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The traditional steady-state visual evoked potential (SSVEP) brain computer interface system usually uses a small number of frequencies for encoding, resulting in a limited number of encodings to dozens, which cannot meet the demands of environmental tasks with a large number of instructions. To address this issue, a Hamming distance multi frequency code (HDMFC) paradigm and corresponding recognition algorithm based on Hamming distance were proposed. The Hamming distance was combined with stimulus paradigm encoding and signal recognition algorithms to encode 120 instructions using 8 frequency signals. Data collection and classification experiments were conducted on 7 subjects. The results show that the accuracy of the 120 encoding online experiment based on Hamming distance can reach 90.60%. The research results provide an effective method for increasing the number of SSVEP paradigm codes and improving classification performance, verifying the practicality and effectiveness of Hamming distance in this field.
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传统的稳态视觉诱发电位(steady-state visual evoked potential,SSVEP)脑机接口系统通常使用少量频率进行编码,导致编码数量限制在几十个,无法满足有大量指令需求的环境作业。为了解决这一问题,提出一种基于海明距离的多频编码(Hamming distance multi-frequency code,HDMFC)范式及相应的识别算法,将海明距离同刺激范式编码和信号识别算法结合,利用8个频率信号可编码120个指令,并对7名受试者进行数据采集和分类实验。结果表明,基于海明距离的120编码在线实验准确率可达90.60%。研究成果为SSVEP范式编码数量的增加和分类效果的提升提供了有效的方法,验证了海明距离在这一领域的实用性和有效性。
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赵耀(1998—),男,汉族,山西临汾人,硕士。研究方向:脑机接口。E-mail:1195092235@qq.com。
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赵耀(1998—),男,汉族,山西临汾人,硕士。研究方向:脑机接口。E-mail:1195092235@qq.com。
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HDMFC stimulation interface, figureFileSmall=SMwRdf0g4bMgKrnZbyTrhA==, figureFileBig=J17bnSeiWtvZc7HPCbHDDA==, tableContent=null), ArticleFig(id=1179811190466294414, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149774731274056389, language=CN, label=图1, caption=
HDMFC刺激界面 在编码过程中使用1~8的8个数字以及A~L的12个字母进行编码,每个数字和字母分别代表一个频率信号
, figureFileSmall=SMwRdf0g4bMgKrnZbyTrhA==, figureFileBig=J17bnSeiWtvZc7HPCbHDDA==, tableContent=null), ArticleFig(id=1179811190541791887, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149774731274056389, language=EN, label=Fig.2, caption=
HDMFC encoding table, figureFileSmall=XNXmdxlJMtHVUmmPPUdrpg==, figureFileBig=cM22erV9uKSYT8fgk6nWRg==, tableContent=null), ArticleFig(id=1179811190600512144, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149774731274056389, language=CN, label=图2, caption=
HDMFC编码表 A~L表示基频信号
, figureFileSmall=XNXmdxlJMtHVUmmPPUdrpg==, figureFileBig=cM22erV9uKSYT8fgk6nWRg==, tableContent=null), ArticleFig(id=1179811190659232401, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149774731274056389, language=EN, label=Fig.3, caption=
Signal recognition process, figureFileSmall=u21P0NmOYHa/m7FdKoKwOg==, figureFileBig=QTfplkE/EKVCQnTDR1B89g==, tableContent=null), ArticleFig(id=1179811190722146962, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149774731274056389, language=CN, label=图3, caption=
信号识别流程, figureFileSmall=u21P0NmOYHa/m7FdKoKwOg==, figureFileBig=QTfplkE/EKVCQnTDR1B89g==, tableContent=null), ArticleFig(id=1179811190776672915, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149774731274056389, language=EN, label=Fig.4, caption=
HDMFC performance before and after optimization, figureFileSmall=1BtEnQXk6yN7GcFONRskdw==, figureFileBig=hBoODJM54zHBRrduUtiVtg==, tableContent=null), ArticleFig(id=1179811190827004564, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149774731274056389, language=CN, label=图4, caption=
优化前后HDMFC性能 HDMFC*Opt表示使用编码优化算法优化编码集后不进行纠错(只使用FBCCA算法识别)的准确率;HDMFC Opt 表示使用编码优化算法优化编码集且使用纠错算法(所提出的基于海明距离的识别算法,该算法在FBCCA的基础上增加纠错)的准确率;HDMFC*Ran表示随机选择编码集后不进行纠错(只使用FBCCA算法识别)的准确率;HDMFC Ran表示随机选择编码集后使用纠错算法(所提出的基于海明距离的识别算法,该算法在FBCCA的基础上增加纠错)的准确率
, figureFileSmall=1BtEnQXk6yN7GcFONRskdw==, figureFileBig=hBoODJM54zHBRrduUtiVtg==, tableContent=null), ArticleFig(id=1179811190881530517, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149774731274056389, language=EN, label=Fig.5, caption=
Accuracy of HDMFC under Different Time Windows, figureFileSmall=gYArFH7SON9pDu7/LP9/WQ==, figureFileBig=d6G/xnoULmlHjypbzYTwIQ==, tableContent=null), ArticleFig(id=1179811190990582422, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149774731274056389, language=CN, label=图5, caption=
不同时间窗下HDMFC的准确率 *表示不进行纠错(使用FBCCA算法识别)的准确率
, figureFileSmall=gYArFH7SON9pDu7/LP9/WQ==, figureFileBig=d6G/xnoULmlHjypbzYTwIQ==, tableContent=null), ArticleFig(id=1179811191057691287, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149774731274056389, language=EN, label=Table 1, caption=
Accuracy of different time window lengths
, figureFileSmall=null, figureFileBig=null, tableContent=
| 被试 | 不同时间窗长下的准确率(ACC)/% |
| 0.4 s | 0.6 s | 0.8 s | 1 s |
| S1 | 91.70 | 98.30 | 96.70 | 100.00 |
| S2 | 73.30 | 75.00 | 85.00 | 90.00 |
| S3 | 81.70 | 91.70 | 96.70 | 100.00 |
| S4 | 96.70 | 98.30 | 100.00 | 100.00 |
| S5 | 56.70 | 88.30 | 96.70 | 93.30 |
| S6 | 70.80 | 84.15 | 92.50 | 93.30 |
| S7 | 72.08 | 87.08 | 90.08 | 92.70 |
| 平均值 | 77.57 | 88.98 | 93.95 | 95.61 |
| 标准差 | 12.61 | 7.60 | 4.73 | 3.94 |
), ArticleFig(id=1179811191116411544, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149774731274056389, language=CN, label=表1, caption=
不同时间窗长的准确率
, figureFileSmall=null, figureFileBig=null, tableContent=
| 被试 | 不同时间窗长下的准确率(ACC)/% |
| 0.4 s | 0.6 s | 0.8 s | 1 s |
| S1 | 91.70 | 98.30 | 96.70 | 100.00 |
| S2 | 73.30 | 75.00 | 85.00 | 90.00 |
| S3 | 81.70 | 91.70 | 96.70 | 100.00 |
| S4 | 96.70 | 98.30 | 100.00 | 100.00 |
| S5 | 56.70 | 88.30 | 96.70 | 93.30 |
| S6 | 70.80 | 84.15 | 92.50 | 93.30 |
| S7 | 72.08 | 87.08 | 90.08 | 92.70 |
| 平均值 | 77.57 | 88.98 | 93.95 | 95.61 |
| 标准差 | 12.61 | 7.60 | 4.73 | 3.94 |
), ArticleFig(id=1179811191187714713, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149774731274056389, language=EN, label=Table 2, caption=
Accuracy of HDMFC in different frequency bands
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| 被试 | 准确率/% |
| 8~15 Hz | 11~19 Hz |
| S1 | 78.33 | 88.33 |
| S2 | 83.33 | 89.17 |
| S3 | 85.00 | 90.83 |
| S4 | 90.83 | 96.67 |
| S5 | 73.33 | 79.16 |
| S6 | 71.67 | 78.33 |
| S7 | 81.67 | 90.83 |
| 平均值 | 80.59 | 87.62 |
| 标准差 | 6.21 | 6.13 |
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不同频段下HDMFC的准确率
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| 被试 | 准确率/% |
| 8~15 Hz | 11~19 Hz |
| S1 | 78.33 | 88.33 |
| S2 | 83.33 | 89.17 |
| S3 | 85.00 | 90.83 |
| S4 | 90.83 | 96.67 |
| S5 | 73.33 | 79.16 |
| S6 | 71.67 | 78.33 |
| S7 | 81.67 | 90.83 |
| 平均值 | 80.59 | 87.62 |
| 标准差 | 6.21 | 6.13 |
), ArticleFig(id=1179811191326126747, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149774731274056389, language=EN, label=Table 3, caption=
Online experimental results of HDMFC paradigm
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| 被试 | ACC/% |
| HDMFC-2* | HDMFC-2 | HDMFC-3* | HDMFC-3 |
| S1 | 70.83 | 87.50 | 67.50 | 90.00 |
| S2 | 66.67 | 86.67 | 60.00 | 85.83 |
| S3 | 85.00 | 83.33 | 73.33 | 98.33 |
| S4 | 94.17 | 100.00 | 86.67 | 96.67 |
| S5 | 63.33 | 86.67 | 56.67 | 83.33 |
| S6 | 80.00 | 98.33 | 54.17 | 85.00 |
| S7 | 88.33 | 91.67 | 62.50 | 89.17 |
| 平均值 | 72.50 | 90.60 | 65.83 | 89.76 |
| 标准差 | 10.41 | 5.89 | 10.41 | 5.36 |
), ArticleFig(id=1179811191393235612, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149774731274056389, language=CN, label=表3, caption=
HDMFC范式在线实验结果
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| 被试 | ACC/% |
| HDMFC-2* | HDMFC-2 | HDMFC-3* | HDMFC-3 |
| S1 | 70.83 | 87.50 | 67.50 | 90.00 |
| S2 | 66.67 | 86.67 | 60.00 | 85.83 |
| S3 | 85.00 | 83.33 | 73.33 | 98.33 |
| S4 | 94.17 | 100.00 | 86.67 | 96.67 |
| S5 | 63.33 | 86.67 | 56.67 | 83.33 |
| S6 | 80.00 | 98.33 | 54.17 | 85.00 |
| S7 | 88.33 | 91.67 | 62.50 | 89.17 |
| 平均值 | 72.50 | 90.60 | 65.83 | 89.76 |
| 标准差 | 10.41 | 5.89 | 10.41 | 5.36 |
), ArticleFig(id=1179811191464538781, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149774731274056389, language=EN, label=Table 4, caption=
Comparison of accuracy between HDMFC-2 and DFBC
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| 被试 | ACC/% |
| HDMFC-2* | HDMFC-2 | DFBC* | DFBC |
| S1 | 69.17 | 86.67 | 41.67 | 56.95 |
| S2 | 68.33 | 90.00 | 72.92 | 81.95 |
| S3 | 86.67 | 95.00 | 74.30 | 85.42 |
| S4 | 92.50 | 99.17 | 77.08 | 55.42 |
| S5 | 65.00 | 85.83 | 91.67 | 83.75 |
| S6 | 59.17 | 80.00 | 90.97 | 93.33 |
| S7 | 64.17 | 88.33 | 70.83 | 68.75 |
| 平均值 | 72.14 | 89.29 | 79.27 | 71.55 |
| 标准差 | 11.54 | 5.82 | 5.89 | 11.95 |
), ArticleFig(id=1179811191544230558, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149774731274056389, language=CN, label=表4, caption=
HDMFC-2与DFBC的准确率比较
, figureFileSmall=null, figureFileBig=null, tableContent=
| 被试 | ACC/% |
| HDMFC-2* | HDMFC-2 | DFBC* | DFBC |
| S1 | 69.17 | 86.67 | 41.67 | 56.95 |
| S2 | 68.33 | 90.00 | 72.92 | 81.95 |
| S3 | 86.67 | 95.00 | 74.30 | 85.42 |
| S4 | 92.50 | 99.17 | 77.08 | 55.42 |
| S5 | 65.00 | 85.83 | 91.67 | 83.75 |
| S6 | 59.17 | 80.00 | 90.97 | 93.33 |
| S7 | 64.17 | 88.33 | 70.83 | 68.75 |
| 平均值 | 72.14 | 89.29 | 79.27 | 71.55 |
| 标准差 | 11.54 | 5.82 | 5.89 | 11.95 |
), ArticleFig(id=1179811191607145119, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149774731274056389, language=EN, label=Table 5, caption=
Comparison of accuracy between HDMFC-3 and DFBC
, figureFileSmall=null, figureFileBig=null, tableContent=
| 被试 | ACC/% |
| HDMFC-3* | HDMFC-3 | DFBC* | DFBC |
| S1 | 65.00 | 88.33 | 41.67 | 56.95 |
| S2 | 58.33 | 85.83 | 72.92 | 81.95 |
| S3 | 82.50 | 95.00 | 74.30 | 85.42 |
| S4 | 77.50 | 96.67 | 77.08 | 55.42 |
| S5 | 58.33 | 86.67 | 91.67 | 83.75 |
| S6 | 56.67 | 81.66 | 90.97 | 93.33 |
| S7 | 57.50 | 85.00 | 70.83 | 68.75 |
| 平均值 | 66.43 | 88.45 | 79.27 | 71.55 |
| 标准差 | 9.83 | 5.05 | 5.89 | 11.95 |
), ArticleFig(id=1179811191670059680, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149774731274056389, language=CN, label=表5, caption=
HDMFC-3与DFBC的准确率比较
, figureFileSmall=null, figureFileBig=null, tableContent=
| 被试 | ACC/% |
| HDMFC-3* | HDMFC-3 | DFBC* | DFBC |
| S1 | 65.00 | 88.33 | 41.67 | 56.95 |
| S2 | 58.33 | 85.83 | 72.92 | 81.95 |
| S3 | 82.50 | 95.00 | 74.30 | 85.42 |
| S4 | 77.50 | 96.67 | 77.08 | 55.42 |
| S5 | 58.33 | 86.67 | 91.67 | 83.75 |
| S6 | 56.67 | 81.66 | 90.97 | 93.33 |
| S7 | 57.50 | 85.00 | 70.83 | 68.75 |
| 平均值 | 66.43 | 88.45 | 79.27 | 71.55 |
| 标准差 | 9.83 | 5.05 | 5.89 | 11.95 |
), ArticleFig(id=1179811191737168545, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149774731274056389, language=EN, label=Table 6, caption=
Comparison of accuracy between HDMFC-3 and MFSC
, figureFileSmall=null, figureFileBig=null, tableContent=
| 被试 | ACC/% |
| HDMFC-2* | HDMFC-2 | HDMFC-3 | MSFC |
| S1 | 69.17 | 86.67 | 88.33 | 65.83 |
| S2 | 68.33 | 90.00 | 85.83 | 70.83 |
| S3 | 86.67 | 95.00 | 95.00 | 83.75 |
| S4 | 92.5 | 99.17 | 96.67 | 93.33 |
| S5 | 65.00 | 85.83 | 86.67 | 62.92 |
| S6 | 59.17 | 80.00 | 81.66 | 55.42 |
| S7 | 64.17 | 88.33 | 85.00 | 68.75 |
| 平均值 | 72.14 | 89.29 | 88.45 | 71.55 |
| 标准差 | 11.54 | 5.82 | 5.05 | 11.95 |
), ArticleFig(id=1179811191812666018, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149774731274056389, language=CN, label=表6, caption=
HDMFC-3与MFSC的准确率比较
, figureFileSmall=null, figureFileBig=null, tableContent=
| 被试 | ACC/% |
| HDMFC-2* | HDMFC-2 | HDMFC-3 | MSFC |
| S1 | 69.17 | 86.67 | 88.33 | 65.83 |
| S2 | 68.33 | 90.00 | 85.83 | 70.83 |
| S3 | 86.67 | 95.00 | 95.00 | 83.75 |
| S4 | 92.5 | 99.17 | 96.67 | 93.33 |
| S5 | 65.00 | 85.83 | 86.67 | 62.92 |
| S6 | 59.17 | 80.00 | 81.66 | 55.42 |
| S7 | 64.17 | 88.33 | 85.00 | 68.75 |
| 平均值 | 72.14 | 89.29 | 88.45 | 71.55 |
| 标准差 | 11.54 | 5.82 | 5.05 | 11.95 |
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