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JP2506753B2 - Digital telephone device - Google Patents
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JP2506753B2 - Digital telephone device - Google Patents

Digital telephone device

Info

Publication number
JP2506753B2
JP2506753B2 JP9895087A JP9895087A JP2506753B2 JP 2506753 B2 JP2506753 B2 JP 2506753B2 JP 9895087 A JP9895087 A JP 9895087A JP 9895087 A JP9895087 A JP 9895087A JP 2506753 B2 JP2506753 B2 JP 2506753B2
Authority
JP
Japan
Prior art keywords
power supply
circuit
amplifier
telephone device
digital telephone
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
Application number
JP9895087A
Other languages
Japanese (ja)
Other versions
JPS63263954A (en
Inventor
浩実 窪田
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP9895087A priority Critical patent/JP2506753B2/en
Publication of JPS63263954A publication Critical patent/JPS63263954A/en
Application granted granted Critical
Publication of JP2506753B2 publication Critical patent/JP2506753B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Description

【発明の詳細な説明】 産業上の利用分野 本発明は、デジタル電話装置に関する。FIELD OF THE INVENTION The present invention relates to digital telephone devices.

従来の技術 第2図は従来のデジタル電話装置の呼出音増幅兼モニ
ター回路の構成を示している。第2図において、31は構
内交換機30との絶縁トランス、32は伝送用LSI、33は符
号器(CODEC)、34は増幅器、35はスピーカ、36は安定
化電源であり、この安定化電源36により本回路全ての電
源を供給している。
2. Description of the Related Art FIG. 2 shows the structure of a ringing tone amplifying and monitoring circuit of a conventional digital telephone device. In FIG. 2, 31 is an isolation transformer with the private branch exchange 30, 32 is a transmission LSI, 33 is an encoder (CODEC), 34 is an amplifier, 35 is a speaker, and 36 is a stabilizing power supply. Supplies all power to this circuit.

次に上記従来例の動作について説明する。絶縁トラン
ス31で受けたデジタルの音声信号を伝送用LSI32を経てC
ODEC33によりD/A変換し、変換後、増幅器34により増幅
してスピーカ35より出力する。この時、増幅器34の供給
電源が安定化電源36であるので、電圧により音圧レベル
が変動し、音質が劣化してしまうのを防止することがで
きる。
Next, the operation of the above conventional example will be described. The digital audio signal received by the isolation transformer 31 is passed through the transmission LSI 32 to C
D / A conversion is performed by the ODEC 33, and after conversion, the signal is amplified by the amplifier 34 and output from the speaker 35. At this time, since the power supply of the amplifier 34 is the stabilized power supply 36, it is possible to prevent the sound pressure level from varying due to the voltage and the sound quality from being deteriorated.

発明が解決しようとする問題点 しかしながら、上記従来のデジタル電話装置では、音
質が劣化しないように増幅器34の供給電源に安定化電源
36を用いているため、デジタル電話装置の電源部の小型
化、ローコスト化を図ることができないという問題があ
った。
DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the above-described conventional digital telephone device, a stabilized power supply is used as the power supply of the amplifier 34 so that sound quality is not deteriorated.
Since 36 is used, there has been a problem that it is not possible to reduce the size and cost of the power supply unit of the digital telephone device.

本発明は、このような従来の問題を解決するものであ
り、電源部の小型化、ローコスト化を図ることができる
ようにしたデジタル電話装置を提供することを目的とす
るものである。
The present invention solves such a conventional problem, and an object of the present invention is to provide a digital telephone device capable of reducing the size and cost of a power supply unit.

問題点を解決するための手段 本発明は上記目的を達成するため、アナログ信号を増
幅するために順次前置増幅器と増幅器であるシングルエ
ンドプッシュプル回路が設けられ、上記前置増幅器に安
定化電源により電圧が印加され、上記シングルエンドプ
ッシュプル回路に構内交換機からの直流給電電圧が直接
印加され、かつ上記前置増幅器から安定化電源による一
定信号が入力されるように構成されたものである。
Means for Solving the Problems In order to achieve the above object, the present invention is provided with a preamplifier and a single-ended push-pull circuit which is an amplifier in order to amplify an analog signal, and the preamplifier has a stabilized power supply. Is applied to the single-end push-pull circuit, the DC power supply voltage from the private branch exchange is directly applied to the single-end push-pull circuit, and a constant signal from the stabilized power supply is input from the preamplifier.

作用 本発明は上記構成により次のような作用を有する。す
なわち、シングルエンドプッシュプル回路は入力回路電
圧は一定であれば、出力が直流供給電圧に依存されない
性質を有するので、このシングルエンドプッシュプル回
路に構内交換機から直流供給電圧を印加しても音圧レベ
ルの変動を防止し、音質の劣化を防止することができ
る。したがって、前置増幅器の電源にのみ安定化電源を
用いることができる。
Action The present invention has the following actions due to the above configuration. That is, since the output of the single-end push-pull circuit is not dependent on the DC supply voltage if the input circuit voltage is constant, even if the DC supply voltage is applied to this single-end push-pull circuit from the private branch exchange, the sound pressure It is possible to prevent fluctuations in level and prevent deterioration in sound quality. Therefore, the stabilized power supply can be used only as the power supply for the preamplifier.

実施例 以下、本発明の実施例について図面を参照しながら説
明する。第1図は本発明の一実施例を示し、呼出音増幅
兼モニター回路の回路図である。
Examples Hereinafter, examples of the present invention will be described with reference to the drawings. FIG. 1 shows an embodiment of the present invention and is a circuit diagram of a ringing tone amplifying / monitoring circuit.

第1図において、11は構内交換機(PBX)10との絶縁
トランス、12は伝送用LSI、13は符号器(CODEC)、14は
前置増幅器、15はシングルエンドプッシュプル(SEPP)
回路、16はスピーカである。前置増幅器14には安定化電
源17より電圧が印加され、SEPP回路15には構内交換機10
からの直流給電電圧が直接印加される。
In FIG. 1, 11 is an isolation transformer with a private branch exchange (PBX) 10, 12 is a transmission LSI, 13 is an encoder (CODEC), 14 is a preamplifier, and 15 is a single-end push-pull (SEPP).
The circuit, 16 is a speaker. A voltage is applied from the stabilized power supply 17 to the preamplifier 14, and the private branch exchange 10 is connected to the SEPP circuit 15.
The DC power supply voltage from is directly applied.

次に上記実施例の動作について説明する。 Next, the operation of the above embodiment will be described.

絶縁トランス11で受けたデジタルの音声信号を伝送用
LSI12より伝送し、符号器13によりアナログ信号に変換
する。この符号器13より出力されるアナログ信号を前置
増幅器14で一たん増幅し、SEPP回路15により増幅してス
ピーカ16より出力する。この時、SEPP回路15は入力回路
電圧が一定であれば、出力が直流供給電圧に依存されな
い性質を有するので、SEPP回路15に前置増幅器14から安
定化電源17による一定信号を入力させることによりこの
SEPP回路15に構内交換機10から直流供給電圧を印加して
も音圧レベルの変動を防止し、音質の劣化を防止するこ
とができる。
For transmission of digital audio signals received by isolation transformer 11
It is transmitted from the LSI 12 and converted into an analog signal by the encoder 13. The analog signal output from the encoder 13 is once amplified by the preamplifier 14, amplified by the SEPP circuit 15, and output from the speaker 16. At this time, the SEPP circuit 15 has a property that the output does not depend on the DC supply voltage if the input circuit voltage is constant, so that by inputting a constant signal from the preamplifier 14 to the stabilized power supply 17 to the SEPP circuit 15. this
Even if a DC supply voltage is applied to the SEPP circuit 15 from the private branch exchange 10, it is possible to prevent fluctuations in sound pressure level and prevent deterioration in sound quality.

このように上記実施例によれば、電源が安定化電源で
なくてもよいSEPP回路15を増幅器として使用しているた
め、安定化電源17を小型化、ローコスト化できるという
利点を有する。
As described above, according to the above-described embodiment, since the SEPP circuit 15 whose power supply does not have to be the stabilized power supply is used as the amplifier, there is an advantage that the stabilized power supply 17 can be downsized and the cost can be reduced.

発明の効果 以上述べたように本発明によれば、アナログ信号を増
幅するために順次前置増幅器と増幅器であるシングルエ
ンドプッシュプル回路を設け、前置増幅器に安定化電源
により電圧を印加し、シングルエンドプッシュプル回路
に構内交換機からの直流給電電圧を直接印加し、かつ前
置増幅器から安定化電源による一定信号を入力させるよ
うに構成しているので、シングルエンドプッシュプル回
路の出力が直流供給電圧に依存せず、音圧レベルの変動
を防止することができる。したがってデジタル電話装置
の電源部の小型化、ローコスト化を図ることができる。
As described above, according to the present invention, a pre-amplifier and a single-end push-pull circuit, which is an amplifier, are sequentially provided to amplify an analog signal, and a voltage is applied to the pre-amplifier by a stabilized power supply. Since the DC power supply voltage from the private branch exchange is directly applied to the single-end push-pull circuit, and a fixed signal from the stabilized power supply is input from the preamplifier, the output of the single-end push-pull circuit is supplied by DC. It is possible to prevent the fluctuation of the sound pressure level without depending on the voltage. Therefore, it is possible to reduce the size and cost of the power supply unit of the digital telephone device.

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

第1図は本発明の一実施例におけるデジタル電話装置を
示し、呼出音増幅兼モニター回路の回路図、第2図は従
来のデジタル電話装置を示し、呼出音増幅兼モニター回
路の回路図である。 10…構内交換機、11…絶縁トランス、12…伝送用LSI、1
3…符号器(CODEC)、14…前置増幅器、15…シングルエ
ンドプッシュプル(SEPP)回路、16…スピーカ、17…安
定化電源。
1 is a circuit diagram of a ringing tone amplifying / monitoring circuit according to an embodiment of the present invention, and FIG. 2 is a circuit diagram of a ringing tone amplifying / monitoring circuit according to a conventional digital telephone device. . 10 ... Private branch exchange, 11 ... Isolation transformer, 12 ... Transmission LSI, 1
3 ... Encoder (CODEC), 14 ... Preamplifier, 15 ... Single-end push-pull (SEPP) circuit, 16 ... Speaker, 17 ... Stabilized power supply.

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】アナログ信号を増幅するために順次前置増
幅器と増幅器であるシングルエンドプッシュプル回路が
設けられ、上記前置増幅器に安定化電源により電圧が印
加され、上記シングルエンドプッシュプル回路に構内交
換機からの直流給電電圧が直接印加され、かつ上記前置
増幅器から安定化電源による一定信号が入力されるよう
に構成されていることを特徴とするデジタル電話装置。
1. A pre-amplifier and a single-end push-pull circuit, which is an amplifier, are sequentially provided to amplify an analog signal, and a voltage is applied to the pre-amplifier by a stabilized power supply to the single-end push-pull circuit. A digital telephone device characterized in that a DC power supply voltage from a private branch exchange is directly applied and a constant signal from a stabilized power supply is inputted from the preamplifier.
JP9895087A 1987-04-22 1987-04-22 Digital telephone device Expired - Lifetime JP2506753B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9895087A JP2506753B2 (en) 1987-04-22 1987-04-22 Digital telephone device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9895087A JP2506753B2 (en) 1987-04-22 1987-04-22 Digital telephone device

Publications (2)

Publication Number Publication Date
JPS63263954A JPS63263954A (en) 1988-10-31
JP2506753B2 true JP2506753B2 (en) 1996-06-12

Family

ID=14233379

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9895087A Expired - Lifetime JP2506753B2 (en) 1987-04-22 1987-04-22 Digital telephone device

Country Status (1)

Country Link
JP (1) JP2506753B2 (en)

Also Published As

Publication number Publication date
JPS63263954A (en) 1988-10-31

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