Bi-directional continuous voice and video quality testing system with TTMF tones

• US 20060245364A1
• Filed: 03/29/2005
• Published: 11/02/2006
• Est. Priority Date: 03/29/2005
• Status: Abandoned Application

• Current Assignee: Agilent Technologies, Inc.
• Original Assignee: Agilent Technologies, Inc.
• Inventors: Lau, David Kam Wing, Goh, Dennis Seow Hee, Zhu, Xing
• Application Number:
  US11/093,842
• Publication Number:
  US 20060245364A1
• Time in Patent Office: Days
• US Class Current: 370/241
• CPC Class Codes: H04L 65/80 Responding to QoS
• CPC Class Codes: H04M 3/2236 Quality of speech transmission monitoring

Abstract

A continuous bi-directional file-play-record voice and video quality tester system (“CFPR-VVQT”) for measuring the quality of voice or video communication links from a customer premises equipment (“CPE”) through a Network under Test to a voice and video quality tester (“VVQT”). The start and end of a set of quality testing sample signals are determined by a start flag signal and an end flag signal, respectively, generated by the CFPR-VVQT. The flag signals may be triple tone modulation frequency (“TTMF”) tones. The CFPR-VVQT will measure the quality testing sample signals, determine a signal quality test result, and then transmit the test results back through Network under Test to the originating VVQT.

Claims

1. A Continuous Bi-Directional File-Play-Record Voice and Video Quality Tester System (“

CFPR-VVQT”

) for measuring the signal transmission quality of a plurality of communication links from customer premises equipment (“

CPE”

) through a Network under Test to the CFPR-VVQT, the CFPR-VVQT comprising;

an Encode/Play Module in signal communication with at least one CPE through the Network Under Test;

a Decode/Record Module in signal communication with the Network Under Test and the Encode/Play Module;

a Testing Module in signal communication with the Encode/Play Module and the Decode/Record Module, wherein the Testing Module is configured to measure the signal transmission quality of the plurality of communication links and generate test results; and

a Storage Module in signal communication with the Decode/Record Module and the Testing Module.

2. The CFPR-VVQT of claim 1, wherein the Encode/Play Module is configured to:

receive quality testing sample signals related to a communication link from the at least one CPE;

generate start and end flag signals that indicate the start and end, respectively, of a transmission of a quality testing sample signal received from the at least one CPE;

receive the test results from the Testing Module, wherein the test results measure the signal quality of communication links from at least one other CPE in signal communication with the Network under Test;

embed the test results in the start and end flag signals; and

transmit the start flag signal, a quality testing sample signal from the at least one CPE, and the end flag signal through the Network under Test to the at least one other CPE.

3. The CFPR-VVQT of claim 2, wherein the Encode/Play Module is further capable of pausing the transmission through the Network under Test to the at least one other CPE between transmitting the start flag signal and the quality testing sample signal from the at least one CPE, and between transmitting the quality testing sample signal from the at least one CPE and the end flag signal.

4. The CFPR-VVQT of claim 2, wherein the Decode/Record Module is configured to:

receive the start and end flag signals and the quality testing sample signal from at least one other CPE;

identify the start and end flag signals;

record the quality testing sample signal from the at least one other CPE to memory in the CFPR-VVQT responsive to identifying the start flag signal;

terminate the recording of the quality testing sample signal from the at least one other CPE responsive to identifying the end flag signal;

decode the start and end flag signals to obtain the embedded test results; and

transmitting the recorded quality testing sample signal from the at least one other CPE and the embedded test results to the Storage Module.

5. The CFPR-VVQT of claim 4, wherein the Storage Module is configured to:

receive the quality testing sample signal from the Decode/Record Module;

receive embedded test results from the Decode/Record Module; and

store the quality testing sample signal and the embedded test results in a database.

6. The CFPR-VVQT of claim 5, wherein the start and end flag signals are Triple Tone Modulation Frequency (“

TTMF”

) tones.

7. The CFPR-VVQT of claim 6, wherein the test results from the Testing Module comprise a voice quality score that corresponds to the voice quality of the communication link, wherein the voice quality score is determined by utilizing a test measurement set chosen from the group consisting of:

a Perceptual Evaluation of Speech Quality (“

PESQ”

) test to determine the voice quality score;

a Perceptual Analysis/Measurement System (“

PAMS”

) test to determine the voice quality score;

a Perceptual Speech Quality Measurement (“

PSQM”

) test to determine the voice quality score; and

a Mean Opinion Score (MOS) test described by ITU-T Recommendation P.800.1 to determine the voice quality score.

8. The CFPR-VVQT of claim 6, wherein the test results from the Testing Module comprise a video quality score that corresponds to the video quality of the communication link, wherein the video quality score is determined by utilizing a test measurement set from American National Standards Institute (“

ANSI”

) T1.801.03-2003.

9. The CFPR-VVQT of claim 6, wherein the at least one CPE and the at least one other CPE are mobile communication devices configured to exchange test results from the Testing Module.

12. The method of claim 1, wherein the steps (a) through (j) of the method are repeated until terminated manually by operator intervention or automatically when the plurality of voice and video quality testing sample signals have all been measured.

13. The method of claim 12, wherein the first start flag signal, the second start flag signal, the first end flag signal, and the second end flag signal are TTMF tones.

14. The method of claim 13, further including:

maintaining the second-CPE quality testing sample signals recorded at the first VVQT and the test results obtained at the first VVQT in a database; and

maintaining the first-CPE quality testing sample signals recorded at the second VVQT and the test results obtained at the second VVQT in a database.

15. The method of claim 14, further including:

adjusting the length of the first start flag signal responsive to the decoding of the first start flag signal at the second VVQT;

adjusting the length of the first end flag signal responsive to the decoding of the first end flag signal at the second VVQT;

adjusting the length of the second start flag signal responsive to the decoding of the second start flag signal at the first VVQT; and

adjusting the length of the second end flag signal responsive to the decoding of the second end flag signal at the first VVQT.

10. A method for measuring the signal quality of communication links from a plurality of customer premises equipment (“

CPE”

) through a Network under Test, the method comprising;

receiving first-CPE quality testing sample signals from a first CPE in signal communication with the Network under Test at a first Voice/Video Quality Tester (“

VVQT”

);

generating a first start flag signal and a first end flag signal at the first VVQT;

transmitting the first start flag signal from the first VVQT to a second VVQT in signal communication with the Network under Test;

transmitting a first-CPE quality testing sample signal from the first VVQT to the second VVQT through the Network under Test;

transmitting the first end flag signal from the first VVQT to the second VVQT through the Network under Test;

receiving the first start flag signal at the second VVQT;

decoding the first start flag signal at the second VVQT;

receiving the first-CPE quality testing sample signal at the second VVQT;

recording the first-CPE quality testing sample signal at the second VVQT;

receiving the first end flag signal at the second VVQT;

decoding the first start end signal at the second VVQT;

testing the first-CPE quality testing sample signal at the second VVQT and obtaining test results;

generating a second start flag signal and a second end flag signal at the second VVQT;

embedding the test results in the second start flag signal and the second end flag signal;

receiving second-CPE quality testing sample signals from a second CPE in signal communication with the Network under Test at the second VVQT;

transmitting the second start flag signal from the second VVQT to the first VVQT through the Network under Test;

transmitting a second-CPE quality testing sample signal from the second VVQT to the first VVQT through the Network under Test; and

transmitting the second end flag signal from the second VVQT to the first VVQT through the Network under Test.

11. The method of claim 10, further including:

(a) receiving the second start flag signal at the first VVQT;

(b) decoding the second start flag signal at the first VVQT;

(c) receiving the second-CPE quality testing sample signal from the second VVQT at the first VVQT;

(d) recording the second-CPE quality testing sample signal at the first VVQT;

(e) receiving the second end flag signal at the first VVQT;

(f) decoding the second start flag signal at the first VVQT;

(g) testing the second-CPE quality testing sample signal from the second VVQT at the first VVQT and obtaining test results;

(h) generating another first start flag signal and another first end flag signal at the first VVQT;

(i) embedding the test results in the another first start flag signal and the another first end flag signal; and

(j) transmitting the another first start flag signal, the another first-CPE quality testing sample signal, and the another first end flag signal from the first VVQT to the second VVQT through the Network under Test.

16. A signal-bearing medium having software for continuously measuring the signal quality of a first communication link from a first customer premises equipment (“

CPE”

) through a Network under Test to a second CPE, and of a second communication link from the second CPE through the Network under Test to the first CPE, the signal-bearing medium comprising;

logic configured for receiving first-CPE quality testing sample signals from the first CPE at a first VVQT in signal communication with the Network under Test;

logic configured for receiving second-CPE quality testing sample signals from the second CPE at a second VVQT in signal communication with the Network under Test;

logic configured for generating first start and first end flag signals at the first VVQT;

logic configured for generating second start and second end flag signals at the second VVQT;

logic configured for transmitting a first start signal, a first-CPE quality testing sample signal, and a first end flag signal from the first VVQT to the second VVQT;

logic configured for transmitting a second start signal, a second-CPE quality testing sample signal, and a second end flag signal from the second VVQT to the first VVQT;

logic configured for receiving the second start signal, the second-CPE quality testing sample signal, and the second end flag signal from the second VVQT at the first VVQT;

logic configured for receiving the first start signal, the first-CPE quality testing sample signal, and the first end flag signals from the first VVQT at the second VVQT;

logic configured for testing the second-CPE quality testing sample signal received at the first VVQT;

logic configured for testing the first-CPE quality testing sample signals received at the second VVQT;

logic configured for transmitting test results obtained from testing the second-CPE quality testing sample signal received at the first VVQT to the second VVQT; and

logic configured for transmitting test results obtained from testing the first-CPE quality testing sample signal received at the second VVQT to the first VVQT.

17. The signal-bearing medium of claim 16, further including:

logic configured to repeat the transmission of the first start signal, a first-CPE quality testing sample signal, and the first end flag signal from the first VVQT to the second VVQT;

logic configured to repeat the transmission of the second start signal, another second-CPE quality testing sample signal, and the second end flag signal from the second VVQT to the first VVQT;

logic configured to repeat the testing of the another first-CPE quality testing sample signal transmitted from the first VVQT to the second VVQT; and

logic configured to repeat the testing of the another second-CPE quality testing sample signal transmitted from the second VVQT to the first VVQT.

18. The signal-bearing medium of claim 17, further including:

logic configured to delay the transmission of the first start flag signal, the first-CPE quality testing sample signal, and the first end flag signal from the first VVQT to the second VVQT responsive to the recording of first-CPE quality testing sample signals at the second VVQT; and

logic configured to delay the transmission of the second start signal, the second-CPE quality testing sample signal, and the second end flag signal from the second VVQT to the first VVQT responsive to the recording of second-CPE quality testing sample signals at the first VVQT.

19. The signal-bearing medium of claim 18, wherein the first start flag signal, the first end flag signal, the second start flag signal, and the second end flag signal are TTMF tones.

20. The signal-bearing medium of claim 19, further including:

logic configured for logging test results from the Testing Module of the first VVQT and from the Testing Module of the second VVQT; and

logic configured for maintaining the test results in a database.