SE367080B - - Google Patents
Info
- Publication number
- SE367080B SE367080B SE14212/70A SE1421270A SE367080B SE 367080 B SE367080 B SE 367080B SE 14212/70 A SE14212/70 A SE 14212/70A SE 1421270 A SE1421270 A SE 1421270A SE 367080 B SE367080 B SE 367080B
- Authority
- SE
- Sweden
- Prior art keywords
- pitch
- signal
- frequency
- signals
- speech
- Prior art date
Links
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Computational Linguistics (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- Audiology, Speech & Language Pathology (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Compression, Expansion, Code Conversion, And Decoders (AREA)
- Electrophonic Musical Instruments (AREA)
Abstract
1310036 Speech synthesiser LTV ELECTRO-SYSTEMS Inc 22 Oct 1970 [22 Oct 1969] 50267/70 Heading H4R In a speech synthesizer an input signal comprises a succession of frames of digital words, each frame comprising one word, defining the fundamental frequency of a speech signal, and a number of other words, defining the energy in respective predetermined frequency bands of the original speech signal. The frequency information word is used to produce digital signals indicative of the fundamental frequency and its harmonics up to a predetermined upper frequency limit. The digital signals corresponding to the various frequencies are combined with the respective amplitude information words to derive digital signals corresponding to instantaneous values of a sine wave of the corresponding frequency and amplitude. The derived digital signals in respect of each frame are summed, preferably equalized in level by reference to the number of harmonics contained, and the resulting digital signal converted to analogue form to provide the output speech signal. As described with respect to Fig. 1 the input control signal at 14 comprises a frame of 54 bits, six bits denoting the pitch frequency followed by fifteen groups of three bits and one group of two bits denoting the energy level in sixteen bands across the speech spectrum. A serial to parallel converter 18 feeds the incoming pitch frequency information to a pitch frequency register 26 and the amplitude signals to amplitude register 30. The pitch signals in register 26 are converted to signals defining the pitch frequency in binary form in converter 28 and the resulting signals are stored in store 29 for the remainder of the frame. During the remainder of the frame the pitch signal is fed to adder 35 and accumulator 36 which, at times defined by a clock signal from timing control 12, successively adds the pitch signal to itself a number of times to identify each of the pitch harmonics. A magnitude comparator 50 compares the various pitch harmonics with signals from the table of channel bandwidths 70 so that it is determined which pitch harmonics are associated with each of the energy level signals in the envelope register 30. A complete comparison cycle is completed in 1/256 th of the period of the period of the frequency corresponding to the pitch signal in the register 26 and a complete cycle of comparisons is signalled by a "K" pulse on line 52. The "K" pulse, as well as triggering the operation of output circuits 84, 85, 86, also triggers a K counter 80 which has a counting range of 256 so that the counter cycles at the pitch frequency. The actual state of the count of the K counter 80 is fed to the adder 77 and K-H accumulator 75 so that the signal on the output of the K-H accumulator increases at a steady rate between K pulses, the rate of increase varying with the state of the K pulse counter 80, and being reset by each K pulse. The signal appearing at the output of accumulator 75 is fed, via adder 78, to the table of amplitude modulated trigonometric functions 90 where, together with amplitude information for the various speech frequency analysis bands, appropriate binary numbers are selected corresponding to instantaneous values of each of the harmonics of the pitch frequency. These values are added and stored in 85, multiplied, in 84, by a scaling factor, to compensate for the change in level dependent on the number of harmonies present, and converted to analogue form by D to A converter 86, to provide an output sample of synthesized speech. During unvoiced sounds the pitch frequency information signal will be all zeros, this is detected by unvoiced detector 33 to cause energization of a noise generator 127 which injects, via adder 78, random numbers into the digital signal from the K-H accumulator. At the same time a number corresponding to a pitch frequency of 128 Hz is fed into the store 29 so that the "K" counter and K-H accumulator operate as for 128 KHz pitch, and the result is a natural sounding unvoiced signal output.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US87001269A | 1969-10-22 | 1969-10-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
SE367080B true SE367080B (en) | 1974-05-13 |
Family
ID=25354615
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SE14212/70A SE367080B (en) | 1969-10-22 | 1970-10-21 |
Country Status (8)
Country | Link |
---|---|
US (1) | US3697699A (en) |
JP (1) | JPS521603B1 (en) |
CA (1) | CA976655A (en) |
DE (1) | DE2051589C3 (en) |
FR (1) | FR2088984A5 (en) |
GB (1) | GB1310036A (en) |
IL (1) | IL35513A (en) |
SE (1) | SE367080B (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1458966A (en) * | 1972-12-22 | 1976-12-22 | Electronic Music Studios Londo | Waveform processing |
US3865982A (en) * | 1973-05-15 | 1975-02-11 | Belton Electronics Corp | Digital audiometry apparatus and method |
US4076958A (en) * | 1976-09-13 | 1978-02-28 | E-Systems, Inc. | Signal synthesizer spectrum contour scaler |
CA1114954A (en) * | 1978-07-17 | 1981-12-22 | Arthur J. Tardif | Digital sound synthesizer |
US5054072A (en) * | 1987-04-02 | 1991-10-01 | Massachusetts Institute Of Technology | Coding of acoustic waveforms |
US20110046957A1 (en) * | 2009-08-24 | 2011-02-24 | NovaSpeech, LLC | System and method for speech synthesis using frequency splicing |
JP6428256B2 (en) * | 2014-12-25 | 2018-11-28 | ヤマハ株式会社 | Audio processing device |
-
1969
- 1969-10-22 US US870012A patent/US3697699A/en not_active Expired - Lifetime
-
1970
- 1970-10-21 SE SE14212/70A patent/SE367080B/xx unknown
- 1970-10-21 DE DE2051589A patent/DE2051589C3/en not_active Expired
- 1970-10-21 CA CA096,156A patent/CA976655A/en not_active Expired
- 1970-10-22 JP JP45092497A patent/JPS521603B1/ja active Pending
- 1970-10-22 GB GB5026770A patent/GB1310036A/en not_active Expired
- 1970-10-22 FR FR7038197A patent/FR2088984A5/fr not_active Expired
- 1970-10-23 IL IL35513A patent/IL35513A/en unknown
Also Published As
Publication number | Publication date |
---|---|
CA976655A (en) | 1975-10-21 |
DE2051589B2 (en) | 1980-04-03 |
US3697699A (en) | 1972-10-10 |
JPS521603B1 (en) | 1977-01-17 |
DE2051589A1 (en) | 1971-06-16 |
DE2051589C3 (en) | 1980-11-27 |
GB1310036A (en) | 1973-03-14 |
IL35513A0 (en) | 1970-12-24 |
FR2088984A5 (en) | 1972-01-07 |
IL35513A (en) | 1974-01-14 |
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