SPEECH SIGNAL TRANSMISSION AND RECEPTION APPARATUSES AND SPEECH SIGNAL TRANSMISSION AND RECEPTION METHODS

• US 20130138431A1
• Filed: 11/26/2012
• Published: 05/30/2013
• Est. Priority Date: 11/28/2011
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kwon, Young Do, Roh, Kyung Shik, CHOI, Byung Kwon, Kim, Dong Soo
• Granted Patent: US 9,058,804 B2
• Time in Patent Office: Days
• US Class Current: 704/201
• CPC Class Codes: G10L 19/008 Multichannel audio signal coding or decoding using interchannel correlation to reduce redundancy, e.g. joint-stereo, intensity-coding or matrixing
• CPC Class Codes: G10L 25/21 the extracted parameters being power information

Abstract

A speech signal transmission apparatus includes an extractor to extract speech signals from speech source signals collected by a plurality of microphones, a power calculator to calculate powers of speech signals of multiple channels and set any one of the speech signals of the multiple channels as a reference speech signal, a synchronization adjustor to adjust synchronization of the other speech signals based on the reference speech signal, a signal generator to generate extraction signals by offsetting the reference speech signal from the other synchronization-adjusted speech signals, an encryptor to compress and encrypt the reference speech signal and the extraction signals, and a transmitter to transmit the compressed and encrypted reference speech signal and extraction signals.

Claims

1. A speech signal transmission apparatus comprising:

an extractor to extract a plurality of speech signals from a plurality of speech source signals collected by a plurality of microphones;

a power calculator to calculate a plurality of power parameters of the plurality of speech signals and set any one speech signal among the plurality of speech signals of the multiple channels as a reference speech signal;

a synchronization adjustor to calculate a plurality of synchronization parameters of the speech signals among the plurality of speech signals excluding the reference speech signal and to adjust synchronization of the speech signals among the plurality of speech signals excluding the reference speech signal based on the reference speech signal;

a signal generator to generate a plurality of extraction signals by offsetting the reference speech signal from each synchronization-adjusted speech signal;

an encryptor to compress and encrypt the reference speech signal and the plurality of extraction signals; and

a transmitter to transmit the compressed and encrypted reference speech signal and the compressed and encrypted plurality of extraction signals.

2. The speech signal transmission apparatus according to claim 1, wherein the power calculator sets a speech signal having the greatest power among the plurality of speech signals of the multiple channels as the reference speech signal.

3. The speech signal transmission apparatus according to claim 1, wherein the power calculator calculates power parameters corresponding to each speech signal among the plurality of speech signals excluding the reference speech signal based on a ratio of a power of each speech signal to a power of the reference speech signal.

4. The speech signal transmission apparatus according to claim 3, wherein the signal generator generates offset signals corresponding to each speech signal among the plurality of speech signals excluding the reference speech signal by applying each power parameter corresponding to each speech signal to the reference speech signal and generates extraction signals by subtracting each offset signal from each speech signal.

5. The speech signal transmission apparatus according to claim 1, wherein the signal generator generates the plurality of extraction signals by subtracting a power of the reference voice signal from a power of each speech signal among the plurality of speech signals excluding the reference speech signal.

6. The speech signal transmission apparatus according to claim 1, wherein the encryptor encrypts information of a microphone among the plurality of microphones by which the reference speech signal is collected, the plurality of extraction signals, information of the microphones among the plurality of microphones excluding the microphone among the plurality of microphones by which the reference speech signal is collected, the plurality of power parameters, and the plurality of synchronization parameters.

7. The speech signal transmission apparatus according to claim 1, wherein the synchronization adjustor calculates the plurality of synchronization parameters based on distances between a microphone by which the reference speech signal is collected and the plurality of microphones excluding the microphone by which the reference speech signal is collected and adjusts synchronization of each speech signal among the plurality of speech signals excluding the reference speech signal based on the plurality of synchronization parameters.

8. The speech signal transmission apparatus according to claim 1, wherein the synchronization adjustor adjusts synchronization of the speech signals among the plurality of speech signals excluding the reference speech signal using correlation between the plurality of microphones.

9. A speech signal reception apparatus comprising:

a receiver to receive signals of multiple channels;

a decoder to decode the received signals of the multiple channels into a reference speech signal and at least one extraction signal;

a power restorer to restore a power of the at least one decoded extraction signal to obtain a speech signal;

a synchronization restorer to restore synchronization of the at least one power-restored speech signal;

a multiplexer to multiplex the reference speech signal and the at least one power-restored and synchronization-restored speech signal; and

an output part to output the multiplexed speech signal.

10. The speech signal reception apparatus according to claim 9, wherein the receiver transmits the received signals to the decoder and transmits information of the at least one extraction signal to the power restorer and the synchronization restorer.

11. The speech signal reception apparatus according to claim 10, wherein the decoder distinguishes between the reference speech signal and the at least one extraction signal by parsing headers of the received signals of the multiple channels.

12. The speech signal reception apparatus according to claim 10, wherein the information of the at least one extraction signal comprises information of a microphone by which the reference speech signal is collected, information of a microphone by which a speech signal to be decoded is collected, a power parameter, and a synchronization parameter.

13. The speech signal reception apparatus according to claim 12, wherein the power restorer restores a power of the at least one extraction signal using the power parameter to generate at least one speech signal.

14. The speech signal reception apparatus according to claim 13, wherein the synchronization restorer restores synchronization of the power-restored speech signal using the synchronization parameter.

15. A speech signal transmission method comprising:

collecting a plurality of speech source signals by a plurality of microphones;

extracting a plurality of speech signals from the collected plurality of speech source signals;

calculating powers of the plurality of speech signals;

setting any one of the plurality of speech signals as a reference speech signal;

adjusting synchronization of the speech signals among the plurality of speech signals excluding the reference speech signal based on the reference speech signal;

generating a plurality of extraction signals by offsetting the reference speech signal from the synchronization-adjusted speech signals;

compressing and encrypting the reference speech signal and the plurality of extraction signals; and

transmitting the compressed and encrypted reference speech signal and the compressed and encrypted plurality of extraction signals.

16. The speech signal transmission method according to claim 15, wherein the setting of any one of the speech signals comprises setting a speech signal among the plurality of speech signals having the greatest power as the reference speech signal.

17. The speech signal transmission method according to claim 15, wherein the generating the plurality of extraction signals comprises:

calculating a plurality of power parameters corresponding to the speech signals among the plurality of speech signals excluding the reference speech signal based on ratios of powers of the speech signals to a power of the reference speech signal;

generating a plurality of offset signals corresponding to the speech signals by applying the plurality of power parameters to the reference speech signal; and

generating a plurality of extraction signals by subtracting each offset signal from each speech signal.

18. The speech signal transmission method according to claim 15, wherein the compressing and encrypting of the reference speech signal and the extraction signals comprises encrypting information of a microphone among the plurality of microphones by which the reference speech signal is collected, the plurality of extraction signals, information of the microphones among the plurality of microphones excluding the microphone among the plurality of microphones by which the reference speech signal is collected, the plurality of power parameters, and the plurality of synchronization parameters.

19. The speech signal transmission method according to claim 15, wherein the adjusting synchronization of the speech signals comprises:

calculating a plurality of synchronization parameters based on distances between a microphone by which the reference speech signal is collected and the plurality of microphones excluding the microphone by which the reference signal is collected; and

adjusting synchronization of each speech signal among the plurality of speech signals excluding the reference speech signal based on the plurality of synchronization parameters.

20. A speech signal reception method comprising:

receiving signals of multiple channels;

generating a reference speech signal, at least one extraction signal, and information of the at least one extraction signal by decoding the received signals of the multiple channels; and

restoring a power of the at least one extraction signal and synchronization of the at least extraction signal based on the information of the at least one extraction signal.

21. The speech signal reception method according to claim 20, further comprising:

multiplexing the reference speech signal and the at least one power-restored and synchronization-restored speech signal; and

generating the multiplexed speech signal.

22. The speech signal reception method according to claim 20, wherein the information of the at least one extraction signal comprises information of a microphone by which the reference speech signal is collected, information of a remaining microphone by which a speech signal to be decoded is collected, a power parameter, and a synchronization parameter.

23. The speech signal reception method according to claim 22, wherein the restoring of a power comprises restoring a power of the at least one extraction signal using the power parameter to generate at least one speech signal.

24. The speech signal reception method according to claim 23, wherein the restoring of synchronization comprises restoring synchronization of the power-restored speech signal using the synchronization parameter.

25. The speech signal reception method according to claim 23, wherein the power parameter is a ratio of a power of the at least one power-restored and synchronization-restored speech signal to a power of the reference speech signal.

26. A speech signal transmission method comprising:

setting a reference speech signal as any one speech signal among a plurality of speech signals;

adjusting synchronization of the speech signals among the plurality of speech signals excluding the reference speech signal based on the reference speech signal;

generating a plurality of extraction signals by offsetting the reference speech signal from the synchronization-adjusted speech signals;

transmitting the reference speech signal and the plurality of extraction signals.

27. The speech signal transmission method according to claim 26 further comprising:

calculating powers of the plurality of speech signals,

wherein the setting the reference speech signal comprises setting a speech signal having the greatest power among the plurality of speech signals as the reference speech signal.