Li C Chang

US Patent:

7027539, Apr 11, 2006

Filed:

Dec 9, 2003

Appl. No.:

10/731858

Inventors:

Baoguo Yang - Iselin NJ, US
Li Fung Chang - Holmdel NJ, US
Zhijun Gong - Iselin NJ, US

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H04B 1/10

US Classification:

375350, 375346, 455307, 708300

Abstract:

A wireless communication device processes N Radio Frequency (RF) bursts contained within N slots of a digital communications time divided frame, wherein N is a positive integer greater than one. The wireless communication device includes an RF front end, a baseband processor, and an equalizer module. The RF from end is operable to receive the plurality of received RF bursts and to convert the RF bursts to corresponding baseband signals. The baseband processor operably couples to the RF front end, is operable to receive the baseband signals, is operable to pre-equalization process the baseband signals to produce processed baseband signals, and is operable to post-equalization process soft decisions. The equalizer module operably couples to the baseband processor and is operable to equalize the processed baseband signals to produce the soft decisions. These RF bursts may be contained in adjacent slots or, in non-adjacent slots, or in a combination of adjacent slots and non-adjacent slots.

US Patent:

7463170, Dec 9, 2008

Filed:

Nov 30, 2006

Appl. No.:

11/565414

Inventors:

Hongwei Kong - Denville NJ, US
Huaiyi (Hanks) Zeng - Red Bank NJ, US
Nelson Sollenberger - Farmingdale NJ, US
Li Fung Chang - Holmdel NJ, US
Taiya Cheng - San Jose CA, US
Claude Hayek - Huntington Beach CA, US

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H03M 7/00

US Classification:

341 61, 381 17

Abstract:

An audio codec in a wireless device may be utilized for up sampling two or more audio signals to a same data sampling rate. Each audio signal, such as digital audio, voice, and polyringer, for example, may be received at one of a plurality of data sampling rates. Audio signals may be equalized and/or compensated with an FIR filter before up sampling or with an IIR filter to reduce overall processing latency. Multiple half-band interpolation operations may perform the up sampling. The first half-band filter may be replaced by an IIR filter to reduce overall processing latency. A gain of the up-sampled data may be adjusted to reduce noise effects. The channels of the up-sampled audio signals may be mixed and later further up sampled for subsequent communication to an output device. The up-sampled mixed audio signals may be down sampled for communication to a Bluetooth radio.

US Patent:

7515071, Apr 7, 2009

Filed:

Nov 30, 2006

Appl. No.:

11/565591

Inventors:

Hongwei Kong - Denville NJ, US
Li Fung Chang - Holmdel NJ, US

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H03M 7/00

US Classification:

341 50, 455574

Abstract:

Methods and systems for audio CODEC voice ADC processing are disclosed. Aspects of one method may include using a decimating filter that may be enabled to generate 13 MHz, 9-level digital output signal from a 26 MHz, 3-level digital input signal. The 13 MHz, 9-level digital output signal may be processed for RF transmission, for audio output to an output device, and/or utilized for testing by a test fixture, for example. The 13 MHz, 9-level digital output signal may be further processed to generate a 6. 5 MHz, 33-level digital signal. The 6. 5 MHz, 33-level digital signal may be converted to an analog signal, and processed for audio output and/or testing. The 13 MHz, 9-level digital output signal may also be processed to generate a 40 KHz, 17-bit digital signal, which may be communicated to a test equipment or further processed for RF transmission.

US Patent:

7542523, Jun 2, 2009

Filed:

Nov 2, 2005

Appl. No.:

11/265021

Inventors:

Baoguo Yang - Iselin NJ, US
Li Fung Chang - Holmdel NJ, US
Zhijun Gong - Iselin NJ, US

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H03K 9/00

US Classification:

375316, 375229, 375350, 375346, 455307, 708300

Abstract:

A wireless communication device processes N Radio Frequency (RF) bursts contained within N slots of a digital communications time divided frame, wherein N is a positive integer greater than one. The wireless communication device includes an RF front end, a baseband processor, and an equalizer module. The RF front end is operable to receive the plurality of received RF bursts and to convert the RF bursts to corresponding baseband signals. The baseband is operable to receive the baseband signals, to pre-equalization process the baseband signals to produce processed baseband signals, and to post-equalization process soft decisions. The equalizer module is operable to equalize the processed baseband signals to produce the soft decisions. These RF bursts may be contained in adjacent slots or, in non-adjacent slots, or in a combination of adjacent slots and non-adjacent slots.

US Patent:

7852239, Dec 14, 2010

Filed:

Oct 13, 2008

Appl. No.:

12/250233

Inventors:

Hongwei Kong - Denville NJ, US
Huaiyi (Hanks) Zeng - Red Bank NJ, US
Nelson Sollenberger - Farmingdale NJ, US
Li Fung Chang - Holmdel NJ, US
Taiya Cheng - San Jose CA, US
Claude Hayek - Huntington Beach CA, US

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H03M 7/00

US Classification:

341 61, 712 36

Abstract:

One or more circuits in a mobile phone may be utilized for up sampling two or more audio signals to a same data sampling rate. Each audio signal, such as digital audio, voice, and polyringer, for example, may be received at one of a plurality of data sampling rates and one or more of the following wireless standards: WCDMA, HSDPA, GSM, GPRS, EDGE, and/or Bluetooth. Audio signals may be equalized and/or compensated with an FIR filter before up sampling or with an IIR filter to reduce overall processing latency. Multiple half-band interpolation operations may perform the up sampling. The first half-band filter may be replaced by an IIR filter to reduce overall processing latency. A gain of the up-sampled data may be adjusted to reduce noise effects. The channels of the up-sampled audio signals may be mixed and later further up sampled for subsequent communication to an output device.

US Patent:

7877071, Jan 25, 2011

Filed:

Dec 26, 2007

Appl. No.:

11/964066

Inventors:

Hongwei Kong - Denville NJ, US
Li Fung Chang - Holmdel NJ, US
Pan Liu - Cliffwood NJ, US

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H04B 17/00
H04B 1/06

US Classification:

4552261, 4552341, 455272, 375345

Abstract:

Apparatus and method to provide unified STTD/CLTD dedicated pilot processing in a wireless receiver. The technique allows different set of parameters to be introduced to a same processing module to process STTD and CLTD diversity signals to recover a pilot signal. Introducing another set of parameters to the processing module also allows processing of a non-diversity signal to recover a pilot. The unified processing of STTD/CLTD signals is achieved by converting STTD/CLTD pilot bits as Hadamard-like bits and processing these bits along with orthogonal pilot bits which are encoded as Hadamard encoded bits.

US Patent:

7912728, Mar 22, 2011

Filed:

Nov 30, 2006

Appl. No.:

11/565373

Inventors:

Hongwei Kong - Denville NJ, US
Nelson Sollenberger - Farmingdale NJ, US
Li Fung Chang - Holmdel NJ, US
Claude Hayek - Huntington Beach CA, US
Taiyi Cheng - San Jose CA, US

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H04J 3/22
H03M 7/00

US Classification:

704500, 341 61, 370538, 370545, 381119

Abstract:

An audio codec in a baseband processor may be utilized for mixing audio signals received at a plurality of data sampling rates. The mixed audio signals may be up sampled to a very large sampling rate, and then down sampled to a specified sampling rate that is compatible with a Bluetooth-enabled device by utilizing an interpolator in the audio codec. The down-sampled signals may be communicated to Bluetooth-enabled devices, such as Bluetooth headsets, or Bluetooth-enabled devices with a USB interface. The interpolator may be a linear interpolator for which the audio codec may enable generation of triggering and/or coefficient signals based on the specified output sampling rate. An interpolation coefficient may be generated based on a base value associated with the specified output sampling rate. The audio codec may enable selecting the specified output sampling rate from a plurality of rates.

US Patent:

7936288, May 3, 2011

Filed:

Apr 3, 2009

Appl. No.:

12/418017

Inventors:

Hongwei Kong - Denville NJ, US
Li Fung Chang - Holmdel NJ, US

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H03M 5/02

US Classification:

341 56, 455574

Abstract:

Methods and systems for audio CODEC voice ADC processing are disclosed. Aspects of one method may include using a decimating filter that may be enabled to generate 13 MHz, 9-level digital output signal from a 26 MHz, 3-level digital input signal. The 13 MHz, 9-level digital output signal may be processed for RF transmission, for audio output to an output device, and/or utilized for testing by a test fixture, for example. The 13 MHz, 9-level digital output signal may be further processed to generate a 6. 5 MHz, 33-level digital signal. The 6. 5 MHz, 33-level digital signal may be converted to an analog signal, and processed for audio output and/or testing. The 13 MHz, 9-level digital output signal may also be processed to generate a 40 KHz, 17-bit digital signal, which may be communicated to a test equipment or further processed for RF transmission.