Scalar Quantizer Encoder

Specify the source of quantizer parameters as one of these:

Specify one of these partitioning methods to interpret the boundary points you enter:

Enter a vector of values in ascending order that represent the boundary points of the quantizer regions. These values are used to break up the set of input numbers into regions. Each region is specified by an index number.

Let N be the number of quantization regions. When the codebook is defined as [c1 c2 c3 ... cN], and the Boundary points parameter is defined as [p0 p1 p2 p3 ... pN], then p0<c1<p1<c2 ... p(N-1)<cN<pN for a regular quantizer. When your quantizer is bounded, from the Partitioning list, select Bounded. You need to specify N+1 boundary points, or [p0 p1 p2 p3 ... pN]. When your quantizer is unbounded, from the Partitioning list, select Unbounded. You need to specify N−1 boundary points, or[p1 p2 p3 ... p(N-1)]. The block sets p0 equal to −inf and pN equal to inf.

Tunable: Yes

Dependencies

To enable this parameter, select Specify via dialog from the Source of quantizer parameters list.

Specify the searching method the block uses to determine the region in which the input value is located (quantizer index):

Specify one of these actions to take when the input value is the same as the boundary point. This parameter determines the region to which the value is assigned.

Select this check box to output the codeword values that correspond to each index value at port Q(U).

Select this check box to output the quantization error for each input value at port Err. The quantization error is the difference between the input value and the quantized output value.

Enter a vector of quantized output values that correspond to each index value.

If you set the Partitioning parameter to Bounded and your boundary points vector has a length of N, then you must specify a codebook of length N−1. If you set the Partitioning parameter to Unbounded and your boundary points vector has a length of N, then you must specify a codebook of length N+1.

Tunable: Yes

Dependencies

To enable this parameter, select Specify via dialog from the Source of quantizer parameters list and select either the Output codeword or Output quantization error check box.

Specify the output clipping status on the port S. Any time an input value is outside the range defined by the Boundary points parameter, the block outputs a 1 at this port. When the value is inside the range, the block outputs a 0.

Dependencies

To enable this parameter, set the Partitioning parameter to Bounded.

Specify one of these actions the block must take when an input value is outside the range defined by the Boundary points parameter:

Suppose the boundary points for a bounded quantizer are defined as [p0 p1 p2 p3 ... pN] and the possible index values are defined as [i0 i1 i2 ... i(N-1)], where i0=0 and i0<i1<i2<...<i(N-1). When you want any input value less than p0 to be assigned to index value i0 and any input values greater than pN to be assigned to index value i(N-1), select Clip. When you want to be warned when clipping occurs, select Clip and warn. When you want the simulation to stop and the block to display an error when the index values are out of range, select Error.

Dependencies

To enable this parameter, set the Partitioning parameter to Bounded.

Specify the data type of the index output from the block at port I as one of these:

Specify the rounding mode for fixed-point operations as one of the following:

For more details, see rounding mode.

When you select this parameter, the block saturates the result of its fixed-point operation. When you clear this parameter, the block wraps the result of its fixed-point operation. For details on saturate and wrap, see overflow mode for fixed-point operations.