JPS60202570A - Double-structure storage system of sound information - Google Patents

Abstract

PURPOSE:To improve the using efficiency of a storing device for sound information with reduction of storage capacity and to miniaturize the storage system, by storing the sounds to the 1st and 2nd storage means after coding those sounds by the 1st and 2nd code converting means. CONSTITUTION:The input sounds are supplied simultaneously to a code converting part 1 of a normal bit rate and to a code converting part 2 of a bit rate lower than the part 1 to be coded and then stored to sound storing parts 4 and 5 via a data transfer part 3 in the form of the digital information. In a reproduction mode, the sound coded by the part 1 is usually read out of the part 4 and decoded by the part 1 via the part 3 to be outputted as a sound signal. In case the 1st system has a fault, the sound coded by the part 2 is read out of the part 5 and decoded by the part 2 via the part 3 to be outputted. In such a way the capacity of a storing device which is needed to a message is reduced. Thus the using efficiency is improved with the total miniaturization of a storing system for the storing device.

Description

[Detailed Description of the Invention] The present invention includes an audio code conversion means, an audio data transfer means, and an audio storage means, and encodes input audio and stores it as digital information, and conversely reads and decodes the stored information. The present invention relates to an audio storage/reproduction system for reproducing audio, and in particular to a dual storage method for audio information in which audio storage means are duplicated for the purpose of reproducing audio information.

<Background> Conventionally, in audio storage/reproduction systems, encoded audio is stored as is in two storage devices and duplicated in order to prevent the audio from becoming unplayable due to failure of the storage means. It had become Therefore, the capacity of the storage device needed to be twice as large as the audio information to be stored. For example, 3
1 to store 30 seconds of audio information at a rate of 2Kbp8
A file memory of 20K" is required, and therefore, in the conventional duplex system, the total memory capacity required 240K".For this reason, large-capacity storage devices were made smaller and more economical. However, it has the drawback that it is inefficient and uneconomical, and also requires a lot of space for installing the system.

<Structure of the Invention> The purpose of the present invention is to reduce the storage capacity as a whole, to improve the utilization efficiency of the storage device, and to reduce the storage cost and reduce the size of the system. The object of the present invention is to provide a dual storage method.

According to the present invention, the first code converter and the second code converter having a lower bit rate than the first code converter are provided as the audio code converter, and the input audio is converted into the first code converter and the second code converter whose bit rate is lower than that of the first code converter. The second code converting means encodes each of the first and second codes. It is stored in the second storage means.

When the first system using the first storage means is normal, the first system regenerates, and when the first system has a failure, the second system using the second storage means regenerates. .

<Embodiment> FIG. 1 shows an embodiment of the present invention, in which input audio is input to a code converter 1 at a normal bit rate as shown by broken lines and dotted lines.
and the low pit rate code converter 2, which has a lower bit rate, are encoded and sent as digital information via the data transfer unit 3 to the audio storage unit 4.
, 5.

During playback, normally the audio encoded by the transcoding unit 1 is read out from the audio storage unit 4 as shown by the broken line.
The signal is passed through the data transfer section 3, decoded by the normal code conversion section 1, and output as an audio signal.

If the first system of the transcoding unit 1 and the audio storage unit 4 is disabled and cannot be used, the audio encoded by the transcoding unit 2 is transferred to the audio storage unit 4 as shown by the dotted line.
The data is read out from the data transfer section 3, decoded by the low bit rate code conversion section 2, and then output.

FIG. 2 shows another embodiment of the invention, in which parts corresponding to those in FIG. 1 are given the same reference numerals. As shown by the broken line, the input voice is first encoded by a normal code conversion section 1, passed through a data transfer section 3, and stored in a voice storage section 4.5 in a duplicated manner. The encoded audio from one of the audio storage units 5 is read out as shown by the dotted line, and supplied to the code conversion unit 2 through the data transfer unit 3, where it is encoded at a low bit rate and then sent to the data transfer unit 3. After that, it is stored again in the audio storage section 5.

During playback, the audio encoded only by the code converter 1 is normally read out from the audio storage unit 4, passed through the data transfer unit 3, decoded by the normal code converter 1, and then output. If the first system cannot operate due to a failure in the storage section 4, the audio encoded in the code conversion section 1-2 is read out from the audio storage section 5 and sent via the data transfer section 3. The code conversion unit 2.1 sequentially decodes and outputs the data.

In addition, in FIG. 2, the coded audio by the code conversion unit 1 that has been stored once in the audio storage unit 5 is encoded by the low pit rate code conversion unit 2 without going through the data transfer unit 3. You may go.

In this case, it is necessary to deal with the problem of conflict between an external request to the audio storage section 5 and a request for conversion to a low bit rate code. Alternatively, after the audio coded by the code conversion section 1 is stored in the audio storage section 4, it may be read out, encoded by the low bit rate code conversion section 2, and stored in the audio storage section 5.

Effects> As explained above, by adopting the method of the present invention, the capacity of the storage device required for one message can be reduced. For example, the conventional encoding method is 32Kbps.
, LSP method as low bit rate encoding, PARC
If 2.4 Kbps, such as the OR method, is adopted, the amount of file memory can be reduced by 46%. Therefore, the cost increase due to the increase in hardware normally required for low bit rate code conversion is smaller than the file reduction effect achieved by this method, so this invention can achieve economy by improving the utilization efficiency of the storage device, and also reduce the size of the entire system. It also has the advantage of being able to measure

[Brief explanation of the drawing]

Both FIG. 1 and FIG. 2 are block diagrams showing an embodiment of the present invention. 1... Ordinary code conversion section, 2... Low pit rate code conversion section, 3... Data transfer section, 4, 5... Audio storage section. Patent applicant Takuo Kusano, agent of Nippon Telegraph and Telephone Public Corporation 1 Figure 2

Claims (3)

[Claims] (1) Consisting of a voice code conversion means, a voice data transfer means, and a voice storage means, the input voice is encoded by the voice code conversion means and stored as digital information in the voice storage means, and conversely, the voice storage means In an audio storage/playback system for decoding digital information read out by the audio transcoding means and reproducing audio, the audio transcoding means includes a first transcoding means and the first transcoding means. A second code converter with a lower bit rate is provided, and the audio input to the system is encoded by the first and second code converters, respectively, and the encoded first and second code converters are respectively encoded. The digital information of No. 2 is stored in the audio storage means of No. 1. When the first system for the first digital information is normal, the NN1 system is used to reproduce the first digital information, and when the first system is in failure, the second digital information is reproduced. A dual storage system for audio information, characterized in that encoded digital information is decoded and output in a second system. (2) In (1), only the first encoding is performed and stored in the storage device, and then the encoded digital information newly stored in the first storage device is encoded at a lower bit rate. A dual storage method for audio information, characterized in that the second encoded digital information is generated and stored. (3) (2) K Audio characterized in that the first encoded digital information is stored in two storage devices in advance, and one of them is converted into the second encoded digital information and stored. Dual information storage method.