CN1051100A - The linear predictive coding voice synthesizer that has the adaptive pitch prefilter - Google Patents
The linear predictive coding voice synthesizer that has the adaptive pitch prefilter Download PDFInfo
- Publication number
- CN1051100A CN1051100A CN 90108434 CN90108434A CN1051100A CN 1051100 A CN1051100 A CN 1051100A CN 90108434 CN90108434 CN 90108434 CN 90108434 A CN90108434 A CN 90108434A CN 1051100 A CN1051100 A CN 1051100A
- Authority
- CN
- China
- Prior art keywords
- signal
- pumping signal
- filtering
- predictive coding
- tone
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
- G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
- G10L19/04—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using predictive techniques
- G10L19/26—Pre-filtering or post-filtering
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- Audiology, Speech & Language Pathology (AREA)
- Human Computer Interaction (AREA)
- Computational Linguistics (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Compression, Expansion, Code Conversion, And Decoders (AREA)
- Noise Elimination (AREA)
- Stereophonic System (AREA)
- Filters That Use Time-Delay Elements (AREA)
- Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
Abstract
In the linear predictive coding voice synthesizer, contain pumping signal filtering in pitch enhancement filtering (201) of tone information.The position of pitch enhancement filtering in pumping signal to linear predictive coding wave filter (106) before.In one embodiment, voice synthesizer is installed among the radio receiver.
Description
The present invention, synthetic relevant with language in general, specifically, the present invention is synthetic relevant with the language based on linear predictive coding.
Synthetic, well-known by use based on the language of the platform of linear predictive coding.Be equipped with such platform prior art radio receiver as shown in Figure 1.Reference number is 100.Radio receiver (100) is by corresponding transducer (102), and for example antenna receives a speech encoding signal (101).Radio frequency unit (103) converts the signal of receiving (101) to base band, and this signal of demodulation is to recover speech encoding information.Reference decoder (105) generates the controlled variable that is used for various backs program process from this information.Driving source (104) as mentioned above, uses the pumping signal of parameter generating that offers it.Then this pumping signal is delivered to linear predictive coding wave filter (106) (this pumping signal contains the tone information that is inserted by pitch filter).Linear predictive coding filter (106) produces a synthesized speech signal again at its output terminal.
This synthesized speech signal is in adaptive pitch postfilter (107), filtering in adaptive spectrum postfilter (108) and the rearmounted reinforcement wave filter (109), to strengthen the sensation of natural language, reduce distortion miscellaneous reaches the artificial composition that produces in building-up process influence.Reinforced synthesized speech signal is suitably handled in sound processing unit (111), and by corresponding sound transducer (112) regeneration sound.
Each element that the top is generally mentioned in the art, is that people understand and know.
Tone postfilter (107) plays an important role.Because it provides the additional control to the synthetic language tonal content.Do not have this wave filter, final synthetic language product may be very thick, poor quality.Although this important benefit is arranged, tone postfilter (107) comes artificial composition often for synthetic language zone.Therefore these artificial compositions itself have influenced the natural language effect significantly, need add a pitch enhancement filtering that adapts in linear predictive coding language synthesis unit, concurrent to reduce in synthesized speech signal, conspicuous manual member.
This needs, and the needs of others are met fully by linear predictive coding stage apparatus disclosed herein.According to the present invention, pitch enhancement postfilter has moved on to the position of the excitation input that can handle the linear predictive coding wave filter from the position of handling the output of linear predictive coding wave filter.The effect that the postorder of linear predictive coding wave filter itself is handled is to reduce any artificial effect that can discover.The artificial effect of this class is that tone enhancing prefilter produces when synthesized speech signal.
Fig. 1 has installed the synthetic radio receiver block diagram of linear predictive coding language of using prior art;
Fig. 2 is the block diagram with the synthetic radio receiver of the linear predictive coding language done according to the present invention;
Among Fig. 2, embody radio of the present invention and have the signal that antenna (102) radio frequency unit (a 102) processing that is used for receiving speech encoding signal (101) receives, reproduce speech encoding information.This information is sent to parameter decoder (105).Generate the required controlled variable of postorder processing procedure of all kinds there.Driving source (104) uses the parameter that offers it as mentioned above, produces a pumping signal.This delivers to pitch prefilter (201) by the composite signal that driving source (104) produces.The effect of pitch prefilter is to leach tone information contained in the pumping signal.Composite signal through filtering leads to linear predictive coding wave filter (106) then.The linear predictive coding wave filter is exported synthesized speech signal according to coded message.
According to known method, this composite signal is further handled at adaptive spectrum postfilter (108) and rearmounted the enhancing in the wave filter (109) then, to strengthen the quality of synthetic language.And handle at sound processing unit (111), convert sound to by acoustic transducer (112).
Claims (3)
1, the method for synthetic language comprises:
A) provide a pumping signal that comprises tone information: be further characterized in that following each step:
B) in pitch enhancement filtering, filter pumping signal, so that the pumping signal of a tone filtering to be provided;
C) pumping signal of filtration tone filtering in the language composite filter is to provide a synthesized speech signal.
2, the method for synthetic language comprises:
A) receive an encoded information signal;
B) use this encoded information signal, so that a pumping signal that contains tone information to be provided; Be further characterized in that following each step:
C) in pitch enhancement filtering, filter pumping signal, to provide one if transfer the pumping signal of filtering;
D) pumping signal of filtration tone filtering in the language composite filter is to provide a synthesized speech signal.
3, radio receiver comprises:
A) radio-frequency unit is used for receiving broadcast signal and reproduces encoded information signal, also has in addition:
B) driving source device is connected on the radio-frequency unit reliably, and so that pumping signal to be provided, pumping signal comprises the tone information of response coding information signal, and radio wherein further is characterized as:
C) pitch enhancement filtering device, it is connected on the driving source device reliably, so that filter the tone information in the pumping signal, provides a pumping signal that leaches from essence,
D) linear predictive coding device is used to receive the pumping signal of transmissive wave, and corresponding synthesized speech signal is provided.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US42287189A | 1989-10-17 | 1989-10-17 | |
| US07/422,871 | 1989-10-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1051100A true CN1051100A (en) | 1991-05-01 |
Family
ID=23676771
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 90108434 Pending CN1051100A (en) | 1989-10-17 | 1990-10-15 | The linear predictive coding voice synthesizer that has the adaptive pitch prefilter |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0496829B1 (en) |
| CN (1) | CN1051100A (en) |
| AU (1) | AU644119B2 (en) |
| CA (1) | CA2066568A1 (en) |
| DE (1) | DE69033672T2 (en) |
| WO (1) | WO1991006091A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1055585C (en) * | 1994-11-22 | 2000-08-16 | 冲电气工业株式会社 | Code exciting lnear predict coder and decoder |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9512284D0 (en) * | 1995-06-16 | 1995-08-16 | Nokia Mobile Phones Ltd | Speech Synthesiser |
| DE19629946A1 (en) * | 1996-07-25 | 1998-01-29 | Joachim Dipl Ing Mersdorf | LPC analysis and synthesis method for basic frequency descriptive functions |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4220819A (en) * | 1979-03-30 | 1980-09-02 | Bell Telephone Laboratories, Incorporated | Residual excited predictive speech coding system |
| US4969192A (en) * | 1987-04-06 | 1990-11-06 | Voicecraft, Inc. | Vector adaptive predictive coder for speech and audio |
-
1990
- 1990-09-17 WO PCT/US1990/005191 patent/WO1991006091A1/en active IP Right Grant
- 1990-09-17 AU AU67256/90A patent/AU644119B2/en not_active Expired
- 1990-09-17 EP EP90916987A patent/EP0496829B1/en not_active Expired - Lifetime
- 1990-09-17 DE DE69033672T patent/DE69033672T2/en not_active Expired - Lifetime
- 1990-09-17 CA CA 2066568 patent/CA2066568A1/en not_active Abandoned
- 1990-10-15 CN CN 90108434 patent/CN1051100A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1055585C (en) * | 1994-11-22 | 2000-08-16 | 冲电气工业株式会社 | Code exciting lnear predict coder and decoder |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0496829A1 (en) | 1992-08-05 |
| DE69033672D1 (en) | 2001-01-11 |
| DE69033672T2 (en) | 2001-05-10 |
| WO1991006091A1 (en) | 1991-05-02 |
| AU644119B2 (en) | 1993-12-02 |
| AU6725690A (en) | 1991-05-16 |
| EP0496829A4 (en) | 1993-08-18 |
| CA2066568A1 (en) | 1991-04-18 |
| EP0496829B1 (en) | 2000-12-06 |
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| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |