# US 10,373,624 B2 · Broadband signal generating method and apparatus, and device employing same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,373,624 B2 - Document ID: US10373624B2 - Status: Granted - Kind: B2 - Application number: 15/033,834 - Filed: 2014-11-03 - Published: 2016-09-22 - Granted: 2019-08-06 - Earliest claimed: 2013-11-02 - Assignees: Samsung Electronics Co., Ltd.; Industry-University Cooperation Foundation Hanyang University Erica Campus - Applicants: Samsung Electronics Co., Ltd.; Industry-University Cooperation Foundation Hanyang University Erica Campus - Inventors: Ki-Hyun Choo; Sang-won Kang; Ho-sang Sung; Eun-mi Oh; Jong-geun Jeon; Yaxing Li - Web page: https://patentgrep.com/patent/US10373624B2 ## CPC - G10L 19/087: using mixed excitation models, e.g. MELP, MBE, split band LPC or HVXC - G10L 19/09: Long term prediction, i.e. removing periodical redundancies, e.g. by using adaptive codebook or pitch predictor - G10L 19/167: {Audio streaming, i.e. formatting and decoding of an encoded audio signal representation into a data stream for transmission or storage purposes} - G10L 21/038: using band spreading techniques - G10L 2019/0016: {Codebook for LPC parameters} - G10L: SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING ## Abstract A method of generating a wideband signal may include estimating a high-band spectrum parameter from a reconstructed narrowband signal based on a combination of at least two mapping schemes; estimating a high-band excitation signal based on the reconstructed narrowband signal; generating a high-band signal based on the estimated high-band spectrum parameter and the estimated high-band excitation signal; and generating a wideband signal by synthesizing the reconstructed narrowband signal with the high-band signal. ## Claims ### Claim 1 A method of generating a wideband signal in a decoding device, the method comprising: estimating a high-band spectrum parameter from a reconstructed narrowband signal, based on a combination of at least two mapping schemes; estimating a high-band excitation signal from the reconstructed narrowband signal; generating a high-band signal based on the estimated high-band spectrum parameter and the estimated high-band excitation signal; and generating 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. ### Claim 2 (depends on 1) The method of claim 1, wherein, the estimating of the high-band excitation signal comprises whitening the reconstructed narrowband signal and estimating the high-band excitation signal based on the whitened narrowband signal. ### Claim 3 (depends on 1) The method of claim 1, wherein a narrowband codebook and a corresponding high-band codebook which are dual-structured are used for the codebook mapping scheme. ### Claim 4 (depends on 1) The method of claim 1, wherein the estimating of the high-band spectrum parameter comprises: obtaining a first extended spectrum parameter from the reconstructed narrowband signal, based on codebook mapping using a narrowband codebook and a corresponding high-band codebook; obtaining a second extended spectrum parameter by linearly mapping the reconstructed narrowband signal, based on information provided as a result of the codebook mapping; and selecting either the first extended spectrum parameter or the second extended spectrum parameter as the high-band spectrum parameter. ### Claim 5 (depends on 4) The method of claim 4, wherein, in the selecting of the high-band spectrum parameter, the first extended spectrum parameter and the second extended spectrum parameter are compared to the reconstructed narrowband signal and one with less distortion is selected. ### Claim 6 (depends on 1) A non-transitory computer readable recording medium having recorded thereon a computer program for implementing the method of any claim 1. ### Claim 7 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. ### Claim 8 (depends on 7) The wideband signal generating apparatus of claim 7, wherein the high-band signal generator estimates the high-band envelope signal based on a combination of the linear mapping scheme and the codebook mapping scheme using a narrowband codebook and a corresponding high-band codebook which are dual-structured. ### Claim 9 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. ### Claim 10 (depends on 9) The multimedia device of claim 9, wherein the high-band signal generator estimates the high-band envelope signal based on a combination of the linear mapping scheme and the codebook mapping scheme using a narrowband codebook and a corresponding high-band codebook which are dual-structured. ### Claim 11 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. ### Claim 12 (depends on 11) The headset of claim 11 further comprising a switch for determining whether to operate the apparatus based on a user input. ### Claim 13 (depends on 11) The headset of claim 11, wherein the high-band signal generator estimates the high-band envelope signal based on a combination of the linear mapping scheme and the codebook mapping scheme using a narrowband codebook and a corresponding high-band codebook which are dual-structured. ### Claim 14 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. ### Claim 15 (depends on 14) The speaker of claim 14 further comprising a switch for determining whether to operate the apparatus based on a user input. ### Claim 16 (depends on 14) The speaker of claim 14, wherein the high-band signal generator estimates the high-band envelope signal based on a combination of the linear mapping scheme and the codebook mapping scheme using a narrowband codebook and a corresponding high-band codebook which are dual-structured.