Audio coding format

Abstract: The invention provides a layered audio coding format with a monophonic layer and at least one sound field layer. A plurality of audio signals is decomposed, in accordance with decomposition parameters controlling the quantitative properties of an orthogonal energy-compacting transform, into rotated audio signals. Further, a time-variable gain profile specifying constructively how the rotated audio signals may be processed to attenuate undesired audio content is derived. The monophonic layer may comprise one of the rotated signals and the gain profile. The sound field layer may comprise the rotated signals and the decomposition parameters. In one embodiment, the gain profile comprises a cleaning gain profile with the main purpose of eliminating non-speech components and/or noise. The gain profile may also comprise mutually independent broadband gains. Because signals in the audio coding format can be mixed with a limited computational effort, the invention may advantageously be applied in a tele-conferencing application.

Abstract: The invention provides a layered audio coding format with a monophonic layer and at least one sound field layer. A plurality of audio signals is decomposed, in accordance with decomposition parameters controlling the quantitative properties of an orthogonal energy-compacting transform, into rotated audio signals. Further, a time-variable gain profile specifying constructively how the rotated audio signals may be processed to attenuate undesired audio content is derived. The monophonic layer may comprise one of the rotated signals and the gain profile. The sound field layer may comprise the rotated signals and the decomposition parameters. In one embodiment, the gain profile comprises a cleaning gain profile with the main purpose of eliminating non-speech components and/or noise. The gain profile may also comprise mutually independent broadband gains. Because signals in the audio coding format can be mixed with a limited computational effort, the invention may advantageously be applied in a tele-conferencing application.

Abstract: The invention discloses an IPTV system, an audio/video coding switching method and equipment, wherein the audio/video coding switching method comprises the following steps of: analyzing out multiple paths of audio code streams and video code streams in different coded formats of a current television program from a received transport stream and respectively storing the code streams to an audio code stream database and a video code stream database; when an indicator signal sent by a user for selecting an audio coding format or a video coding format is received, controlling to acquire an audio code stream and a video code stream with coding formats corresponding to the coding format of the indictor signal from the audio code stream database or the video code stream database and controlling to transmit the video code stream and the video code stream to a decoder for processing. The invention provides a favorable condition for users to customize a digital television service, and the users can select different audio coding formats according to different use environments or external equipment so as to achieve a better digital television watching effect.

Abstract: The invention discloses an audio data transmission method and device, and belongs to the field of data transmission The audio data transmission method comprises the steps that a first strategy adjusting request transmitted by playing equipment is received, and the audio sampling frequency parameter and the audio coding format parameter included in the first strategy adjusting request are acquired; the sampling parameter of a microphone is adjusted according to the audio sampling frequency parameter, and the recording data are acquired through the microphone; audio mixing is performed on the recording data and accompaniment data so as to obtain the audio data; the audio data are coded according to the corresponding coding mode of the audio coding format parameter so as to obtain the audio data stream; and the audio data stream is transmitted to the playing equipment The problems that the user cannot karaoke as the way he wants anytime and anywhere due to the fact that karaoke requires to be supported by a set of professional hardware equipment in the related technologies can be solved, and the effects that the hardware requirements required for karaoke can be reduced and the user is enabled to karaoke anytime and anywhere can be achieved