Li Hsiang Chang

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:

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.

US Patent:

7949419, May 24, 2011

Filed:

Nov 30, 2006

Appl. No.:

11/565358

Inventors:

Hongwei Kong - Denville NJ, US
Nelson Sollenberger - Farmingdale NJ, US
Li Fung Chang - Holmdel NJ, US

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

G06F 17/00
H03G 3/00
H04B 1/06
H04B 7/00

US Classification:

700 94, 381104, 4552411

Abstract:

Methods and systems for processing audio signals are disclosed herein. Aspects of the method may comprise controlling gain during multipath, multi-rate audio processing by generating via a digital gain circuit, a digital signal that is a product of an input digital signal and a gain coefficient derived from a lookup table, and bit-shifted to generate a digital output signal. The gain coefficient may be partitioned into a number of gain blocks. The gain values in each of the gain blocks may be twice a corresponding value in each preceding gain block. The gain blocks may be partitioned into steps that represent particular gain values within a range associated with the gain block. The digital output signal may be ramped utilizing a linear interpolation of the gain coefficients one step apart over a number of samples of the digital input signal, where the number of samples is given as a power of two.

US Patent:

8103022, Jan 24, 2012

Filed:

Nov 30, 2006

Appl. No.:

11/565576

Inventors:

Hongwei Kong - Denville NJ, US
Nelson Sollenberger - Farmingdale NJ, US
Li Fung Chang - Holmdel NJ, US
Andy Tong - Redwood City CA, US
Todd L. Brooks - Laguna Beach CA, US
Claude Hayek - Huntington Beach CA, US

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H04R 3/00
H04B 1/38

US Classification:

381111, 455574

Abstract:

Methods and systems for detecting, and controlling power for, an auxiliary microphone are disclosed. Aspects of one method may include a detection block intermittently enabling a bias circuit block to provide a bias signal to determine if an auxiliary microphone may be communicatively coupled to a mobile device. The detection block may process 1-bit digital samples received from the bias circuit bock to determine whether the auxiliary microphone may be communicatively coupled. The detection block may also process the 1-bit digital samples to determine if a button associated with the auxiliary microphone may have been pushed or activated.