JPS5864862A - Digital audible tone generating circuit - Google Patents

Abstract

PURPOSE:To generate an arbitrary audible tone at arbitrary intermittent intervals in an arbitrary time slot, by providing a rewritable storage device in an automatic exchange. CONSTITUTION:An audible tone memory 40 which stores a continuous signal tone required for the constitution at least >=1 kind of audible signal tones in the form of digital coding, an intermittent information memory 50 which stores at least >=1 kind of intermittent control information of the continuous signal tone read out from this memory, and a combined selecting information memory 60 storing the combined selecting information between the continuous signal tone and the intermittent, control information in an address corresponding to a time- division multiplexing time slot number of the audible signal tone, are provided. At each time slot which performs time division multiplexing of the audible signal tone, the continuous signal tone of the memory 40 selected at the memory 60 and the intermittent control information of the memory 50 are read out, and each information is combined to generate the required audible signal tone.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a digital audible tone generation circuit for an automatic switchboard.

In conventional digital audible sound generation circuits, the intermittent interval of audible sound is fixed, and the combination of intermittent interval and audible sound is uniquely determined for each time slot, resulting in lack of flexibility.

An object of the present invention is to eliminate the above-mentioned drawbacks, and to provide a rewritable storage device, which is a flexible digital memory device that makes it possible to generate any audible sound at any intermittent interval in any time slot. The object of the present invention is to provide an auditory sound generation circuit.

The digital audible tone generation circuit according to the present invention 11 is capable of digitally generating at least one type of continuous signal tone necessary to construct an audible signal tone in an automatic switching system in which audible signal tones are digitally time-division multiplexed and supplied to a communication line. A first storage device (hereinafter referred to as an audible sound memory) that stores information in encoded form, and a second storage device that stores at least one type of intermittent control information for continuous signal sounds read from the audible sound memory. a storage device (hereinafter referred to as an intermittent information memory), a third memory that stores combination selection information of the continuous signal tone and the intermittent control information at an address corresponding to a time slot F number for time-division multiplexing the front of the audible signal; A device (hereinafter referred to as a combination selection information memory) is provided, and the continuous signal tone of the audible sound memory selected by the combination selection information memory and the intermittent information memory are provided for each time slot for time-division multiplexing the audio signal front. The intermittent control information is read out and the two pieces of information are combined to generate a desired audible signal. Said 1st. Second. Since the third storage device can arbitrarily set the information to be stored and can be reset, it can be configured as a flexible digital audible sound generation circuit.

Next, embodiments of the present invention will be described using the drawings.

The drawing shows an embodiment of the present invention, which stores (n+1) 11 types of continuous signal tones and (m+1) types of intermittent control information,
1 is a diagram illustrating a digital audible sound generation circuit that generates a parallel 8-bit signal sound; FIG.

In this figure, when the clock generation circuit 10 receives a clock signal and the counter circuit 20 operates, (n+1) types of continuous signal tones are read out from the audible sound memory 40 and are synchronized with the clock signal output from the clock generation circuit 10. and is temporarily stored in buffer registers 70 to 7r%. The intermittent information memory 50 is also read out by the counter circuit 20, and Cm+1) types of intermittent control information are stored on the signal lines 200 to 20.
mK is output. On the other hand, the one combination selection information memo 960 is read out by the output of the slot number designation circuit 30, and outputs a continuous tone selection signal to the signal line 300 and an intermittent control information selection signal to the signal line 400, respectively. The continuous sound selection circuits 90 to 97 receive the continuous sound selection signal from the signal line 30G, select one from (n+1) types of continuous signal sounds, and output it.
0 to receive an intermittent control information selection signal, signal lines 200 to 2
One of the intermittent control information input from 0m is selected and output. The continuous sound intermittent circuits 100 to 107 output continuous signal sounds input from the continuous sound selection circuits 90 to 97 intermittently based on the intermittent control information received from the intermittent control information selection circuit 80.

The above operation is performed for each time 1 time division multiplexing of audible signal tones.
ly).

As is clear from the above explanation, the first. By making it possible to set the information in the second and third storage devices arbitrarily, it is possible to generate an audible blue signal at an arbitrary intermittent interval in an arbitrary time slot.

A flexible digital audible sound generation circuit is obtained.

[Brief explanation of the drawing]

The drawing is a diagram showing a digital audible sound generation circuit according to an embodiment of the present invention. 10-Ritatsuku generation circuit, 20-Counter circuit, 30-Time slot number designation circuit. 40 - Audible tone memory (first storage). 50-intermittent information memory (second storage device), 60-combination selection information memory (third storage device). 70 to 7n--Buffer register. 80...Intermittent control information selection circuit. 90-97-・Continuous sound selection circuit. 100~IG7-・Continuous signal front intermittent circuit. Agent Patent Attorney Toshi Somekawa Blind

Claims (1)

[Claims] In an automatic switching system in which an audible signal tone is digitally time-division multiplexed and supplied to a communication path, at least one type of continuous signal blue necessary to constitute the audible signal tone is gay-digitally encoded. a first storage device that stores at least one type of intermittent control information for the continuous signal tone read out from the first storage device; a third storage device that stores a combination of intermittent control information (selection information) at an address corresponding to a time slot number in which the audible signal tone is time-division multiplexed; The continuous signal tone of the first storage device selected by the third storage device and the intermittent control information of the second storage device are read out, and the desired audible signal tone is generated by combining #2. A digital audible sound generation circuit characterized by generating.