,13の出力端子は夫々対応するダイナミツクレンジ
コントローラー5,6,7の制御信号入力端子に接続す
る。
The microphone 8 is connected to the input terminal of a noise detection circuit 9 that constitutes noise level detection means together with the microphone 8, and the output terminal of the noise detection circuit 9 is connected to the input terminal of the control signal generation circuit 10. Control signal generation circuit 10 and multiplication circuits 11, 12, 13
Is equivalent to the dynamic range change degree control means, and the output terminal of the control signal generation circuit 10 uses the constant a,
Multiplier circuits 11 and 1 for multiplying and outputting b and c, respectively
2 and 13 are respectively connected to the input terminals of the multiplication circuits 11 and 1
The output terminals of 2 and 13 are connected to the control signal input terminals of the corresponding dynamic range controllers 5, 6 and 7, respectively.

さらに、ダイナミツクレンジコントローラー5,6,7
の出力端子はこれらからの3種の信号を混合するミキサ
ー14の入力端子に夫々接続し、ミキサー14の出力端
子はボリユーム15を介してメインアンプ16の入力端
子に接続すると共に、メインアンプ16の出力端子はス
ピーカー17に接続する。
In addition, the dynamic range controller 5, 6, 7
The output terminals of are connected to the input terminals of the mixer 14 that mixes the three types of signals from them, and the output terminals of the mixer 14 are connected to the input terminals of the main amplifier 16 via the volume 15 and The output terminal is connected to the speaker 17.

上記実施例の作用を次に説明すると、カセツトデツキ1
及びチユーナー2からの楽音信号は、プリアンプ3でど
ちらか一方を選択すると共にこれを増幅し、チヤンネル
デイバイダー4で500Hz以下、500Hzを越え5kHz
未満、5kHz以上の3種の周波数帯域別信号として出力
し、夫々ダイナミツクレンジコントローラー5,6,7
に入力する。ダイナミツクレンジコントローラー5,
6,7よりの周波数帯域別信号はミキサー14で再び混
合し、ボリユーム15を通してレベル調整した後メイン
アンプ16で増幅し、スピーカー17より音響として再
生出力する。
The operation of the above embodiment will be described below.
And, the tone signal from the tuner 2 is selected by the preamplifier 3 and is amplified, and the channel divider 4 is 500Hz or less, 500Hz or more and 5kHz.
Less than 5kHz and output as 3 types of frequency band signals, respectively, dynamic range controller 5, 6, 7
To enter. Dynamic range controller 5,
The frequency band signals from 6 and 7 are mixed again in the mixer 14, adjusted in level through the volume 15, amplified by the main amplifier 16, and reproduced and output as sound from the speaker 17.

周囲の騒音レベルが上昇すると、マイク8は騒音信号を
騒音検出回路9に送り、騒音検出回路9は制御信号発生
回路10を駆動して騒音信号レベルに応じた音響制御信
号を発生させる。該音響制御信号は乗算回路11,1
2,13に夫々入力し、乗算回路11でaを乗算してダ
イナミツクレンジコントローラー5に与えると共に、乗
算回路12でbを乗算してダイナミツクレンジコントロ
ーラー6に与え、また乗算回路13でcを乗算してダイ
ナミツクレンジコントローラー7に与える。ここで例え
ばa=3,b=1,c=2と設定すると、ダイナミツク
レンジコントローラー5,6,7は第2図の作動特性図
(a),(b),(c)にて夫々示すように、騒音信号
レベルが低い時には実線で示すような入出力特性をもつ
て出力レベルを決定し、騒音信号レベルの上昇に応じ破
線で示すような特性をもつて出力レベルを決定する。従
つて騒音信号レベルの上昇に応じダイナミツクレンジコ
ントローラー5〜7は夫々に、小入力時の増幅度を高く
した特性に近づける。
When the ambient noise level rises, the microphone 8 sends a noise signal to the noise detection circuit 9, and the noise detection circuit 9 drives the control signal generation circuit 10 to generate an acoustic control signal according to the noise signal level. The acoustic control signal is applied to the multiplication circuits 11, 1
2 and 13 are input respectively, and the multiplication circuit 11 multiplies them by a to give them to the dynamic range controller 5, while the multiplication circuit 12 multiplies them by b to give them to the dynamic range controller 6, and the multiplication circuit 13 gives c. The result is multiplied and given to the dynamic range controller 7. If, for example, a = 3, b = 1, c = 2 are set, the dynamic range controllers 5, 6, 7 are shown in the operating characteristic diagrams (a), (b), (c) of FIG. 2, respectively. As described above, when the noise signal level is low, the output level is determined with the input / output characteristic shown by the solid line, and the output level is determined with the characteristic shown by the broken line according to the rise of the noise signal level. Therefore, as the noise signal level rises, each of the dynamic range controllers 5 to 7 approaches a characteristic in which the degree of amplification at the time of a small input is increased.

従つて上記第1の実施例における音響装置は、第3図の
周波数−出力レベル特性図中楽音信号レベルが高い場合
を(d)、低い場合を(e)として示すように、周囲の
騒音レベルが低い時は楽音信号レベルによらず出力音響
の周波数特性を実線で表すごとく平坦とし、周囲の騒音
レベルが上昇し出力音響レベルが相対的に低下すると出
力音響の周波数特性を破線で表すように低音部と高音部
とを上昇させたものにする。又、楽音信号レベルが低い
程、前記低音部と高音部との出力音響レベルの上昇率を
高いものとすることができる。
Therefore, the audio device according to the first embodiment has a noise level of the surroundings as shown in the frequency-output level characteristic diagram of FIG. 3 when the tone signal level is high (d) and when it is low (e). When the noise level is low, the frequency characteristic of the output sound is flat as shown by the solid line regardless of the tone signal level, and when the surrounding noise level rises and the output sound level relatively decreases, the frequency characteristic of the output sound is shown by the broken line. The bass and treble are raised. Further, the lower the tone signal level, the higher the rate of increase in the output sound level of the bass portion and the treble portion.

第4図は本発明の他の実施態様を示したブロツク線図
で、図中第1図におけると同様の部分を同一符号にて示
す。
FIG. 4 is a block diagram showing another embodiment of the present invention, in which the same parts as in FIG. 1 are designated by the same reference numerals.

本実施例では、周囲の騒音の周波数に相当する周波数の
再生音響は遮られて聴き取りづらくなるという点に着目
して、前記の目的を達するように構成したものである。
これがため本例では、ダイナミックレンジ変更度制御手
段として、前記第1の実施例における制御信号発生回路
10と乗算回路11〜13とに替えて、チヤンネルデイ
バイダー4のクロスオーバー周波数に相当する周波数で
分割するチヤンネルデイバイダー18と、チヤンネルデ
イバイダー18より出力する3種の騒音信号の信号レベ
ルに応じ音響制御信号を夫々発生させる制御信号発生回
路19〜21とを設け、これらを騒音検出回路9とダイ
ナミツクレンジコントローラー5〜7との間に介挿す
る。
In the present embodiment, the above-described object is achieved by focusing on the point that reproduced sound of a frequency corresponding to the frequency of ambient noise is blocked and becomes difficult to hear.
Therefore, in this example, as the dynamic range change degree control means, the control signal generation circuit 10 and the multiplication circuits 11 to 13 in the first embodiment are replaced by a frequency corresponding to the crossover frequency of the channel divider 4. The channel divider 18 to be divided and the control signal generating circuits 19 to 21 for respectively generating the acoustic control signals according to the signal levels of the three types of noise signals output from the channel divider 18 are provided, and these are designated as the noise detection circuit 9. It is inserted between the dynamic range controllers 5 and 7.

従つて、騒音検出回路9はマイク8からの騒音信号に応
じてチヤンネルデイバイダー18を介し制御信号発生回
路19,20,21を駆動し、チヤンネルデイバイダー
4にて分割した3種の楽音信号の周波数帯域に相当する
音響制御信号を発生させる。従つて、ダイナミツクレン
ジコントローラー5,6,7は、楽音信号のうち周囲の
騒音に遮られて聴き取りづらくなる周波数帯域の信号の
みダイナミツクレンジを狭めることとなり、楽音信号レ
ベルが低い程出力音響レベルの上昇率を高いものとする
ことができる。
Therefore, the noise detection circuit 9 drives the control signal generation circuits 19, 20, and 21 via the channel divider 18 in response to the noise signal from the microphone 8, and the three kinds of musical tone signals divided by the channel divider 4 are generated. An acoustic control signal corresponding to the frequency band is generated. Therefore, the dynamic range controllers 5, 6 and 7 narrow the dynamic range of only the signals in the frequency band of the musical sound signal that are difficult to hear because they are blocked by the surrounding noises. The rate of increase of the level can be high.

(発明の効果) かくして本発明音響装置は、騒音レベル検出手段が検出
した騒音レベルに基づきダイナミックレンジ変更度制御
手段が、ダイナミックレンジ変更手段がダイナミックレ
ンジを狭める程度をその騒音レベルの上昇に応じて、か
つ各ダイナミックレンジ変更手段毎に独立して増大させ
るように構成したので、周囲の騒音レベルが上昇し、出
力音響レベルが相対的に低下した場合に、騒音により聴
き取りづらくなる周波数帯域に特に重点をおいて、楽音
信号レベルが低い時程出力レベルが高くなるようにダイ
ナミックレンジを狭める程度を、その騒音レベルの上昇
に応じて増大させることができ、従って、騒音により聴
き取りづらくなる周波数帯域の出力音響を、楽音信号レ
ベルが低い時程、騒音レベルの上昇に応じて自然な感じ
で増加させることができ、それゆえ、全体の音量を大き
くし過ぎずに、しかも自然な感じで、出力音響を聴き取
り易くすることができる。
(Effects of the Invention) Thus, in the audio device of the present invention, the dynamic range changing degree control means determines the extent to which the dynamic range changing means narrows the dynamic range based on the noise level detected by the noise level detecting means in accordance with the increase in the noise level. Moreover, since the dynamic range changing means is configured to increase independently, it is particularly suitable for a frequency band that is difficult to hear due to noise when the surrounding noise level rises and the output sound level relatively decreases. With emphasis, the degree to which the dynamic range is narrowed so that the output level becomes higher when the tone signal level is lower can be increased in accordance with the increase in the noise level, so that the frequency band becomes difficult to hear due to noise. The output sound of the is as natural as the noise level rises when the tone signal level is low. Therefore, it is possible to make the output sound easier to hear without increasing the overall volume too much and with a natural feeling.

(実施例の効果) また、第4図にて示す他の実施例のように構成すれば、
騒音により遮られる周波数帯域に限つてダイナミツクレ
ンジを狭めるので、前記第1の実施例の効果を聴感上さ
らに自然に得ることができる。
(Effects of Embodiment) Further, if configured as in another embodiment shown in FIG. 4,
Since the dynamic range is narrowed only to the frequency band blocked by noise, the effects of the first embodiment can be more naturally heard.

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

第1図は本発明音響装置の第1実施例を示すブロツク線
図、 第2図は同装置のダイナミツクレンジコントローラーの
作動特性図、 第3図は同装置の周波数−出力特性図、 第4図は本発明の他の実施例を示すブロツク線図であ
る。 1……カセツトデツキ、2……チユーナー 3……プリアンプ、4……チヤンネルデイバイダー 5,6,7……ダイナミツクレンジコントローラー 8……マイク、9……騒音検出回路 10……制御信号発生回路、11,12,13……乗算回路 14……ミキサー、15……ボリユーム 16……メインアンプ、17……スピーカー 18……チヤンネルデイバイダー、19,20,21……制御信号
発生回路。
FIG. 1 is a block diagram showing a first embodiment of an audio device of the present invention, FIG. 2 is an operation characteristic diagram of a dynamic range controller of the same device, FIG. 3 is a frequency-output characteristic diagram of the device, and FIG. The figure is a block diagram showing another embodiment of the present invention. 1 ... Cassette deck, 2 ... tuner 3 ... preamplifier, 4 ... channel divider 5, 6, 7 ... dynamic range controller 8 ... microphone, 9 ... noise detection circuit 10 ... control signal generation circuit, 11,12,13 …… Multiplier circuit 14 …… Mixer, 15 …… Volume 16 …… Main amplifier, 17 …… Speaker 18 …… Channel divider, 19,20,21 …… Control signal generation circuit.

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】楽音信号を音響として再生可能な音響装置
において、 前記楽音信号を複数の周波数帯域の成分に分割する楽音
信号分割手段と、 周囲の騒音レベルを検出する騒音レベル検出手段と、 前記各周波数帯域毎に独立して設けられ、その周波数帯
域の楽音信号レベルが低い時程増幅度を高めることによ
りその楽音信号のダイナミックレンジを狭めるととも
に、その狭める程度を変更し得る複数のダイナミックレ
ンジ変更手段と、 前記ダイナミックレンジ変更手段がダイナミックレンジ
を狭める程度を、前記騒音レベルの上昇に応じて、かつ
前記各ダイナミックレンジ変更手段毎に独立して増大さ
せるダイナミックレンジ変更度制御手段と、 を具えることを特徴とする、音響装置。
1. A sound device capable of reproducing a tone signal as a sound, comprising: a tone signal dividing unit for dividing the tone signal into a plurality of frequency band components; and a noise level detecting unit for detecting a noise level in the surroundings. Multiple dynamic range changes that are provided independently for each frequency band and narrow the dynamic range of the tone signal by increasing the amplification degree when the tone signal level in that frequency band is low, and can change the degree of narrowing Means and a dynamic range change degree control means for increasing the degree to which the dynamic range change means narrows the dynamic range in response to the increase in the noise level and independently for each of the dynamic range change means. An acoustic device characterized by the above.
JP13517184A 1984-01-06 1984-07-02 Audio equipment Expired - Fee Related JPH0644698B2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP13517184A JPH0644698B2 (en) 1984-07-02 1984-07-02 Audio equipment
US06/688,992 US4641344A (en) 1984-01-06 1985-01-04 Audio equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13517184A JPH0644698B2 (en) 1984-07-02 1984-07-02 Audio equipment

Publications (2)

Publication Number Publication Date
JPS6115408A JPS6115408A (en) 1986-01-23
JPH0644698B2 true JPH0644698B2 (en) 1994-06-08

Family

ID=15145492

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13517184A Expired - Fee Related JPH0644698B2 (en) 1984-01-06 1984-07-02 Audio equipment

Country Status (1)

Country Link
JP (1) JPH0644698B2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6383897U (en) * 1986-11-20 1988-06-01
JPH0216610U (en) * 1988-07-20 1990-02-02

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52149054A (en) * 1976-06-02 1977-12-10 Furitsuke Yobusuto Sound regenerative system
JPS607848B2 (en) * 1978-08-23 1985-02-27 松下電器産業株式会社 automatic volume adjustment device

Also Published As

Publication number Publication date
JPS6115408A (en) 1986-01-23

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