KR101742990B1 - System and method for transmitting sound - Google Patents

System and method for transmitting sound Download PDF

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Publication number
KR101742990B1
KR101742990B1 KR1020160023268A KR20160023268A KR101742990B1 KR 101742990 B1 KR101742990 B1 KR 101742990B1 KR 1020160023268 A KR1020160023268 A KR 1020160023268A KR 20160023268 A KR20160023268 A KR 20160023268A KR 101742990 B1 KR101742990 B1 KR 101742990B1
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KR
South Korea
Prior art keywords
bandwidth
signal
sound
wireless
wireless speaker
Prior art date
Application number
KR1020160023268A
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Korean (ko)
Inventor
송현석
Original Assignee
(유) 드림솔루션
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Priority to KR1020160023268A priority Critical patent/KR101742990B1/en
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Publication of KR101742990B1 publication Critical patent/KR101742990B1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/62—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for providing a predistortion of the signal in the transmitter and corresponding correction in the receiver, e.g. for improving the signal/noise ratio
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/0003—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/66—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for reducing bandwidth of signals; for improving efficiency of transmission
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2420/00—Details of connection covered by H04R, not provided for in its groups
    • H04R2420/07—Applications of wireless loudspeakers or wireless microphones

Abstract

An acoustic transmission system is disclosed. And a wireless speaker for receiving data through a wireless channel, converting the received data into an analog signal, and outputting the analog signal to a speaker, The transmitting terminal includes a plurality of sound pickups for picking up external audio signals, a comparator for comparing a plurality of sound recorder signals with threshold values, a selector for selecting a signal of the sound recorder exceeding a predetermined level, and a sound pick- And a transmitter for selecting only a signal and digitally converting the signal and transmitting the digital signal to the wireless speaker in accordance with the bandwidth. The wireless speaker processes the digital signal and converts the signal into an analog signal and outputs the digital signal. Therefore, the bandwidth can be maximized in the available frequency band, and the audio signal can be transmitted in real time.

Description

[0001] SYSTEM AND METHOD FOR TRANSMITTING SOUND [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a sound transmission method, and more particularly, to a sound transmission system and method for transmitting an audio signal with a minimized delay.

Recently, a speaker is widely used as a speaker constituting sound equipment. For example, when a mobile communication terminal transmits an audio signal to a wireless speaker through a Bluetooth communication or the like, the wireless speaker receives and outputs the audio signal. However, there is a problem in that a delay occurs in transmission of audio signals due to processes such as audio signal compression, audio signal encryption, audio signal conversion (A / D, D / A), etc. in a mobile communication terminal and a wireless speaker. Accordingly, there is a problem in that a difference occurs between the time when the audio signal is generated and the time when the audio signal is outputted through the wireless speaker, thereby causing a delay in the audio signal and deteriorating the sense of presence.

On the other hand, the present applicant has filed a sound collector for picking up sound, and this sound collector is also one of the sound equipment. A plurality of sound pickup units may be disposed around the instructor, and a terminal receiving a signal of the sound pickup unit may transmit audio signals using a wireless communication method. Accordingly, the terminal may require a constant bandwidth for wireless communication in order to process the audio signal generated by each sound collector.

Thus, it is necessary to provide a method for the terminal to transmit the audio signal quickly and effectively in consideration of the situation in which the surrounding environment becomes wireless.

Application No. 10-2007-0119777, Real Time Video / Sound Transmission System and Method on Low Performance Network Application No. 10-2010-0070426, a human sound transmission system and method for transmitting a plurality of signals

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and to provide a method and apparatus for adjusting a bandwidth corresponding to an amount of data to be transmitted and minimizing the processing of compression, So that the sound can be transmitted in a minimized manner.

According to an aspect of the present invention, there is provided a method for transmitting data over a wireless channel, comprising the steps of: comparing a bandwidth of an available frequency band to secure a bandwidth of the wireless channel to a maximum, receiving data through a wireless channel, And a wireless speaker for outputting to a speaker.

Here, the transmitting terminal may include a plurality of sound pickups for picking up an external audio signal, a comparator for comparing a plurality of sound recorder signals with a threshold value, a selector for selecting a signal of the sound recorder exceeding a predetermined level, And a transmission unit for selecting only a signal of the sound pickup unit and digitally converting the digital signal and transmitting the digital signal to the wireless speaker in accordance with the bandwidth, and the wireless speaker processes the digital signal and converts it into an analog signal and outputs it.

At this time, the transmitting terminal is a mobile communication terminal or a computer.

At this time, the wireless speaker is a Wi-Fi speaker or a Wi-Fi terminal.

According to another aspect of the present invention, there is provided a method for controlling a wireless terminal, the method comprising the steps of: connecting a wireless channel to a transmitting terminal; securing a bandwidth of a wireless channel as much as possible by comparing bandwidths of available frequency bands; Lt; / RTI > to the wireless speaker.

Wherein the transmitting terminal collects an external audio signal through a sound collector, compares the plurality of sound recorder signals with a threshold value, selects a signal of the sound collector exceeding a predetermined level, Selecting only the signal of the sound collector, digitally converting the signal of the sound collector installed in the bandwidth, and transmitting the digital signal to the wireless speaker in accordance with the bandwidth.

According to another aspect of the present invention, there is provided a wireless communication method including the steps of connecting a wireless channel to a wireless speaker to maximize a bandwidth of a wireless channel by comparing bandwidths of available frequency bands, Converting the step and data into an analog signal and outputting it to a speaker.

Here, the wireless speaker further includes a step of processing the digital signal and a step of converting the signal-processed digital signal into an analog signal and outputting the analog signal.

In the case of using the sound transmission system and method according to the present invention as described above, the bandwidth can be maximally secured by comparing the bandwidths in the available frequency band, so that the audio signal can be transmitted in real time.

1 is a block diagram illustrating a configuration of an audio transmission system according to an embodiment of the present invention.
FIG. 2 is a block diagram showing a detailed configuration of a transmitting unit of FIG. 1;
3 is a block diagram showing a software stack of a transmitting terminal.
4 is a block diagram showing a device configuration of a wireless speaker.
5 is a block diagram illustrating a software stack of wireless speakers.
6 is a block diagram showing a configuration of an audio transmission system including a sound collector.
7 is a flowchart illustrating an operation of an audio transmission method according to an embodiment of the present invention.
8 is a flowchart showing a detailed operation of the transmission method of FIG.
9 is a flow chart showing the preprocessing step of the sound transmission method.
10 is a flowchart showing an ending step of the sound transmission method.
11 is a flow chart illustrating the operation of an audio transmission method for delivering sounded audio.

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

1 is a block diagram illustrating a configuration of an audio transmission system according to an embodiment of the present invention.

The sound transmission system includes a transmitting terminal 100 that receives an audio signal and transmits the audio signal to the wireless speaker 200, and a wireless speaker 200 that receives and outputs an audio signal. In summary, how the transmitting terminal 100 processes an audio signal in an audio transmission system is important.

The transmitting terminal 100 includes a comparator 110 for comparing a plurality of audio signals with a threshold value, a selector 120 for selecting an audio signal exceeding a predetermined level, and a selector 120 for selecting only an audio signal And a transmitter 130 for converting the digital signal into a digital signal and transmitting the digital signal to a wireless speaker in accordance with the bandwidth.

The comparator 110 can adjust the threshold value according to the audio environment.

The transmitter 130 requests a wireless channel connectable with the wireless speaker and connects the wireless speaker with the wireless speaker through the connection negotiation. Between the transmitting terminal and the wireless speaker, 2.4 GHz band and 5 GHz band radio channels are available as frequency bands.

The transmitter 130 submits probes and connection requests in the 2.4 GHz band and the 5 GHz band and compares the bandwidths of the response-on bands from the wireless speakers. The transmitter 130 selects a band having a large bandwidth to maximize the bandwidth of the radio channel and cancel the delay. The transmission unit 130 can maximize the bandwidth, thereby increasing the transmission speed and minimizing the delay.

The transmission unit 130 checks the size of the bandwidth and diagnoses the bandwidth usage of the device occupying the bandwidth if the guaranteed transmission rate does not exceed the required bandwidth. The transmission unit 130 may output the specification of the device occupying the bandwidth and request the bandwidth use cancellation. When the device declares an operation interruption, the transmission unit 130 can use the allowable bandwidth. When the bandwidth is secured for the used channel, the transmitter 130 outputs a permission message for the available bandwidth.

The transmission unit 130 compresses the digital sounding audio without compression. The transmission unit 130 eliminates the compression processing time through the non-compression coding to minimize the delay.

The wireless speaker 200 enhances the audio quality by processing a digital signal as a voice signal. The wireless speaker 200 further filters the audio signal from the digital signal and outputs it. It is possible to cancel the delay by performing signal processing in the wireless speaker 200 instead of signal processing in the transmitting terminal 100. [

FIG. 2 is a block diagram showing a detailed configuration of a transmitting unit of FIG. 1;

The transmitting unit 130 includes a determining unit 131 for determining the size of the bandwidth and determining the number of the sound signals to be loaded in the bandwidth, a selecting unit 130 for selecting only a signal of the sound recorder, And a band unit 133 for digitally converting the signal of the sound collector and transmitting the digital signal to the wireless speaker in accordance with the bandwidth.

If the bandwidth is large, the transmitter 133 increases the number of signals of the sound collector, and if the bandwidth is small, the number of signals of the sound collector is reduced.

3 is a block diagram showing a software stack of a transmitting terminal.

The transmitting terminal may be a mobile communication terminal or a computer.

The transmitting terminal may have a device configuration including a processor, a sound module, a Wi-Fi module, and an Ethernet controller. A software stack may be placed above the device configuration of the transmitting terminal. The software stack of the sending terminal is stored in memory and executed by the processor to perform its role. The sending terminal uses the software stack and creates the operating environment and executes the sending application under the operating environment. The transmitting application is an application software of the transmitting terminal, and the receiving terminal performs an operation of receiving the audio signal, digitally converting the audio signal, and transmitting the digital signal to the wireless speaker. The configuration of the transmitting terminal will be described.

The transmitting terminal has a software stack 300 associated with communication, voice coding, and user interfaces. The transmitting terminal includes a TCP / IP API 310, a multicast module 330, a TCP server module 340, and a UDP module 350 as a communication stack. The transmitting terminal includes a PCM API 320, a voice recorder 360).

The TCP / IP API 310 is an API for supporting Internet protocol, the PCM API 320 is an audio encoding API, the multicast module 330 is a broadcast transmission module, and the TCP server module 340 is a TCP server The UDP module 350 is a module supporting the UDP protocol, the voice recorder 360 is a module for recording audio, and the UI 370 is a user interface.

4 is a block diagram showing a device configuration of a wireless speaker.

The wireless speaker may be a Wi-Fi speaker or a Wi-Fi terminal.

The wireless speaker 400 includes a processor 410, a sound module 420, a WiFi module 430, and an Ethernet controller 440.

The WiFi module 430 is a module for supporting wireless LAN communication, and the Ethernet controller 440 is a module for supporting wireless LAN communication. Is a module that supports Ethernet communication.

5 is a block diagram illustrating a software stack of wireless speakers.

The software stack of the wireless speaker installed on the device configuration of the wireless speaker is described.

The software stack 500 of the wireless speaker includes a TCP / IP API 510, a PCM API 520, a multicast module 530, a TCP server module 540, a UDP module 550 and a voice recorder 560 do.

In the software stack, the TCP / IP API 510 is an API for supporting Internet protocols, the PCM API 520 is an audio encoding API, the multicast module 530 is a broadcast transmission module, and the TCP server module 540 ) Is a module for supporting a TCP server, the UDP module 550 is a module for supporting the UDP protocol, and the voice recorder 560 is for recording audio.

6 is a block diagram showing a configuration of an audio transmission system including a sound collector.

The transmitting terminal collects the audio signal through the sound collector and transmits the sound pickup audio to the wireless speaker. When the transmitting terminal transmits the sound pickup audio to the wireless speaker using the sound collector, the configuration of the apparatus is as follows.

The sound pickup can be many. At this time, the transmitting terminal can input signals of a plurality of sound pickup units. The transmitting terminal inputs an audio signal for each source of the sound collector. The transmitting terminal includes a comparator 610 for comparing the sounder signal with a threshold, a selector 620 for selecting a sounder signal, and a transmitter 630 for transmitting the selected sounder signal to the wireless speaker.

7 is a flowchart illustrating an operation of an audio transmission method according to an embodiment of the present invention.

The transmitting terminal selects only an audio signal that can be loaded in a bandwidth among a plurality of audio signals, and transmits the audio signal to the wireless speaker. The configuration that makes this possible is as follows.

(S710) comparing a plurality of audio signals with threshold values, selecting a signal of an audio signal exceeding a predetermined level (S720), and selecting only an audio signal that can be received in the bandwidth of the selected audio signal And transmitting the digital signal to the wireless speaker in accordance with the bandwidth (S730).

8 is a flowchart showing a detailed operation of the transmission method of FIG.

(S810) judging the size of the bandwidth and determining the number of the sound signals to be loaded on the bandwidth (S810), selecting only the signal of the sound recorder capable of being placed on the bandwidth of the selected sound signal of the sound recorder (S820) And transmitting the digital signal to the wireless speaker in accordance with the bandwidth (S830).

The transmitting terminal determines the size of the bandwidth and determines the number of audio signals that can be loaded into the bandwidth.

The transmitting terminal selects only the signal of the sound pickup unit which can be loaded in the bandwidth of the signal of the selected sound pickup sounder.

The transmitting terminal digitally converts the signal of the sound recorder and transmits the digital signal to the wireless speaker in accordance with the bandwidth. If the bandwidth of the transmitting terminal is large, the number of signals of the sound collector is increased, and if the bandwidth is small, the number of signals of the sound collector is reduced.

9 is a flow chart showing the preprocessing step of the sound transmission method.

The preprocessing step forms a radio channel between the transmitting terminal and the wireless speaker.

The wireless speaker executes an initialization routine to initialize the device and initialize the wireless interface (910). The wireless speaker drives the wireless voice receiving software, which is application software (920). The wireless speaker operates as a wireless voice receiving device. The wireless speaker terminates the operation of the application software and waits for the connection of the transmission application (930). The transmitting application is an application program installed in the transmitting terminal.

The transmitting terminal selects a wireless speaker connectable in a wireless channel (940). The sending terminal initiates a sending application (950), which is an application program stored in memory, under the support of a software stack. The transmitting terminal transmits the IP address and the port to the UDP multicast in the channel connection negotiation (960).

The wireless speaker performs channel connection negotiation and initiates UDP listening for voice reception at the port (970). The wireless speaker requests a TCP connection setup for the IP address and port of the sending application (980).

The transmitting terminal adds the IP address of the wireless speaker connected to the TCP to the transmission list (990). The transmitting terminal registers the connectable wireless speaker in the transmission list and sets a target to transmit the voice data.

10 is a flowchart showing an ending step of the sound transmission method.

The termination step performs an operation to process a termination message between the transmitting terminal and the wireless speaker.

The transmitting terminal generates a voice transmission end message upon receiving the transmission end signal from the UI (1010). The transmitting terminal transmits a voice transmission end message to the wireless speaker according to the generation of the end message (1020).

The wireless speaker processes the end message and disconnects the currently connected sending app (1030). The wireless speaker disconnects the sending app and processes the end message received from the sending terminal.

When the connection terminal is disconnected from the wireless speaker, the transmission terminal ends the transmission application (1040). The transmitting terminal terminates the transmitting application and stops inputting and transmitting the voice signal. The transmitting terminal does not transmit the voice signal to the wireless speaker.

The wireless speaker returns to the initial state and waits for the connection of the sending app. The wireless speaker enters an initial state that waits for the connection of the transmitting app. The wireless speaker waits for channel connection of the transmitting app in the initial state.

11 is a flow chart illustrating the operation of an audio transmission method for delivering sounded audio.

The transmitting terminal selects only a signal of a sound pickup unit which can be loaded in a bandwidth of a signal input from a plurality of sound pickup units, and transmits the signal to a wireless speaker. The configuration that makes this possible is as follows.

(S1110), selecting a signal of a sound collector exceeding a predetermined level (S1120), and selecting only a signal of a sound collector capable of being placed on a bandwidth of the signals of the selected sound tracker And transmitting the digital signal to the wireless speaker in accordance with the bandwidth.

The transmitting terminal compares a plurality of sound recorder signals with a threshold value. You can adjust the threshold to suit your audio environment. The transmitting terminal selects the signal of the sound collector exceeding a certain level greater than the threshold value.

The transmitting terminal determines the size of the bandwidth and determines the number of the sound signals to be loaded on the bandwidth (S1130). The transmitting terminal selects only the signal of the sound pickup unit which can be loaded in the bandwidth of the signal of the selected sound pickup unit (S1140). The transmitting terminal digitally converts the signal of the sound collector and transmits the digital signal to the wireless speaker in accordance with the bandwidth (S1150). If the bandwidth of the transmitting terminal is large, the number of signals of the sound collector is increased, and if the bandwidth is small, the number of signals of the sound collector is reduced.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention as defined by the following claims It can be understood that

100: Software stack 110: TCP / IP API
120: PCM API 130: Multicast module
140: TCP server module 150: UDP module
160: Voice recorder

Claims (4)

A transmitting terminal for comparing a bandwidth of an available frequency band to secure a bandwidth of a wireless channel and transmitting data through the wireless channel,
And a wireless speaker for receiving the data through the wireless channel, converting the data into an analog signal, and outputting the analog signal to a speaker,
The transmitting terminal,
A plurality of sound pickups for picking up external audio signals,
A comparator for comparing the plurality of sounders' signals with a threshold value,
A selector for selecting a signal of the sound collector exceeding a predetermined level and
And a transmitter for selecting only a signal of a sound pickup unit capable of operating in the bandwidth of the signal of the selected sound pickup unit, digitally converting the signal, and transmitting the digital signal to the wireless speaker according to the bandwidth,
Wherein the wireless speaker processes the digital signal, converts the digital signal into an analog signal,
Wherein the transmission unit comprises:
If the bandwidth is large, the number of signals of the sound collector is increased. If the bandwidth is small, the number of signals of the sound collector is reduced,
Checking the size of the bandwidth and diagnosing bandwidth usage of the device occupying the bandwidth if the guaranteed transmission rate does not exceed the required bandwidth,
Outputting the specification of the device occupying the bandwidth, requesting the bandwidth use cancellation,
If the device declares an outage, use the allowed bandwidth,
And outputting an allowance message for an available band when bandwidth is secured for the used channel. delete The transmitting terminal may connect the wireless channel,
Comparing a bandwidth of an available frequency band to secure a bandwidth of the wireless channel;
And transmitting data coded over the wireless channel to a wireless speaker,
The transmitting terminal collecting an external audio signal through a plurality of sound pickup units,
Comparing the plurality of sounders' signals with a threshold,
Selecting a signal of the sound collector exceeding a predetermined level,
Selecting only a signal of a sound pickup unit capable of operating in the bandwidth of the selected sound pickup unit,
Digitally converting the signal of the sound pickup unit mounted on the bandwidth;
Further comprising transmitting the digitally converted signal to the wireless speaker in accordance with the bandwidth,
Increasing the number of signals of the sound collector if the transmission terminal has a large bandwidth and reducing the number of signals of the sound collector if the bandwidth is small;
Diagnosing the bandwidth usage of the device occupying the bandwidth if the size of the bandwidth is confirmed and the guaranteed transmission rate does not exceed the required bandwidth;
Outputting a specification of a device occupying the bandwidth and requesting bandwidth use cancellation;
Using the allowed bandwidth if the device declares an outage; And
And outputting an allowance message for an available band if the bandwidth is secured for the used channel. delete
KR1020160023268A 2016-02-26 2016-02-26 System and method for transmitting sound KR101742990B1 (en)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007221574A (en) * 2006-02-17 2007-08-30 Sony Corp Voice processing apparatus, voice processing method, and program

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007221574A (en) * 2006-02-17 2007-08-30 Sony Corp Voice processing apparatus, voice processing method, and program

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