Bit stream transmission device, bit stream reception/transmission system, bit stream reception device, bit stream transmission method, bit stream reception method, and bit stream

Abstract

A bit stream transmission device (200) according to the present invention is provided with: an input unit (100) which acquires an elementary audio stream obtained by encoding an audio signal; an analysis unit (101) for analysing the sampling frequency and encoding form of the elementary audio stream (300); a preamble generation unit (102) which, if the analysed sampling frequency and encoding form do not conform to a standard, generates a preamble signal describing an encoding form that conforms to the standard as information indicating the encoding form for the elementary audio stream (300); and a forming unit (103) for forming an audio bit stream (301) in compliance with the standard, by incorporating the generated preamble signal in the elementary audio stream (300).

Description

technical field [0001] The present invention relates to a bit stream transmitting and receiving system including a bit stream transmitting device that transmits a compression-coded audio signal to another device, and a receiving device that receives the audio signal transmitted from the bit stream transmitting device and outputs audio. Background technique [0002] Conventionally, a kind of data reproducing device is well known, and this data reproducing device reads the video signal and audio signal that are compressed and encoded and recorded from recording media such as CD-ROM, DVD-ROM, semiconductor memory, and hard disk, and converts The read video signal and audio signal are decoded (expanded) and output. Then, the data reproduction device transmits the expanded data to a video monitor, an audio speaker, etc. connected to the data reproduction device. Accordingly, reproduction of video and audio is realized. Furthermore, when reproducing digital broadcasting, the dat...

AI Technical Summary

Problems solved by technology

[0029] like Figure 10 It is shown that, in the case where the AAC sampling rate is 16kHz, 22.05kHz, 24kHz, and the audio encoding data format is AAC, the bit stream standard is not defined ( Figure 10 Rows 1 to 3 from above)

Also, when the AAC sampling rate is 32kHz, 44.1kHz, and the audio encoding data format is HEAAC (SBR information is added to the AAC encoding signal), the bit stream standard is not defined ( Figure 10 lines 4 to 5 of

In particular, in the case of the latter, that is, the AAC sampling rate is 32kHz, 44.1kHz, and the audio coded data format is HEAAC, although the operation of digital broadcasting, etc. is stipulated, the bit stream standard is not defined.

As a result, there is a problem that even if a high-quality elementary audio stream encoded by HEAAC is received, the elementary audio stream cannot be reproduced and enjoyed by an external multi-channel speaker system or the like.

[0030] The second problem is that, for example, in the case where coded data of different forms of audio coded data are contained in the same content, the switching of the output sampling frequency in the output bit stream increases

Moreover, this process takes time, and therefore, there is a problem that a sound break occurs during switching between the program part and the commercial part.

Images