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Sound coding mode, sound coder, and data recording media

A voice coding and coding technology, which is applied in the fields of voice coding devices, data storage bodies, and voice coding methods, can solve the problems of impossible real-time processing, intermittent voice, and inappropriate real-time processing.

Inactive Publication Date: 2007-07-18
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The structure of the existing audio coding method and audio coding device is as described above, and is suitable for making high-quality audio coded data with a storage medium as an object. In terms of processing, it is not appropriate to perform real-time processing on a PC with existing CPU capabilities
Moreover, even when running on a PC equipped with a high-performance CPU capable of real-time processing, real-time processing may not be possible due to the increase in CPU occupancy of other applications, resulting in the possibility of intermittent sound.

Method used

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  • Sound coding mode, sound coder, and data recording media
  • Sound coding mode, sound coder, and data recording media
  • Sound coding mode, sound coder, and data recording media

Examples

Experimental program
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Embodiment 1

[0057] Here, the case of an encoding method in which an input signal is divided into a plurality of frequency components and encoded in each frequency band (sub-band) by utilizing the variation in power in each frequency band will be described. FIG. 1 is a conceptual diagram of an overall system when a dedicated computer (hereinafter referred to as PC) is used as an audio coding apparatus of the above coding method. In the figure, 1 is a so-called multimedia PC that can input data from external devices such as a camera 17 and a microphone 19, a hard disk drive (HDD) 11 with a large storage capacity for storing various data and programs, and a hard disk drive (HDD) 11 connected to the HDD 11. The PD driver 12a and the FD driver 12b of the detachable coal storage body with small storage capacity for input and output of programs and data, etc., the program stored in the above-mentioned HDD is executed by an appropriate random drive according to the command of the central processin...

Embodiment 2

[0095] Next, a data recording medium according to Embodiment 2 of the present invention will be described.

[0096] The processing shown in each embodiment of the present invention can be easily implemented in an independent computer system by recording the coding program for realizing the audio coding device or coding method shown in Embodiment 1 on a data storage medium such as a floppy disk.

[0097] Fig. 10 is an explanatory diagram for implementing the encoding process of the first embodiment above by a computer system using a floppy disk storing the above encoding program.

[0098] Fig. 10(a) shows the appearance, cross-sectional structure, and floppy disk body seen from the front of the floppy disk, and Fig. 10(b) shows the physical format of the floppy disk body.

[0099] The above-mentioned floppy disk FD is a structure in which the above-mentioned floppy disk body D is accommodated in the floppy disk case FC. On the surface of the floppy disk body D, a plurality of c...

Embodiment 3

[0104]Next, the speech coding method and speech coding apparatus according to the third embodiment will be described with reference to the drawings. The high-band encoding processing device 24 shown in FIG. 2 employs the configuration shown in FIG. 3 . The structure of the low-band encoding processing device 23 is shown in FIG. 12. Similar to that shown in FIG. 11, the encoding method for encoding in each frequency band (sub-energy band) is adopted by utilizing the uneven power of each frequency band, but only the predetermined Bit allocation is not performed on each energy band signal of the auditory mental model analysis device, but a simple auditory mental model part 4062 with a small amount of processing is newly set, according to the masking threshold of the auditory mental model part 4061 output from the previous frame and the frequency band of the frame Bit allocation is performed on the bit allocation information generated by dividing the signal.

[0105] Fig. 12 is a...

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Abstract

The invention provides an audio coding method which is capable of creating coded data of high-quality with no discontinuity in real time without being affected by processing ability of a CPU on a personal computer and how much another application occupies processing on the CPU, in a scheme in which a digital audio signal is divided into plural frequency bands and a coding process is performed for each subband. In order to generate bit allocation information for each of plural frequency subbands into which a digital audio signal is divided, employed are a process for performing bit allocation with high efficiency using a relationship of a signal to mask based on a predetermined psychoacoustic model and a process for performing bit allocation with a lower load. According to processing amount information of the CPU which is occupied by a coding process, bit allocation means to-be-used is changed.

Description

technical field [0001] The present invention relates to a sound coding method, a sound coding device, and a data storage medium, and particularly relates to a sound coding method using a sub-band coding method in an MPEG (Motion Picture Experts Group) method, a sound coding device, and a storage method for implementing A data storage medium for a program of the above-mentioned audio coding method. Background technique [0002] In recent years, due to the multimediaization of computers and the popularization of the Internet, on computers (hereinafter referred to as PCs), the environment for replaying animations and sounds such as MPEG has been more complete through software, and the range of use of encoded data such as MPEG has been expanded. . [0003] However, encoders for making encoded data still mainly use expensive hardware. When creating coded data with software, it takes a processing time several times the actual playback time of the video and audio to be coded to e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M7/40G10L19/00H03M7/28H04B1/66
CPCH04B1/665H04B1/667H03M7/28
Inventor 河原荣治
Owner PANASONIC CORP