JPH025078B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Technical Field of the Invention The present invention relates to a tone generation function of an exchange.

(2) Prior art and its problems A highway switch that performs the switching function of a digital exchange usually uses memory to control the read order. Figure 1 shows the channel from one direction.
This is a diagram illustrating a speech bus that outputs the input sound of _A1 to channel _A2 . Now channel A ₁ ,
It is assumed that the transmission signal of _A2 is stored at addresses 1 and 2 of the communication path memory 1, respectively. When reading this, if you record the contents of address memory 2 that gives the address of communication path memory 1 in the order of #2 and #1, the contents of address 2 of communication path memory 1 will be read first. , the order of signals on the receiving highway is changed in the order of channels A ₂ and A ₁ .
This is the most basic principle of exchange.

Now, in the exchange, dial tones, ringback tones, and various other tones are prepared as resources. Additionally, various tone breaks are provided as audible indications of advanced features. Conventionally, to provide normal intermittent, intermittent circuits 9, 10, and 11 were provided in the tone oscillation circuits 13 and 14 to input to the system. In addition, in FIG. 2, 3 and 4 are telephones;
5 is a hybrid circuit (H), 6 and 12 are analog circuits.
A digital conversion circuit (A/D), 7 a digital/analog conversion circuit (D/A), and 8 a highway switch (HWS). In FIG. 2, telephone 3
When listening to tone 1, the signal path is as shown by the arrow [13 → 9 → 12 → sending highway → highway
switch 8 → receiving highway → 7 → 5 → 3].

Although this configuration is the easiest to understand, it has the following drawbacks.

1 Intermittent pattern is fixed by hardware.

2. Even if the sound source is the same, if the intermittent patterns are different, an A/D function must be added for each.

As mentioned above, the method 1 has drawbacks in terms of functionality, and the method 2 has drawbacks in terms of cost.

(3) Purpose of the Invention The present invention provides a tone intermittent system in a highway switching system that can simplify hardware and reduce costs by creating an intermittent pattern using a microprocessor by devising a highway switch circuit. It is something to do.

(4) Structure of the Invention In order to achieve this object, the tone intermittent method in an exchange using a highway according to the present invention has a plurality of storage areas corresponding to channels of a highway call memory connected to a sending highway. digitized audio frequency signals of a plurality of channels are stored in a predetermined order, and the plurality of audio frequency signals are received from the highway call memory in an order specified by the contents of the addresses stored in the highway address memory. In an exchange controlled to appropriately switch and connect a plurality of channels of the sending highway to a plurality of channels of the receiving highway by sending to a highway, One storage area stores a signal obtained by digitizing a continuous tone of an audio frequency from one channel of the sending highway, and another specific storage area stores a digital code specifying silence; The highway address memory alternately designates and reads the one storage area and the specific storage area for a channel on the receiving highway that is exchange-connected to a channel on the sending highway corresponding to the storage area. The present invention has a configuration characterized in that the audio frequency intermittent tone is transmitted.

The present invention will be explained in detail below.

FIG. 3 shows an embodiment of the present invention, in which 1 is a call memory, 2 is an address memory, 15 is a control circuit (CTL), and 16 is a central processing unit (CPU).
In this embodiment, the two transmission signals multiplexed on the transmission highway are stored at addresses 1 and 2 of the communication path memory 1. At address 3 of this communication path memory 1, a code 00 corresponding to silence is stored in advance. The address memory 2 is written by the control circuit 15, and initially #2 and #1 are written at addresses 1 and 2, respectively. In this state, as shown in FIG. 1, transmission signals are output on the receiving highway in the order of channels A ₂ and A ₁ . At this time, when the control circuit 15 rewrites the contents of address 1 of the address memory 2 to #3 indicating silence, outputs appear on the receiving highway in the order of silence and channel _A1 . In other words, channel A ₂ has been changed to silence. If address 1 of address memory 2 is rewritten to #2, the original state will be restored. To enable such control, the control circuit 15 only needs to receive information as shown in FIG. 4 from the central processing unit 16.

The control signal 15 writes the contents to the address memory address specified by , but rewrites the contents and the silent storage address at a predetermined cycle according to the information of the intermittent pattern shown by .

FIG. 6 shows another embodiment of the present invention. In this embodiment, when the control circuit 15 receives data in the format shown in _FIG . write data for _B1 memory 2-2, and intermittent pattern information (at the same time). Address memories 2-1, 2- that store the readout order of audio frequency signals from the highway channel memory 1
2 and 2-3 are always read out at the same time, and at this time the switch 17 selects either the address memory 2-1 or the address memory 2-2 according to the information specified in the address memory 2-3. The pattern in which the switch 17 is switched by the switch control circuit 18 is the same as the tone intermittent pattern.

FIG. 7 shows channel A ₁ in the embodiment of FIG.
the tone specified by channel A ₂ to the handset of
This is an example of an operation flow when intermittent operation is performed at a ratio of 10:5.

Further, FIG. 8 is an example of an operation flow in the embodiment of FIG. 6.

The operations shown in FIGS. 7 and 8 will be described in detail below.

FIG. 7 shows the channel in the embodiment of FIG.
This figure shows the operation flow when the tone specified by channel A ₂ is intermittent at a ratio of 10:5 to the handset of A ₁ . When a 701 connection request occurs, the 702 central processing unit 16 sends data to the control circuit 15 in accordance with the format shown in FIG. 703 control circuit 15 once stores the received data in the management buffer, and then analyzes the data in the management buffer in a predetermined order.

704 When the timing for analyzing the channel buffer corresponding to address 1 of address memory 2 comes, 705 first analyzes the intermittent pattern indicating the connection form. The data received as the 706 intermittent pattern information is "01", which is predetermined to be a busy tone connection that is intermittent at a ratio of 10:5. 708 Therefore: After setting the software counter for determining the tone sending time to "10", the control circuit 15 performs 709
1 of address memory 2 corresponding to channel A ₁
Write #2, which is the address of the communication path memory 1 corresponding to channel A ₂ , which is the source of the tone to be sent, into the address. Thereafter, the software counter is updated 712 at every 712 predetermined date.
When the 711 count value becomes 0, the software counter is set to 5 in order to determine the time to stop transmitting the 713 tone. In the present invention, to stop tone transmission is to transmit a code representing silence stored in advance in the channel memory 1. Therefore, the 714 silence code is stored at address 1 of the address memory 2 instead of #2. Write specific address #3 for. 715 The counter value is incremented by one day, and if the 716 counter value is not "0", 717 secures a predetermined delay, and 715 the counter value is incremented by one day, and 716 if the counter value becomes "0". ,
Buffer analysis is performed again to determine whether a change has occurred in the 704 connection configuration. 705-706 Unless there is a change in the intermittent pattern, operations 708-716 are repeated.

As described above, for each address in the address memory 2, the control circuit 15 alternately rewrites an arbitrary address in the channel memory 1 and a specific address for silence at predetermined intervals, thereby changing the tone. It is possible to realize discontinuity.

FIG. 8 is an example of the operation flow of FIG. 6, which is another embodiment of the present invention. 801 now, channel A ₁
When a request for a busy tone connection in which the tone specified by channel A ₂ is intermittent at a ratio of 10:5 is generated in the receiver of the 802, the central processing unit 16 of the 802 causes the control circuit 15 to perform the following in accordance with the format shown in FIG. Corresponding to B ₁ , B ₂ , (01, 02, 03,
01) data is sent.

The 803 control circuit 15 sets a data reception flag for the address specified in the received data, and records the data from B ₁ to 804 in a buffer allocated in advance for the same address. The control circuit 15 then scans the reception flag, and if the flag for 805 address 01 has been reset when it is checked, it will scan the 806 next address 02.
Perform a flag check for 805 Current address 0
Since the flag for 1 is set, the 807 control circuit 15 checks the data of B ₁ ~ from the buffer, writes the data of B ₁ to address 1 of the 808 address memory 2-1, and then writes the data of B 1 to address 1 of the 810 address memory 2-3. Write the data to address 1.
The 811 control circuit 15 resets the data reception flag for address 01 after the write operation is completed. Thereafter, it waits for a new connection request while scanning the reception flag.

As described above, in this embodiment, once writing is performed in the address memories 2-1 to 2-3, the desired intermittent pattern can be realized, and there is no need to rewrite the contents of the address memory at each intermittent on/off interval. Omitted.

(5) Effects of the Invention As described above, according to the present invention, it is easy to change the intermittent pattern, and as long as the tone sound source has the same frequency and signal level, the same sound source can be used even if the intermittent pattern is different. There are advantages.

[Brief explanation of drawings]

FIG. 1 is a block diagram for explaining the principle of an exchange, FIG. 2 is a block diagram showing an example of the structure of a conventional tone intermittent system, FIG. 3 is a block diagram showing an embodiment of the present invention, and FIG. FIG. 5 is a diagram showing an example of a control signal format used in this embodiment. FIG. 5 is a diagram showing another example of a control signal format used in the present invention. FIG. 6 is a block diagram showing another embodiment of the present invention.
and FIG. 8 are flowcharts showing an example of the operation of the system of the present invention. 1...Call path memory, 2, 2-1, 2-2, 2
-3...Address memory, 3, 4...Telephone, 5
...hybrid circuit, 6,12...analog
Digital converter, 7...Digital-analog converter, 8...Highway switch, 9, 10, 1
1...Digital-to-analog converter, 13, 14...
...Tone oscillation circuit, 15... Control circuit, 16...
Central processing unit, 17... switch, 18... switch control circuit.

Claims (1)

[Claims] 1. In a plurality of channel-corresponding storage areas of a highway call memory connected to a sending highway, digitized audio frequency signals of a plurality of channels from the sending highway are stored in a predetermined order. , receiving the plurality of audio frequency signals from the highway call memory and transmitting them to the highway in an order specified by the contents of the addresses stored in the highway address memory, thereby transmitting the plurality of channels of the sending highway to the plurality of receiving highways. in an exchange controlled to provide appropriate switching connections to the channels of the highway, one storage area of the plurality of storage areas in the highway call memory stores audio frequency continuous tones from one channel of the forward highway. digitized signal is stored, and a digital code specifying silence is stored in another specific storage area, and the receiving highway is exchange-connected to the channel on the sending highway corresponding to the one storage area. The highway address memory is configured to alternately designate and read out the one storage area and the specific storage area for the channel to transmit the audio frequency intermittent tone. Intermittent tone system in exchanges. 2. The address memory is single, and alternate designation of the audio frequency continuous tone storage area and the specific storage area is performed by rewriting the address of the address memory. An intermittent tone system in an exchange using a highway according to claim 1. 3. A plurality of address memories are provided, and alternate designation of the storage area of the audio frequency continuous tone and the specific storage area is performed by switching among the plurality of address memories. An intermittent tone system in an exchange using a highway according to claim 1.