Wireless communication device and communication terminal

Patent metadata

Field	Value
Publication number	US-9270419-B2
Application number	US-201514668198-A
Country	US
Kind code	B2
Filing date	Mar 25, 2015
Priority date	Sep 28, 2012
Publication date	Feb 23, 2016
Grant date	Feb 23, 2016

Abstract

A device divides a sampled sound signal into a high frequency signal and a low frequency signal, individually encodes the high frequency signal and the low frequency signal, and generates error detection code pertinent to the high frequency ADPCM data and the low frequency ADPCM data. The device replaces data pertinent to some of a plurality of bits which configure the low frequency ADPCM data with the error detection code and transmits them. A receiver side receives the high frequency ADPCM data and the low frequency ADPCM data, and individually processes the high frequency ADPCM data and the low frequency ADPCM data in accordance with a value of the error detection code.

First claim

What is claimed is:

1. A wireless communication device that establishes a digital link on a wireless channel and that performs a communication by a sound packet including a sound signal, which is encoded by means of adaptive differential pulse code modulation (ADPCM), and an error detection code, the wireless communication device comprising:
an ADPCM encoding unit that divides a sampled sound signal into a high frequency signal and a low frequency signal and individually encodes the high frequency signal and the low frequency signal by means of adaptive differential pulse code modulation to thereby convert the high frequency signal into high frequency ADPCM data having a first number of bits, and convert the low frequency signal into low frequency ADPCM data having a second number of bits;
an error detection code generation unit that generates an error detection code that is pertinent to the high frequency ADPCM data and the low frequency ADPCM data;
a transmission data conversion unit that places the error detection code that is pertinent to the high frequency ADPCM data and the low frequency ADPCM data in only data pertinent to the low frequency ADPCM data; and
a received data processing unit that receives the high frequency ADPCM data and the low frequency ADPCM data including the error detection code that is pertinent to the high frequency ADPCM data and the low frequency ADPCM data, and that individually processes the high frequency ADPCM data and the low frequency ADPCM data in accordance with a value of the error detection code that is pertinent to the high frequency ADPCM data and the low frequency ADPCM data.

2. The wireless communication device according to claim 1 , wherein
a first number of bits of the high frequency ADPCM data and a second number of bits of the low frequency ADPCM data are fixed, and
the transmission data conversion unit replaces bits with the error detection code generated by the error detection code generating unit, wherein the replaced bits are selected, except a plurality of bits to be input to an adaptive dequantizer of the ADPCM encoding unit, in data pertinent to the second number of bits which configure the low frequency ADPCM data.

3. The wireless communication device according to claim 1 , wherein
the error detection code generation unit generates a first error detection code pertaining to the high frequent ADPCM data and a second error detection code pertaining to the low frequency ADPCM data, and
the transmission data conversion unit replaces at least two bits of data among the plurality of bits that configure the low frequency ADPCM data with at least two bits of an error detection code including the first error detection code and the second error detection code.

4. The wireless communication device according to claim 3 , wherein
the transmission data conversion unit replaces data pertinent to two lower order bits of the low frequency ADPCM with at least two bits of an error detection code including the first error detection code and the second error detection code.

5. The wireless communication device according to claim 1 , wherein
the error detection code generation unit generates a first error detection code that acts as a parity signal for reversing bits in accordance with the number of “1s” in the high frequency ADPCM data and a second error detection code that acts as a parity signal for reversing bits in accordance with the number of “1s” in the low frequency ADPCM data.

6. The wireless communication device according to claim 1 , wherein
the error detection code generation unit generates a third error detection code that acts as a parity signal for reversing bits in accordance with the number of “1s” in a series of data that include the high frequency ADPCM data and the low frequency ADPCM data.

7. The wireless communication device according to claim 1 , further comprising
an ADPCM encoding unit that converts the received high frequency ADPCM data into high frequency digital sound data and the received low frequency ADPCM data into low frequency digital sound data.

8. The wireless communication device according to claim 1 , wherein
when an error is detected by means of the received error detection code, the received data processing unit performs first signal processing on the high frequency ADPCM data that are received along with the error detection code and performs second signal processing on the low frequency ADPCM data that are received along with the error detection code.

9. The wireless communication device according to claim 3 , wherein
the received data processing unit extracts the high frequency ADPCM data and a first error detection code from a received signal, and extracts the low frequency ADPCM data and a second error detection code from the received signal, and
the received data processing unit detects an error occurred in the high frequency ADPCM data based on the first error detection code, and detects an error occurred in the low frequency ADPCM data based on the second error detection code.

10. The wireless communication device according to claim 3 , wherein
the received data processing unit performs third signal processing on the high frequency ADPCM data received along with the error detection code and fourth signal processing on the low frequency ADPCM data received along with the error detection code when an error in a high frequency signal is detected by means of the received first error detection code, and
the received data processing unit performs fifth signal processing on the high frequency ADPCM data received along with the error detection code and sixth signal processing on the low frequency ADPCM data received along with the error detection code when an error in a low frequency signal is detected by means of the received second error detection code.

11. The wireless communication device according to claim 10 , wherein
the received data processing unit converts the high frequency ADPCM data into mute data when an error in the high frequency ADPCM data is detected based on a value of the first error detection code.

12. The wireless communication device according to claim 10 , wherein
the received data processing unit converts both the high frequency ADPCM data and the low frequency ADPCM data sent along with the high frequency ADPCM data into mute data when an error in the high frequency ADPCM data is detected based on a value of the first error detection code.

13. The wireless communication device according to claim 10 , wherein
the received data processing unit converts the low frequency ADPCM data into mute data when an error in the low frequency ADPCM data is detected based on a value of the second error detection code.

14. The wireless communication device according to claim 10 , wherein
the received data processing unit converts both the low frequency ADPCM data and the high frequency ADPCM data sent along with the low frequency ADPCM data into mute data when an error in the low frequency ADPCM data is detected based on a value of the second error detection code.

15. The wireless communication device according to claim 1 , further comprising
an error determination unit that determines a change in error rate of the digital link, wherein
the transmission conversion unit selects, based on a determination result of the error determination unit, whether to transmit the low frequency ADPCM data to a communication opponent after replacing some of the low frequency ADPCM data with an error detection code or to transmit the low frequency ADPCM data without replacing the some of the low frequency ADPCM data with the

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Shibuta Akira
• Suwa Yutaka
• Ishihara Hiroyuki
• Obana Kyoichi

Classifications

• H04L1/0042

  Encoding specially adapted to other signal generation operation, e.g. in order to reduce transmit distortions, jitter, or to improve signal shape (H04L1/0067 takes precedence) · CPC title

• H04B14/068

  with adaptive feedback · CPC title

• H04L1/0041

  Arrangements at the transmitter end · CPC title

• H03M13/09

  Error detection only, e.g. using cyclic redundancy check [CRC] codes or single parity bit · CPC title

• G10L19/005

  Correction of errors induced by the transmission channel, if related to the coding algorithm · CPC title