Wireless microphone system

Patent metadata

Field	Value
Publication number	US-10470180-B2
Application number	US-201815879077-A
Country	US
Kind code	B2
Filing date	Jan 24, 2018
Priority date	Jan 24, 2018
Publication date	Nov 5, 2019
Grant date	Nov 5, 2019

Abstract

A wireless microphone system efficiently combines a pair of antennas so that radio frequency (RF) signals may be transmitted to and from multiple receivers and multiple wireless microphones. The wireless microphone system supports a general radio access technology and may comply with a Digital Enhanced Cordless Telecommunications (DECT) specification. The resource manager combines a received RF component with a first digital component via a first coaxial link to a connected receiver. The receiver also combines a transmitted RF component with a second digital component via a second coaxial link to the resource manager. The first digital component further includes synchronization and data sub-components, which are separated at the receiver.

First claim

What is claimed is:

1. A communication system supporting a plurality of wireless microphones over a common wireless spectrum, the system comprising:
a resource manager receiving a received radio frequency (RF) component from a first wireless microphone, the plurality of wireless microphones comprising the first wireless microphone;
a receiver, wherein a first coaxial link electrically connects the receiver to the resource manager, the receiver supporting a first wireless microphone utilizing allocated resources on the received RF component;
the resource manager comprising a first coaxial combiner, the first coaxial combiner combining the received RF component and a first digital component into a first combined signal, the first digital component further comprising a first data sub-component and a synchronization sub-component for transmission over the first coaxial link; and
the receiver comprising a first coaxial separator, the first coaxial separator separating the received RF component, the first data sub-component, and the synchronization sub-component obtained over the first coaxial link.

2. The communication system of claim 1 , wherein:
the receiver further comprises a second coaxial combiner, the second coaxial combiner combining a transmitted radio frequency (RF) component with a second digital component into a second combined signal, the second digital component comprising a second data sub-component; and
the resource manager further comprises a second coaxial separator, the second coaxial separator separating the transmitted RF component from the second data sub-component conveyed in the second combined signal; and
the resource manager transmits the transmitted RF component to the first wireless microphone.

3. The communication system of claim 2 , wherein:
the resource manager is electrically connected to the receiver through a second coaxial link; and
the receiver sends the second combined signal over the second coaxial link to the resource manager.

4. The communication system of claim 2 , wherein:
the resource manager further comprises a first duplex selector;
the receiver further comprises a second duplex selector; and
the first duplex selector and the second duplex selector cooperatively activate the first coaxial link in either a forward or reverse direction, wherein the first and second combined signals are transported over the first coaxial link.

5. The communication system of claim 1 , wherein the received RF component is based on time division multiple access (TDMA), and wherein the resource manager allocates a first number of timeslots to the first wireless microphone.

6. The communication system of claim 5 , wherein the resource manager subsequently allocates allocated timeslots having a second number of timeslots to the first wireless microphone and wherein the first number is different from the second number.

7. The communication system of claim 6 , wherein:
the receiver comprises a configuration switch; and
the resource manager determines whether to allocate the second number of timeslots from a setting of the configuration switch.

8. The communication system of claim 6 , wherein:
the receiver comprises a spectrum analyzer;
the spectrum analyzer determines an averaged power value of at least one frequency band for the first wireless microphone over a predetermined time duration; and
when the averaged power value is greater than a predetermined threshold, the resource manager allocates the second number of timeslots to the first wireless microphone.

9. The communication system of claim 8 , wherein:
based on the averaged power value, the spectrum analyzer determines whether received content conveyed on the allocated timeslots comprises music content.

10. The communication system of claim 5 , wherein the resource manager allocates a third number of timeslots to a second wireless microphone and wherein the third number is different from the first number of timeslots allocated to the first wireless microphone.

11. The communication system of claim 1 , further comprising:
a plurality of synchronization sources comprising a first synchronization source and a second synchronization source; and
wherein the resource manager selects a first synchronization source from the plurality of synchronization sources.

12. The communication system of claim 11 , wherein:
the resource manager selects one of the plurality of synchronization sources based on an amount of jitter of the synchronization sub-component.

13. The communication system of claim 1 , wherein the first coaxial separator of the receiver obtains the synchronization sub-component by:
detecting a beginning portion of a synchronization signal;
measuring a high level quality of the synchronization signal;
measuring a low level quality of the synchronization signal;
waiting until a next synchronization time frame;
repeating the detecting, the measuring the high level quality, the measuring the low level quality, and the waiting; and
when the repeating is successful a first predetermined of number of iterations, identifying a time alignment of the first data sub-component.

14. The communication system of claim 13 , wherein the first coaxial separator obtains the synchronization sub-component by:
filtering the synchronization signal to reduce overshoot characteristics of the synchronization signal.

15. The communication system of claim 13 , wherein the first coaxial separator obtains the synchronization sub-component by:
when the synchronization sub-component is not successfully detected for a second predetermined of iterations, reinitiating the detecting, the measuring the high level quality, the measuring the low level quality, and the waiting.

16. The communication system of claim 13 , wherein the beginning portion of the synchronization signal comprises an edge of the synchronization signal.

17. The communication system of claim 1 , wherein the first coaxial separator of the receiver separates the synchronization sub-component from the first data sub-component by detecting a first signal level range and a second signal level range and wherein the synchronization sub-component is characterized by the first signal level range and the first data sub-component is characterized by the second signal level range.

18. A method for supporting a plurality of wireless microphones over a common wireless spectrum utilizing time division multiple access (TDMA), the method comprising:
receiving, by a resource manager, a received radio frequency (RF) component from a first wireless microphone, wherein the first wireless microphone is assigned a first number of allocated timeslots and the plurality of wireless microphones includes the first wireless microphone;
combining, by the resource manager, the received RF component and a digital component to form a first combined signal, wherein the digital component includes a synchronization sub-component and a data sub-component;
sending, by the resource manager to a first receiver over a first coaxial link, the first combined signal;
separating, by the first receiver, the received RF component, the synchronization sub-component, and the data sub-component from the first combined signal; and
processing, by the first receiver, the allocated timeslots for the first wireless microphone to obtain an audio signal generated by the first wireless microphone.

19. The method of claim 18 , further comprising:
combining, by the first receiver, a transmitted radio frequency (RF) component with a digital

Assignees

• Shure Acquisition Holdings Inc

Inventors

• Mansouri Mack
• Boyce Myzil Elroy

Classifications

• H04J3/0652

  Synchronisation among time division multiple access [TDMA] nodes, e.g. time triggered protocol [TTP] (bus network with centralized control in which slots are of a TDMA packet structure H04L12/4035) · CPC title

• H04R3/005

  for combining the signals of two or more microphones (specially adapted for hearing aids H04R25/407) · CPC title

• H04W72/0446 Primary

  Resources in time domain, e.g. slots or frames · CPC title

• H04R2420/07

  Applications of wireless loudspeakers or wireless microphones · CPC title

• H04L5/1469

  using time-sharing · CPC title