JPH05224700A - Audio file storage - Google Patents

Abstract

(57) [Abstract] [Purpose] As a voice file storage device that captures and stores voice data from an input line, plays it back and outputs it to the line, such as used as part of an answering machine in an exchange. The number of lines that can be simultaneously reproduced, which has been conventionally suppressed to a low value due to the access time of the storage device used in the above, is increased. [Structure] A plurality of voice storage systems are provided, and a CPU for controlling them, a program memory, and a DMAC are separately provided, and when the data to be played back is stored in the storage memory 17 in the voice storage system, it is stored in the voice storage system. It is reproduced and transferred, and when it is stored in the auxiliary storage device 13 in the voice storage system, it is reproduced and transferred and also transferred to the storage memory 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used, for example, as a part of an answering machine in a telephone exchange, and takes in and stores digitized voice data from a plurality of input lines or stores the stored digital data. The present invention relates to an audio file storage device used for reproducing an audio signal and outputting it to a plurality of lines.

[0002]

2. Description of the Related Art FIG. 2 is a block diagram showing an example of a conventional audio file storage device. As you can see in the figure,
A conventional audio file storage device includes a central processing unit (CPU) 14 that controls the entire device, a program memory 15 that stores a program executed by the CPU 14, and a CPU 1.
4, a local bus 16 for connecting a program memory to a program memory, a transfer control means (DMAC) 1 for transferring an audio file
2, the auxiliary storage device 13 for storing the audio file, and the common bus 11.

Next, the operation of reproducing an audio file from the audio file storage device will be described. A hard disk device is considered as the auxiliary storage device 13 in FIG.
Further, in the audio file storage device shown in FIG. 2, it is assumed that audio data for 4 seconds is transferred as a unit. Further, the bit rate of the reproduced sound is set to 32 kbit / sec (the sound for 4 seconds is 32 kbit / sec × 4 sec = 16 kbyte). The operation procedure is shown below.

After receiving and analyzing a voice reproduction command from the outside, the CPU 14 instructs the auxiliary storage device 13 which is a hard disk device to read data. The hard disk device 13 moves the head to a predetermined track and becomes ready to read data.

Data for one track of the hard disk (sound data for 4 seconds: 16 kbytes) is transferred to the common bus 1
1 is temporarily transferred to the buffer memory inside the hard disk. The data in the buffer memory inside the hard disk is
Common bus 1 from audio file storage by MAC12
Transfer via 1 to the outside.

The time required for each operation described above can be estimated as follows. Given that the CPU executes 1000 instructions, the CPU
MIPS (1 million instructions can be executed per second) is 1 msec.

Average seek time of head is 20 mse
c, and the average rotation waiting time of the disk is 8 msec, the total is 28 msec. Time for one rotation of the disk (here, 16 msec)
Requires. If the data rotation speed of the DMAC is 10 Mbytes / sec, it takes 1.6 msec to transfer 16 kbytes of data.

The sum of the above is 46.6 msec. That is, it takes 46.6 msec to read four seconds of voice data from the voice file storage device. Further, in the case of reproducing the voices of a plurality of channels (N channels) at the same time, the access to the disk can only read the data of one channel at a certain moment, so that it takes N × 46.6 msec.

Here, in order to reproduce the voice without interruption, it is necessary to transfer the voice for 4 seconds within 4 seconds. Therefore, the maximum number of channels that can be reproduced simultaneously from the audio file storage device is: maximum number of channels that can be reproduced simultaneously from the audio file storage device = 4 sec / 46.6 msec = 86.

In practice, in order to ensure that the voice can be played back without interruption, from the viewpoint of safety design, about 40 is set as the maximum number of channels that can be played back simultaneously.

[0011]

In the conventional apparatus shown in FIG. 2, the audio file can be simultaneously reproduced for up to about 40 lines, but for about 40 lines or more, the access time of the auxiliary storage device (hard disk device), Due to the rotation waiting time, there is a problem that it is not possible to guarantee that the audio is played back without interruption.

That is, in the conventional technique, the access time and the rotation waiting time of the auxiliary storage device are limited,
It was difficult to increase the number of lines that can be played simultaneously.
Therefore, it is an object of the present invention to provide an audio file storage device capable of increasing the number of lines that can be simultaneously reproduced as compared with that of the conventional device.

[0013]

In order to achieve the above object, the present invention provides a voice file storage device for taking in and accumulating voice file data and reproducing and outputting the voice file data,

A voice storage memory consisting of a two-port memory, a first central processing unit, a first transfer control means, a two-port auxiliary storage device, one port of the voice storage memory and the first The central processing unit and the first
And a second central processing unit, which is provided with one or a plurality of audio file storage systems each including a first common bus connecting between the transfer control means and the one port of the two-port auxiliary storage device. Interconnecting the second transfer control means, the other port of the audio storage memory and the other port of the two-port auxiliary storage device in the audio file storage system of each set, and the second transfer control means. A central processing unit, second transfer control means and a second common bus also connected to the outside are provided.

[0015]

When reproducing the audio file data, when the second central processing unit determines that the audio file data to be reproduced is in any one of the audio storage memories of the audio file storage system, Under the control of the second central processing unit, the second transfer control means is used to externally output the audio file data to be reproduced from the audio storage memory of the set via the second common bus. Transfer,

When the second central processing unit determines that the audio file data to be reproduced is in the two-port auxiliary storage device of any set of the audio file storage system, the second central processing unit. The second transfer control means to transfer the audio file data to be reproduced to the outside from the two-port auxiliary storage device of the set via the second common bus.

The first central processing unit of the group is instructed, and the first transfer control means of the group is operated under the control of the first central processing unit to set the two ports of the group. The audio file to be reproduced is transferred from the auxiliary storage device to the audio storage memory of the set via the first common bus of the set. Thus, according to the audio file storage device of the present invention, the number of lines that can be simultaneously reproduced can be increased more than that of the conventional device.

[0018]

1 is a block diagram showing the configuration of an embodiment of the present invention. As shown in the figure, the audio file storage device according to the present invention includes a plurality of sets of audio file storage systems, a central processing unit (CPU) connected to them through a common bus and a control bus, and transfer control means ( DMA
C) etc. Hereinafter, they will be sequentially described.

Since all the voice file storage systems have the same structure, one of them will be described. That is, in FIG.
The audio file storage system shown at the top includes a first audio storage memory 17 composed of a two-port memory, a first central processing unit (CPU) 14, a first two-port auxiliary storage device 13, and First central processing unit (CPU) 14
A first program memory 15 connected via a first local bus 16 and a first transfer control means (DMAC) 12
And a first common bus 11 are included.

Looking at the plurality of sets of audio file storage systems as a whole, the first to Nth audio storage memories consisting of two-port memories are provided as 17, 27, ... N7, and one port of each audio storage memory is provided. 1 to N-th common buses are individually connected to each other as shown by 11, 21, ... N1, and the first to N-th common buses each store an audio file.
, N3 of the two-port auxiliary storage devices 13, 23, ... N3, first to N-th transfer control means (DMAC) 12, 22, ... N2 for transferring audio files, the two-port auxiliary storage device, the DMAC. First to N-th central processing units (CPU) 14, 24 ...

The first to Nth central processing units 1 are also provided.
4, 24 ... N4 each include first to Nth program memories 15, 25 for storing programs executed by the CPU,
... N5 is the first to Nth local buses 16, 26, ... N6
Connected by.

On the other hand, the first to Nth voice storage memories 1
, N7 and the other ports of the first to N-th two-port auxiliary storage devices 13, 23, ... N3 are connected to the (N
+1) The common bus is connected to the (N + 1) th common bus, and the (N + 1) th transfer control means (for transferring the audio files stored in the audio storage memory and the auxiliary storage device to the outside of the audio file storage device ( DMAC) and the (N +
1) The (N + 1) th central processing unit (CPU) for controlling the transfer control means is connected.

The (N + 1) th program memory for storing the program executed by the (N + 1) th central processing unit is connected by the (N + 1) th local bus.
Further, the (N + 1) th central processing unit includes the first to Nth
A central processing unit is connected to the central processing unit by a control bus K, and the first to Nth central processing units 14 are connected via the control bus K.
24 ... Control N4.

Next, the circuit operation will be described. The first central processing unit 14 mainly controls the file transfer between the first voice storage memory 17 and the first auxiliary storage device 13. The second to Nth central processing units are also used similarly.
The first common bus 11 is mainly used for file transfer performed between the first voice storage memory 17 and the first auxiliary storage device 13. The second to Nth common buses are similarly used.

The first central processing unit 14 uses the first transfer control means 12 to transfer the audio file stored in the first auxiliary storage device 13 to the first audio storage memory 17. Further, the first central processing unit 14 uses the first transfer control means 12 to transfer the audio file stored in the first audio storage memory 17 to the first auxiliary storage device 13. The second to Nth central processing units have the same operation.

The (N + 1) th central processing unit is provided outside the voice file storage device and the first to Nth voice storage memories 1.
Mainly controls the file transfer to and from 7, 27, ... N7. The (N + 1) th central processing unit is
1) The transfer control means is used to transfer the audio files stored in the first to Nth audio storage memories 17, 27, ... N7 to the outside via the (N + 1) th common bus.

The (N + 1) th central processing unit is
The (N + 1) th transfer control means is used to transfer an audio file from the outside through the (N + 1) th common bus.
Transfer to the voice storage memories 17, 27, ... N7.

The (N + 1) th central processing unit is
Mainly controls file transfer between the outside of the audio file storage device and the first to Nth auxiliary storage devices 13, 23, ... N3. The (N + 1) th central processing unit is
1) Using the transfer control means, the audio files stored in the first to Nth auxiliary storage devices 13, 23, ...
+1) Transfer to the outside via the common bus.

The (N + 1) th central processing unit is
The (N + 1) th transfer control means is used to transfer an external audio file to the first to Nth auxiliary storage devices 13, 23, ... N3 via the (N + 1) th common bus.

The (N + 1) th central processing unit is composed of
It mainly controls the Nth central processing unit. In the (N + 1) th central processing unit, the audio files to be reproduced are first to Nth.
When stored in the voice storage memories 17, 27, ... N7, the voice file is transferred to the outside by using the (N + 1) th transfer control means.

The (N + 1) th central processing unit is
The audio file to be reproduced is the first to Nth audio storage memory 1
7, 27, ... N7 if not stored in (N +
1) Applicable auxiliary storage device 1 using transfer control means
A voice file is reproduced from 3, 23, ... N3, and a command is sent via the control bus K to the central processing unit which controls the corresponding auxiliary storage device.

Upon receiving this command, the central processing unit transfers the audio file to be reproduced to the audio storage memory via the common bus. In this way, the first to Nth voice storage memories, which have shorter access times than the auxiliary storage device,
By storing audio files, the number of lines that can be played simultaneously can be increased.

A specific example of the circuit operation will be described below. When reproducing the digital data of a certain audio file to the outside, first, the (N + 1) th central processing unit determines that the audio file to be reproduced is the first to Nth audio storage memories 17 and 2.
7, ... N7, it is determined by referring to the management file for that.

If the audio file to be reproduced is the first to Nth
When stored in any of the voice storage memories 17, 27, ... N7, the (N + 1) th central processing unit is
The (N + 1) th transfer control means is used to transfer the audio file from the corresponding audio storage memory to the outside of the audio file storage device via the (N + 1) th common bus.

On the other hand, the audio files to be reproduced are first to Nth.
If it is not stored in any of the sound storage memories 17, 27, ... N7, that is, if the sound file to be reproduced is
When stored in any of the first to Nth auxiliary storage devices 13, 23, ... N3, the operation is as follows.

That is, the (N + 1) th central processing unit uses the (N + 1) th transfer control means to apply the corresponding auxiliary storage device (here, the second auxiliary storage device 23).
To transfer the audio file to the outside via the (N + 1) th common bus. At the same time, the (N + 1) th central processing unit controls the second auxiliary storage device 23 (here, it becomes the second central processing unit 24).
To the control bus K via the control bus K.

The second central processing unit 24, which has received this command, uses the second transfer control means 22 to transfer the audio file stored in the second auxiliary storage device 23 to the second common bus 21 via the second common bus 21. Transfer to the voice storage memory 27. When the transfer of the audio file is completed, the second central processing unit notifies the (N + 1) th central processing unit of the completion of the transfer.

Upon receiving this notification, the (N + 1) th central processing unit updates the management file to indicate that the voice file has been stored in the voice storage memory. With this update, when the audio file is reproduced again, the audio file is transferred from the second audio storage memory 27 to the outside.

[0039]

The effects of the present invention will be quantitatively described below. As already described with reference to FIG. 1, when reproducing an audio file from the audio file storage device according to the present invention, the audio file to be reproduced is the first to Nth audio storage memories (here, the second audio storage). Memory 27)
, The (N + 1) th transfer control means is used.
The audio file is transferred to the outside via the (N + 1) th common bus.

Here, it is assumed that the audio data for 4 seconds is transferred as a unit. In addition, the bit rate of the audio to be reproduced is 32 Kbit / sec (the audio for 4 seconds is 32
(K bits / second × 4 seconds = 16 Kbytes). The operation procedure is shown below.

The (N + 1) th central processing unit receives and analyzes the voice reproduction command from the outside, and then,
Data transfer is instructed to the transfer control means. The (N + 1) th transfer control means transfers the audio data (16 Kbytes) for 4 seconds from the second audio storage memory 27 to the outside via the (N + 1) th common bus.

When the transfer of the voice data for 4 seconds is completed, the (N + 1) th transfer control means gives a notification indicating the end.
Transmit to the (N + 1) th central processing unit. The (N + 1) th central processing unit which has received this notification is the (N + 1) th
The transfer control means is instructed to read the next 4 seconds of audio data. The above is repeated until all the data of the audio file to be played is transferred to the outside.

From the above, the time required for each operation can be estimated as follows. Assuming that the (N + 1) th central processing unit executes 1000 instructions, the CPU can execute 1 MIPS (10 MPS).
Assuming that the command can be executed 0,000 times, 1 msec
Is.

If the access time of the second audio storage memory 27 is 500 nsec and the bus width of the (N + 1) th common bus is 32 bits, then 4 seconds worth (16 Kbytes) will be obtained.
16K bytes / 32 bits x 500n
sec = 2 msec.

The (N + 1) th central processing unit is 100
Considering that 0 instructions are executed, assuming that the CPU is 1 MIPS (it can execute 1 million instructions per second), 1 m
sec.

That is, it takes 3 msec (+) to reproduce the audio data for 4 seconds (it takes only the first time). Therefore, theoretically, audio can be reproduced without interruption up to 4 seconds / 3 msec = 1333 channels. Actually, about 500 channels are appropriate from the viewpoint of safety design.

On the other hand, when there is no voice data to be reproduced in the first to Nth voice storage memories, the voices stored in the first to Nth auxiliary storage devices (here, the second auxiliary storage device 23) are stored. The file is transferred to the outside via the (N + 1) th common bus using the (N + 1) th transfer control means, and the audio file stored in the second auxiliary storage device 23 is transferred via the second common bus 21. Then, it is transferred to the second voice storage memory 27.

When the same audio file as described above is reproduced again by performing the transfer to the second audio storage memory 27, since it is reproduced from the second audio storage memory 27, the number of lines that can be simultaneously reproduced. Can be about 500 channels.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

FIG. 2 is a block diagram showing a conventional example of a voice file storage device.

[Explanation of symbols]

11, 21, N1 ... Common bus, 12, 22, N2 ... Transfer control means, 13, 23, N3 ... Auxiliary storage device, 14, 2
4, N4 ... Central processing unit, 15, 25, N5 ... Program memory, 16, 26, N6 ... Local bus, 1
7, 27, N7 ... Voice storage memory

Claims (1)

[Claims] 1. A voice file storage device for fetching and storing voice file data, reproducing and outputting the voice file data, a voice storing memory comprising a two-port memory, a first central processing unit, and a first transfer. Between the control means, the two-port auxiliary storage device, one port of the voice storage memory, the first central processing unit, the first transfer control means, and one port of the two-port auxiliary storage device. And a first common bus for connecting the audio file storage system, one or a plurality of audio file storage systems, a second central processing unit, a second transfer control means, and the audio file storage system of each set. , The other port of the voice storage memory and the other port of the two-port auxiliary storage device are interconnected, and the second central processing unit and the second transfer control means are not provided. And a second common bus that is also connected to the outside, and when reproducing the audio file data, the audio file data to be reproduced is stored in an audio storage memory of any one of the audio file storage systems. When the second central processing unit determines that there is, the second transfer control means is operated under the control of the second central processing unit, and the second storage control memory is used to store the second data from the second storage processing memory. The audio file data to be reproduced is transferred to the outside via the two common buses, and the audio file data to be reproduced is stored in any one of the two-port auxiliary storage devices of the audio file storage system. When the central processing unit determines, the second transfer control means is operated under the control of the second central processing unit to connect the second common bus from the two-port auxiliary storage device of the set. Through Then, the audio file data to be reproduced is transferred to the outside, and at the same time, the first central processing unit of the set is instructed, and the first central processing unit of the set is controlled under the control of the first central processing unit. The transfer control means for transferring the audio file to be reproduced from the 2-port auxiliary storage device of the set to the audio storage memory of the set via the first common bus of the set. An audio file storage device characterized by.