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SB3229 Datasheet(PDF) 11 Page - ON Semiconductor |
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SB3229 Datasheet(HTML) 11 Page - ON Semiconductor |
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11 / 17 page  RHYTHM SB3229 www.onsemi.com 11 There are three modes of operation: • Digital Volume Control Mode • Momentary Memory Select Mode • Mixed Mode (VC and MS) In Digital VC mode, the rocker switch provides the digital volume control functionality as described in this section. In Momentary Memory Select mode, the rocker switch allows cycling through the memory profiles in both directions. An “up” switch closure indicates a program advance to the next higher numbered memory and “down” switch closures indicates a program retreat to the next lower numbered memory. In this mode, volume control is only available through software control. In Mixed Mode, operation of the switch as a volume control or memory select is governed by the time duration of the switch closure: either short or long. The discrimination of short and long pulses is set by a programmable, time−threshold value, from 1 s to 5 s in 1 s increments. An additional programmable parameter determines whether the short pulses refer to volume−control operation or memory−select operation. If long pulses control memory select operation, the memory change is initiated once the switch is held for the long pulse period without requiring the switch to be released. In Digital VC mode or Momentary Memory Select mode, the action takes place after the switch is released. AGC−O The AGC−O module is an output limiting circuit with a fixed compression ratio of ∞ : 1. The limiting level is programmable as a level measured in dB from full scale. The maximum output of the device is 0 dBFS. The AGC−O module has its own level detector, with programmable attack and release time constants. Graphic Equalizer SB3229 has a 8−band graphic equalizer. Each band provides up to 24 dB of gain adjustment in 1 dB increments. Biquadratic Filters Additional frequency shaping can be achieved by configuring generic biquad filters. The transfer function for each of the biquad filters is as follows: H(z) + b0 ) b1 z*1 ) b2 z*2 1 ) a1 z*1 ) a2 z*2 NOTE: The a0 coefficient is hard−wired to always be ‘1’. The coefficients are each 16 bits in length and formatted as one sign bit, one integer bit and 14 fractional bits. This maps onto a decimal range of −2.0 to 2.0 before quantization (−32767 to 32767 after quantization). Thus, before quantization, the floating−point coefficients must be in the range −2.0 ≤ x < 2.0 and quantized with the function: round(x 214) After designing a filter, the quantized coefficients can be entered into the PreBiquads or PostBiquads tab in the Interactive Data Sheet. The coefficients b0, b1, b2, a1, and a2 are as defined in the transfer function above. The parameters meta0 and meta1 do not have any effect on the signal processing, but can be used to store additional information related to the associated biquad. The underlying code in the product components automatically checks all of the filters in the system for stability (i.e., the poles have to be within the unit circle) before updating the graphs on the screen or programming the coefficients into the hybrid. If the Interactive Data Sheet receives an exception from the underlying stability checking code, it automatically disables the biquad being modified and displays a warning message. When the filter is made stable again, it can be re−enabled. Also note that in some configurations, some of these filters may be used by the product component for microphone/telecoil compensation, low−frequency EQ, etc. If this is the case, the coefficients entered by the user into IDS are ignored and the filter designed by the software is programmed instead. For more information on filter design refer to the Biquad Filters In PARAGON® Digital Hybrid information note. Tinnitus Treatment Noise The Tinnitus Treatment noise is generated using white noise generator hardware and shaping the generated noise using four 2nd order biquadratic filters. The filter parameters are the same coefficients as those presented in the Biquadratic Filters section. The Tinnitus Treatment noise can be added into the signal path at two possible locations: before the VC (before the AGC−O, but compensated for the Wideband Gain) or after the VC (between the last generic biquad and the Cross Fader). If the noise is injected before the VC then the level of the noise will change along with the rest of the audio through the device when the VC is adjusted. If the noise is injected after the VC it is not affected by VC changes. EVOKE Lite Acoustic Indicators Ten Acoustic Indicators are available for indicating events. Each indicator is fixed to a particular event. Any event can have its assigned indicator enabled or disabled although not always independently. Individual enable/ disable control is provided for the following event or group of events: • Power on reset (POR) • Four memory selects • Volume Up and Volume Down • Volume Max and Volume Min • Low Battery Each Acoustic Indicator is made up of up to four faded tones. A faded tone exhibits a 64 ms fade−in and fade−out |
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