JPH04101545A - Subscriber calling signal generating method - Google Patents

Abstract

PURPOSE:To make it possible to supply a subscriber with a calling signal having an arbitrary pattern without generating noise by carrying out switching from sending to stopping or stopping and sending of consecutive calling signals at a zero cross timing that signal level becomes '0'. CONSTITUTION:A calling signal pattern for a calling voice such as bell of a receiving subscriber is arbitrarily specified and registered in a control circuit 4 in advance. A calling signal to be sent out from a calling signal generating circuit l is input in a zero-cross detecting circuit 2, and a zero-cross generating timing is transmitted to the control circuit 4 via an interrupt generating circuit 3 and bus 6. The control circuit 4 sends out a signal to direct a signal relay switch 5 to relay a signal in correspondence with a specified calling signal pattern and in synchronous with a zero-cross generating timing, and controls sending and stopping sending a calling signal from the calling signal generating circuit l to a calling signal relay line 7. With this, an arbitrary calling signal can be supplied to a telephone subscriber.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a system for generating a calling signal for a telephone subscriber.

[Conventional technology]

Conventional telephone subscriber ringing signal generation systems use intermittent ringing signals and signals indicating interrupted portions of the signal to generate a ringing sound such as a bell that alerts the called subscriber of an incoming call. Sending out.

In order to prevent noise when transmission is stopped, a relay for relaying the calling signal to the telephone subscriber is controlled during the signal interruption portion to generate a calling signal in the required pattern.

[Problem to be solved by the invention]

The conventional subscriber ringing signal generation method described above creates a ringing tone for the called subscriber based on intermittent ringing signals and signals indicating interrupted portions of the signal, so the pattern of the ringing tone (ringing signal) is limited. It has the disadvantage of being

[Means to solve the problem]

The telephone subscriber ringing signal generation system of the present invention includes: a ringing signal generating means for generating continuous ringing signals; a zero-crossing detecting means for detecting a zero-crossing of the ringing signal from the ringing signal generating means; a signal relay means for controlling the transmission of the ringing signal from the ringing signal generating means to the telephone subscriber; and a signal relaying instruction corresponding to a designated ringing signal pattern and synchronized with the timing of zero-crossing detection by the zero-crossing detecting means. and control means for sending the call signal to the signal relay means, and is configured to supply the call signal in an arbitrary pattern to the telephone subscriber.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention. A calling signal generation port B1 that generates continuous calling signals,
It is connected to a zero-crossing detection circuit 2 that detects zero-crossing of a calling signal, and a signal relay switch 5 that is controlled by a control circuit 4, and sends out a calling signal to the outside (telephone subscriber) via a signal relay line 7. The control circuit 4 has a CPU and a memory, and is connected to the zero-cross detection circuit 2 via a bus 6 and an interrupt generation circuit 3.

Next, the operation will be explained.

In advance, a pattern of a ringing signal for a ringing tone such as a bell of a called subscriber is arbitrarily designated and registered in the control circuit 4.

A calling signal sent from the calling signal generating circuit 1 is input to the zero-cross detecting circuit 2, and the timing of the zero-crossing is determined by the interrupt generating circuit 3. It is transmitted to the control circuit 4 via the bus 6. The control circuit 4 sends a signal relay instruction to the signal relay switch 5 in accordance with the specified pattern of the calling signal and in synchronization with the zero-cross generation timing, and transmits the calling signal relay line for the calling signal from the calling signal generating circuit 1. Controls transmission to and stop of transmission to 7.

It should be noted that the pattern of the ringing signal registered in the control circuit 4 can be changed to any pattern, and thereby the pattern of the ringing tone to the called subscriber can be arbitrarily designated.

〔Effect of the invention〕

As explained above, the present invention enables continuous calling signals to be sent out and stopped at the timing of the zero cross when the signal level becomes "0", thereby creating an arbitrary pattern without generating noise. A ringing signal can be provided to the telephone subscriber.

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[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Call signal generation circuit, 2... Zero cross detection circuit, 3... Interrupt generation circuit, 4... Control circuit, 5
... Signal relay switch, 6... Bus, 7... Calling signal relay line.

Claims (1)

[Claims] a ringing signal generating means for generating a continuous ringing signal;
zero-crossing detection means for detecting zero-crossings of the calling signal from the calling signal generating means; signal relaying means for controlling transmission of the calling signal from the calling signal generating means to the telephone subscriber in accordance with a signal relay instruction; control means for sending a signal relay instruction to the signal relay means corresponding to the pattern of the paging signal and synchronized with the timing of zero cross detection by the zero cross detection means, A system for generating a calling signal for a telephone subscriber, characterized in that the calling signal is supplied.