Decoder with embedded silence and background noise compression
View Patent ↗There is provided a method for use by a speech encoder to encode an input speech signal. The method comprises receiving the input speech signal; determining whether the input speech signal includes an active speech signal or an inactive speech signal; low-pass filtering the inactive speech signal to generate a narrowband inactive speech signal; high-pass filtering the inactive speech signal to generate a high-band inactive speech signal; encoding the narrowband inactive speech signal using a narrowband inactive speech encoder to generate an encoded narrowband inactive speech; generating a low-to-high auxiliary signal by the narrowband inactive speech encoder based on the narrowband inactive speech signal; encoding the high-band inactive speech signal using a wideband inactive speech encoder to generate an encoded wideband inactive speech based on the low-to-high auxiliary signal from the narrowband inactive speech encoder; and transmitting the encoded narrowband inactive speech and the encoded wideband inactive speech.
1. A method of decoding a narrowband inactive speech and a wideband inactive speech for generating an inactive speech, the method comprising:
receiving the narrowband inactive speech;
receiving the wideband inactive speech;
generating a first auxiliary signal by a narrowband inactive speech decoder based on the narrowband inactive speech;
generating a second auxiliary signal by a wideband inactive speech decoder based on the wideband inactive speech;
decoding the narrowband inactive speech using the narrowband inactive speech decoder to generate a decoded narrowband inactive speech based on the second auxiliary signal;
decoding the wideband inactive speech using the wideband inactive speech decoder to generate a decoded wideband inactive speech based on the first auxiliary signal; and
constructing the inactive speech using the decoded narrowband inactive speech and the decoded wideband inactive speech.
2. The method of claim 1 , wherein the narrowband inactive speech is a G.729B bitstream in accordance with ITU-T G.729 Annex B Recommendation, and the wideband inactive speech is a wideband base layer bitstream following the G.729B bitstream.
3. The method of claim 2 further comprising:
receiving an enhanced narrowband base layer bitstream encoded in the narrowband inactive speech following the wideband base layer bitstream; and
decoding the narrowband inactive speech to generate the enhanced narrowband base layer bitstream.
4. The method of claim 3 further comprising:
receiving an enhanced wideband base layer bitstream encoded in the wideband inactive speech following the enhanced narrowband base layer bitstream; and
decoding the wideband inactive speech to generate the enhanced wideband base layer bitstream.
5. The method of claim 3 further comprising:
receiving an enhanced wideband base layer bitstream encoded in the wideband inactive speech following the wideband base layer bitstream; and
decoding the wideband inactive speech signal to generate the enhanced wideband base layer bitstream.
6. The method of claim 5 further comprising:
receiving an enhanced narrowband base layer bitstream encoded in the narrowband inactive speech following the enhanced wideband base layer bitstream; and
decoding the narrowband inactive speech signal to generate the enhanced narrowband base layer bitstream.
7. A speech decoder adapted to decode a narrowband inactive speech and a wideband inactive speech for generating an inactive speech, the speech decoder comprising:
a microprocessor configured to:
receive the narrowband inactive speech;
receive the wideband inactive speech;
generate a first auxiliary signal by a narrowband inactive speech decoder based on the narrowband inactive speech;
generate a second auxiliary signal by a wideband inactive speech decoder based on the wideband inactive speech;
decode the narrowband inactive speech using the narrowband inactive speech decoder to generate a decoded narrowband inactive speech based on the second auxiliary signal;
decode the wideband inactive speech using the wideband inactive speech decoder to generate a decoded wideband inactive speech based on the first auxiliary signal; and
construct the inactive speech using the decoded narrowband inactive speech and the decoded wideband inactive speech.
8. The speech decoder of claim 7 , wherein the narrowband inactive speech is a G.729B bitstream in accordance with ITU-T G.729 Annex B Recommendation, and the wideband inactive speech is a wideband base layer bitstream following the G.729B bitstream.
9. The speech decoder of claim 7 , wherein the microprocessor is configured to:
receive an enhanced narrowband base layer bitstream encoded in the narrowband inactive speech following the wideband base layer bitstream; and
decode the narrowband inactive speech to generate the enhanced narrowband base layer bitstream.
10. The speech decoder of claim 9 , wherein the microprocessor is configured to:
receive an enhanced wideband base layer bitstream encoded in the wideband inactive speech following the enhanced narrowband base layer bitstream; and
decode the wideband inactive speech to generate the enhanced wideband base layer bitstream.
11. The speech decoder of claim 9 , wherein the microprocessor is configured to:
receive an enhanced wideband base layer bitstream encoded in the wideband inactive speech following the wideband base layer bitstream; and
decode the wideband inactive speech signal to generate the enhanced wideband base layer bitstream.
12. The speech decoder of claim 11 , wherein the microprocessor is configured to:
receive an enhanced narrowband base layer bitstream encoded in the narrowband inactive speech following the enhanced wideband base layer bitstream; and
decode the narrowband inactive speech signal to generate the enhanced narrowband base layer bitstream.