JP2557736Y2 - Audio signal processing equipment - Google Patents
Audio signal processing equipmentInfo
- Publication number
- JP2557736Y2 JP2557736Y2 JP1992008493U JP849392U JP2557736Y2 JP 2557736 Y2 JP2557736 Y2 JP 2557736Y2 JP 1992008493 U JP1992008493 U JP 1992008493U JP 849392 U JP849392 U JP 849392U JP 2557736 Y2 JP2557736 Y2 JP 2557736Y2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- switch
- terminal
- audio 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 - Lifetime
Links
Description
【０００１】[0001]
【産業上の利用分野】本考案は、オーディオ信号処理装
置に関し、特にディジタルオーディオ信号をアナログ信
号に変換して再生するようにしたオーディオ信号処理装
置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an audio signal processing apparatus, and more particularly to an audio signal processing apparatus which converts a digital audio signal into an analog signal and reproduces the signal.
【０００２】[0002]
【従来の技術】図３は、ＣＤ−ＲＯＭ、ＣＤのようなデ
ィジタルオーディオ信号を格納した装置からのオーディ
オ信号を処理する従来の代表的な回路を示しており、同
図において、１１は、ＣＤ−ＲＯＭ、ＣＤのようなディ
スク装置から取り出したディジタルオーディオ信号を右
信号（Ｒ）と左信号（Ｌ）を合成した形にするＬＳＩか
らなる信号処理回路、１２は、この信号処理回路１１に
作用して上述した信号を取り出すのに必要な制御を行う
制御装置（ＣＰＵ）、１３は、入力されるディジタルオ
ーディオ信号を、制御装置１２の制御の下に、アナログ
オーディオ信号に変換するＩＣからなるＤ／Ａコンバー
タ、１４は、このＤ／Ａコンバータ１３でＬ，Ｒ信号に
分けられた信号を濾波する増幅機能を持ったＩＣからな
るローパスフィルタである。そしてこのローパスフィル
タ１４の出力は、ライン出力として後段に送出される。
なお、１５は、エンファシス回路、１６は、独立ミュー
ト回路であり、これらは、制御装置１２の制御の下に、
Ｄ／Ａコンバータ１３から送出されるＬ，Ｒ信号をモデ
ィファイする。１７は、ローパスフィルタ１４の後段に
配置された独立ミュート回路であり、制御装置１２の制
御下に、ローパスフィルタ１４の出力のＬ，Ｒ信号をモ
ディファイする。また１８は、ローパスフィルタの出力
側に接続されたヘッドフォーン回路である。上述した各
構成要素は、通常ＩＣによって構成される。2. Description of the Related Art FIG. 3 shows a conventional typical circuit for processing an audio signal from a device storing a digital audio signal such as a CD-ROM or a CD. In FIG. A signal processing circuit 12 composed of an LSI for synthesizing a right signal (R) and a left signal (L) into a digital audio signal taken out from a disk device such as a ROM or a CD; A control device (CPU) 13 that performs necessary control for extracting the above-described signal is controlled by a D (Digital Signal Processing) IC that converts an input digital audio signal into an analog audio signal under the control of the control device 12. A / A converter 14 is a low-pass filter composed of an IC having an amplifying function for filtering a signal divided into L and R signals by the D / A converter 13. It is. The output of the low-pass filter 14 is sent to the subsequent stage as a line output.
In addition, 15 is an emphasis circuit, 16 is an independent mute circuit, and these are controlled under the control of the controller 12.
The L and R signals sent from the D / A converter 13 are modified. Reference numeral 17 denotes an independent mute circuit arranged downstream of the low-pass filter 14, and modifies the L and R signals output from the low-pass filter 14 under the control of the control device 12. Reference numeral 18 denotes a headphone circuit connected to the output side of the low-pass filter. Each of the above-described components is usually configured by an IC.
【０００３】[0003]
【考案が解決しようとする課題】図３に示されるような
構成では、オーディオ部分を、以下のようなマルチメデ
ィア対応にするために切り換えたいときには、ローパス
フィルタ１４の出力側に機械的な切り換えスイッチを配
置して切り換え制御を行っていた。 （１） ＬＲ独立ミュート（ＬチャンネルあるいはＲチ
ャンネルのみの音声出力） （２） スワップ（ＬチャンネルからＲチャンネルの音
声を、ＲチャンネルからＬチャンネルの音声を出力） （３） ミキシング（モノラル音声を出力） （４） Ｌチャンネルモノラル（Ｌ，Ｒ両チャンネルよ
りＬチャンネルの音声を出力） （５） Ｒチャンネルモノラル（Ｌ，Ｒ両チャンネルよ
りＲチャンネルの音声を出力） （６） Ｌ，Ｒ独立アッテネータ（左右独立に出力レベ
ルを可変する） しかし、上述したようにローパスフィルタの出力側で機
械的な切り換えスイッチによりオーディオ部分のマルチ
メディア対応処理をおこなうとスペースファクタが悪く
なり、装置のコンパクト化の障害となっていた。In the configuration shown in FIG. 3, when it is desired to switch the audio portion so as to be compatible with the following multimedia, a mechanical switch is provided on the output side of the low-pass filter 14. And switching control was performed. (1) LR independent mute (audio output of L channel or R channel only) (2) Swap (output audio of R channel from L channel, audio of L channel from R channel) (3) Mixing (output monaural audio) (4) L-channel monaural (outputs L-channel audio from both L and R channels) (5) R-channel monaural (outputs R-channel audio from both L and R channels) (6) L and R independent attenuators ( However, as described above, if multimedia processing of the audio portion is performed by a mechanical changeover switch on the output side of the low-pass filter as described above, the space factor becomes worse, and the obstacle to the compactness of the device may occur. Had become.
【０００４】[0004]
【課題を解決するための手段】上記目的は、本考案に係
るオーディオ信号処理装置によれば、デジタルオーディ
オ信号をアナログの左信号と右信号に変換するＤ／Ａコ
ンバータと、この出力側に配設されるローパスフィルタ
との間に、該左信号が接続された左信号端子か該右信号
が接続された右信号端子かどちらかの端子を選択し左信
号として出力するための第１のスイッチと、該左信号が
接続された左信号端子か該右信号が接続された右信号端
子かどちらかの端子を選択し右信号として出力するため
の第２のスイッチと、該左信号と該右信号を合わせるた
めの第３のスイッチとからなるアナログスイッチ回路を
配設したことにより達成される。SUMMARY OF THE INVENTION According to the audio signal processing apparatus of the present invention, a D / A converter for converting a digital audio signal into an analog left signal and a right signal, and an output terminal for the D / A converter are provided. A first switch for selecting either a left signal terminal to which the left signal is connected or a right signal terminal to which the right signal is connected and outputting the left signal as a left signal between the low signal and a low-pass filter to be provided; A second switch for selecting either the left signal terminal to which the left signal is connected or the right signal terminal to which the right signal is connected, and outputting the selected signal as a right signal; This is achieved by providing an analog switch circuit including a third switch for matching signals.
【０００５】[0005]
【作用】このように構成することによりマルチメディア
対応のスイッチを電子化できるようにしたものである。With this configuration, the switch for multimedia can be digitized.
【０００６】[0006]
【実施例】図１は、本考案の一実施例であり、図３と同
じものあるいは同じ機能を有するものは同符号を用いて
いる。同図において、図１との相違点は、Ｄ／Ａコンバ
ータ１３とローパスフィルタ１４との間にアナログスイ
ッチ２１を配置した。FIG. 1 shows an embodiment of the present invention, in which the same reference numerals as those in FIG. 3 or those having the same functions are used. 1 differs from FIG. 1 in that an analog switch 21 is arranged between a D / A converter 13 and a low-pass filter 14.
【０００７】図２は、このアナログスイッチ２１の一例
を示しており、上述したマルチメディア対応スイッチ機
能の（６）を除く動作を行うように構成されている。ま
た、このスイッチは、ＩＣ（半導体集積回路）によって
構成することができ、たとえばアナログマルチプレクサ
が用いられる。この図２のアナログスイッチ２１は、左
信号が接続された左信号端子ａ、右信号が接続された右
信号端子ｂと中点位置を夫々有する３個の双投スイッチ
２１ａ、２１ｂ，２１ｃを含み、制御装置１２からの３
つの制御信号の組み合わせによって８通りの組み合わせ
をスイッチ選択できるようになっている。FIG. 2 shows an example of the analog switch 21. The analog switch 21 is configured to perform an operation other than the above-described multimedia-compatible switch function (6). Further, this switch can be constituted by an IC (semiconductor integrated circuit), for example, an analog multiplexer is used. Analog switch 21 in FIG. 2, left
Left signal terminal a to which signal is connected, right to which right signal is connected
It includes three double-throw switches 21a, 21b, and 21c each having a signal terminal b and a midpoint position.
Eight combinations can be switch-selected by a combination of two control signals.
【０００８】この場合、ＩＣで構成されるアナログスイ
ッチ２１は、内部抵抗が大きく、このため、ローパスフ
ィルタ１４の後段に設けると出力インピーダンスが低下
してしまう。これに対して、本考案のようにＤ／Ａコン
バータ１３とローパスフィルタ１４との間にアナログス
イッチを設けると、アナログスイッチ２１のＩＣの内部
抵抗のばらつきを抑えることができ、特性を安定にする
ことができる。In this case, the analog switch 21 formed of an IC has a large internal resistance. Therefore, if the analog switch 21 is provided at a stage subsequent to the low-pass filter 14, the output impedance is reduced. On the other hand, when an analog switch is provided between the D / A converter 13 and the low-pass filter 14 as in the present invention, the variation in the internal resistance of the IC of the analog switch 21 can be suppressed and the characteristics can be stabilized. be able to.
【０００９】[0009]
【考案の効果】以上に述べたように、本考案によるオー
ディオ信号処理装置によれば、オーディオ部分のマルチ
メディア対応処理をおこなう際、装置を電子化すること
ができ、装置を従来よりコンパクトにし、しかも特性を
安定にできる等の効果を奏する。As described above, according to the audio signal processing device of the present invention, when performing the multimedia processing of the audio portion, the device can be digitized, and the device can be made more compact than before. In addition, there is an effect that the characteristics can be stabilized.
【００１０】[0010]
【図１】本考案によるオーディオ信号処理装置の一実施
例を示すブロック図である。FIG. 1 is a block diagram showing an embodiment of an audio signal processing device according to the present invention.
【図２】図１に用いられるアナログスイッチの一例を示
す構成図である。FIG. 2 is a configuration diagram illustrating an example of an analog switch used in FIG.
【図３】従来のオーディオ信号処理装置の構成を示すブ
ロック図である。FIG. 3 is a block diagram showing a configuration of a conventional audio signal processing device.
１１ 信号処理回路 １２ ＣＰＵ １３ Ｄ／Ａコンバータ １４ ローパスフィルタ １５ エンファンス回路 １６ 独立ミュート回路 １７ ミュート回路 １８ ヘッドホン回路 ２１ アナログスイッチ DESCRIPTION OF SYMBOLS 11 Signal processing circuit 12 CPU 13 D / A converter 14 Low-pass filter 15 Enhance circuit 16 Independent mute circuit 17 Mute circuit 18 Headphone circuit 21 Analog switch
Claims (1)
信号と右信号に変換するＤ／Ａコンバータと、この出力
側に配設されるローパスフィルタとの間に、 該左信号が接続された左信号端子か該右信号が接続され
た右信号端子かどちらかの端子を選択し左信号として出
力するための第１のスイッチと、 該左信号が接続された左信号端子か該右信号が接続され
た右信号端子かどちらかの端子を選択し右信号として出
力するための第２のスイッチと、 該左信号と該右信号を合わせるための第３のスイッチと
からなるアナログスイッチ回路を配設したことを特徴と
するオーディオ信号処理装置。 A digital audio signal is converted to an analog left signal.
D / A converter that converts the signal into a right signal and its output
The left signal terminal to which the left signal is connected or the right signal is connected to a low-pass filter disposed on the side.
Select the right signal terminal or either terminal and output it as the left signal.
A first switch for applying power and a left signal terminal connected to the left signal or the right signal connected
Select the right signal terminal or either terminal and output as the right signal.
A second switch for applying a force and a third switch for combining the left signal and the right signal.
Characterized by the fact that an analog switch circuit consisting of
Audio signal processing device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1992008493U JP2557736Y2 (en) | 1992-01-29 | 1992-01-29 | Audio signal processing equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1992008493U JP2557736Y2 (en) | 1992-01-29 | 1992-01-29 | Audio signal processing equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0563198U JPH0563198U (en) | 1993-08-20 |
| JP2557736Y2 true JP2557736Y2 (en) | 1997-12-17 |
Family
ID=11694649
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1992008493U Expired - Lifetime JP2557736Y2 (en) | 1992-01-29 | 1992-01-29 | Audio signal processing equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2557736Y2 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01247000A (en) * | 1988-03-29 | 1989-10-02 | Asahi Optical Co Ltd | Digital sound reproducing device |
-
1992
- 1992-01-29 JP JP1992008493U patent/JP2557736Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0563198U (en) | 1993-08-20 |
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