Bit rate allocation method and bit rate allocation device in digital audio coding

• Main Authors: WANG LEI, YAN JIANXIN
• Format: Patent
• Language: Chinese; English
• Published: 10.05.2017
• Subjects: ACOUSTICS; MUSICAL INSTRUMENTS; PHYSICS; SPEECH ANALYSIS OR SYNTHESIS; SPEECH OR AUDIO CODING OR DECODING; SPEECH OR VOICE PROCESSING; SPEECH RECOGNITION

The invention relates to a bit rate allocation method and a bit rate allocation device in digital audio coding. The bit rate allocation method includes selecting a group of specific adjustment coefficients to subject mask thresholds of low-frequency and high-frequency sub-bands in one sound channel to adaptive adjustment so as to achieve adaptive bit rate allocation in the sound channel. According to the method, adaptive bit rate allocation among sound channels is achieved according to characteristics of every sound channel, and a specific weight coefficient is selected to subject the mask thresholds of the mixed high-frequency signals to adaptive adjustment so as to achieve adaptive bit rate allocation during intensity stereo coding. By the adaptive bit rate allocation method, better subjective sound quality can be obtained. 本发明涉及数字音频编码中码率分配的方法和装置。所述方法选择组特定的调整系数对个声道内从低频到高频各子带的掩蔽门限进行自适应调整以实现声道内的自适应码率分配，所述方法根据各个声道的特性进行声道间的自适应码率分配，所述方法选择特定的权重系数对混合的高频信号部分的掩蔽门限进行自适应调整以实现强度立体声编码时的自适应码率分配。通过这些自适应码率分配方法，本发明可以获得更好的主观