CN209748571U - Indoor distributed broadcasting device - Google Patents

Abstract

the utility model relates to an indoor distributed broadcasting device, including a host computer unit and at least one from the computer unit, the host computer unit includes wireless transmission module and audio processing module, include wireless receiving module, filtering module and play module from the computer unit, the host computer unit passes through wireless transmission module to the digital audio code stream after the computer unit output is handled through audio processing module, from the computer unit pass through the digital audio code stream that wireless receiving module will receive and flow through behind the filtering process conveying to play module, the utility model provides an indoor distributed broadcasting device uses the full digital mode to realize indoor wireless audio broadcasting system, and digital audio frequency lossless transmission, processing, enlargies, has high-fidelity characteristic, and the host computer, adopt radio frequency wireless connection between the machine, simple, the job stabilization of system installation.

Description

Indoor distributed broadcasting device

Technical Field

The utility model belongs to the technical field of remove multimedia broadcasting, concretely relates to indoor distributed broadcasting device.

Background

The distributed system is to utilize a plurality of computers to cooperatively solve the problems of calculation, storage and the like which cannot be solved by a single computer, the biggest difference between a single-computer system and the distributed system is the scale of the problems, namely the difference of the data amount of calculation and storage, and one single-computer problem is solved in a distributed mode, so that each machine in the distributed system is responsible for a subset of the original problem.

The digital multimedia broadcasting system is a new concept multimedia mobile broadcasting service combining communication and broadcasting, is called 3 rd generation radio broadcasting, and can transmit various multimedia information such as traffic information and news to mobile phones in various modes such as MPEG-4H.264, MPEG-2, AAC + and the like besides supporting traditional audio broadcasting, thereby providing high-quality tone quality and diversified data services. Moreover, the cdm (code division multiplexing) technology consistent with the mobile phone is adopted, so that the mobile terminal is particularly suitable for a mobile receiving environment, can better deal with the problem of multipath interference caused by signal quality reduction in the mobile receiving environment, can meet the requirements of people on receiving television programs such as news, information, entertainment and the like on small-screen, small-size and portable handheld terminals such as mobile phones, digital cameras, notebook computers and vehicle-mounted and ship-mounted portable mobile terminal equipment at any time and any place within a signal coverage range, and is important supplement and extension of a broadcast television transmission channel.

At present, most indoor video transmission adopts a wireless transmission mode, and the wireless transmission scheme has the advantages that audio cables are not required to be laid on a wall body, no cable trip exists between receiving and sending equipment, the mounting position is flexible, the construction is simple, the use is convenient, and the wireless transmission mode comprises three modes of infrared light, radio and digital, wherein the infrared light cannot penetrate through the wall, the radio distance is long, the cost is low, but the requirement of high fidelity is not met, and the confidentiality is poor; bluetooth is limited by the speed, audio is subjected to lossy compression to degrade the signal-to-noise ratio, multipoint broadcast connection is not supported, the transmission distance is short, WiFi is based on a local area network standard, the speed reaches hundreds of Mb/s, the delay time is short, and the method is an ideal choice for transmitting high-fidelity digital audio.

disclosure of Invention

The present invention is directed to solve the problems of the prior art, and to provide an indoor distributed broadcasting device using high fidelity wireless digital audio transmission.

The purpose of the utility model is realized like this:

The indoor distributed broadcasting device comprises a host unit and at least one slave unit, wherein the host unit comprises a wireless transmitting module and an audio processing module, the slave unit comprises a wireless receiving module, a filtering module and a playing module, the host unit outputs a digital audio code stream processed by the audio processing module to the slave unit through the wireless transmitting module, and the slave unit transmits the received digital audio code stream to the playing module after filtering processing through the wireless receiving module.

Furthermore, the audio processing module comprises a storage module, an analog input module, a digital optical fiber module, a digital coaxial module, a USB module and an FM audio module.

Further, the storage module adopts a TF memory card.

Furthermore, the FM audio module adopts an FM radio.

Further, the digital audio code stream is from any one of a storage module, an audio module, an analog input module, a digital optical fiber module, a digital coaxial module or a USB module in the host unit.

Furthermore, the slave unit further comprises a reverberation time calculation module and a coefficient calculation module, wherein the reverberation time calculation module calculates reverberation time of each frequency band according to the received playing signal, and the coefficient calculation module calculates a filter bank coefficient according to the reverberation time and establishes a filter according to the filter bank coefficient.

Furthermore, the playing module adopts a class D audio power amplifier.

Furthermore, the master unit and the slave unit are connected by a digital audio interface.

Further, the slave unit is at least one of a PC, a mobile phone, a tablet PC, or a sound box.

Further, the host computer also comprises an ARM processor and an LCD display screen.

Furthermore, the host unit also comprises a power supply module, the power supply module adopts a 5V-20V power supply, and the host unit supplies power through a USB port.

Furthermore, the host unit further comprises a monitoring module and a daily information module.

Furthermore, an alarm module is arranged in the monitoring module.

Further, the daily information module comprises date, time, lunar calendar and solar terms information.

Compared with the prior art, the beneficial effects of the utility model reside in that:

1. The utility model provides a pair of indoor distributed broadcasting device, host computer have analog/digital audio frequency receiver, selector and transmitter function concurrently, and the sound source comes from audio processing module, receives digital audio frequency code stream from the machine, directly sends into the D class audio power amplifier who has digital input interface, needn't carry out digit-analog conversion, does not introduce the circuit noise, and D class amplifier is efficient, need not the radiator, arranges the low-power consumption state in when the system standby, further reduces the consumption.

2. The utility model provides a pair of indoor distributed broadcasting device uses the full digital mode to realize indoor wireless audio broadcasting system, and digital audio has the high-fidelity characteristic with CD tone quality lossless transmission, processing, enlargies, and the host computer, from adopting radio frequency wireless connection between the machine, system installation is simple, job stabilization.

3. The utility model provides a pair of indoor distributed broadcasting device, the filter coefficient is calculated for the reverberation time of each frequency channel in the room according to the reverberation time of each frequency channel and obtains, establishes the wave filter according to the reverberation time of each sound wave frequency channel, adopts the wave filter to filter the audio frequency, and then the sound definition of this audio frequency when the broadcast is higher, and the effect is better.

Drawings

Fig. 1 is a schematic diagram of an indoor distributed broadcasting device according to the present invention.

Fig. 2 is a flowchart of the work flow of the indoor distributed broadcasting device of the present invention.

Fig. 3 is a structural diagram of a host unit and a slave unit of an indoor distributed broadcasting device according to the present invention.

In the figure: 1. a host unit; 11. a wireless transmitting module; 12. an audio processing module; 121. A storage module; 122. an input module; 123. a digital fiber optic module; 124. a digital coaxial module; 125. a USB module; 126. an FM audio module; 2. a slave unit; 21. a wireless receiving module; 22. a wave module; 23. a playing module; 24. a coefficient calculation module; 25. and a reverberation time calculation module.

Detailed Description

The technical solution in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are only some embodiments of the present invention, but not all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative work belong to the scope of the present invention.

Example 1

With reference to fig. 1, an indoor distributed broadcasting device includes a host unit 1 and at least one slave unit 2, with reference to fig. 2, the host unit 1 includes a wireless transmitting module 11 and an audio processing module 12, the slave unit 2 includes a wireless receiving module 21, a filtering module 22 and a playing module 23, the host unit 1 outputs a digital audio code stream processed by the audio processing module 12 to the slave unit 2 through the wireless transmitting module 11, the slave unit 2 transmits the received digital audio code stream to the playing module 23 after filtering processing through the wireless receiving module 21, the playing module 23 employs a D-class audio power amplifier, and the host unit 1 and the slave unit 2 employ a digital audio interface for connection.

The host unit 1 has the functions of an analog/digital audio receiver, a selector and a transmitter, a sound source is from the audio processing module 12, the slave unit 1 receives a digital audio code stream and directly sends the digital audio code stream to the D-class audio power amplifier of the playing module 23 with a digital input interface, digital-analog conversion is not needed, circuit noise is not introduced, the efficiency of the D-class amplifier is high, a radiator is not needed, the system is placed in a low power consumption state when in standby, the power consumption is further reduced, the host is supplied with power through a USB port and can be flexibly placed near a computer or a mains supply socket, and the slave unit can be installed by adopting a wall-mounted sound box, a floor sound box or a ceiling sound box.

Example 2

With reference to fig. 2 and 3, the host unit 1 includes a wireless transmitting module 11 and an audio processing module 12, the audio processing module 12 includes a storage module 121, an analog input module 122, a digital fiber module 123, a digital coaxial module 124, a USB module 125, and an FM audio module 126, the storage module 121 employs a TF memory card, the FM audio module 126 employs an FM radio, the digital audio code stream is from any one of the storage module 121, the audio module, the analog input module 122, the digital fiber module 123, the digital coaxial module 124, or the USB module 125 in the host unit 1, the slave unit 2 includes a wireless receiving module 21, a filtering module 22, and a playing module 23, the host unit 1 outputs the digital audio code stream processed by the audio processing module 12 to the slave unit 2 through the wireless transmitting module 11, and the slave unit 2 transmits the received digital audio code stream to the playing module 23 through the wireless receiving module 21 after being filtered In block 23, the slave unit 2 further includes a reverberation time calculation module 25 and a coefficient calculation module 24, the reverberation time calculation module 25 calculates reverberation time of each frequency band according to the received playing signal, and the coefficient calculation module 24 calculates a filter bank coefficient according to the reverberation time and establishes a filter according to the filter bank coefficient.

The filter coefficients are calculated and obtained by the reverberation time calculation module 25 and the coefficient calculation module 24 according to the reverberation time of each frequency band in the room, a filter is established according to the reverberation time of each sound wave frequency band, and the audio is filtered by the filter, so that the audio has higher sound definition during playing.

Above only be the preferred embodiment of the present invention, not be used for limiting the utility model discloses, the all be in the utility model discloses an any modification of doing in the protection scope, equal replacement etc. all should be contained within the protection scope of the utility model.

Claims (9)

1. An indoor distributed broadcasting apparatus, characterized in that: the device comprises a host unit (1) and at least one slave unit (2), wherein the host unit (1) comprises a wireless transmitting module (11) and an audio processing module (12), the slave unit (2) comprises a wireless receiving module (21), a filtering module (22) and a playing module (23), the host unit (1) outputs a digital audio code stream processed by the audio processing module (12) to the slave unit (2) through the wireless transmitting module (11), and the slave unit (2) transmits the received digital audio code stream to the playing module (23) after filtering processing through the wireless receiving module (21).

2. An indoor distributed broadcasting apparatus as claimed in claim 1, wherein: the audio processing module (12) comprises a storage module (121), an analog input module (122), a digital optical fiber module (123), a digital coaxial module (124), a USB module (125) and an FM audio module (126).

3. An indoor distributed broadcasting apparatus as claimed in claim 2, wherein: the storage module (121) adopts a TF memory card.

4. An indoor distributed broadcasting apparatus as claimed in claim 2, wherein: the FM audio module (126) adopts an FM radio.

5. An indoor distributed broadcasting apparatus as claimed in claim 2, wherein: the digital audio code stream is from any one of a storage module (121), an audio module, an analog input module (122), a digital optical fiber module (123), a digital coaxial module (124) or a USB module (125) in the host unit (1).

6. An indoor distributed broadcasting apparatus as claimed in claim 1, wherein: the slave unit (2) further comprises a reverberation time calculation module (25) and a coefficient calculation module (24), wherein the reverberation time calculation module (25) calculates reverberation time of each frequency band according to received playing signals, the coefficient calculation module (24) calculates filter bank coefficients according to the reverberation time, and a filter is established according to the filter bank coefficients.

7. An indoor distributed broadcasting apparatus as claimed in claim 1, wherein: the playing module (23) adopts a D-type audio power amplifier.

8. An indoor distributed broadcasting apparatus as claimed in claim 1, wherein: the master unit (1) and the slave unit (2) are connected by a digital audio interface.

9. An indoor distributed broadcasting apparatus as claimed in claim 1, wherein: the slave unit (2) is at least one of a PC, a mobile phone, a tablet personal computer or a loudspeaker box.