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

Access to Document

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,

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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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DO - 10.1109/MWSCAS.1998.759536

M3 - Conference contribution

AN - SCOPUS:85045574653

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EP - 487

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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