time-domain harmonic scaling

Time-domain harmonic scaling (TDHS) is a method for time-scale modification of speech (or other audio signals),{{cite journal

|author1=Richard V. Cox |author2=Ronald E. Crochiere |author3=James D. Johnston |date=February 1983

| title = Real-time implementation of time domain harmonic scaling of speech for rate modification and coding

| journal = IEEE Transactions on Acoustics, Speech, and Signal Processing

| volume = ASSP-31

| issue = 1

| pages = 258–272

|doi=10.1109/JSSC.1983.1051894 |bibcode=1983IJSSC..18...10C | url = http://sipl.technion.ac.il/Info/new/Teaching/Experiments/EXP-Speech/0258cox.pdf

}} allowing the apparent rate of speech articulation to be changed without affecting the pitch-contour and the time-evolution of the formant structure.{{ cite journal

|author1=Moulines, Eric |author2=Jean Laroche.

|name-list-style=amp | title = Non-parametric techniques for pitch-scale and time-scale modification of speech.

| journal = Speech Communication

| volume = 16 | issue = 2

| year = 1995

| pages = 175–205

| url = http://sipl.technion.ac.il/new/Teaching/Projects/spring2007/TimeScale.pdf

| doi=10.1016/0167-6393(94)00054-e

}} TDHS differs from other time-scale modification algorithms in that time-scaling operations are performed in the time domain (not the frequency domain).{{ cite journal

| author = D. Malah, R.E. Crochiere, and R.V. Cox.

| title = Performance of transform and subband coding systems combined with harmonic scaling of speech

| journal = IEEE Transactions on Acoustics, Speech, and Signal Processing

| volume = 29 | issue = 2

| year = 1981

| pages = 273–283

| url = https://malah.net.technion.ac.il/files/2017/08/Malah_Performance_ASSP81.pdf

| doi=10.1109/tassp.1981.1163547

}} TDHS was proposed by D. Malah in 1979.

{{cite journal

| author = David Malah

|date=April 1979

| title = Time-domain algorithms for harmonic bandwidth reduction and time scaling of speech signals

| journal = IEEE Transactions on Acoustics, Speech, and Signal Processing

| volume = ASSP-27

| issue = 2

| pages = 121–133

| url = https://malah.net.technion.ac.il/files/2017/08/Time_Domain.pdf

}}