---
title: vDSP_biquadm_SetTargetsSingle
framework: Kernel
role: symbol
role_heading: Function
platforms: [macOS 10.11+]
path: kernel/1579946-vdsp_biquadm_settargetssingle
---

# vDSP_biquadm_SetTargetsSingle

Sets target values for selected single-precision coefficients within a valid single-precision multichannel biquad IIR filter object.

## Declaration

```occ
void vDSP_biquadm_SetTargetsSingle(vDSP_biquadm_Setup __setup, const float *__targets, float __interp_rate, float __interp_threshold, vDSP_Length __start_sec, vDSP_Length __start_chn, vDSP_Length __nsec, vDSP_Length __nchn);
```

## Parameters

- `__setup`: The filter state object whose coefficients the function updates.
- `__targets`: An input array of single-precision target values to the function applies to selected coefficients.
- `__rate`: The rate constant that determines the size of increments to the coefficient values. The rate’s value must be greater than zero, otherwise the function’s behavior is undefined.
- `__threshold`: The threshold constant that determines how close a coefficient’s value must be to the target value before incrementation stops. The threshold’s value must be greater than zero, otherwise the function’s behavior is undefined.
- `__start_sec`: The first section to update in each channel.
- `__start_chn`: The first channel to update.
- `__nsec`: The number of sections to update in each channel.
- `__nchn`: The number of channels to update.

## Discussion

Discussion Provide the filter coefficient targets as single-precision values. The function increments each selected coefficient at each sample until the difference between its value and the target value is less than a specified threshold. The last four parameters define which coefficients the function changes. The actual increment for each selected coefficient is a function of the rate constant and the difference between the target value and its initial value. This function doesn’t allocate any additional memory.