EP0128065B1 - Verfahren, um ein Anregungssignal für einen Kanal- oder linearen Prädiktionsynthesizer zu erzeugen und Anregungssignalgenerator für diesen Synthesizer - Google Patents

Verfahren, um ein Anregungssignal für einen Kanal- oder linearen Prädiktionsynthesizer zu erzeugen und Anregungssignalgenerator für diesen Synthesizer Download PDF

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EP0128065B1
EP0128065B1 EP19840400915 EP84400915A EP0128065B1 EP 0128065 B1 EP0128065 B1 EP 0128065B1 EP 19840400915 EP19840400915 EP 19840400915 EP 84400915 A EP84400915 A EP 84400915A EP 0128065 B1 EP0128065 B1 EP 0128065B1
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signal
excitation signal
input
excitation
output
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French (fr)
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EP0128065A1 (de
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Jean-Frédéric Zurcher
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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; 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
    • G10L19/08—Determination or coding of the excitation function; Determination or coding of the long-term prediction parameters
    • G10L19/10—Determination or coding of the excitation function; Determination or coding of the long-term prediction parameters the excitation function being a multipulse excitation
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; 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
    • G10L19/02—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 spectral analysis, e.g. transform vocoders or subband vocoders

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  • the invention relates to a method for generating an excitation signal for a channel or linear prediction speech synthesizer, and to an excitation signal generator for such a synthesizer.
  • the invention relates to the synthesis chain of channel vocoders and linear prediction vocoders.
  • the vocoders can be of three types, either of the conventional type, that is to say with detection of the fundamental frequency of the speech signal, or of the baseband type, or of the voice excitation type. The general principle of such vocoders is illustrated in FIG. 1.
  • a vocoder can be broken down into three parts: an analysis sub-assembly 2, a transmission member 4 and a synthesis sub-assembly 6.
  • the analysis sub-assembly 2 will transform a speech signal analog into a digital signal.
  • time coding of the speech signal is not carried out, as in the case for example of a telephone transmission by Pulse Modulation and Coding (MIC ), but we will perform a frequency coding of the speech signal.
  • the bit rate of the speech signal thus coded is of the order of 2 to 12 kbit / s, which is much lower than the MIC coding which requires 64 kbit / s.
  • the speech signal is represented by two types of parameters.
  • a first type of parameters which describes the instantaneous spectral envelope of the speech signal and a second type of parameters which describes the fine structure of the spectrum of the speech signal. This fine structure is often characterized by a single parameter which is the value of the fundamental frequency.
  • a first means 8 of the analysis sub-assembly 2 analyzes and codes the instantaneous spectral envelope of the speech signal and a second means 10 of the analysis sub-assembly codes the fine structure of the spectrum of the speech signal.
  • the two digital signals obtained at the output of the first means 8 and of the second means 10 of the analysis sub-assembly 2 are then transmitted in the transmission member 4, for example in the form of a frame.
  • the two digitized signals are received by the synthesis sub-assembly 6.
  • the digital signal encoding the spectral envelope of the speech signal P is then applied to the input of a means 12 consisting of a filter or a set of filters to restore this spectral envelope.
  • the second digital signal coded by the second means 10 of the analysis sub-assembly 2, is applied to the input of a means 14 for generating an excitation signal which has a fine structure spectrum similar to that of the signal analyzed but of neutral spectral envelope and which delivers a signal to the means 12 which restores a spectral envelope similar to that of the speech signal analyzed.
  • the first means 8 encodes the entire spectral band analyzed, for example between 200 Hz and 6,000 Hz and the means 10 codes a parameter allowing the development of the excitation signal at the reception.
  • the spectral band is cut into a low band, called the base band, for example between 200 Hz and 1000 Hz, and a high band.
  • the low band is coded according to a conventional temporal method by the means 10; on reception, the excitation signal is taken from the decoded base band and the high band is coded by the first means 8 as the total spectral band of the vocoders of the first type.
  • the processing performed by the third type of vocoder differs from that performed by the second in that the excitation signal is not deduced from the decoded baseband, but is obtained from parameters provided by a temporal analysis of the signal. of speech.
  • the baseband In known baseband vocoders, the baseband is generally around 800 Hz in width. Indeed, it is necessary that the baseband contains the fundamental frequency of the speech signal and several of its harmonics in order to generate an excitation signal comprising all the harmonic frequencies of the fundamental frequency which are contained in the spectral band processed. . In addition, in known baseband vocoders, the development of the excitation signal requires sophisticated spectrum equalization treatments to deliver an approximately flat excitation signal, i.e. a signal excitation whose instantaneous spectral envelope does not have too strong ripple.
  • Known baseband vocoders therefore have the drawbacks, on the one hand, of a high data rate between the analysis sub-assembly and the synthesis sub-assembly because of the width of the base band to be transmitted and on the other hand a high cost price because of the sophisticated processing carried out to generate the excitation signal.
  • the invention overcomes these drawbacks. It resides in a method for developing the excitation signal obtained without sophisticated processing, which is a significant improvement in particular in the case of baseband vocoders, or with vocal excitation.
  • the excitation signal has a substantially constant energy which does not depend on the value of the fundamental frequency.
  • the excitation signal has an energy significantly higher than the energy of an excitation signal consisting of single pulses spaced from the fundamental period. This has the advantage of improving the signal / noise ratio of the synthesized signal.
  • the synthetic signal obtained provides a more natural auditory impression (less metallic), if the comparison is made with what is obtained with an excitation signal consisting of pulses spaced from the fundamental period.
  • the subject of the invention is a method of developing an excitation signal for a channel synthesizer or a linear prediction, in which a signal consisting of a sequence of pseudo- pulses is delivered. predetermined random frequency, and in which said sequence is reset when a determined event occurs whose repetition frequency is linked to the fundamental frequency of the speech signal, the amplitude of the excitation signal having a predetermined fixed value and the polarity of said signal d excitation being determined by the logical level of the pulses of the pseudo-random sequence.
  • a signal representative of the value of the fundamental frequency is received at the synthesis and is generated, in relation with the occurrence of the determined event, a signal to reset the pseudo-random pulse sequence, the frequency of this signal being linked to the value received from said basic frequency.
  • the determined event is constituted by the passage of the signal of the baseband received by the value zero in a determined direction, or by the passage of the baseband signal through a determined extremum.
  • an excitation signal generator for a speech synthesizer comprising generator means for delivering a predetermined pseudo-random pulse sequence, means for resetting the generator means in response to the reception of a control signal, means for producing the excitation signal sensitive to the logic level of the pulses of said sequence to generate an excitation signal of predetermined fixed amplitude and polarity determined by the logic level of said sequence and detection means of a determined event whose frequency is linked to the fundamental frequency of the speech signal, said detection means controlling said reset means.
  • the generator means comprise a shift register, at least one NON-OR-EXCLUSIVE gate whose inputs are connected to two output stages of the register, the output of said door being connected to the data input of the register, the latter further comprising a reset input connected to the output of the reset means.
  • the generator means comprise, in the case of a channel synthesizer, a logic inverter whose input is connected to the output of the NOR-OR gate. EXCLUSIVE.
  • FIG. 2 represents the central core of the excitation signal generator according to the present invention.
  • This generator 40 comprises a shift register 46 whose outputs of two of the stages Q7 and Q9 are looped back to its data input D via a NOR gate 48.
  • the shift register is clocked by a HOR clock signal applied to its input H, and also includes a reset input R, to ensure the reset of the register in response to the application of a reset signal.
  • the generator 40 also includes an AND gate 56, one of which input receives the aforementioned clock signal, and two flip-flops 58 and 60 of type D which are mounted in the following manner: the clock input of flip-flop 58 is connected to the output of gate 56 and its output Q is looped back to its input terminal D and connected to the clock input of the flip-flop 60. The output Q of the latter is also looped back to its input terminal D and also to one of the inputs of the AND gate 56.
  • the reset inputs to "1 RAU (Set in English terminology) of flip-flops 58 and 60 are connected permanently to ground, and the reset inputs to “0” RESET (Reset in English terminology) are connected to a line intended to receive a control signal which has a repetition period corresponding to the frequency of the fundamental of the signal of speech.
  • the output Q of the flip-flop 58 is connected to the input R of the register 46.
  • An inverter 54 has also been provided, the input of which receives the output signal from the gate 48.
  • the input signals S1 and output S2 of the inverter 54 are in phase opposition, and are intended to produce respectively the excitation signals for the odd and even channels of the synthesis subset in the case a channel synthesizer.
  • the clock signal HOR received by the shift register 46 has, in the case of using a digital synthesizer, the same frequency as the sampling frequency of the digital synthesis filters, for example a frequency of 16 kHz.
  • the two flip-flops 58 and 60 have the role of synchronizing the reset pulses applied to the shift register 46, with the clock pulses.
  • the generator 40 operates as follows: when the signal applied to the reset input of flip-flops 58 and 60 is at "1 •, the outputs Q of these scales are kept at "1 •.
  • the RESET input of flip-flops 58 and 60 receives a “0 •, the reset to zero of these flip-flops is no longer imposed, and on the first rising edge of the clock signal HOR which follows this event, the output Q of flip-flop 58 goes to state “0” given the looping back from to input D.
  • the zeroing of output Q of flip-flop 58 acts at the level of reset input R, which puts the outputs Q of register 46 to zero, that is to say, which reinitializes the pseudo-random pulse sequence delivered by the gate shift register system NON-OR-EXCLUSIVE.
  • the output Q of flip-flop 58 changes to "1 since its input D is at" 0 •, previous value on output Q. This transition acts on the clock input of flip-flop 60 and the output Q of the latter goes to zero.
  • a pulse on the entry R of the register 46 which is in phase with the clock signal HOR and whose width is equal to the duration separating two clock pulses.
  • the gate 48 delivers a "1 which will be transferred in the different stages of the register at the rate of the clock. This level "1 is maintained until a" 1 "propagates to a stage n whose output Qn is connected to the input of gate 48 (stage Q7 if we consider FIG. 2) . At this moment, the logic state changes at the output of gate 48, and in the remainder of the sequence, this gate delivers a series of pulses of pseudo-random width.
  • FIG. 2 shows connections between the outputs of stages Q7 and Q9 of register 46 and the inputs of gate 48, other alternatives are possible for the choice of output stages.
  • the output of gate 48 delivers a signal whose logic level determines the polarity of the excitation signal of the synthesis chain (this signal will have a constant amplitude in absolute value).
  • This excitation signal is directed towards the input of the synthesis predictor filter (for a linear prediction synthesizer), or to the inputs of the bandpass filters of the synthesis channels (in the case of a channel vocoder).
  • the inverter 54 intervenes as follows: the signal S1 on the input of the latter is used to generate the excitation signal of the synthesis channels of odd rank, while the signal S2 on its output is used to generate the excitation signal of even rank channels.
  • This measurement makes it possible to compensate for phase shifts between channels in the usual case where the filters of the synthesis channels are of the fourth order and overlap at -6 dB and practically in phase opposition. An essentially flat frequency response is thus obtained over the entire frequency band thus treated.
  • the reset is done in response to the reception on the RESET inputs of a signal which has a repetition period corresponding to the fundamental frequency of the speech signal, and that the pseudo-random pulse sequence always proceeds from the same way after its reset, it appears that this sequence also has a periodicity corresponding to the fundamental frequency. Since this sequence is made up of a series of pulses, it therefore has a broad frequency spectrum, and on average flat, comprising all the harmonics of the fundamental frequency necessary for the proper functioning of a speech synthesizer. In the absence of a fundamental frequency, the reset is done randomly and the sequence has a white noise spectrum.
  • FIG. 3 a variant of the embodiment of the generator of Figure 2 to obtain a more regular and less noisy excitation signal for the first channels (in the case of a channel synthesizer) vocoder (channels covering the spectral band up to approximately 1000 Hz).
  • This excitation signal allows in particular a better reproduction of the voiced sounds.
  • This generator comprises the same elements as that of FIG. 2 which are designated by the same reference numbers.
  • a flip-flop 62 has been added to it, the reset input at “0” (RESET) being connected to the output Q of flip-flop 58, and the reset input at “1” (RAU) receiving the output signal S2 of the logic inverter 54.
  • the data inputs D and clock H are reset to zero by connection to ground.
  • the output Q of this flip-flop delivers a signal S 01 which is used to produce the signal of excitation of the first channels of odd rank, for example of ranks 1 and 3 and the output delivers a signal S 02 which is used to produce the excitation signal of the first channels of even rank, for example of rank 2 and 4.
  • the output Q of the flip-flop 62 delivers a sequence of p " 1 "successive, the length of this sequence being equal to the total length of the pulse of level" 1 ", at the output of gate 48, immediately following the reset. Thereafter, the Q output of flip-flop 62 remains at zero until the next reset. It can be seen that the flip-flop 62 behaves in the same way as a conventional flip-flop.
  • the pulses transmitted to the reset inputs of flip-flops 58 and 60, and whose repetition period corresponds to the frequency of the fundamental of the speech signal, are generated in the following manner:
  • the reset to zero is controlled by pulses spaced apart by random lengths or else the reset can be suppressed.
  • the means 10 comprises a low-pass filter 16 which allows only the base band of the spectral band of the speech signal P to pass and a coding means 18 which performs digital coding of the analog signal delivered by the low-pass filter 16
  • the width of the baseband is for example of the order of 500 Hz.
  • the coding means 18 performs time coding in a known manner.
  • the digital signal delivered by the means 10 is framed with the digital signal delivered by the means 8 corresponding to the data of the analysis channels by a framing means 20.
  • the frame is then transmitted by a transmission device 22 on a transmission line L.
  • the frame is applied to the input of a reception member 24.
  • This is connected in series to a separation means 26 which delivers the channel data to the means 12 on the one hand, and the digital signal encoding the baseband by means 14 of developing the excitation signal on the other hand.
  • This means 14 comprises in series a delay means 28, a decoding means 30, a low-pass filter 32, an adder 34, an input of which is connected to a noise generator 36, a detection means 38 and a signal generator excitation 40 of the type according to the invention and previously described in FIGS. 2 and 3.
  • the delay means 28 has the function of compensating for the delay of the channel data on the baseband signal caused by the low pass filters of the analysis channels and the transmission of the channel data. This delay is adjusted empirically. It is around 20 to 30 ms.
  • the signal delivered by the means 28 is then decoded by the means 30 which restores an analog signal.
  • This means 30 performs the reverse transformation from that carried out by the means 18 of FIG. 2a. It is followed by a low-pass filter 32, similar to the low-pass filter 16, at the output of which the baseband signal is found.
  • This signal can be noisy thanks to an adder 34 receiving the baseband signal on one input and a noise generated by a white noise generator 36 on another input. This addition of noise is optional.
  • the baseband does not transport energy, to apply to the input of the detection means 38 a signal whose zero crossings are almost random, zero crossings from which a random excitation signal can be generated.
  • the added noise is low, its level can be for example - 60 dB compared to the maximum level of the baseband.
  • the detection means 38 has the function of detecting the occurrences of a determined event in the baseband and of emitting a pulse at each of these occurrences.
  • This determined event the repetition frequency of which corresponds to the fundamental period of the speech signal, may be the zero crossing in a determined direction of the baseband signal, the detection then being carried out simply by a comparator. It is also possible to choose as an easily detectable event, for example, the passage of the baseband signal through a determined extremum.
  • the pulses delivered by the detection means 38 to each of said occurrences are applied to the reset inputs of flip-flops 58 and 60 of the generator 40.
  • the output of the pseudo-random pulse sequence is paced by the clock signal HOR and reset when a pulse is delivered at the output of the means 38.
  • Voice-activated vocoders differ from baseband vocoders in that the baseband is not transmitted. In vocoders with vocal excitation, the detection of the occurrences of the determined event mentioned above is therefore done in the subset of vocoder analysis.
  • FIG. 5a represents part of an analysis sub-assembly of a vocoder with vocal excitation.
  • the means 10 comprises in series, a low-pass filter 32 receiving the speech signal P as an input, an adder 34 receiving on a input a noise signal coming from a white noise generator 36, a detection means 38 delivering a pulse at each occurrence of the determined event and a coding means 42.
  • This coding means 42 codes the dates of appearance of the determined event.
  • This coding means which is simple to implement has the advantage of requiring only a low bit rate equal to nF bit / second.
  • the signal delivered by the coding means 42 is framed with the analysis data coming from the first means 8 in a framing means 20.
  • a transmission member 22 then delivers the frame on the transmission line L.
  • the transmitted signal is received by a reception member 24.
  • This is connected to a separation means 26 which delivers the data analysis by means 12 on the one hand and the signal coding the dates of occurrences of the event determined by means 14 of development of the excitation signal on the other hand.
  • This means 14 comprises a decoding means 44 receiving as input every T seconds, a number determining the date of occurrence of the determined event, or its absence, in said time interval T and delivering an impulse to each of said occurrences, this pulse being transmitted to the reset inputs of flip-flops 58 and 60 of the excitation signal generator 40.

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Claims (12)

1. Verfahren zum Erzeugen eines Anregungssignals für einen Kanal- oder linearen Prädiktions-Synthesizer, ausgehend von einem von einer pseudozufälligen, vorbestimmten Impulsreihe gebildeten Signal, dadurch gekennzeichnet, daß man diese Reihe wieder initialisiert, wenn ein bestimmtes Ereignis auftritt, dessen Wiederholungsfrequenz an die Grundfrequenz des Wortsignals gebunden ist, daß die Amplitude des Anregungssignals einen vorbestimmten festen Wert besitzt und die Polarität des Anregungssignals durch den logischen Pegel der Impulse der pseudozufälligen Reihe bestimmt wird.
2. Verfahrenzum Erzeugen eines Anregungssignals nach Anspruch 1, dadurch gekennzeichnet, daß im Falle eines Kanalsynthesizer die pseudozu- ' fällige Impulsreihe die Form eines ersten und eines zweiten Impulszugs (S1, S2) aufweist, die gleichzeitig und mit entgegengesetzter Phase erzeugt werden, wobei einer der Impulszüge (S1) den ungeraden Kanälen und der andere Impulszug (S2) den geraden Kanälen zugewiesen wird.
3. Verfahren zum Erzeugen eines Anregungssignals nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß man im Falle eines Vocoders für das Erfassen und das Messen der Grundfrequenz bei der Synthese ein für den Wert der Grundfrequenz repräsentatives Signal erhält und in Bezug mit dem Auftreten des bestimmten Ereignisses ein Signal zum Wiederinitialisieren der pseudozufälligen Impulsreihe erzeugt, wobei die Frequenz dieses Signals an den für die Grundfrequenz erhaltenen Wert gebunden ist.
4. Verfahren zum Erzeugen eines Anregungssignals nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß im Falle eines Vocoders mit einem Grundband das bestimmte Ereignis durch den Durchgang des erhaltenen Signals des Grundbands, durch den Wert Null in einer bestimmten Richtung oder durch den Durchgang des Signals des Grundbands durch ein bestimmtes Extrem gebildet wird.
5. Verfahren zum Erzeugen eines Anregungssignals nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß im Falle eines Vocoders mit Stimmanregung das bestimmte Ereignis bei der Analyse in dem Signal des Grundbands durch Erfassen der Nulldurchgänge in dem gleichen Sinn oder durch Erfassen der Extreme erfaßt wird; wobei nur der Wert der Abstände zwischen aufeinanderfolgenden Ereignissen übertragen wird, und daß man bei der Synthese diese Ereignisse aufgrund der erhaltenen Abstandswerte wieder herstellt.
6. Anregungssignalgenerator für Wort-Synthesizer mit Generatormitteln (46, 48) zum Abgeben einer pseudozufälligen, vorbestimmten lmpulsreihe, dadurch gekennzeichnet, daß der Anregungssignalgenerator Mittel (58, 60) zum Wiederinitialisieren der Generatormittel, Mittel zum Erzeugen des Anregungssignals, die auf den logischen Pegel der Impulse der Reihe ansprechen, um ein Anregungssignal mit fester, vorbestimmter Amplitude und Polarität zu erzeugen, die durch den logischen Pegel der Reihe bestimmt ist, und Erfassungsmittel (38) für ein bestimmtes Ereignis umfaßt, dessen Frequenz an die Grundfrequenz des Wortsignals gebunden ist, wobei die Erfassungsmittel die Mittel zum Wiederinitialisieren steuern.
7. Anregungssignalgenerator für Wort-Synthesizer nach Anspruch 6, dadurch gekennzeichnet, daß im Falle eines Kanal-Synthesizers die Generatormittel gleichzeitig zwei Impulszüge mit entgegengesetzter Phase abgeben, wobei die Mittel zum Erzeugen des Anregungssignals jeweils einem der Impulszüge zugeordnet sind.
8. Anregungssignalgenerator nach Anspruch 6, dadurch gekennzeichnet, daß die Generatormittel ein Schieberegister (46) und wenigstens ein exklusives NICHT-ODER-Tor (48) umfassen, dessen Eingänge mit zwei Ausgangsstufen (Q7, Q9) des Registers (46) verbunden sind, wobei der Ausgang des Tors mit dem Dateneingang des Registers verbunden ist, welches ferner einen Wiederinitialisierungseingang (R) aufweist, der mit dem Ausgang der Wiederinitialisierungsmittel (58, 60) verbunden ist.
9. Anregungssignalgenerator nach Anspruch 8, dadurch gekennzeichnet, daß die Generatormittel im Falle eines Kanal-Synthesizers einen logischen Inverter (54) umfassen, dessen Eingang mit dem Ausgang des exklusiven NICHT-ODER-Tors verbunden ist.
10. Anregungssignalgenerator nach Anspruch 8 oder 9, dadurch gekennzeichnet, daß die Wiederinitialisierungsmittel (58, 60) auf das Steuersignal und das Taktsignal des Schieberegisters (46) ansprechen, um an dem Wiederinitialisierungseingang (R) des Registers ein erneut mit dem Taktsignal synchronisiertes Steuersignal zu liefern.
11. Anregungssignalgenerator nach einem der Ansprüche 8 bis 10, dadurch gekennzeichnet, daß die Wiederinitialisierungsmittel ein UND-Tor (56) und eine erste (58) und eine zweite (60) Kippschaltung vom Typ D aufweisen, deren Eingänge zum Zurücksetzen auf « 1 » (RAU) mit Masse verbunden sind und deren Eingänge zum Zurücksetzen auf « 0 das Steuersignal erhalten, wobei ein erster Eingang des UND-Tors das Taktsignal des Schieberegisters (46) erhält, der andere Eingang dieses Tors mit dem invertierten Ausgang (Q) der zweiten Kippschaltung (60) verbunden ist, der Ausgang des UND-Tors (56) mit dem Takteingang der ersten Kippschaltung (58) verbunden ist, deren invertierter Ausgang (Q) auf deren Dateneingang (D) rückgekoppelt und mit dem Wiederinitialisierungseingang (R) des Schieberegisters (46) sowie dem Takteingang der zweiten Kippschaltung (60) verbunden ist, deren invertierter Ausgang (Q) auf ihren Dateneingang (D) rückgekoppelt ist.
12. Anregungssignalgenerator nach Anspruch 9 und 11, dadurch gekennzeichnet, daß er eine bistabile Kippschaltung (62) umfaßt, deren Eingang zum Rücksetzen auf « 0 mit dem nichtinvertierten Ausgang (Q) der ersten Kippschaltung und deren Eingang zum Rücksetzen auf « 1 mit dem Ausgang des logischen Inverters (54) verbunden ist, daß jeder der Ausgänge der bistabilen Kippschaltung (62) mit einer Generatoreinrichtung für das Anregungssignal verbunden ist, daß der nichtinvertierte Ausgang einer vorbestimmten Anzahl von ungeraden, aufeinanderfolgenden Kanälen zugewiesen ist, die ausgehend von dem ersten, ungeraden Kanal, genommen wird, und daß der invertierte Ausgang einer vorbestimmten Anzahl von aufeinanderfolgenden, geraden Kanälen zugewiesen ist, die ausgehend von dem ersten, geraden Kanal genommen wird.
EP19840400915 1983-05-09 1984-05-04 Verfahren, um ein Anregungssignal für einen Kanal- oder linearen Prädiktionsynthesizer zu erzeugen und Anregungssignalgenerator für diesen Synthesizer Expired EP0128065B1 (de)

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FR8307712A FR2545966B1 (fr) 1983-05-09 1983-05-09 Procede d'elaboration d'un signal d'excitation pour synthetiseur de parole a canaux ou a prediction lineaire et generateur de signal d'excitation pour un tel synthetiseur
FR8307712 1983-05-09

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EP0128065A1 EP0128065A1 (de) 1984-12-12
EP0128065B1 true EP0128065B1 (de) 1987-12-02

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FR1602217A (de) * 1968-12-16 1970-10-26
DE2062680A1 (de) * 1970-12-19 1972-06-29 Licentia Gmbh Synthetisator für Sprachsignale
DE2435057B2 (de) * 1973-10-18 1975-09-11 Hewlett-Packard Ltd., South Queensferry, West Lothian (Grossbritannien) Schaltungsanordnung zum Synchronisieren und/oder erneuten Auslösen eines Generators zum Erzeugen einer Folge von pseudozufälligen Binärsignalen
FR2252799A5 (en) * 1973-11-26 1975-06-20 Commissariat Energie Atomique Automatic recording and synthesis of speech - uses time interval sectioner for speech amplitude signals with analogue-digital-analogue conversion

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FR2545966B1 (fr) 1986-02-21
FR2545966A1 (fr) 1984-11-16
EP0128065A1 (de) 1984-12-12
DE3467946D1 (en) 1988-01-14

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