JPS63209323A - Voice signal a/d conversion system - Google Patents

Abstract

PURPOSE:To attain the balanced reproduction with a voice level by setting the maximum digital voice data after A/D conversion to a prescribed constant and converting all the voice data while keeping the entire correlation. CONSTITUTION:A voice data maximum setting value (c) is inputted from a keyboard 3 at first. The value is a value to convert the digital maximum value of the analog voice signal 1 and decided in the full scale range of the A/D converter 2. Then the signal 1 is inputted to a voice data processing section 4 via the converter 2. The processing section 4 retrieves the maximum value of the signal 1 and multiplies the ratio to the setting value (c) with all data and the result is stored in a voice data base 5. Thus, the dispersion of the level of plural kinds of voice is avoided and reproduced in a natural form balanced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an A/D conversion system for audio signals, and in particular to the processing of data to be stored in an audio database.

[Conventional technology]

Conventionally, when an audio signal is A/D converted into a digital audio signal, a sufficient margin is provided so that the peak value of the input audio signal falls within the full scale range of the A/D converter.

[Problem that the invention seeks to solve]

In this way, in the conventional audio signal A/D conversion system, when the audio signal is A/D converted, the full scale of the audio analog signal does not match the full scale of the digital signal after conversion, and the data is converted into digital data. was stored in the voice database. For this reason, several types of audio can be A/D
In the case of conversion, the level of digital audio data obtained by A/D conversion differs from one to another, so when audio is reproduced from data in the audio database, unnaturalness due to variations in volume will be heard. When inputting voice data, if the level of the peak value is kept constant and input manually, the above problem will not occur, but in the case of input using human voice, it is necessary to keep the level of human input constant. It is extremely difficult to import digital data of several types of audio in a balanced manner.

[Means for solving problems]

The audio signal A/D conversion system of the present invention was made to solve the above problems, and converts analog audio signals into A/D converters.
Audio data processing that calculates the ratio between the A/D converter that performs /D conversion and the maximum output value of the A/D converter with respect to a preset reference value, and multiplies this ratio by the digital audio data to perform numerical conversion. and an audio database that stores the processed data.

[Effect]

The data stored in the voice database has the same maximum value for all human voice signals, and
Each input audio signal is stored as digital data having a correlation corresponding to its amplitude waveform.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a conceptual diagram of the configuration of the embodiment, where 1 is an analog audio signal and 2 is an A/D converter. 4 is an audio data processing unit which manually inputs the output of the A/D converter 2, and
Enter the digital audio data maximum setting value, which will be described later, from the keyboard 3. 5 is a voice database.

FIG. 2 is an analog representation of the digital audio data waveform, and the operation of the system will be explained with reference to this diagram.

First, enter the digital audio data maximum setting value C on the keyboard 3.
are input to the audio data processing unit 4 and set. This value C is a value to which the maximum digital value of the analog audio signal is to be converted, and is set within the full scale range a of the A/D converter 2. Next, the analog audio signal 1 is input to the A/D converter 2, and the audio data processing section 4 inputs its output 2af:.

The signal 6 indicated by a solid line in FIG. 2 represents the output 2a. The audio data processing section 4 searches for and obtains the maximum value of the signal 6, and calculates the ratio C/b't'' with the digital audio data maximum setting value C set in the audio data processing section 4. is multiplied by all data of signal 7 to obtain all data of signal 7. This data of signal 7 is stored in audio database 5.

〔Effect of the invention〕

As explained above, according to the present invention, although the input level of several types of analog audio signals input by human voice varies, the maximum value of digital audio data after A/D conversion can be adjusted to a certain level. By setting it to a constant value and converting all the audio data while maintaining the overall correlation,
This has the effect of avoiding variations in the level of several types of audio in the output digital audio data and allowing it to be played back in a balanced and natural manner.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram of the configuration of an embodiment of the present invention, and FIG. 2 is a waveform diagram of digital audio data. 2... A/D converter, 3... Keyboard, 4...
...Audio data processing unit, 5...Audio database, 6...Digital audio signal (converted from analog audio signal), 7...Digital audio signal (after maximum level investigation conversion). % Applicant NEC Corporation

Claims (1)

[Claims] Calculate the ratio between the A/D converter that A/D converts the analog audio signal and the maximum output value of the A/D converter with respect to a preset reference value, and multiply the digital audio data by this ratio to convert it into a numerical value. 1. An audio signal A/D conversion system comprising: an audio data processing section; and an audio database storing the processed data.