TWI790705B - Method for adjusting speech rate and system using the same - Google Patents

Abstract

A method for adjusting speech rate includes obtaining an original voice signal for a plurality of character and a total adjustment time, analyzing the original speech signal to obtain voiced signal section corresponding to each character and unvoiced signal section corresponding to each character, calculating a frame-adjustment amount according to the total adjustment time and single-frame duration, and adjusting the number of sound frames in at least one voiced signal section according to the frame-adjustment amount to form the adjusted voice signal.

Description

Speech speed adjustment method and system

The invention relates to speech processing technology, in particular to a speech rate adjustment method and system thereof.

The audio description of video and audio provides a voice description of changes in events such as character actions and scene changes through a specially-made audio track. Audio description can improve the accessibility of visual imagery for people who are blind, have low vision, or have other visual impairments.

Audio descriptions are expensive and cumbersome to create. Producers of audiovisuals have traditionally hired script writers and voice talent to create audio descriptions. In this traditional method, the script writer finds out the video clips that need to add audio descriptions by watching the content of the video and audio, so as to determine the time point where the audio descriptions need to be inserted and estimate the available time of the audio descriptions, and create a script based on the content of the video clips Script for descriptive audio. The voice talent then records the audio description according to the available time according to the script. Typically, script writers and speech talents must repeat the aforementioned process several times to optimize the resulting audio description, within the time constraints of available time. For example, a script writer may modify a video segment that requires audio description to accommodate a new available time, or a script writer may rewrite a script to accommodate a shorter available time, or a voice talent may repeatedly adjust his speaking speed to accommodate an available time. Because of these challenges, the price of traditional audio description services is quite high.

An embodiment of the present invention provides a speech rate adjustment method, which includes: obtaining original speech signals of multiple characters and the total adjustment duration; analyzing the original speech signals to obtain voiced signal segments and unvoiced signal segments corresponding to each word; calculating the frame adjustment amount by the total adjustment duration and the unit frame duration; and adjusting the number of frames in at least one voiced signal segment according to the frame adjustment amount to form an adjusted voice signal.

Another embodiment of the present invention provides a speech rate adjustment system, which includes: a storage unit, an analysis unit, and an adjustment unit. The analysis unit is coupled to the storage unit, and the adjustment unit is coupled to the storage unit and the analysis unit. The storage unit temporarily stores the original voice signals of multiple characters. The analysis unit analyzes the original speech signal to obtain voiced signal segments and unvoiced signal segments corresponding to each character. The adjusting unit calculates the frame adjustment amount according to the total adjustment duration and the unit frame duration, and adjusts the number of frames in at least one voiced signal segment according to the frame adjustment amount to form an adjusted speech signal.

To sum up, the speech rate adjustment method of any embodiment is suitable for adjusting the speech rate of the speech signal to provide an audio file that satisfies the time limit, thereby reducing the number of repeated recordings and greatly reducing the production cost of the audio file.

Referring to FIG. 1 and FIG. 2 , an embodiment of the present invention provides a speech rate adjustment system 10 , including: a storage unit 110 , an analysis unit 120 and an adjustment unit 130 . The analysis unit 120 is coupled to the storage unit 110 , and the adjustment unit 130 is coupled to the storage unit 110 and the analysis unit 120 . Here, the storage unit 110 temporarily stores at least one character of the original speech signal. Wherein, the present invention also provides a speech rate adjustment method, which can be realized by a speech rate adjustment system. For clarity, the original speech signal of multiple characters is taken as an example for illustration below.

Here, the method for adjusting the speech rate may be applicable to adjusting the speech rate of the pronunciation of a word or sentence, or adjusting the speech rate of the audio description of a video or video. The technical content of the speech rate adjustment method will be described in detail later.

In one embodiment, the analysis unit 120 can obtain and analyze the original speech signal Si (step S21) to obtain the voiced sound (voiced sound, also known as sound) signal segment and the unvoiced sound (unvoiced sound, also known as no sound) corresponding to each character. ) signal section (step S22). The adjustment unit 130 can obtain the total adjustment duration N1 (step S21), calculate the number of sound frames to be removed (that is, the adjustment amount of the sound frame) according to the total adjustment duration N1 and the unit sound frame duration (step S23), and according to The frame adjustment amount adjusts the frame quantity of at least one voiced signal segment among the voiced signal segments of the characters to form the adjusted speech signal So (step S24 ). Wherein, a speech frame is a minimum signal segment when performing speech signal processing, and a unit speech frame duration is the time length of a minimum signal segment.

In some embodiments, the original speech signal Si includes the word sound signals Sp1˜Sp7 of the words Wo, as shown in FIG. 3 . Each character sound signal Sp1-Sp7 includes a plurality of phonetic frames (hereinafter referred to as original phonetic frames).

Among them, in linguistics, the sound whose vocal cords vibrate during pronunciation is called voiced sound, the sound without vocal cord vibration is called unvoiced sound, and there are consonants, which have both unvoiced and voiced sounds. In this case, when encountering a word with consonants, you can first After distinguishing between voiced and unvoiced sounds, adjust the speech rate.

In some embodiments of step S22, the analysis unit 120 analyzes the original speech signal Si to find out the word sound signals Sp1-Sp7 of each word Wo in the original speech signal Si (that is, the signal segment corresponding to each word), and then Analyze the word sound signal Sp1~Sp7 of each word Wo to find out the voiced sound signal segment (that is, the signal segment corresponding to voiced sound pronunciation) and the unvoiced sound signal segment (that is, the signal segment corresponding to unvoiced sound pronunciation) in each word sound signal Sp1~Sp7 ). For example, referring to FIG. 3 , the analysis unit 120 can convert the original speech signal Si from the time-to-amplitude speech waveform F1 into the time-to-frequency sound spectrum F2, and recognize the word sound signal of each word Wo according to the energy distribution state. Sp1~Sp7. In Fig. 3, for the voice waveform F1, the horizontal axis is time (seconds), and the vertical axis is amplitude (decibel); for the sound spectrum F2, the horizontal axis is time (seconds); the vertical axis is frequency (hertz (Hz)). Then, the analysis unit 120 identifies the voiced sound signal segment Z2 and the unvoiced sound signal segment Z1 according to the energy distribution state in the word sound signal Sp of each word Wo.

In an embodiment of step S23, the adjustment unit 130 removes an original sound frame at fixed intervals from the voiced signal section Z2 by the original sound frame adjustment amount, so as to form a speech frame relative to the original speech signal Si The adjusted voice signal So with a faster speed. Wherein, the adjusting unit 130 is to perform sound signal processing of deleting sound frames for the voiced sound signal segment Z2 whose total sound frame amount is greater than the sound frame adjustment amount.

For example, assume that the amount of frame adjustment is to delete 20 original frames for each character. When the voiced sound signal section Z2 of the character sound signal Sp1 of a word Wo has 100 original sound frames, the adjustment unit 130 will delete the sound signal of one original sound frame every five original sound frames for the voiced sound signal section Z2 deal with.

In some embodiments, the adjustment unit 130 can calculate each word according to the total adjustment time, the unit sound frame time, and the number of processing (that is, the number of word sounds with voiced sound signal segment Z2 in the word sound signals Sp1-Sp7). Wo is to remove the original frame adjustment of the original frame, and then delete the original frame of the frame adjustment from each word sound signal having the voiced sound signal section Z2. In some embodiments, after the frame adjustment amount, the adjusting unit 130 first confirms whether the number of voice frames of the voiced signal segment Z2 of the word sound signal having the voiced signal segment Z2 is greater than the current frame adjustment amount. When both are greater than, the adjusting unit 130 deletes the sound frame. On the contrary, the adjustment unit 130 excludes the phonetic signals smaller than that to obtain a new processing amount and recalculates the frame adjustment amount.

In another embodiment of step S23, the adjustment unit 130 inserts a sound frame (hereinafter referred to as a supplementary sound frame) at fixed intervals into the voiced signal segment Z2 by inserting a sound frame with a sound frame adjustment amount, so as to form a sound frame relative to The original speech signal Si is the adjusted speech signal So with the speech speed slowed down.

For example, assume that the frame adjustment amount is to add 20 supplementary frames to each character. When there are 100 original sound frames in the voiced sound signal section Z2 of the character sound signal Sp1 of a word Wo, the adjustment unit 130 performs sound signal processing of inserting one supplementary sound frame into every five original sound frames for the voiced sound signal section Z2 .

In some embodiments, the inserted supplementary frame is related to at least one original frame adjacent to the insertion position in the voiced signal segment Z2. In one embodiment, the supplementary sound frame to be inserted may be the average of the original sound frames adjacent to the insertion position in the voiced signal section Z2. For example, following the previous example, the adjustment unit 130 inserts a supplementary value obtained by averaging the fifth original sound frame and the sixth original sound frame between the fifth original sound frame and the sixth original sound frame of the voiced sound signal section Z2. sound frame. In another embodiment, the inserted supplementary sound frame may be the previous original sound frame at the inserted position in the voiced signal segment Z2. For example, following the previous example, the adjustment unit 130 inserts a supplementary sound frame obtained by copying the fifth original sound frame between the fifth original sound frame and the sixth original sound frame of the voiced signal section Z2. In yet another embodiment, the inserted supplementary frame may be the next original frame at the inserted position in the voiced signal segment Z2. For example, following the previous example, the adjustment unit 130 inserts a supplementary sound frame obtained by duplicating the sixth original sound frame between the fifth original sound frame and the sixth original sound frame of the voiced signal section Z2. In other words, the adjustment unit 130 can adjust the manner of removing or inserting one or more sound frames per interval according to the actual situation, and the present invention is not limited thereto.

In some embodiments, the speech rate adjustment system 10 can further generate a voice-description image according to the adjusted speech signal So and a dynamic image. Wherein, the adjusted voice signal corresponds to the silent content in the dynamic image. In some embodiments, the dynamic image can be continuous pictures without sound (such as GIF, etc.) or original audio-visual video (such as movies or animations, etc.), and the generated audio description corresponds to continuous pictures with sound (such as GIF with sound, etc. ) or dictated video (e.g., dictated movies or dictated animations, etc.).

In some embodiments, the original audio signal Si and the adjusted audio signal So are individually used to provide an event description of an image content (ie, silent content) of a silent image in the original audiovisual video. Here, a silent image means that there are no people speaking and no dramatic sound effects (such as the sound of doors opening, or the sound of vehicles approaching, etc.) in the image content. In other words, the original voice signal Si and the adjusted voice signal So provide voice descriptions of changes in events such as character movements and/or scene changes in the silent video at different speech rates.

In some embodiments, please refer to FIG. 4 , the speech rate adjustment system 10 may further include: an audio and video processing unit 180 . The audio-video processing unit 180 is coupled to the storage unit 110 and the adjustment unit 130 . Here, referring to FIG. 4 and FIG. 5 , the audio-visual processing unit 180 can generate a spoken audio-visual video Vo according to the adjusted speech signal So and the original audio-visual video Vi (step S26 ).

In some embodiments of step S21 , the original voice signal Vi and the total adjustment duration N1 may be provided by an external device coupled to the speech rate adjustment system 10 , and/or input to the speech rate adjustment system 10 by the user through a user interface.

In some embodiments, please refer to FIG. 4 , the speech rate adjustment system 10 may further include: a converting unit 140 and a judging unit 150 . The conversion unit 140 is coupled to the storage unit 110 , and the determination unit 150 is coupled to the conversion unit 140 , the analysis unit 120 and the adjustment unit 130 .

In some embodiments of step S21 , referring to FIG. 4 and FIG. 5 , the conversion unit 140 receives the descriptive text XL corresponding to the silent content (step S11 ), and converts the descriptive text XL into the original speech signal Si (step S12 ). Wherein, the event description composed of these words Wo is recorded in the description text XL, and the event description is to describe the silent content in the original audio-visual video Vi.

After conversion, the converting unit 140 temporarily stores the generated original audio signal Si in the storage unit 110, and the judging unit 150 compares the total duration of the original audio signal Si with the total duration Tt of the silent content (step S13).

In some embodiments, the judging unit 150 determines whether the total duration of the original audio signal Si is greater than the total duration Tt of the silent content through the comparison step (step S13 ) (step S14 ).

When the total duration of the original audio signal Si is greater than the total duration Tt of the silent content, the judging unit 150 calculates the time difference between the total duration of the original audio signal Si and the total duration Tt of the silent content to obtain the total adjusted duration N1 (step S15), and provide it to the adjustment unit 130. Moreover, the judging unit 150 will also enable the analysis unit 120 to start analyzing the generated original speech signal Si, so that the adjustment unit 130 can generate an adjusted speech rate faster than the original speech signal Si according to the total adjustment duration N1 and the analysis result. The voice signal So (that is, continue to execute steps S22-S24).

When the total duration of the original audio signal Si is not greater than the total duration Tt of the silent content, the judging unit 150 will not enable the analysis unit 120 (that is, the execution of steps S22 - S24 will not proceed). At this time, if the speech rate adjustment system 10 has an audio-visual processing unit 180 , the judging unit 150 will cause the audio-visual processing unit 180 to generate a dictated audio-visual video Vo according to the original speech signal Si and the original audio-visual video Vi (step S26 ).

In some embodiments, referring to FIG. 4 and FIG. 6 , the judging unit 150 confirms whether the total duration of the original audio signal Si is equal to the total duration Tt of the silent content through the comparison step (step S13) (step S14').

When the total duration of the original audio signal Si is not equal to the total duration Tt of the silent content, the judging unit 150 calculates the time difference between the total duration of the original audio signal Si and the total duration Tt of the silent content to obtain the total adjustment time. length N1 (step S15 ), and provide it to the adjustment unit 130 . Moreover, the judgment unit 150 will also enable the analysis unit 120 to start analyzing the generated original speech signal Si, so that the adjustment unit 130 generates the adjusted speech signal So according to the total adjustment duration N1 and the analysis result (that is, continue to execute step S22 ~S24). Wherein, when the total duration of the original audio signal Si is greater than the total duration Tt of the silent content, the adjusting unit 130 generates an adjusted audio signal So whose speech rate is faster than that of the original audio signal Si (step S24 ). When the total duration of the original audio signal Si is less than the total duration Tt of the silent content, the adjustment unit 130 generates an adjusted audio signal So whose speech rate is slower than that of the original audio signal Si (step S24 ).

When the total duration of the original audio signal Si is equal to the total duration Tt of the silent content, the judging unit 150 will not enable the analysis unit 120 (that is, the execution of steps S22 - S24 will not be continued). At this time, if the speech rate adjustment system 10 has an audio-visual processing unit 180 , the judging unit 150 will cause the audio-visual processing unit 180 to generate a dictated audio-visual video Vo according to the original speech signal Si and the original audio-visual video Vi (step S26 ).

In some embodiments, the audio-visual processing unit 180 can combine the audio signal (that is, the original audio signal Si or the adjusted audio signal So) with the original audio-visual video Vi by mixing, replacing, or correlating to form the audio signal as a silent Audio, audio and video content Vo.

In one embodiment, the video processing unit 180 receives the original video Vi and separates the original video Vi into an original audio track and a silent video. Next, the audio-visual processing unit 180 mixes the original audio track and the voice signal (i.e., the original voice signal Si or the adjusted voice signal So) to form an adjusted audio track, and then adjusts the adjusted audio track and the silent image video synchronously. The audio track and the silent image video are combined to form a spoken audio-visual video Vo.

In another embodiment, the audiovisual processing unit 180 receives the original audiovisual video Vi and separates the original audiovisual video Vi into an original audio track and a silent image video. Then, the audio-visual processing unit 180 replaces the audio track segment corresponding to the playback time of the silent content in the original audio track with the voice signal to form an adjusted audio track, and then synchronizes the adjusted audio track with the silent image and video. Silent video and video are combined into audio and video audio and video Vo.

In yet another embodiment, the audiovisual processing unit 180 receives the original audiovisual video Vi and finds out the audio track segment corresponding to the silent content in the original audiovisual video Vi. Next, the audio-visual processing unit 180 creates a substitute signal for the audio-track segment of the voice signal, and generates a dictation video Vo containing the original video Vi, the voice signal, and the substitute signal. It is assumed that the audio track segment corresponding to the silent content is between the first playing time and the second playing time in the original audio track. At this time, during the playback of the audio-visual video Vo, the substitute signal will be triggered at the first playback time to change from the execution of the original audio track to the execution of the voice signal, and then switch back to the second audio signal from the original audio track at the second playback time. The playback time position is continued from the original track.

In some embodiments, semantic recognition may be performed first after the adjusted speech signal So is generated, and the adjusted speech signal So is output only when the semantics of the adjusted speech signal So can be recognized.

In some embodiments, please refer to FIG. 4 , the speech rate adjustment system 10 may further include: an identification unit 160 and an update unit 170 . The identifying unit 160 is coupled to the adjusting unit 130 and the updating unit 170 .

Referring to FIG. 4 and FIG. 5 or FIG. 4 and FIG. 6, after the adjustment unit 130 generates the adjusted speech signal So, the recognition unit 160 will first detect the semantics of the adjusted speech signal So (step S25) to confirm whether the semantics can be recognized (That is, to confirm whether the content of the voice played after the adjusted voice signal So is recognizable). Here, the semantic detection technology is well known to those skilled in the art, so it will not be repeated here.

When the semantics is not recognizable, the recognition unit 160 does not output the adjusted speech signal So, and causes the update unit 170 to update the description text to reduce the number of words constituting the event description (step S27 ). Then, the update unit 170 provides the updated descriptive text to the conversion unit 140 for conversion (that is, step S12 is continued). At this time, if the speech rate adjustment system 10 has an audio-visual processing unit 180 , the recognition unit 160 will not output the generated adjusted speech signal So to the audio-visual processing unit 180 .

When the semantics are recognizable, the recognition unit 160 outputs the adjusted speech signal So. At this time, if the speech rate adjustment system 10 has an audio-visual processing unit 180 , the recognition unit 160 will output the adjusted speech signal So to the audio-visual processing unit 180 for audio-visual processing (that is, execute step S26 ).

In some embodiments, the storage unit 110 , the analysis unit 120 , the adjustment unit 130 , the conversion unit 140 , the judgment unit 150 , the identification unit 160 , the update unit 170 and the audio-visual processing unit 180 can be realized by a single or multiple processing components.

In some embodiments, the original speech signal Si and the adjusted speech signal So can provide the corresponding speech of the silent content in the silent continuous picture. In other words, the original speech signal Si and the adjusted speech signal So provide speech with the same content but different speech rates. For example, the continuous pictures without sound can present the lip changes of the pronunciation of a word or sentence, and the original speech signal Si and the adjusted speech signal So provide the pronunciation of the word or sentence.

In some embodiments, please refer to FIG. 7 , the speech rate adjusting system 10 may further include: a merging unit 190 . The merging unit 190 is coupled to the adjustment unit 130 . Referring to FIG. 7 and FIG. 8, the merging unit 190 receives a silent continuous picture Mi, and combines the adjusted speech signal So and the silent continuous picture Mi into a sound continuous picture Mo by synchronizing the adjusted speech signal So and the silent continuous picture Mi (step S26').

In some embodiments, the storage unit 110 , the analyzing unit 120 , the adjusting unit 130 and the merging unit 190 can be realized by a single or multiple processing components.

In some embodiments, the storage unit 110 can be realized by a single or multiple memories. The aforementioned processing components can be microprocessors, microcontrollers, central processing units, programmable logic controllers, logic circuits, analog circuits, digital circuits, or any analog and/or digital devices that operate signals based on operation instructions.

In some embodiments, the speech rate adjusting method of any embodiment can be realized by a computer program product, so that the speech rate adjusting method of any embodiment can be completed after the computer loads the program and executes it. In some embodiments, the computer program product may be a non-transitory recording medium, and the above-mentioned programs are stored in the non-transitory recording medium for the computer to load. In some embodiments, the above program itself can be a computer program product, and can be transmitted to the computer via wired or wireless means.

To sum up, the speech rate adjustment method of any embodiment is suitable for adjusting the speech rate of the speech signal to provide an audio file that satisfies the time limit, thereby reducing the number of repeated recordings and greatly reducing the production cost of the audio file.

10:Speech adjustment system 110: storage unit 120: Analysis unit 130: Adjustment unit 140: conversion unit 150: judgment unit 160: Identification unit 170: update unit 180: AV processing unit 190: merge unit Si: original voice signal N1: total adjustment time So: Adjusted voice signal Wo: word Sp1~Sp7: word tone signal F1: Speech Waveform F2: Sound Spectrum Z1: Unvoiced signal section Z2: voiced signal section Vi: original audio and video Vo: dictation audio-visual video Mi: Continuous picture without sound Mo: continuous picture with sound XL: Descriptive text Tt: Total duration of silent content S21~S27: Steps S11~S15: Steps S14': step S26': step

Fig. 1 is a flowchart of a speech rate adjustment method in some embodiments. FIG. 2 is a functional block diagram of a speech rate adjustment system in some embodiments. FIG. 3 is a schematic diagram of an original speech signal according to an embodiment. FIG. 4 is a functional block diagram of a speech rate adjustment system in some embodiments. Fig. 5 is a flowchart of a speech rate adjustment method in some embodiments. Fig. 6 is a flowchart of a speech rate adjustment method in some embodiments. FIG. 7 is a functional block diagram of a speech rate adjustment system in some embodiments. Fig. 8 is a flowchart of a speech rate adjustment method in some embodiments.

S21~S24: Steps

Claims (10)

A method for adjusting speech rate, comprising: Obtain an original voice signal and a total adjustment duration of complex numbers; analyzing the original speech signal to obtain a voiced signal segment and an unvoiced signal segment corresponding to each of the characters; calculating a sound frame adjustment amount according to the total adjustment duration and a unit sound frame duration; and A frame quantity of at least one of the voiced signal segments is adjusted according to the frame adjustment amount to form an adjusted speech signal. The speech rate adjustment method as described in claim 1, wherein the step of adjusting a frame number of at least one of the voiced signal segments according to the frame adjustment amount to form an adjusted speech signal includes: Remove at least one original sound frame corresponding to the sound frame adjustment amount from the at least one voiced signal segment according to a fixed interval, or insert at least one supplementary sound frame corresponding to the sound frame adjustment amount, so as to form a voice different from the original sound The adjusted speech signal of the speech rate of the signal, wherein the at least one supplementary frame is related to the at least one original frame adjacent to the insertion position. The speech rate adjustment method as described in claim item 1, further comprising: A voice-description image is generated according to the adjusted voice signal and a dynamic image, wherein the adjusted voice signal corresponds to a silent content in the dynamic image. The speech rate adjustment method as described in claim 3, wherein the steps of obtaining the original speech signal of the complex number and the total adjustment duration include: receiving a description text, wherein an event description of the silent content composed of the plural numbers is recorded in the description text; and Converting the description text into the original audio signal, wherein the total adjusted duration is a time difference between the total duration of the original audio signal and the total duration of the silent content. The speech rate adjustment method as described in claim item 4, further comprising: judging whether a semantic meaning of the adjusted speech signal is recognizable; When the semantics of the adjusted voice signal is not recognizable, reduce the number of words constituting the plural number of the event description in the description text, convert the updated description text into the original voice signal, and continue to analyze the original voice signal to obtain the step of the voiced signal segment and the unvoiced signal segment corresponding to each of the characters; and When the semantic meaning is recognizable, the adjusted voice signal is output. A speech rate adjustment system, comprising: a storage unit temporarily storing an original voice signal of complex numbers; An analysis unit, coupled to the storage unit, analyzes the original speech signal to obtain a voiced signal segment and an unvoiced signal segment corresponding to each character; and An adjustment unit, coupled to the storage unit and the analysis unit, calculates a frame adjustment amount according to a total adjustment duration and a unit frame duration, and adjusts the voiced sound signals of the characters according to the frame adjustment amount A frame number of at least one of the segments to form an adjusted speech signal. The speech rate adjustment system as described in claim 6, further comprising: A merging unit, coupled to the adjustment unit, receives a continuous picture without sound, and combines the adjusted voice signal with the continuous picture without sound to form a continuous picture with sound. The speech rate adjustment system as described in claim 6, further comprising: An audio-visual processing unit, coupled to the adjustment unit, generates a dictated audio-visual video according to the adjusted audio signal and an original audio-visual video, wherein the adjusted audio-visual signal is used to provide an event description of a silent content in the original audio-visual video. The speech rate adjustment system as described in Claim 8, further comprising: A converting unit, coupled to the storage unit, receives a descriptive text, and converts the descriptive text into the original voice signal, wherein the descriptive text records the event description composed of the plural numbers and the total adjustment time is the time difference between the total duration of the original voice signal and the total duration of the silent content. The speech rate adjustment system as described in Claim 9, further comprising: a recognition unit, coupled to the adjustment unit, to determine whether a semantic meaning of the adjusted speech signal is recognizable; and An update unit, coupled to the recognition unit and the conversion unit, updates the description text to reduce the number of words constituting the complex number of the event description when the semantics is not recognizable, and provides the updated description text to the The conversion unit performs the conversion.

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