公开(公告)号：WO1997037449A1

公开(公告)日：1997-10-09

申请号：PCT/US1997005141

申请日：1997-03-28

Applicant: COMMAND AUDIO CORPORATION

Inventor： COMMAND AUDIO CORPORATION ,  MORRISON, Eric, F.

IPC: H04H05/00

CPC classification number: H04H20/88

Abstract: The data rate of speech and non-speech audio is selectively reduced by respective compression techniques based upon the information content of the type of signal. A composite audio information signal formed of speech and non-speech audio is applied to both a voice encoder and a wide-band audio compression encoder. An audio-type detection circuit examines the speech spectrum as well as the entire frequency spectrum and dynamic range of the audio information and generates a selection signal indicating whether the signal is speech or non-speech audio. A composite encoded audio signal is produced by intermingling the outputs of the encoders in response to the selection signal. The composite encoded audio signal and an identification signal indicative of the audio signal type are transmitted to respective receivers at the reduced data rates for storage, and subsequent decoding and retrieval by a listener as an audible signal in response to the transmitted identification signal.

Abstract translation: 基于信号类型的信息内容，通过各自的压缩技术选择性地减少语音和非语音音频的数据速率。 由语音和非语音音频形成的复合音频信息信号被应用于语音编码器和宽带音频压缩编码器。 音频类型检测电路检查语音频谱以及音频信息的整个频谱和动态范围，并产生指示信号是语音还是非语音音频的选择信号。 通过根据选择信号混合编码器的输出来产生复合编码音频信号。 复合编码音频信号和指示音频信号类型的识别信号以降低的数据速率发送到各个接收机用于存储，并且随后由收听者解码和检索响应于所发送的识别信号的可听信号。