JPH01153762U

JPH01153762U -

Info

Publication number: JPH01153762U
Application number: JP5170088U
Authority: JP
Priority date: 1988-04-18
Filing date: 1988-04-18
Publication date: 1989-10-23

Description

[Brief explanation of the drawing]

第１図は本考案の電話装置の通話レベル自動調
整回路の一実施例を示した回路構成図、第２図の
イ，ロ，ハは通話動作に使われるＮＴＴ回線、構
内回線との接続関係を示した図で、イ図はＮＴＴ
回線を用いての加入者同志の通話接続関係を示す
図、ロ図は構内回線内での通話接続関係を示す図
、ハ図は構内回線とＮＴＴ回線を介しての通話接
続関係を示す図、第３図は利得制御回路の特性図
、第４図のａ，ｂはＮＴＴ回線のリンガー信号に
対応する波形を示した波形図でａはＮＴＴ回線を
介し送られてくるリンガー信号の波形図、ｂはａ
の信号をパルス化した波形図、第５図のａ，ｂは
構内回線内のリンガー信号に対応する波形を示し
た波形図でａは構内回線内のリンガー信号の波形
図、ｂはａの信号をパルス化した波形図である。主な図番の説明、７……スピーチ回路、１１…
…利得制御回路、１２……スイツチ回路、１３…
…コントロール回路、１８……ダイヤル信号発生
回路、１９……ダイヤル操作信号検出回路、２４
……リンガー信号検出回路。 Fig. 1 is a circuit configuration diagram showing one embodiment of the automatic call level adjustment circuit of the telephone device of the present invention, and Fig. 2 A, B, and C are connection relationships with NTT lines and local lines used for call operations. Figure 1 shows NTT
Diagram illustrating the connection relationship between subscribers using lines; Figure 2 shows the connection relationship between subscribers within the premises line; Figure C shows the connection relationship between subscribers via the premises line and NTT line; Fig. 3 is a characteristic diagram of the gain control circuit, a and b in Fig. 4 are waveform diagrams showing waveforms corresponding to the ringer signal of the NTT line, and a is a waveform diagram of the ringer signal sent via the NTT line. b is a
Figure 5 a and b are waveform diagrams showing the waveforms corresponding to the ringer signal in the local line, a is a waveform diagram of the ringer signal in the local line, and b is the signal of a. FIG. Explanation of main figure numbers, 7...Speech circuit, 11...
...Gain control circuit, 12...Switch circuit, 13...
...Control circuit, 18...Dial signal generation circuit, 19...Dial operation signal detection circuit, 24
...Ringer signal detection circuit.

Claims

[Scope of Claim for Utility Model Registration] (1) A speech circuit connected to a telephone line, a gain control circuit that controls the gain of the speech circuit for transmitting and receiving calls, and a switch that changes the control operation state of the gain control circuit. circuit, and a dial operation signal detection circuit that detects a signal generated in response to the operation of the dial operation button and controls switching of the switch circuit. The switch circuit changes in response to the output signal of the operation signal detection circuit,
The gain control circuit is put into the auto-pat operation state, and in the case of a call between local lines, the switch circuit is switched in response to the output signal of the dial operation signal detection circuit, and the gain control circuit is put into the fixed-pat operation state. An automatic call level adjustment circuit for a telephone device, characterized in that the circuit automatically adjusts the call level of a telephone device. (2) A speech circuit connected to a telephone line, a gain control circuit that controls the gain of the speech circuit for sending and receiving calls, a switch circuit that switches the control operation state of the gain control circuit, and a switch circuit that is connected to the telephone line. It consists of a ringer signal waveform shaping circuit that shapes the waveform of the incoming ringer signal, and a ringer signal detection circuit that detects the signal output from the ringer signal waveform shaping circuit and controls switching of the switch circuit. When a ringer signal from a general subscriber's line is received by a telephone device connected to An automatic call level adjustment circuit for a telephone device, characterized in that when a ringer signal detection circuit receives a ringer signal, the switch circuit switches the gain control circuit to a fixed operation state.