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SB3231-E1 Scheda tecnica(PDF) 11 Page - ON Semiconductor |
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SB3231-E1 Scheda tecnica(HTML) 11 Page - ON Semiconductor |
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11 / 18 page  RHYTHM SB3231 www.onsemi.com 11 transitions to an intermediate memory before reaching the final memory. The part starts in whatever memory the switches are selecting. If a memory is invalid, the part defaults to memory A. Table 6. STATIC SWITCH TRUTH TABLE: D−ONLY DISABLED State (MS1/MS2) Selected Memory OPEN OPEN Memory A CLOSED OPEN Memory B OPEN CLOSED Memory C CLOSED CLOSED Memory D Mode 4: Static Switch on MS1, Static Switch on MS2 (D−Only, Jump to Last Memory) This mode uses two static switches to change memories. Similar to the behaviour described in the Static Switch on MS1 and MS2 section, this mode will switch to memory D if the static switch on MS2 is HIGH (the state of the switch on MS1 is ignored). The mode, however, supports a maximum of three memories (even if four valid memories are programmed). This mode can be used to support the Automatic Telecoil feature (see the Automatic Telecoil section). In this mode, it is possible to jump from any memory to any other memory by changing the state of both switches. If the two switches are changed one after the other, the part transitions to an intermediate memory before reaching the final memory. The part starts in whatever memory the switches are selecting. If a memory is invalid, the part defaults to memory A. Table 7. STATIC SWITCH TRUTH TABLE: D−ONLY ENABLED; (EXAMPLE WITH THREE VALID MEMORIES) State (MS1/MS2) Selected Memory OPEN OPEN Memory A CLOSED OPEN Memory B X CLOSED Memory D Rocker Switch Support The device supports connection of a rocker switch to the digital volume control interface that can perform volume control (VC) adjustments and/or memory selection (MS). 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 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 Rhythm SB3231 has a 8−band graphic equalizer. Each band provides up to 31 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. |
Codice articolo simile - SB3231-E1 |
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