Speaker synchronization technique for wireless multichannel sound data transmission system

• US 8,503,362 B2
• Filed: 05/26/2010
• Issued: 08/06/2013
• Est. Priority Date: 12/10/2009
• Status: Active Grant

• Current Assignee: Korea Electronics Technology Institute (Government of South Korea)
• Original Assignee: Korea Electronics Technology Institute (Government of South Korea)
• Inventors: Wee, Jungwook, Jeon, Wongi, Lee, Younsung, Kim, Hyunsik
• Primary Examiner(s): CHAN, SAI MING
• Application Number:
  US12/787,541
• Publication Number:
  US 20110142243A1
• Time in Patent Office: 1,168 Days
• Field of Search: 370/249, 370/328, 370/503
• US Class Current: 370/328
• CPC Class Codes: H04H 20/47 specially adapted for stereophonic broadcast systems
• CPC Class Codes: H04H 20/61 for local area broadcast, e.g. instore broadcast
• CPC Class Codes: H04H 20/89 using three or more audio channels, e.g. triphonic or quadraphonic

Abstract

The present invention relates to sound data transmission between a wireless sound transmitter that transmits sound data received from a multimedia source, and a wireless sound speaker that outputs sound signal by receiving the sound data, and more particularly, to a method for compensation of a play time delay between the wireless sound speakers occurring when the multichannel sound data is distributed and transmitted from the wireless sound transmitter to the multiple wireless sound speakers. The differences in the play time points occurring between the speakers in a TDMA based multichannel wireless transmission system, are pre-compensated through the delay of the sound data in the WSDT.

Claims

1. A data transmission device in a time-division multiple access (TDMA) based multichannel transmission system, the device comprising:

a bank comprising a plurality of memories which receive and store data in accordance with an input clock signal, and output a plurality of data packets comprising the data sequentially in accordance with an output clock signal; and

a communication unit which transmits the data packets after modulation via respective channels,

wherein if a time duration required for transmitting one data packet through a channel among the respective channels is T, a play time of a data packet in an M-th memory among the memories is (M−

1)T.

2. A time-division multiple access (TDMA) based multichannel transmission system comprising:

a transmitter which receives data in accordance with an input clock signal, stores the data into a plurality of memories, outputs a plurality of data packets comprising the data sequentially, and transmits the data packets after modulation via respective channels; and

a plurality of receivers which receive and play the data packets, respectively, from the transmitter,

wherein if a time duration required for transmitting one data packet through a channel among the respective channels is T, a play time of a data packet in an M-th memory among the memories is (M−

1)T.

3. A data transmission method in a time-division multiple access (TDMA) based multichannel wireless transmission system, the method comprising:

conveying data to respective delay units;

outputting a plurality of data packets comprising the data from the delay units with respective time delays from previously output data packets as assigned to a plurality of channels for transmitting the data packets; and

transmitting the data packets according to an order of a predetermined sequence via the channels,

wherein if a number of the channels is M and a time duration required for transmitting a data packet through a channel among the channels is T, a length of data packet delay at a delay unit among the delay units corresponding to a k-th channel among the channels is (M−

k)T.

4. The method of claim 3, wherein the data packet delay is performed only at a time point prior to the transmission of a firstly transmitted data packet in a corresponding channel among the wireless channels.

5. A data transmission method in a time-division multiple access (TDMA) based multichannel transmission system, the method comprising:

conveying data to respective delay units;

outputting a plurality of data packets comprising the data from the delay units with respective time delays from previously output data packets as assigned to a plurality of wireless channels for transmitting the data packets; and

transmitting the data packets according to an order of a predetermined sequence via the wireless channels,

wherein a time duration required for transmitting the data packets is less than or equal to a play time duration of all the data packets.

6. A data transmission device in a time-division multiple access (TDMA) based multichannel transmission system, the device comprising:

a delay unit which outputs a data packet input to the delay unit with a predetermined time delay as assigned to a channel for transmitting the data packet; and

a communication unit which transmits the data packet delayed by the delay unit after modulation via the channel according to a predetermined transmission order,

wherein if a number of channels including the channel is M and a time duration required for transmitting the data packet through the channel is T, a length of data packet delay at the delay unit corresponding to a k-th channel among the channels is (M−

k)T.

7. A time-division multiple access (TDMA) based multichannel transmission system comprising:

a transmitter which receives data, outputs each of a plurality of data packets comprising the data with a predetermined time delay as assigned to each of a plurality of channels, and transmits the packets to respective receivers after modulation via the channels,

wherein at least one of the receivers for playing a data packet among the data packets received from the transmitter,

wherein the transmitter comprises;

a plurality of delay units which output the data packets input to the delay units with respective time delays as assigned to the channels, respectively;

a modem which modulates the data packets output from the delay units; and

a communication unit which transmits the data packets via the channels, respectively, and

wherein if a number of the channels is M and a time duration required for transmitting a data packet among the data packets through a channel among the channels is T, a length of data packet delay at a delay unit among the delay units corresponding to a k-th channel among the channels is (M−

k)T.