A voice-band audio processor IC for CDMA applications

Bertan Bakkaloglu; Brian L. Evans; D. George Gata; James R. Hellums; James J. Hidon; James R. Hochschild; Gary Lin; John M. Muza; Zhengwei Zhang

doi:10.1109/MWSCAS.1998.759536

A voice-band audio processor IC for CDMA applications

Bertan Bakkaloglu, Brian L. Evans, D. George Gata, James R. Hellums, James J. Hidon, James R. Hochschild, Gary Lin, John M. Muza, Zhengwei Zhang

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

A 2.7 V voice-band audio processor (VBAP^TM) IC for CDMA wireless handsets as presented, The chip consists of transmit (uplink) and receive (downlink) audio channels and runs at a nominal current consumption of 9.1 mA. The transmit channel has two differential microphone inputs with external filtering and gain option for signal conditioning before a ΣΔ ADC. The transmit channel pre-emphasis filter, receive channel filter, part of transmit gain, receive gain, receive volume control and sidetone gains are achieved by a single DSP core. The receive channel has a differential and a single-ended speaker interface which can deliver 35 mW and 10 mW to a 32 ω load respectively. The PCM encoding and decoding can be achieved in both linear and μ-law companded modes. Due to the PLL/clock recovery circuitry the 13-bit ΣΔ voiceband codec is immune to system clock jitter up to 37%.

Original language	English (US)
Title of host publication	Proceedings - 1998 Midwest Symposium on Circuits and Systems, MWSCAS 1998
Publisher	Institute of Electrical and Electronics Engineers Inc.
Pages	484-487
Number of pages	4
ISBN (Electronic)	0818689145
DOIs	https://doi.org/10.1109/MWSCAS.1998.759536
State	Published - Jan 1 1998
Externally published	Yes
Event	1998 Midwest Symposium on Circuits and Systems, MWSCAS 1998 - Notre Dame, United States Duration: Aug 9 1998 → Aug 12 1998

Other

Other	1998 Midwest Symposium on Circuits and Systems, MWSCAS 1998
Country/Territory	United States
City	Notre Dame
Period	8/9/98 → 8/12/98

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

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10.1109/MWSCAS.1998.759536

Cite this

Bakkaloglu, B., Evans, B. L., Gata, D. G., Hellums, J. R., Hidon, J. J., Hochschild, J. R., Lin, G., Muza, J. M., & Zhang, Z. (1998). A voice-band audio processor IC for CDMA applications. In Proceedings - 1998 Midwest Symposium on Circuits and Systems, MWSCAS 1998 (pp. 484-487). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/MWSCAS.1998.759536

Bakkaloglu, B, Evans, BL, Gata, DG, Hellums, JR, Hidon, JJ, Hochschild, JR, Lin, G, Muza, JM & Zhang, Z 1998, A voice-band audio processor IC for CDMA applications. in Proceedings - 1998 Midwest Symposium on Circuits and Systems, MWSCAS 1998. Institute of Electrical and Electronics Engineers Inc., pp. 484-487, 1998 Midwest Symposium on Circuits and Systems, MWSCAS 1998, Notre Dame, United States, 8/9/98. https://doi.org/10.1109/MWSCAS.1998.759536

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title = "A voice-band audio processor IC for CDMA applications",

abstract = "A 2.7 V voice-band audio processor (VBAPTM) IC for CDMA wireless handsets as presented, The chip consists of transmit (uplink) and receive (downlink) audio channels and runs at a nominal current consumption of 9.1 mA. The transmit channel has two differential microphone inputs with external filtering and gain option for signal conditioning before a ΣΔ ADC. The transmit channel pre-emphasis filter, receive channel filter, part of transmit gain, receive gain, receive volume control and sidetone gains are achieved by a single DSP core. The receive channel has a differential and a single-ended speaker interface which can deliver 35 mW and 10 mW to a 32 ω load respectively. The PCM encoding and decoding can be achieved in both linear and μ-law companded modes. Due to the PLL/clock recovery circuitry the 13-bit ΣΔ voiceband codec is immune to system clock jitter up to 37%.",

author = "Bertan Bakkaloglu and Evans, {Brian L.} and Gata, {D. George} and Hellums, {James R.} and Hidon, {James J.} and Hochschild, {James R.} and Gary Lin and Muza, {John M.} and Zhengwei Zhang",

year = "1998",

month = jan,

day = "1",

doi = "10.1109/MWSCAS.1998.759536",

language = "English (US)",

pages = "484--487",

booktitle = "Proceedings - 1998 Midwest Symposium on Circuits and Systems, MWSCAS 1998",

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AU - Bakkaloglu, Bertan

AU - Evans, Brian L.

AU - Gata, D. George

AU - Hellums, James R.

AU - Hidon, James J.

AU - Hochschild, James R.

AU - Lin, Gary

AU - Muza, John M.

AU - Zhang, Zhengwei

PY - 1998/1/1

Y1 - 1998/1/1

N2 - A 2.7 V voice-band audio processor (VBAPTM) IC for CDMA wireless handsets as presented, The chip consists of transmit (uplink) and receive (downlink) audio channels and runs at a nominal current consumption of 9.1 mA. The transmit channel has two differential microphone inputs with external filtering and gain option for signal conditioning before a ΣΔ ADC. The transmit channel pre-emphasis filter, receive channel filter, part of transmit gain, receive gain, receive volume control and sidetone gains are achieved by a single DSP core. The receive channel has a differential and a single-ended speaker interface which can deliver 35 mW and 10 mW to a 32 ω load respectively. The PCM encoding and decoding can be achieved in both linear and μ-law companded modes. Due to the PLL/clock recovery circuitry the 13-bit ΣΔ voiceband codec is immune to system clock jitter up to 37%.

AB - A 2.7 V voice-band audio processor (VBAPTM) IC for CDMA wireless handsets as presented, The chip consists of transmit (uplink) and receive (downlink) audio channels and runs at a nominal current consumption of 9.1 mA. The transmit channel has two differential microphone inputs with external filtering and gain option for signal conditioning before a ΣΔ ADC. The transmit channel pre-emphasis filter, receive channel filter, part of transmit gain, receive gain, receive volume control and sidetone gains are achieved by a single DSP core. The receive channel has a differential and a single-ended speaker interface which can deliver 35 mW and 10 mW to a 32 ω load respectively. The PCM encoding and decoding can be achieved in both linear and μ-law companded modes. Due to the PLL/clock recovery circuitry the 13-bit ΣΔ voiceband codec is immune to system clock jitter up to 37%.

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BT - Proceedings - 1998 Midwest Symposium on Circuits and Systems, MWSCAS 1998

PB - Institute of Electrical and Electronics Engineers Inc.

T2 - 1998 Midwest Symposium on Circuits and Systems, MWSCAS 1998

Y2 - 9 August 1998 through 12 August 1998

ER -

A voice-band audio processor IC for CDMA applications

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