JPS63197997A - Message transmission system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a message sending system that can be used in digital exchanges and the like.

(B) Conventional Technology Conventional digital exchanges provide voice services that repeatedly send out messages such as "Morning Call" and "Dead Number Yoshikawa." (For example, JP-A-61-69
(Refer to Publication No. 250) As an example of this message sending method, for example, a message to be sent is sent in advance by a PCM signal, an A
Convert to digital signal such as DPCM signal and store in ROM'4F
There is a structure in which the digital signals are stored in a storage means and sequentially read out using an address counter.

(c) Problems to be Solved by the Invention In the prior art described above, the address counter is generally designed assuming the maximum length of the voice message to be provided, and when a short message is repeatedly played back, a long silence is required. Occasionally, a gap may occur. As a means to avoid this, it has been proposed to use a jumper, for example, to change the reproduction cycle of the message repetition by one second, but the circuit configuration becomes complicated and the cycle setting is complicated.

The present invention has been conceived in view of the above-mentioned problems, and it is an object of the present invention to provide a message sending system in which the reproduction cycle of messages and repeats can be easily changed with a simple structure.

(2) Means for Solving the Problems The present invention provides a message sending system that repeatedly outputs voice messages stored in a storage means as digital codes, and uses a digital code string near 0 level as a message terminal T.
This message sending system is characterized in that when the message end signal is detected by the message end signal detection means, the address designation means for designating the address of the storage means is reset.

(E) Operation A digital code string that does not appear in the voice message is added to the end of the voice message, and when this digital code string is detected, the addressing means is reset. That is, since the addressing means is reset by the digital code string, the message repeat reproduction period can be set to a value corresponding to the message.

(F) Embodiment First, a method of converting audio into a μ-law PCM signal will be described below.

Figure 2 shows the audio-PCM signal conversion characteristics, negative side #'i
It is symmetrical about the origin and has 15 polygonal characteristics including positive and negative. Each polyline is divided into 16 uniform steps, step interval #
The distance from the i origin is twice that of the distance from the origin. Such characteristics are called μ characteristics, and the input fx and output ky
Then, it is expressed as . In addition, in the embodiment of the present invention, PCM-24B
Using the method, μ was set to 255.

By the method described above, the analog input terminal 0 (V) which is silent
, -0(lfl respectively?LFFH, 7FH are PCM coded. Therefore, if silence is PCM coded, FF
It is thought that H and 7FH will each occur with a probability of 50 or more.

The message is over! Since it is necessary that the number 8 does not give the listener a sense of strangeness and that it does not appear in the message, the message ending number 7 (i#) can be expressed by, for example, eight consecutive FFHs.

In addition to this, the message end signal is 7 F' *
FEI (#7EH, etc.) can be used. In other words, a digital code string near 0 level can be used as a message end signal.For example, if all silence in a message is expressed as 7FH, the message ends. The y! number can also be expressed by one FFH.

Figure 1 is a circuit diagram of a message reproducing circuit formed as a trunk of a two-circuit digital exchange;
I) and a circuit (■).

+Ij is a P/S converter which converts all 8-bit data into serial # and outputs it to the output highway (6).

[21f18 human-powered AND circuit, all 8-bit data is IH/In other words, when the data is 'FFHI', it outputs 'H'i, and when the data is other than 'FFH', it outputs 'L'.
Output. (3) is a ROM (storage means),
line! 7) When the selection signal from +81 is 'L', data based on the address output from the terminal (Ql) of the counter (addressing means) (4) is output from the output terminal (Dl).The clock of the counter (4) A clock signal is input from the line (9) to the terminal (CK), and the count is incremented at the falling edge of this clock signal.Furthermore, when tHt is input to the clear terminal (CL) of the counter (4), the count value is increased. is reset, and all outputs from the terminal (Q) become 'L'.

+51fl is a synchronous counter (message end signal detection means) and is pre-processed at the rising edge. In other words,
When a rising edge is input to the clock terminal (CK), if the output from the AND circuit (2) (input to the clear terminal (CL) of the synchronized counter) is 'L', the counter value is reset, IH / If it is, count up. The selection signal 8 from lines +71 and +8+ selects all circuits (1) and (II), respectively, and also connects the clock terminal (6) of the synchronous counter (6).
CK) as a clock signal.The previous version of the above-mentioned message reproducing circuit (I) will be described below with reference to FIG. Line at time 11 (
When the selection signal from 7) becomes IL/, the terminal (OE) of ROM (3) becomes /Ll and the terminal (OE) of counter (4) becomes /Ll.
All data based on the address supplied from Q is input to the output terminal (output from E. This 8-bit data P/S converter tl), where it is converted to serial data and output to the output highway (6). Ru. Further, the 8-bit data is input to the AND circuit (2), and the data is 'FFH
'H', otherwise p! , I(, I) is output from the AND circuit (2).

At time χ2, the selection signal from line (7) rises, and at this rising edge, the synchronous counter (6) starts its previous operation. In other words, at this rising edge, the AND circuit (
If the output from 2) is /1,1, is it the count value of the synchronous counter (5)? If it is reset and ``H'', it counts up. Output terminal of tank chronus counter (5) (from Q, if count value is 0 to 7, 'L', 8
If it is above, rHt is output.

Therefore, if all the 8-bit data from ROM+31 are 'FFH' at 8 consecutive times χ2 (12 appears every 125 μs), the synchronous counter (5
) counts up without being reset and becomes the output H'H' from the output terminal (Q).

'H' from this output terminal (QJ) resets the counter (4) and all outputs from the output terminal (Q) become ILL. In other words, all 8 consecutive 98-bit data are 'FFU/(
At the time of message end signal), all outputs of the counter (4) become 'L', and the start address of ROM+31 is called.

Note that the circuit (■) K is also the same as the previous work.

Further, the message end signal can be a digital code string near the O level, and it is clear that the combination and length can be set arbitrarily.

(G) Effects of the Invention As is clear from the above description, the present invention uses a digital code string near the O level that does not give a sense of discomfort to the listener as a message end signal, and uses this message end signal to reset the addressing means. The message repeat reproduction period can be arbitrarily set according to the length of the message stored in the storage means.

Therefore, it is possible to provide a complete message sending system whose circuit configuration is an hour wheel and whose cycle can be easily set.

[Brief explanation of the drawing]

@ Figure 1 is a circuit diagram of a message playback circuit as an embodiment of the present invention, Figure vJ2 is a diagram showing all the voice-PCM signal 8 conversion characteristics,
FIG. 3 is a time chart. (lj...P/S converter, (2)...AND circuit,
(3)... ROM (storage means), +41... counter (address specifying hand Ji3j), t5+... synchronous counter (message end T signal detection means).

Claims (1)

[Claims] (1) In a message sending method that repeatedly outputs a voice message stored in a storage means as a digital code, when a digital code string near the O level is used as a message end signal, and this message end signal is detected by a message end signal detection means. , a message sending method characterized in that addressing means for specifying an address of the storage means is reset.