US Patent No: 8,160,272
Number of patents in Portfolio can not be more than 2000
Audio output circuits having ramped attenuation circuits that inhibit pop disturbances when audio sources are switched
Stats
-
Apr 17, 2012
Issued date -
Jul 15, 2008
filing date -
12/173,564
serial no -
In Force
status
Importance
Loading Importance Indicators...
Abstract
An audio output circuit includes a port attenuation circuit, which is configured to convert an abrupt dc voltage offset transition between a pair of audio signals received in sequence at an input thereof into a more gradual transition. This conversion is achieved by performing, in sequence, a ramp-to-mute operation on a first of the pair of audio signals and a ramp-from-mute operation on a second of the pair of audio signals. The ramp-to-mute operation includes ramping an output of the audio output circuit from a dc voltage offset associated with the first of the pair of audio signals to a reference dc voltage offset. The ramp-from-mute operation includes ramping the output of the audio output circuit from the reference dc voltage offset to a dc voltage offset associated with the second of the pair of audio signals. These ramping operations may be performed using voltage steps having uniform step size.
Loading the Abstract Image...
First Claim
Related Publications
Loading Related Publications...
International Classification(s)
- [Classification Symbol]
- [Patents Count]
Cited Art
| Patent Info | (Count) | # Cites | Year |
|---|---|---|---|
|
|
|||
| 6,301,366 Single-chip audio system mixing circuitry and methods | 22 | 1998 | |
| 6,405,093 Signal amplitude control circuitry and methods | 11 | 1998 | |
| 6,628,999 Single-chip audio system volume control circuitry and methods | 18 | 1998 | |
|
|
|||
| 6,154,548 Audio mute control signal generating circuit | 11 | 1997 | |
|
|
|||
| 6,111,965 Method and apparatus for offset compensation of a signal processing circuit | 8 | 1997 | |
|
|
|||
| 4,306,114 Automatic audio mixing selector device | 21 | 1980 | |
|
|
|||
| 2008/0204,133 Circuits and apparatus to reduce transient output noise in an audio amplifier | 4 | 2007 | |
|
|
|||
| 4,881,123 Voice override and amplitude control circuit | 14 | 1988 | |
Patent Citation Ranking
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 3.5 Year Payment | $1600.00 | $800.00 | $400.00 | Oct 17, 2015 |
| 7.5 Year Payment | $3600.00 | $1800.00 | $900.00 | Oct 17, 2019 |
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Oct 17, 2023 |
| Fee | Large entity fee | small entity fee | micro entity fee |
|---|---|---|---|
| Surcharge - 3.5 year - Late payment within 6 months | $160.00 | $80.00 | $40.00 |
| Surcharge - 7.5 year - Late payment within 6 months | $160.00 | $80.00 | $40.00 |
| Surcharge - 11.5 year - Late payment within 6 months | $160.00 | $80.00 | $40.00 |
| Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
| Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |