Audio encoder and decoder and methods for encoding and decoding an audio signal

An audio signal encoding and audio encoder technology, applied in the field of audio signal encoding and decoding, can solve problems such as unnaturalness, and achieve the effect of improving synthesis and low bandwidth requirements

Active Publication Date: 2013-03-20
TELEFON AB LM ERICSSON (PUBL)
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  • Audio encoder and decoder and methods for encoding and decoding an audio signal
  • Audio encoder and decoder and methods for encoding and decoding an audio signal
  • Audio encoder and decoder and methods for encoding and decoding an audio signal

Examples

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[0042] figure 1 The codec system 100 is shown schematically, including a first user equipment 105a with an encoder 110 and a second user equipment 105b with a decoder 112. In some implementations, the user equipment 105a / b can include an encoder 110 and a decoder 112. Usually when referring to any user equipment, the label 105 will be used.

[0043] The encoder 110 is configured to receive an input audio signal 115 and encode the input signal 115 into a compressed audio signal representation 120. On the other hand, the decoder 112 is configured to receive the audio signal representation 120 and decode the audio signal representation 120 into a synthesized audio signal 125, which is therefore a reproduction of the input audio signal 115. The input audio signal 115 is generally divided into a sequence of input signal segments by the encoder 110 or by other devices before the signal reaches the encoder 110, and the encoding / decoding performed by the encoder 110 / decoder 112 is gene...

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Abstract

The present invention relates to a frequency domain based method of encoding and decoding an audio signal, wherein an adaptive spectral code book is updated with synthesized frequency domain representations of a time domain signal segment. A frequency analysis is performed of a received time domain signal segment in order to obtain a frequency domain representation, and the adaptive spectral code book is searched for a first approximation of the frequency domain representation. A fixed spectral code book is searched for an approximation of the residual frequency representation. A synthesized frequency domain representation may be generated from the two approximations.

Description

technical field [0001] The invention relates to the field of audio signal coding and decoding. Background technique [0002] Mobile communication systems present a challenging environment for voice delivery services. Voice calls can be made virtually anywhere, and ambient background noise and acoustic conditions will have an impact on the quality and intelligibility of the transmitted speech. At the same time, there is a strong incentive to limit the transmission resources consumed by each communication device. Mobile communication services therefore employ compression techniques in order to reduce the transmission bandwidth consumed by voice signals. Low bandwidth consumption results in low power consumption in both the mobile device and the base station. This translates into energy and cost savings for mobile operators, while end users will experience extended power life and increased talk time. Furthermore, with less bandwidth consumed per user, mobile networks are ab...

Claims

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Application Information

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IPC IPC(8): G10L19/12G10L19/00G10L19/038G10L19/06
CPCG10L2019/0005G10L19/038G10L19/12G10L2019/0002G10L19/06G10L19/13
Inventor E.诺韦尔S.布鲁恩H.波布洛特
Owner TELEFON AB LM ERICSSON (PUBL)
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