JPH09271084A - Bidirectional data transferring method and encoded voice data recording/reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To bidirectionally and efficiently transfer data in each channel between a data highway and a disk device. SOLUTION: Everytime when any one of buffer memories 9-1 to 9-9 is successively selected for a fixed period as a highway buffer memory, data are bidirectionally transferred between the selected memory and the highway through an interface circuit 1. On the other hand, each of non-highway buffer memories bidirectionally transfers data to/from the disk device 6 through an interface circuit 5 in a state suppressing seak time and rotation waiting time as less as possible.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bidirectional time division multiplexed data highway and a (coded audio) data recording / reproducing disk device via a plurality of buffer memories.
The present invention relates to a bidirectional data transfer method in which (encoded voice) data is bidirectionally transferred in units of channels, and further relates to an encoded voice data recording / reproducing apparatus as an equipment attached to an electronic exchange.

[0002]

2. Description of the Related Art A magnetic disk device, an optical disk device, a magneto-optical disk device or the like (hereinafter referred to as a disk device) is used as a data storage / reproduction device, and data is transferred to or from which data is recorded or reproduced. Many techniques have been known so far, but most of them are under the condition that one is a data input / output interface for a personal computer and the other is a data input / output interface for a magnetic disk. Is. That is, both interfaces are both interfaces for transferring data in batches discontinuously (hereinafter, referred to as batch input / output type data transfer interface).
The reality is that the technology of high-efficiency / high-speed data transfer between a computer and a disk device is exclusively used. As a technique related to data transfer between a computer and a disk device, for example, one described in Japanese Patent Laid-Open No. 2-81223 is known. In this case, a dual port buffer or the like is provided in the disk controller, so that data transfer with the disk device of the disk controller and data transfer with the host computer of the disk controller are performed in parallel. It can be done by.

[0003]

By the way, encoded audio data recording including a disk device as a main component, in which encoded audio data is bidirectionally transferred on a channel-by-channel basis with a bidirectional time division multiplexed data highway. / Assuming a playback device (a type of equipment attached to an electronic exchange), the data input / output interface conditions up to now, that is, if both are batch input / output type data transfer interfaces, the data input / output interface Clearly, the conditions will be quite different. This is because one side is a highway interface (transmission line termination interface or sequential input / output type data transfer interface) in which encoded voice data is time-division multiplexed on the highway and is continuously transferred. Is a batch input / output type data transfer interface. Therefore, until now, no suitable technique has been found as a technique for performing bidirectional data transfer between interfaces having different properties at high speed and efficiently. However, in principle, it is possible to adopt a dual port RAM having two input / output ports as a means for enabling such data transfer.
Considering the large amount of data transfer on the batch input / output type data transfer interface, it is clear that the capacity is currently insufficient.

A first object of the present invention is that data is bidirectionally channel by channel between a bidirectional time division multiplexed data highway having different data input / output interface conditions and a data recording / reproducing disk device. An object of the present invention is to provide a bidirectional data transfer method that can be efficiently transferred. A second object of the present invention is to provide coded voice data between a bidirectional time division multiplexed data highway having different data input / output interface conditions and a coded voice data recording / reproducing apparatus as an equipment attached to an electronic exchange. Is bidirectional for each channel,
Moreover, it is intended to provide a bidirectional data transfer method capable of efficient transfer. A third object of the present invention is to provide coded voice data as a facility attached to an electronic exchange, which allows coded voice data to be transferred bidirectionally and efficiently on a channel-by-channel basis with a bidirectional time division multiplexed data highway. A recording / reproducing device is provided.

[0005]

Means for Solving the Problems The first and second objects of the present invention are that, of a plurality of buffer memories arranged in parallel in advance, only one of them sequentially and cyclically changes the frame cycle. Each time the buffer memory for the highway is selected for a certain time as an integral multiple, the buffer memory for the highway is in the state where the buffer memory for the highway is separated from the processor bus. The bidirectional time-division multiplexed data highway is bidirectionally transferred over the entire channel (encoded voice) in units of channels via the circuit, while the non-highway buffer other than the highway buffer memory is also used. In each memory, the channel range selected in synchronization with the selection as the buffer memory for highway In, DMA by the processor
Under control, the seek time and the rotation waiting time are suppressed as much as possible between the data recording / reproducing disk device via the data transfer interface circuit for the disk device, and the (encoded audio) data is transmitted in units of channels. It is achieved by being transferred to the other side.

The third object is to provide only one of the highway data transfer interface circuit and the processor bus sequentially and cyclically over a fixed time as an integral multiple of the frame period. Each time the buffer memory for the highway is selected, the buffer memory for the highway is separated from the processor bus by the bidirectional time division multiplexing via the data transfer interface circuit for the highway. Encoded voice data is bidirectionally transferred in units of channels to and from the data highway, and in each non-highway buffer memory other than the highway buffer memory, it is used as the highway buffer memory. Within the selected channel range in synchronization with the Under the DMA control by the encoder, the encoded audio data is recorded as a state in which the seek time and the rotation waiting time are suppressed as much as possible between the encoded audio data recording / reproducing disk device via the disk device data transfer interface circuit. This is achieved by arranging a plurality of buffer memories in parallel so that the data can be transferred bidirectionally in units of channels.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below with reference to FIGS. First, a data recording / reproducing apparatus according to the present invention will be described. FIG. 1 is a block diagram showing an encoded audio data recording / reproducing apparatus including an encoded audio data recording / reproducing disk device and a plurality of buffer memories as constituent elements. / It shows the configuration of an example of the reproducing apparatus. As shown in the figure, the device is related to two types of interfaces, and the interface in the highway interface circuit 1 is a serial bidirectional time division multiplexed data highway interface (sequential input / output type data) based on PCM time division multiplexing of 48 channels. Transfer interface), and the information transfer amount of each channel is 64 kbp, for example.
s, the encoded voice data is transmitted and received in synchronization with a frame pulse of 8 kHz (frame cycle: 125 μs). The interface of the SCSI interface circuit 5 is a batch input / output type data transfer interface, and the SCSI interface circuit 5 is connected with a hard disk device 6 as a disk device for recording / reproducing encoded audio data. Has become. In the hard disk device 6, the magnetic head is mechanically moved to a designated position in the radial direction on the rotating magnetic disk, and external data can be recorded on the magnetic disk via the SCSI interface circuit 5. The data read from the magnetic disk is readable externally via the SCSI interface circuit 5.

By the way, when recording data in the hard disk device 6 or reading data from the hard disk device 6, generally, the time (seek time) required for the magnetic head to move to a designated position and the magnetic head In the state where the head is moved to the designated position, the time (rotation waiting time) until the desired data head reaches just below the magnetic head is required. These times are not negligible compared with the time required to actually record data on the magnetic disk and the time required to actually read data from the magnetic disk. When data is transferred bi-directionally, the magnetic disk must be optimally accessed by considering not only the seek time and rotation waiting time of the magnetic head but also the data transfer amount. It has become a thing. In other words, data recording and data reading in which the magnetic head is frequently moved on the magnetic disk is not preferable because it substantially slows down the data transfer time in terms of access efficiency. Therefore, if the data is collectively recorded / read while the number of times of movement of the magnetic head is suppressed as much as possible, the efficiency in data transfer can be improved. Thus, it can be said that the hard disk device 6 is a batch input / output type data transfer interface.

Now, the encoded voice data recording / recording shown in FIG.
More specifically, the highway interface circuit 1 includes a buffer memory 9 (9-1 to 9-1).
9-9) is connected to the buffer memory bus switching circuit 2 together with the buffer memory bus switching circuit 2.
Any one of these buffer memories 9-1 to 9-9
Only one of them is selected as a buffer memory for the highway, and it is connected to the highway interface circuit 1 while being separated from the microprocessor bus 8.
The remaining 8 memory cells function as buffer memories for non-highway connection so that they can be connected to the microprocessor bus 8. Which one of the buffer memories 9-1 to 9-9 is sequentially selected as the anti-highway buffer memory is determined by the reference time generation timer circuit 3 for a fixed period (generally an integral multiple of the frame period). It is based on autonomous control based on a signal, for example, a 0.5-second periodic signal. The buffer memory 9-1 is first selected as the anti-highway buffer memory for 0.5 seconds, and then the buffer memory 9-2 is selected as the anti-highway buffer memory for 0.5 seconds. In addition, each of the buffer memories 9-1 to 9-9 is sequentially selected as the buffer memory for the highway. After the buffer memory 9-9 is selected as the buffer memory for the highway for 0.5 seconds, the buffer memory 9-1 is selected again as the buffer memory for the highway. Therefore, in the state where the buffer memory for highway is connected to the highway interface circuit 1 for 0.5 seconds, all 48 channels are encoded between the highway interface circuit 1 and the bidirectional time division multiplexed data highway. Audio data is bidirectionally transferred in units of channels. On the other hand, the batch input / output type data transfer interface is controlled by the firmware, but in parallel with the above data transfer operation, a reference time is generated between each of the eight non-highway buffer memories and the hard disk device 6. The 0.5 second cycle signal from the timer circuit 3 is used as an interrupt trigger, and the coded voice data is bidirectionally transferred for each channel under the DMA transfer control by the DMA controller 4 under the microprocessor 7.

Incidentally, referring to the capacities of the buffer memories 9-1 to 9-9, the capacities are the same, but for example, assuming that the frame period is 125 μs,
If encoded voice data is transferred bidirectionally for 0.5 seconds, a capacity corresponding to 4000 (= 0.5 seconds / 125 μs) frames is required. In other words, each channel requires a capacity for storing 4000 channels of encoded audio data.

As described above, in the buffer memory for the highway, the coded voice data is channel-wise on all 48 channels with the bidirectional time-division multiplexed data highway through the highway interface circuit 1 for 0.5 seconds. Data is being transferred bidirectionally to each of the eight non-highway buffer memories and the hard disk drive 6 at the same time.
, And the encoded voice data are bidirectionally transferred in units of channels, and FIG. 2 shows a data transfer method at that time. As shown in the figure, the horizontal axis is the arrangement of the buffer memories 9-1 to 9-9, while the vertical axis is also the data string corresponding to the channel, for example, 6 data strings are 1 data string group. It has become a thing. Assuming that the buffer memories 9-1 to 9-9 are sequentially selected as the buffer memory for the highway, in this example, the buffer memory 9-5 is selected as the buffer memory for the highway for 0.5 seconds. In this state, the encoded voice data for all 48 channels is transferred between the buffer memory 9-5 and the bidirectional time division multiplexed data highway via the highway interface circuit 1. It is understood that is transferred in both directions. On the other hand, in parallel with the data transfer operation, the buffer memories 9-1 to 9-4 and 9-6 to
9-9 and the hard disk device 6 between the data strings 25 to 30 corresponding to the data string group 5, that is, the channel N.
It can be seen that the encoded voice data is bidirectionally transferred for each channel for 0.5 seconds for the channels corresponding to o. Thus, when the buffer memory 9-5 is selected as the buffer memory for the highway, only the data strings corresponding to the specific data string group 5 are buffer memories 9-1 to 9-4 and 9-6 to. 9-9
The encoded voice data is bidirectionally transferred in units of channels between each of them and the hard disk device 6, because of the relationship between the seek time and the rotation waiting time described above, all the data string groups 1 to 1 within 0.5 seconds. It is impossible to access the magnetic disk for 8 times, so that the data strings 1 to 48 are divided into the data string groups 1 to 8. How the number of data string groups is specifically set may be specifically determined in consideration of the performance on the hard disk device 6 such as seek time, rotation waiting time, and data transfer rate. Is.

Here, the buffer memories 9-1 to 9-4,
Between each of 9-6 to 9-9 and the hard disk device 6,
The case where the encoded voice data is bidirectionally transferred in units of channels will be specifically described as follows. That is, in the data transfer, the seek time and the rotation waiting time are suppressed as much as possible, and therefore it is necessary to perform the data transfer while minimizing the seek count and the rotation wait count of the magnetic head. The data transfer can be performed promptly by seeking the magnetic head and waiting for rotation. For example, data strings 25-30
Assuming that the data transfer is performed in this order, first, after the data transfer is continuously performed for the data string 25 in the order of the buffer memories 9-6 to 9-9 and 9-1 to 9-4, 9-6 to 9-9 and 9-1 to 9-4 are successively transferred in the order of the data sequence 26, and the same data transfer is repeated in the order of the data sequences 27 to 30. All you have to do is to be told.

Eventually, with the completion of the selection of the buffer memory 9-5 as the buffer memory for the highway for 0.5 seconds, the buffer memory 9-6 is selected as the new buffer memory for the highway for 0.5 seconds. ,
In this state, between the buffer memory 9-6 and the bidirectional time division multiplexed data highway, the encoded audio data for all 48 channels is bidirectionally transferred, while the data transfer operation is performed in parallel. , Buffer memory 9
-1 to 9-5 and 9-7 to 9-9 and the hard disk device 6 respectively, the data strings 31 to 3 corresponding to the data string group 6 are connected.
6, that is, for channels corresponding to channel Nos. 31 to 36, the coded voice data is bidirectionally transferred in channel units for 0.5 seconds. Hereinafter, each time the buffer memories 9-7 to 9-9 are sequentially selected as the buffer memory for the highway in this order, the data string group 7
9 to 9 are sequentially selected in this order, and similar data transfer is repeatedly performed.
Is selected as the buffer memory for the highway, the buffer memory 9-1 is selected as the buffer memory for the highway, and the data is transferred sequentially and cyclically.

Finally, referring to the number of buffer memories 9 according to the present invention, as is clear from the above description, the number must be one more than the number of data string groups. This is because one buffer memory must be separated from the microprocessor bus 8 and data must be transferred to and from the bidirectional time division multiplexed data highway at all times.

[0015]

As described above, according to the first aspect of the present invention, data is channeled between the bidirectional time division multiplexed data highway and the data recording / reproducing disk device having different data input / output interface conditions. A bidirectional data transfer method capable of bidirectionally and efficiently transferring in units, and in the case of claim 2, a bidirectional time division multiplexed data highway having different data input / output interface conditions, and an electronic exchange. A bidirectional data transfer method capable of bidirectionally and efficiently transferring coded voice data in units of channels to and from a coded voice data recording / reproducing device as an auxiliary equipment. Equipped with an electronic exchange that enables coded voice data to be transferred bidirectionally and efficiently on a channel-by-channel basis with a bidirectional time division multiplexed data highway. Encoded audio data recording / reproducing apparatus as equipment has become one obtained.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an example of a coded voice data recording / reproducing apparatus according to the present invention as an equipment attached to an electronic exchange.

FIG. 2 is a diagram for explaining a data transfer method between bidirectional time division multiplexed data highways and coded audio data recording / reproducing disk devices in the device.

[Explanation of symbols]

1 ... Highway interface circuit, 2 ... Buffer memory bus switching circuit, 3 ... Reference time generation timer circuit, 4 ...
DMA controller, 5 ... SCSI interface circuit, 6 ... Hard disk device, 7 ... Microprocessor, 8 ... Microprocessor bus, 9 (9-1-9-9) ... Buffer memory

Front page continuation (72) Inventor Morio Ito 3-19-2 Nishishinjuku, Shinjuku-ku, Tokyo Nippon Telegraph and Telephone Corporation

Claims (3)

[Claims] 1. A bidirectional time division multiplexed data highway,
A bidirectional data transfer method for bidirectionally transferring data to / from a data recording / reproducing disk device on a channel-by-channel basis. Each time only one of them is selected as the anti-highway buffer memory sequentially and cyclically for a fixed time as an integral multiple of the frame period, the anti-highway buffer memory selects the anti-highway buffer memory. Is separated from the processor bus, data is bidirectionally transferred on a channel-by-channel basis over all channels to and from the bidirectional time-division multiplexed data highway via the highway data transfer interface circuit. For each non-highway buffer memory other than the highway buffer memory, Seek time and rotation waiting time with the data recording / reproducing disk device via the data transfer interface circuit for the disk device under the DMA control by the processor within the selected channel range in synchronization with the selection as the memory. Is suppressed as much as possible,
A bidirectional data transfer method that allows data to be transferred bidirectionally in channel units. 2. A bidirectional time division multiplexed data highway,
A bidirectional data transfer method for bidirectionally transferring coded voice data to / from a coded voice data recording / reproducing device as a facility attached to an electronic exchange. In the playback apparatus, only one of a plurality of buffer memories arranged in parallel in advance is cyclically and cyclically directed to the highway buffer memory for a fixed time as an integral multiple of the frame period. , The buffer memory for highway is separated from the bidirectional time-division multiplexed data highway via the data transfer interface circuit for highway in a state where the buffer memory for highway is separated from the processor bus. Encoded voice data is transferred bidirectionally on a channel-by-channel basis across all channels, while for the above highway In each of the non-highway buffer memories other than the buffer memory, the code is transmitted via the disk device data transfer interface circuit under the DMA control by the processor within the selected channel range in synchronization with the selection as the highway buffer memory. A bidirectional data transfer method in which encoded voice data is bidirectionally transferred in units of channels with a seek time and a rotation waiting time being suppressed as much as possible between the disc drive for recording / reproducing the encoded voice data. . 3. The bidirectional time-division multiplexed data highway comprises a highway data transfer interface circuit and a plurality of bidirectional time-division multiplexed data highways so that encoded voice data can be bidirectionally transferred in units of channels to and from the bidirectional time-division multiplexed data highway. In a state where the processor bus is accommodated via a buffer memory, and the encoded audio data recording / reproducing disc device is accommodated in the processor bus via the disc device data transfer interface circuit, under the DMA control by the processor, Encoding as electronic equipment attached to the bidirectional time-division multiplexed data highway and the encoded audio data recording / reproducing disk device so that the encoded audio data is bidirectionally transferred in units of channels. An audio data recording / reproducing apparatus, comprising a highway data transfer interface circuit and Any one between the Rossa bus
Each time only one of them is selected as the buffer memory for the highway for a fixed time as an integer multiple of the frame period, the buffer memory for the highway has a buffer memory for the high processor. In the state of being separated from the bus, the encoded voice data is bidirectionally transferred on a channel-by-channel basis over all channels to and from the bidirectional time division multiplexed data highway via the highway data transfer interface circuit. In each of the non-highway buffer memories other than the highway buffer memory, the data transfer interface circuit for the disk device is under DMA control by the processor within the selected channel range in synchronization with the selection as the highway buffer memory. For recording / playback of encoded audio data via A configuration in which a plurality of buffer memories are arranged in parallel in advance so that the encoded voice data can be transferred bidirectionally in units of channels with the seek time and the rotation waiting time being suppressed as much as possible with the communication device. Coded audio data recording / reproducing device.