JPS6452346U

JPS6452346U -

Info

Publication number: JPS6452346U
Application number: JP14884587U
Authority: JP
Priority date: 1987-09-28
Filing date: 1987-09-28
Publication date: 1989-03-31

Description

[Brief explanation of drawings]

第１図は本考案の一実施例を示すブロツク図で
ある。Ｍ……ベル音検知器、Ａ……フイルター、Ｂ…
…回数設定記憶器、Ｃ……照合器、Ｃ１……ベル
音長計測カウンター、Ｃ２……ベル音回数カウン
ター、Ｅ……タイマー、Ｆ……制御器、Ｏ……メ
ツエージ記憶器、Ｄ……表示器。 FIG. 1 is a block diagram showing one embodiment of the present invention. M...Bell sound detector, A...Filter, B...
...Number of settings memory, C...Verifier, C1...Bell sound length measurement counter, C2...Bell sound number counter, E...Timer, F...Controller, O...Metsage memory, D... display.

Claims

[Scope of utility model registration request]

A detector that detects the ringing sound of a telephone, a filter that removes noise from the output of the detector, a counter that counts the number of signals output from the filter, and a counter that measures the reading time of one signal; a number memory whose settings can be easily changed; a collation device that compares the output of the counter with the output of the number memory; and a timer that detects the passage of a finite time;
A storage device storing display information, a display device displaying the display information, and a control for controlling the display information storage device in response to output signals of the counter, the measurement counter, the collation device, and the timer. A bell sound detection indicator characterized by having a bell sound detection indicator.