Abstract
Natural language and human–machine interaction is a very much traversed as well as challenging research domain. However, the main objective is of getting the system that can communicate in well-organized manner with the human, regardless of operational environment. In this paper a systematic survey on Automatic Speech Recognition (ASR) for tonal languages spoken around the globe is carried out. The tonal languages of Asian, Indo-European and African continents are reviewed but the tonal languages of American and Austral-Asian are not reviewed. The most important part of this paper is to present the work done in the previous years on the ASR of Asian continent tonal languages like Chinese, Thai, Vietnamese, Mandarin, Mizo, Bodo and Indo-European continent tonal languages like Punjabi, Lithuanian, Swedish, Croatian and African continent tonal languages like Yoruba and Hausa. Finally, the synthesis analysis is explored based on the findings. Many issues and challenges related with tonal languages are discussed. It is observed that the lot of work have been done for the Asian continent tonal languages i.e. Chinese, Thai, Vietnamese, Mandarin but little work been reported for the Mizo, Bodo, Indo-European tonal languages like Punjabi, Latvian, Lithuanian as well for the African continental tonal languages i.e. Hausa and Yourba.
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Appendices
Appendix 1: A Quality Assessment Forms
1.1 Screening Question
Appendix 2: Data items Extracted from All Papers
Data item | Description |
---|---|
Token Initialization | Unique Identifier for the study |
Data source | Author, title year |
Category of article | Article from journal, conference, workshop. |
Study objectives | What are the objectives of the study, i.e., search focus, i.e., the research areas of the research on which the paper focuses. |
Design of study | Category of study—feature extraction, classification, SR, comparative analysis, etc. |
What is the SR technique of tonal languages? | Spoken words are transcribed by the computers into readable text. |
Method of comparison | Important parameters values for SR, i.e., f0, tone, energy, gain, amplitude, power, frequency response, voiced and unvoiced feature |
Data analysis phase | Data analysis with respect to presentation of source, error rate, recognition accuracy |
Tool and the usage | It refers to the SR tool, developer and usage of the tool |
Result of study | Result or conclusions from the primary study |
Appendix 3
- A:
-
Tonal Assimilation
- ACC:
-
Letter Accuracy
- AI:
-
Artificial Intelligence
- AMDF:
-
Average Magnitude Difference Function
- ANN:
-
Artificial Neural Network
- ASR:
-
Automatic Speech Recognition
- ATWV:
-
Actual Term Weighted Value
- BC:
-
Broadcast Conversational
- BCC:
-
Broadcasting Corporation of Chinese
- BLSTM:
-
Bidirectional Long Short Term Memory
- BN:
-
Broadcast News
- BTEC:
-
Basic Travel Expression Corpus
- CAP:
-
Computer Assisted Pronunciation
- CART:
-
Classification And Regression Tree
- CD:
-
Context Dependent
- CD-T-175:
-
Context Dependent Model
- CE:
-
Consonantal Effects
- CER:
-
Character Error Rate
- CI:
-
Context Independent
- CI-T-5:
-
Context Independent Model
- CNN:
-
Convolutional Neural Network
- COR:
-
Letter Correctness
- CPM:
-
Compound Pseudo-Morpheme
- CRF:
-
Conditional Random Field
- CTC:
-
Connectionist Temporal Classification
- CTS:
-
Conversational Telephone Speech
- CV:
-
Consonant Vowel
- D:
-
Declination Normalization
- DBNFs:
-
Deep Bottle Neck Features
- DCTC:
-
Discrete Cosine Transform Coefficient
- DE:
-
Differential Evolution
- DNN:
-
Deep Neural Network
- DR:
-
Detection Rate
- DRT:
-
Diagnostic Rhyme Test
- DTW:
-
Dynamic Time Wrap
- EMG:
-
Electromyography
- ENV:
-
Environment
- F:
-
Average Pitch Value of Whole Utterance
- f0:
-
Fundamental Frequency
- F0:
-
Time Periods of the Successive Human Vocal Cords Vibrations
- FFT:
-
Fast Fourier Transform
- fi:
-
Average Pitch Values of Voiced Segment
- FLP:
-
Full Language Pack
- G2P:
-
Grapheme-to-Phoneme
- GA:
-
Genetic Algorithm
- GFCC:
-
Gammatone Frequency Cepstral Coefficient
- GMBM:
-
Gaussian Mixture Bigram Model
- GMM:
-
Gaussian Mixture Model
- GP:
-
Global Phone
- HCRF:
-
Hidden Conditional Random Field
- HINT:
-
Hearing In Noise Test
- HMM:
-
Hidden Markov Model
- H-T-30:
-
Half-Tone Model
- I2R:
-
Institute for Infocomm Research
- IC:
-
InterCorp
- IF:
-
Initial/Final
- ISDPs:
-
Intra Syllable Dependent Phone Set
- KLT:
-
Karhunen–Loeve Transformation
- KNN:
-
Nearest Neighbors
- KWS:
-
Keyword Search
- KWS:
-
Keyword Spotting
- LCR:
-
Letter Correct Rate
- LDA:
-
Linear Discriminant Analysis
- LM:
-
Language Model
- LM_DP_MI:
-
Language Model with Dynamic Programming Word Segmentation Method
- LM_MM:
-
Language Model with Polysyllabic Words with Maximum Matching
- LM1:
-
Closed Type Model
- LM2:
-
Mix Type Model
- LM3:
-
Open Type Model
- LOTUS:
-
Large Vocabulary Thai Continuous Speech
- LPCC:
-
Linear Predictive Cepstral Coefficient
- LPM:
-
Latent Prosody Model
- LR:
-
Logistic Regression
- LRN 0.1:
-
Lithuanian Radio News Prototype Version 0.1
- LRN1:
-
Lithuanian Radio News Version 1
- LSTM:
-
Long Short-Term Memory
- LSTM-OP:
-
Long Short-Term Memory with Output Projection
- LSTMP:
-
Long Short-Term Memory Projected
- LVCSR:
-
Large Vocabulary Continuous Speech Recognition
- LVQ:
-
Learning Vector Quantization
- MBN:
-
Mandarin Broadcast News
- MCE:
-
Minimum Classification Error
- MFCC:
-
Mel-Frequency Cepstral Coefficient
- MFPLP:
-
Mel Frequency with Perceptual Linear Prediction
- MGCPM:
-
Mixed Gaussian Continuous Probability Model
- ML:
-
Maximum Likelihood
- MLE:
-
Maximum Likelihood Estimation
- MLLR:
-
Maximum Likelihood Linear Adaption
- MLLT:
-
Maximum Likelihood Linear Transformation
- MLP:
-
Multi-Layer Perceptron
- MMI:
-
Maximum Mutual Information
- MSD:
-
MultiSpace Distribution
- MT:
-
Machine Translation
- NCC:
-
Normalized Cross-Correlation
- NECTEC:
-
National Electronics and Computer Technology Center
- NECTEC-ATR:
-
National Electronics and Computer Technology Center Advanced Telecommunications Research
- NN:
-
Neural Network
- Norm_Log_F0_Mean_Dev:
-
f0 Logarithmic Value and normalizing the value of f0 by mean and standard deviation of every sentence
- OOV:
-
Out of Vocabulary
- ORCHID:
-
Open Linguistic Resources Channeled Toward Interdisciplinary Research
- PB:
-
Phonetically Balanced
- PCR:
-
Phoneme Correct Rate
- PD:
-
Phonetically Distributed
- PER:
-
Phone Error Rate
- PLP:
-
Perceptual Linear Prediction
- PLP:
-
Perceptual Linear Predictive
- PM:
-
Pseudo-Morpheme
- PNCC:
-
Power Normalized Cepstral Coefficients
- QDA:
-
Quadratic Discriminant Analysis
- RLAT:
-
Rapid Language Adaptation Toolkit
- RNN:
-
Recurrent Neural Network
- SA:
-
Syllable Accuracy
- SBN:
-
Stacked Bottle Neck
- SD:
-
Spoken Documents
- SDPBMM:
-
State-Dependent Phoneme Based Model Merging
- SER:
-
Sentence Error Rate
- SFNNAM:
-
State Feedback Neural Network Activation Model
- SGMM:
-
Subspace Gaussian Mixture Model
- SLER:
-
Syllable Error Rate
- SLM:
-
Syllable Lattice Matching
- sMBR:
-
State-Level Minimum Bayes Risk
- SQ:
-
Speech Queries
- SR:
-
Speech Recognition
- SRU:
-
Speech Recognition Unit
- STT:
-
Speech-To-Text
- SVM:
-
Support Vector Machine
- TAR:
-
Tone Accuracy Rate
- TCR:
-
Tone Correct Rate
- TD:
-
Text Documents
- TDRT-I:
-
Thai Diagnostic Rhyme Test for Initials
- TF:
-
Tone Features
- Tone 2:
-
High-Rising
- Tone 3:
-
Dipping
- Tone 4:
-
Falling
- Tone 5:
-
Undefined
- Tone1:
-
High-Level
- TQ:
-
Text Queries
- VERA:
-
Voice Encrypted Recognition Authentication
- VLLP:
-
Very Limited Language Pack
- VNBN:
-
Vietnamese Broadcast News
- VOV:
-
Voice of Vietnamese
- VRS:
-
Voice Recognition System
- VRT:
-
Voice Recognition Technology
- VSM:
-
Vector Space Model
- WA:
-
Word Accuracy
- WDC:
-
Wu Dialect Chinese
- WER:
-
Word Error Rate
- WFST:
-
Weighted Finite State Transducer
- WU:
-
Word Unit
- XIF:
-
Extended Initial/Final
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Kaur, J., Singh, A. & Kadyan, V. Automatic Speech Recognition System for Tonal Languages: State-of-the-Art Survey. Arch Computat Methods Eng 28, 1039–1068 (2021). https://doi.org/10.1007/s11831-020-09414-4
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DOI: https://doi.org/10.1007/s11831-020-09414-4