Electrical audio signal processing systems and devices – Hearing aids – electrical – Specified casing or housing
Patent
1993-01-14
1995-05-09
MacDonald, Allen R.
Electrical audio signal processing systems and devices
Hearing aids, electrical
Specified casing or housing
395 2, 395 21, 395 231, 395 233, 381 41, G10L 302
Patent
active
054147964
ABSTRACT:
An apparatus and method for performing speech signal compression, by variable rate coding of frames of digitized speech samples. The level of speech activity for each frame of digitized speech samples is determined and an output data packet rate is selected from a set of rates based upon the determined level of frame speech activity. A lowest rate of the set of rates corresponds to a detected minimum level of speech activity, such as background noise or pauses in speech, while a highest rate corresponds to a detected maximum level of speech activity, such as active vocalization. Each frame is then coded according to a predetermined coding format for the selected rate wherein each rate has a corresponding number of bits representative of the coded frame. A data packet is provided for each coded frame with each output data packet of a bit rate corresponding to the selected rate.
REFERENCES:
patent: 32580 (1888-01-01), Atal et al.
patent: 3633107 (1972-01-01), Brady
patent: 4012595 (1977-03-01), Ota
patent: 4076958 (1978-02-01), Fulghum
patent: 4214125 (1980-07-01), Mozer et al.
patent: 4360708 (1982-11-01), Taguchi et al.
patent: 4379949 (1983-04-01), Chen et al.
patent: 4535472 (1985-08-01), Tomcik
patent: 4610022 (1986-09-01), Kitayama et al.
patent: 4672669 (1987-01-01), DesBlache et al.
patent: 4672670 (1987-06-01), Wang et al.
patent: 4677671 (1987-06-01), Galand et al.
patent: 4771465 (1988-09-01), Bronson et al.
patent: 4797925 (1989-01-01), Lin
patent: 4797929 (1989-01-01), Gerson et al.
patent: 4827517 (1989-05-01), Atal et al.
patent: 4831636 (1989-05-01), Taniguchi et al.
patent: 4843612 (1989-06-01), Brusch et al.
patent: 4850022 (1989-06-01), Honda et al.
patent: 4852179 (1989-07-01), Fette
patent: 4856068 (1989-08-01), Quatieri, Jr. et al.
patent: 4864561 (1989-09-01), Ashenfelter et al.
patent: 4868867 (1989-09-01), Davidson et al.
patent: 4885790 (1989-12-01), McAulay et al.
patent: 4890327 (1989-12-01), Bertrand et al.
patent: 4896361 (1990-01-01), Gerson
patent: 4899384 (1990-02-01), Crouse et al.
patent: 4899385 (1990-02-01), Ketchum et al.
patent: 4903301 (1990-02-01), Kondo et al.
patent: 4905288 (1990-02-01), Gerson et al.
patent: 4918734 (1990-04-01), Muramatsu et al.
patent: 4933957 (1990-06-01), Bottau et al.
patent: 4937873 (1990-06-01), McAulay et al.
patent: 4965789 (1990-10-01), Bottau et al.
patent: 4991214 (1991-02-01), Freeman et al.
patent: 5007092 (1991-04-01), Galand et al.
patent: 5023910 (1991-06-01), Thomson
patent: 5054072 (1991-10-01), McAulay et al.
patent: 5060269 (1991-10-01), Zinser
patent: 5077798 (1991-12-01), Ichikawa et al.
patent: 5091945 (1992-02-01), Kleijn
patent: 5093863 (1992-03-01), Galand et al.
patent: 5103459 (1992-04-01), Gilhousen et al.
patent: 5113448 (1992-05-01), Nomura et al.
patent: 5140638 (1992-08-01), Moulsley et al.
patent: 5159611 (1992-10-01), Tomita et al.
patent: 5161210 (1992-11-01), Druyvesteyn et al.
patent: 5187745 (1993-02-01), Yip et al.
patent: 5202953 (1993-04-01), Taguchi
patent: 5214741 (1993-05-01), Akamine et al.
patent: 5222189 (1993-06-01), Fielder
patent: 5235671 (1993-08-01), Mazor
W. Bastiaan Kleijn, Daniel J. Krasinski, and Richard H. Ketchum, "Fast Methods for the CLEP Speech Coding Algorithm". IEEE Transaction on Signal Processing vol. 38, No. 8 Aug. 1990.
Richard C. Rose, Thomas P. Barnwell, III, "Design and Performance of an Analysis-by-Synthesis Class of Predictive Speech Coders". IEEE Transactions on Signal Processing, vol. 38, No. 9 Sep. 1990.
Ioannis S. Dedes, Dhadesugoor R. Vaman, and Cadathur V. Chakravarthy, "Variable Rate Adaptive Predictive Filter". IEEE Transactions on Signal Processing. vol. 40, No. 3 Mar. 1992.
"DSP Chips can Produce Random Numbers Using Proven Algorithm" by Paul Menner, EDN, Jan. 21, 1991, pp. 141-145.
"Variable Rate Speech Coding: A Review" by N. S. Jayans, 1984 IEEE.
"Variable Rate Speech Coding with Onling Segmentation and Fast Algebraic Codes" by R. DiFrancesco et al, 1990 IEEE pp. 233-236.
"Finite State CELP for Variable Rate Speech Coding" by Saeed V. Vaseghi, 1990 IEEE, pp. 37-40.
"Variable Rate Speech Coding for Asynchronous Transfer Mode" by Hiroshi Nakada et al., 1990 IEEE Transaction on Communications, vol. 38, No. 3, Mar. 1990, pp. 277-284.
"A 4.8 KBPS Code Excited Linear Predictive Coder" by Thomas E. Tremain et al., Proceedings of the Mobile Satellite Conference, 1988.
"Stochastic Coding of Speech Signals at Very Low Bit Rates" by Bishnu S. Atal, et al., 1984 IEEE.
Taniguchi et al, "Combined source and channel coding based on multimode coding"; ICASSP 90: 1990 Inter. Conf. on Acoustics, Speech and Signal Processing; 3-6 Apr. 1990, pp. 477-480 vol. 1.
Swaminathan et al, "Half Rate CELP codec candidate for North American digital cellular systems"; 1992 IEEE Inter. Conf. on Selected Topics in Wireless Communications; pp. 192-194.
Taniguchi et al, "ADPCM with a multiquantizer for speech coding"; IEEE Journal on Selectid Areas in Communications; Feb. 1988, pp. 410-424, vol. 6 iss. 2.
Atal et al. "Adaptive Predictive Coding of Speech Signals", The Bell System Technical Journal, Oct. 1970, pp. 229-238.
Schroeder et al. "Stochastic Coding of Speech Signals at Very Low Bit Rates: the Importance of Speech Perception," Speech Communication 4 (1985), pp. 155-162.
Schroeder et al. "Code-Excited Linear Prediction (CELP): High-Quality Speech at Very Low Bit Rates," 1985 IEEE Communications, pp. 9370940 (25.1.1-25.1.4).
Bishnu S. Atal. "Predictive Coding of Speech at Low Bit Rates", IEEE Transactions on Communications, vol. Com-30, No. 4, Apr. 1982, pp. 600-614.
Shinghai et al. "Improving Performance of Multi-Pulse LPC Coders at Low Bit Rates", IEEE Transactions on Communications, 1984, pp. 1.3.1-1.3.4.
Atal et al. "Stochastic Coding of Speech Signals at Very Low Bit Rates," 1984 IEEE.
Wang et al. "Phonetically-Based Vector Excitation Coding of Speech at 3.6 kbps," 1989 IEEE, pp. 49-52.
Gardner William R.
Gilhousen Klein S.
Jacobs Paul E.
Lam S. Katherine
Lee Chong U.
English Sean
Hafiz Tariq
MacDonald Allen R.
Miller Russell B.
Qualcomm Incorporated
LandOfFree
Variable rate vocoder does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Variable rate vocoder, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Variable rate vocoder will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1712123