Broadband signal generating method and apparatus, and device employing same

A wideband signal generating apparatus in a decoding device, the apparatus comprising:

• a high-band signal generator, implemented by at least one processor, which estimates a high-band envelope signal from a reconstructed narrowband signal, based on a combination of at least two mapping schemes, estimates a high-band excitation signal based on a signal obtained by whitening the reconstructed narrowband signal, and generates a high-band signal based on the estimated high-band envelope signal and the estimated high-band excitation signal;
• and
• a synthesizer, implemented by the at least one processor, which generates a wideband signal for reproduction, by synthesizing the reconstructed narrowband signal with the generated high-band signal,
• wherein the at least two mapping schemes comprise a codebook mapping scheme and a linear mapping scheme, and
• wherein the high-band signal generator comprises:
• a spectrum parameter estimator, which generates a corresponding high-band LPC coefficient from a narrowband LPC coefficient obtained as a result of performing a LP analysis on the reconstructed narrowband signal, so as to estimate the high-band envelope signal;
• and
• an excitation estimator, which generates the high-band excitation signal from the reconstructed narrowband signal based on a whitened excitation signal obtained by filtering the narrowband LPC coefficient.

A multimedia device comprising:

• a narrowband decoder, implemented by at least one processor, which generates a reconstructed narrowband signal by decoding a narrowband bitstream;
• and
• a wideband signal generating apparatus in a decoding device, the apparatus comprising:
• a high-band signal generator, implemented by the at least one processor, which estimates a high-band envelope signal from a reconstructed narrowband signal, based on a combination of at least two mapping schemes, estimates a high-band excitation signal based on a signal obtained by whitening the reconstructed narrowband signal, and generates a high-band signal based on the estimated high-band envelope signal and the estimated high-band excitation signal;
• and
• a synthesizer, implemented by the at least one processor, which generates a wideband signal for reproduction, by synthesizing the reconstructed narrowband signal with generated the high-band signal,
• wherein the at least two mapping schemes comprise a codebook mapping scheme and a linear mapping scheme, and
• wherein the high-band signal generator comprises:
• a spectrum parameter estimator, which generates a corresponding high-band LPC coefficient from a narrowband LPC coefficient obtained as a result of performing a LP analysis on the reconstructed narrowband signal, so as to estimate the high-band envelope signal;
• and
• an excitation estimator, which generates the high-band excitation signal from the reconstructed narrowband signal based on a whitened excitation signal obtained by filtering the narrowband LPC coefficient.

A headset with a wideband signal generating apparatus in a decoding device, the apparatus comprising:

• a high-band signal generator, implemented by at least one processor, which estimates a high-band envelope signal from a reconstructed narrowband signal, based on a combination of at least two mapping schemes, estimates a high-band excitation signal based on a signal obtained by whitening the reconstructed narrowband signal, and generates a high-band signal based on the estimated high-band envelope signal and the estimated high-band excitation signal;
• and
• a synthesizer implemented by the at least one processor, which generates a wideband signal for reproduction, by synthesizing the reconstructed narrowband signal with the generated high-band signal,
• wherein the at least two mapping schemes comprise a codebook mapping scheme and a linear mapping scheme, and
• wherein the estimating of the high-band spectrum parameter comprises mapping a narrowband LPC coefficient obtained from the reconstructed narrowband signal to a corresponding high-band LPC coefficient, by using the combination of the at least two mapping schemes.

A speaker with a wideband signal generating apparatus in a decoding device, the apparatus comprising:

• a high-band signal generator implemented by at least one processor, which estimates a high-band envelope signal from a reconstructed narrowband signal, based on a combination of at least two mapping schemes, estimates a high-band excitation signal based on a signal obtained by whitening the reconstructed narrowband signal, and generates a high-band signal based on the estimated high-band envelope signal and the estimated high-band excitation signal;
• and
• a synthesizer, implemented by the at least one processor, which generates a wideband signal for reproduction, by synthesizing the reconstructed narrowband signal with the generated high-band signal,
• wherein the at least two mapping schemes comprise a codebook mapping scheme and a linear mapping scheme, and
• wherein the estimating of the high-band spectrum parameter comprises mapping a narrowband LPC coefficient obtained from the reconstructed narrowband signal to a corresponding high-band LPC coefficient, by using the combination of the at least two mapping schemes.