KR101387912B1 - Method and apparatus for sending and receiving an audio signal - Google Patents

Abstract

The present invention relates to a method and apparatus for transmitting and receiving voice signals.
The voice signal transmission method according to an embodiment of the present invention comprises the steps of generating a clock signal, converting an electrical voice signal into a PCM data-ized voice signal, and converting a PCM data-ized voice signal into an encoded voice signal Include.
In accordance with another aspect of the present invention, an apparatus for transmitting a voice signal includes a clock signal generator for generating a clock signal, an audio coding unit for receiving a clock signal and converting an electrical sound signal into a PCM dataized voice signal, and receiving a clock signal. And an encoding unit for converting the PCM dataized speech signal into an encoded speech signal.

Description

Method and apparatus for transmitting and receiving voice signals {METHOD AND APPARATUS FOR SENDING AND RECEIVING AN AUDIO SIGNAL}

The present invention relates to a method and apparatus for transmitting and receiving voice signals.

Public address (PA) systems that provide announcements in buildings, factories, and ships are usually equipped with microphones in the body and separate microphones are installed at long distances.

However, microphones of all-optical broadcasting systems are vulnerable to electromagnetic noise because they generate voice signals with minute currents. The microphone installed in the main unit has a short wiring distance between the microphone and the main unit, and does not generate noise in the surrounding influences such as electromagnetic noise. There is a problem such as the need to use expensive wiring shielded because there is a problem that noise is easily exposed to noise.

The technical problem to be achieved by the present invention relates to a method and apparatus for transmitting and receiving a voice signal resistant to noise even at a long distance.

The voice signal transmission method according to an embodiment of the present invention comprises the steps of generating a clock signal, converting an electrical voice signal into a PCM data-ized voice signal, converting the PCM data-ized voice signal into an encoded voice signal It includes.

In accordance with another aspect of the present invention, an apparatus for transmitting a voice signal includes a clock signal generation unit for generating a clock signal, an audio coding unit for receiving the clock signal and converting an electrical sound signal into a PCM dataized voice signal, and converting the clock signal. And an encoding unit configured to receive and convert the PCM dataized speech signal into an encoded speech signal.

A voice signal receiving method according to another embodiment of the present invention includes converting an encoded voice signal into a PCM dataized voice signal, and converting the PCM dataized voice signal into an electrical voice signal.

An apparatus for receiving a voice signal according to still another embodiment of the present invention includes a decoding unit for converting an encoded voice signal into a PCM dataized voice signal, and an audio decoding unit for converting the PCM dataized voice signal into an electrical voice signal.

According to the method and apparatus for transmitting and receiving a voice signal according to an embodiment of the present invention, the following effects are obtained.

First, the method and apparatus for transmitting and receiving voice signals according to the present invention are strong in noise, so that a user can hear sound with little noise.

Second, there is an advantage in that the voice data of one channel is acquired from the PCM data-voiced voice signal of one channel and the transmission time of the acquired voice data can be doubled.

Third, the encoded code in the encoding unit according to the present invention is strong against noise because electromagnetic data is introduced and the data value is determined with the overall holding time and ratio.

1 is a block diagram showing an apparatus for transmitting a voice signal according to an embodiment of the present invention.
2 is a diagram illustrating a data format output from an audio coding unit according to an embodiment of the present invention.
3 is a diagram for describing obtaining specific data in an encoding unit according to an embodiment of the present invention.
FIG. 4 is a diagram for describing timing of acquiring and transmitting specific data by an encoding unit according to an embodiment of the present invention.
5 illustrates a PCM dataized voice signal output from an audio coding unit according to an embodiment of the present invention.
6 is a diagram for describing a method of encoding in an encoding unit according to an embodiment of the present invention.
7 is a diagram for describing a method of encoding in an encoding unit according to an embodiment of the present invention.
8 is a flowchart illustrating a voice signal transmission method according to an embodiment of the present invention.
9 is a block diagram illustrating an apparatus for receiving a voice signal according to an embodiment of the present invention.
10 is a flowchart illustrating a voice signal receiving method according to an embodiment of the present invention.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. However, it is to be understood that the present invention is not limited to the disclosed embodiments, but may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. It is intended that the disclosure of the present invention be limited only by the terms of the appended claims.

Also, terms used herein are for the purpose of illustrating embodiments and are not intended to limit the invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. &Quot; comprises "and / or" comprising "used in the specification do not exclude the presence or addition of components other than the components mentioned. Unless defined otherwise, all terms (including technical and scientific terms) used herein may be used in a sense commonly understood by one of ordinary skill in the art to which this invention belongs.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram illustrating an apparatus for transmitting a voice signal according to an embodiment of the present invention, and FIGS. 2 to 7 are views for explaining an apparatus for transmitting a voice signal according to an embodiment of the present invention. Do it at

1 to 7, an apparatus for transmitting a voice signal according to an embodiment of the present invention includes a microphone 110, a clock signal generator 120, an audio coding unit 130, an encoding unit 140, and a differential signal. The generation unit 150 is included.

The microphone 110 is a part that generates an electrical voice signal when a person speaks a voice that is the sound of the word. That is, the microphone 110 converts the voice into an analog electric voice signal. In the present invention, the microphone 110 is described based on a mono microphone, but it should be noted that the present invention is not limited thereto.

The clock signal generator 120 is a part for generating a clock signal. The clock signal includes a left and right display signal for displaying the left channel and the right channel for the right and a synchronization signal for synchronizing the signal in one cycle.

For example, the left and right display signals of the clock signal may include two channel data in one cycle. The left channel may be referred to as a reference voltage level, and the right channel may be referred to as a high voltage level. Can be. When the audio coding unit 130 is configured in stereo, it may be represented as a left channel and a right channel according to the state of the left and right display signals. Among the clock signals, the synchronization signal is a signal in which a reference voltage level and a high voltage level are applied constantly to synchronize synchronization of one bit of PCM data from the left and right display signals.

The audio coding unit 130 receives a left and right display signal, which is a clock signal, and a synchronization signal from the clock signal generation unit 120, and converts the electrical voice signal received from the microphone 110 into a PCM dataized voice signal. . In the present invention, the audio signal output from the PCM data output format by the audio coding unit 130 is defined as the PCM data-ized voice signal.

2 is a diagram illustrating a data format output from an audio coding unit according to an embodiment of the present invention.

Referring to FIG. 2, the PCM data is output one bit at a time when the state of the left and right display signals is reversed in such a manner that an analog signal of the microphone 110 is digitally sampled and outputs a sampled digital value. In this case, in the present invention, the audio coding unit 130 outputs an electrical voice signal as a PCM dataized voice signal. At this time, the PCM data in the left channel or the right channel may have a size suitable for the situation of each device or system, such as 8 bits, 16 bits, and 32 bits. Here, the PCM data has a value that is not necessary until all the bits are output in accordance with the synchronization signal until the state of the left and right display signals changes.

The encoder 140 receives a clock signal from the clock signal generator 120 and converts the PCM data-ized voice signal received from the audio coding unit 130 into an encoded voice signal. In the present invention, the speech signal encoded and output by the encoding unit 140 is defined as an encoded speech signal.

3 is a diagram for describing obtaining specific data in an encoding unit according to an embodiment of the present invention.

Referring to FIG. 3, the encoding unit 140 of the present invention ignores PCM data of one channel (for example, right channel) among the PCM data (PCM data voice signal) output from the audio coding unit 130. Only PCM data of the other channel (e.g., left channel) is acquired. This is because the public address microphone 110 generally uses a mono microphone, which is different from the conventional left channel and right channel.

FIG. 4 is a diagram for describing timing of acquiring and transmitting specific data by an encoding unit according to an embodiment of the present invention.

Referring to FIG. 4, the encoding unit 140 acquires (or obtains) data 1, which is PCM data (PCM data-voiced voice signal), in front of the left channel 1, and stores data 2 in the left channel 2 of the next voice data. Acquire. Since data 1 needs to be transmitted only until the acquisition of data 2 is completed, the transmission time of data 1 can be equal to the time of left channel 1 plus right channel 1.

This means that when both the left channel and the right channel are used, the transmission of the acquired data must be transmitted within the time of acquiring the data of the next channel. There is an advantage that can double the transmission time of the voice data.

5 illustrates a PCM dataized voice signal output from an audio coding unit according to an embodiment of the present invention.

Referring to FIG. 5, the audio coding unit 130 represents a data value as a digital binary value, data “0” is represented by a reference voltage level, and data “1” is represented by a high voltage level. At this time, t0, t1, t2, t3, t4, t5, t6, t7 all have the same time interval. That is, if the magnitude of the voltage is a reference voltage level at a constant time, the data is “0”. If the magnitude of the voltage is a high voltage level, the data is “1”. In the case of the digital value expression method according to the magnitude of the voltage, when the state value is acquired, it is very vulnerable to noise because it is not able to obtain the correct value but the wrong value can be obtained.

Therefore, in the present invention, the encoding unit 140 performs encoding in a new manner.

6 is a diagram for describing a method of encoding in an encoding unit according to an embodiment of the present invention.

Referring to FIG. 6, the encoding unit 140 encodes data “0” into a reference voltage level and a high voltage level, but encodes a sustain time of a high voltage level longer than a sustain time of a reference voltage level, and data “1”. Encodes the reference voltage level and the high voltage level, but encodes the holding time of the reference voltage level longer than the holding time of the high voltage level.

For example, the encoding unit 140 encodes data “0” into a reference voltage level and a high voltage level, but encodes the holding time of the high voltage level at twice the holding time of the reference voltage level. The reference voltage level and the high voltage level may be encoded, but the retention time of the reference voltage level may be encoded as twice the retention time of the high voltage level.

As such, the encoded code in the encoding unit 140 according to the present invention is strong against noise because electromagnetic data is introduced and the data value is determined based on the overall holding time and ratio of tA, tB, tC, and tD.

7 is a diagram for describing a method of encoding in an encoding unit according to an embodiment of the present invention.

Referring to FIG. 7, for example, when data is “10110010”, the data and the encoding unit 140 of the PCM data-ized voice signal output from the audio coding unit 130 and before being encoded by the encoding unit 140 may be used. It shows the data of the encoded speech signal after being encoded.

 The differential signal generator 150 converts the encoded voice signal output from the encoder 140 into a differential voice signal. By transmitting the encoded voice signal as a differential signal, noise may be overcome in transmitting the voice signal of the microphone 110 at a long distance.

8 is a flowchart illustrating a voice signal transmission method according to an embodiment of the present invention. In the voice signal transmission method of FIG. 8, the contents of FIGS. 2 to 7 described above are applied in the same manner and detailed descriptions thereof will be omitted.

Referring to FIG. 8, in a method of transmitting a voice signal according to an embodiment of the present invention, when a user speaks with a microphone 110, the microphone 110 generates an electrical voice signal from a voice that is a human speech and generates an audio coding unit. Transmit to 130 (S110).

The clock signal generator 120 generates a clock signal including left and right display signals and a synchronization signal, and transmits the generated clock signal to the audio coding unit 130 and the encoding unit 140 (S120).

The audio coding unit 130 receives the clock signal from the clock signal generator 120, converts the electrical voice signal into a PCM dataized voice signal, and transmits the converted voice signal to the encoding unit 140 (S130).

The encoder 140 receives the clock signal from the clock signal generator 120, converts the PCM data-ized voice signal into the encoded voice signal, and transmits the converted voice signal to the differential signal generator 150 (S140).

At this time, the encoding unit 140 obtains the PCM dataized voice signal from one of the left channel and today's channel. For example, if the PCM dataized voice signal of the left channel is obtained, the transmission time of the left channel is obtained. And transmits PCM dataized voice signal for the entire time of the right channel.

In addition, the encoding unit 140 encodes data “0” into a reference voltage level and a high voltage level, but encodes a maintenance time of a high voltage level longer than a maintenance time of a reference voltage level, and data “1” represents a reference voltage level. And encodes at a high voltage level, but the maintenance time of the reference voltage level is longer than the maintenance time of the high voltage level. For example, the encoding unit 140 encodes data “0” into a reference voltage level and a high voltage level, but encodes the holding time of the high voltage level at twice the holding time of the low voltage level, and the data “1”. Encodes the reference voltage level and the high voltage level, but the encoding time can be encoded by twice the holding time of the high voltage level.

The differential signal generation unit 150 converts the encoded speech signal into a differential speech signal (S150). Thereafter, the differential signal generator 150 transmits the encoded voice signal to the differential voice signal (S160).

9 is a block diagram illustrating an apparatus for receiving a voice signal according to an embodiment of the present invention, and FIG. 10 is a flowchart illustrating a method for receiving a voice signal according to an embodiment of the present invention.

9 and 10, an apparatus and a method for receiving a voice signal according to an embodiment of the present invention will be described.

The apparatus for receiving a voice signal according to an exemplary embodiment of the present invention includes a differential signal decoding unit 210, a decoding unit 220, a clock signal generator 230, an audio decoding unit 240, and a sticker 250.

The differential signal decoding unit 210 receives the differential speech signal from the outside (S210) and converts the differential speech signal into an encoded speech signal (S220).

The decoding unit 220 converts the encoded voice signal received from the differential signal decoding unit 210 into a PCM data-based sound signal (S230). At this time, the decoding unit 220 transmits the clock information for generating the clock signal to the clock signal generation unit 230.

The clock signal generator 230 receives the clock signal from the decoder 220 to generate a clock signal, and transmits the generated clock signal to the audio decoder 240 (S240).

The audio decoding unit 240 converts the PCM data converted voice signal received from the decoding unit 220 into an electrical voice signal using the clock signal received from the clock signal generator 230 (S250).

The speaker 250 receives an electric voice signal from the audio decoding unit 240 and outputs sound from the electric voice signal (S260). At this time, the sound means that the user's voice comes out through the speaker 250.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be appreciated that one embodiment is possible. Accordingly, the true scope of the present invention should be determined by the technical idea of the claims.

110: microphone
120: clock signal generation unit
130: audio coding unit
140:
150: differential signal generator
210: differential signal decoding unit
220:
230: clock signal generation unit
240: audio decoding unit
250: speaker

Claims (17)

Generating a clock signal,
Converting the electrical voice signal into a PCM dataized voice signal;
And converting the PCM dataized voice signal into an encoded voice signal. The method of claim 1,
Converting the encoded speech signal into a differential speech signal. 3. The method of claim 2,
Generating the electrical voice signal from sound. The method of claim 1,
Converting the PCM data-ized speech signal into an encoded speech signal,
A voice signal transmission method for acquiring the PCM dataized voice signal from one of a left channel and a right channel. 5. The method of claim 4,
Converting the PCM data-ized speech signal into an encoded speech signal,
And acquiring the PCM data voice signal of the left channel and transmitting the PCM data voice signal for the transmission time of the left channel and the entire time of the right channel. The method of claim 1,
Converting the PCM data-ized speech signal into an encoded speech signal,
The data “0” is encoded into a reference voltage level and a high voltage level, and the encoding time is longer than the holding time of the reference voltage level.
And a data "1" is encoded into the reference voltage level and the high voltage level, and the encoding time is longer than the holding time of the high voltage level. The method of claim 1,
Converting the PCM data-ized speech signal into an encoded speech signal,
The data "0" is encoded into a reference voltage level and a high voltage level, and the holding time of the high voltage level is encoded by twice the holding time of the reference voltage level.
And a data “1” is encoded into the reference voltage level and the high voltage level, and the holding time of the reference voltage level is encoded to twice the holding time of the high voltage level. The method of claim 1,
The clock signal includes a left and right display signal and a synchronization signal. A clock signal generator for generating a clock signal;
An audio coding unit which receives the clock signal and converts the electrical voice signal into a PCM dataized voice signal;
And an encoding unit for receiving the clock signal and converting the PCM dataized voice signal into an encoded voice signal. 10. The method of claim 9,
And a microphone for generating the electrical voice signal from sound. 11. The method of claim 10,
And a differential signal generator for converting the encoded voice signal into a differential voice signal. Converting the encoded speech signal into a PCM dataized speech signal;
And converting the PCM dataized voice signal into an electrical voice signal. The method of claim 12,
And generating a clock signal from the clock information. 14. The method of claim 13,
Converting the differential speech signal into the encoded speech signal. A decoding unit for converting the encoded speech signal into a PCM dataized speech signal;
And an audio decoding unit for converting the PCM dataized voice signal into an electrical voice signal. 16. The method of claim 15,
And a clock signal generator for generating a clock signal from the clock information. 17. The method of claim 16,
And a differential signal decoding unit for converting the differential speech signal into the encoded speech signal.

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