JPH0157360B2 - - Google Patents
Info
- Publication number
- JPH0157360B2 JPH0157360B2 JP57187209A JP18720982A JPH0157360B2 JP H0157360 B2 JPH0157360 B2 JP H0157360B2 JP 57187209 A JP57187209 A JP 57187209A JP 18720982 A JP18720982 A JP 18720982A JP H0157360 B2 JPH0157360 B2 JP H0157360B2
- Authority
- JP
- Japan
- Prior art keywords
- parameters
- audio
- quantizing
- present
- difference
- 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.)
- Expired
Links
- 238000013139 quantization Methods 0.000 claims description 6
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 238000001228 spectrum Methods 0.000 claims description 2
- 230000005236 sound signal Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000009499 grossing Methods 0.000 description 2
- 238000007781 pre-processing Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
Description
【発明の詳細な説明】
〔発明の分野〕
本発明は音声信号の情報圧縮装置に関し、音声
認識や音声出力を行うことを目的として、音声信
号から音声の特徴パラメータを抽出し、その時系
列を量子化して出力、転送又は記憶する如き装置
に関する。[Detailed Description of the Invention] [Field of the Invention] The present invention relates to an information compression device for audio signals, and relates to an information compression device for audio signals, which extracts audio feature parameters from audio signals and converts their time series into quantum It relates to a device that outputs, transfers, or stores the converted data.
従来よりPARCORパラメータ等の特徴パラメ
ータによつて音声信号をを情報圧縮してメモリに
記憶しておき、所望の音声に対応するパラメータ
をメモリから読出して復元合成して音声出力する
ことが行なわれている。
Conventionally, the information of an audio signal is compressed using characteristic parameters such as PARCOR parameters and stored in memory, and the parameters corresponding to the desired audio are read out from the memory, restored and synthesized, and output as audio. There is.
この場合、充分な精度を出すためには、各パラ
メータを表わすビツト数を大きくする必要があ
り、そのためメモリ容量が大きくなり、コスト・
アツプ、アクセス時間の短縮困難、ひいては合成
処理速度の低下を招き、かえつて自然な音声の合
成を困難にするという問題がある。 In this case, in order to achieve sufficient accuracy, it is necessary to increase the number of bits representing each parameter, which increases memory capacity and costs.
This poses a problem in that it makes it difficult to shorten the access time and slow down the synthesis processing speed, making it even more difficult to synthesize natural speech.
本発明は特徴パラメータを少ないビツト数で、
かつ充分な高精度で表現することを目的とする。
即ち特徴パラメータをさらに情報圧縮することを
目的とする。
The present invention provides feature parameters with a small number of bits,
The purpose is to express it with sufficient precision.
That is, the purpose is to further compress the information of the feature parameters.
本発明は、音声スペクトルは周波数方向への変
化が滑らかであることに注目し、隣接周波数との
差を抽出して量子化することを特徴とする。
The present invention is characterized by paying attention to the fact that the audio spectrum changes smoothly in the frequency direction, and extracting and quantizing the difference between adjacent frequencies.
図は本発明の（一）実施例のブロツク図を示
す。入力音声Dinは前処理部１を介して多数のバ
ンドパスフイルタ２にて周波数成分毎に分けら
れ、夫々を整流平滑回路３にて平滑して振幅強度
を示す信号f1〜fnとする。
The figure shows a block diagram of the first embodiment of the present invention. Input audio Din is passed through a preprocessing section 1 and divided into frequency components by a large number of bandpass filters 2, each of which is smoothed by a rectifier and smoothing circuit 3 to produce signals f1 to fn indicating amplitude intensity.
従来装置ではこのf1〜fnを適当な量子化精度で
量子化し、送出，記憶，転送等に供していた。し
かし、本発明では隣接するf1〜fnの差を減算器５
にて求め、その差を量子化回路４で量子化する。 In the conventional device, these f 1 to fn were quantized with appropriate quantization accuracy and used for transmission, storage, transfer, etc. However, in the present invention, the difference between adjacent f 1 to fn is calculated by the subtractor 5
, and the difference is quantized by the quantization circuit 4.
例えばパラメータP1はf1を、P2は（f2−f1）を、
P3は（f3−f2）を、…以下同様にPnは（fn−fn−
１）を量子化する。 For example, the parameter P 1 is f 1 , P 2 is (f 2 − f 1 ),
P 3 is (f 3 − f 2 ), ...Similarly, Pn is (fn−fn−
1) Quantize.
尚、各量子化回路４における量子化精度は同一
でもよいし、夫々のダイナミツクレンジに応じて
異ならせてもよい。また全体のダイナミツクレン
ジの時間変化に応じて各フレーム毎に変えてもよ
い。 Note that the quantization precision in each quantization circuit 4 may be the same or may be different depending on the respective dynamic ranges. Alternatively, it may be changed for each frame depending on the temporal change in the overall dynamic range.
〔発明の効果〕
以上の如く本発明では隣接する周波数成分の差
を量子化することにより、少ないビツト数で充分
な情報量の音声特徴パラメータを得ることができ
る。[Effects of the Invention] As described above, in the present invention, by quantizing the difference between adjacent frequency components, it is possible to obtain voice feature parameters with a sufficient amount of information using a small number of bits.
図は本発明の一実施例ブロツク図であり、１は
前処理部、２はバンドパスフイルタ、３は整流平
滑回路、４は量子化回路、５は減算器である。
The figure is a block diagram of one embodiment of the present invention, in which 1 is a preprocessing section, 2 is a bandpass filter, 3 is a rectifying and smoothing circuit, 4 is a quantization circuit, and 5 is a subtracter.
Claims (1)
装置において、 周波数スペクトルを表わす複数のパラメータに
ついて、同一時点での周波数方向に関して隣接す
るパラメータの差分を求める手段と、 該差分を適当な量子化精度で量子化する手段を
設けたことを特徴とする音声特徴パラメータの圧
縮装置。[Scope of Claims] 1. A device for quantizing a time series of voice characteristic parameters, comprising: means for determining a difference between adjacent parameters in the frequency direction at the same time point for a plurality of parameters representing a frequency spectrum; 1. A compression device for audio feature parameters, characterized by comprising means for quantizing with appropriate quantization accuracy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57187209A JPS5977498A (en) | 1982-10-25 | 1982-10-25 | Compression system for voice feature parameter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57187209A JPS5977498A (en) | 1982-10-25 | 1982-10-25 | Compression system for voice feature parameter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5977498A JPS5977498A (en) | 1984-05-02 |
| JPH0157360B2 true JPH0157360B2 (en) | 1989-12-05 |
Family
ID=16201991
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57187209A Granted JPS5977498A (en) | 1982-10-25 | 1982-10-25 | Compression system for voice feature parameter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5977498A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62271000A (en) * | 1986-05-20 | 1987-11-25 | 株式会社日立国際電気 | Encoding of voice |
| DE07003891T1 (en) | 2001-08-31 | 2007-11-08 | Kabushiki Kaisha Kenwood, Hachiouji | Apparatus and method for generating pitch wave signals and apparatus, and methods for compressing, expanding and synthesizing speech signals using said pitch wave signals |
| US7421304B2 (en) | 2002-01-21 | 2008-09-02 | Kenwood Corporation | Audio signal processing device, signal recovering device, audio signal processing method and signal recovering method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS574099A (en) * | 1980-06-10 | 1982-01-09 | Sanyo Electric Co | Voice recognizing device |
-
1982
- 1982-10-25 JP JP57187209A patent/JPS5977498A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS574099A (en) * | 1980-06-10 | 1982-01-09 | Sanyo Electric Co | Voice recognizing device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5977498A (en) | 1984-05-02 |
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