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Frame To Samples

Convert frame-based data to sample stream

  • Library:
  • Wireless HDL Toolbox / I/O Interfaces

  • Frame To Samples block

Description

The Frame To Samples block flattens frame-based input into a stream of samples. The block also returns a stream of corresponding control signals that indicate sample validity and the boundaries of the frame. You can configure idle cycles inserted between samples or between frames, and how many values represent each sample. See Streaming Sample Interface for details of the streaming format.

Use this block to generate input for a subsystem targeted for HDL code generation. This block does not support HDL code generation.

Ports

Input

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Frame of input samples, specified as a column vector. All samples in the vector are considered valid. Each frame must be the same size.

Data Types: single | double | int8 | int16 | int32 | uint8 | uint16 | uint32 | Boolean | fixed point

Output

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Output sample stream, returned Output size values at a time. The output stream includes idle samples as specified by Idle cycles between samples and Idle cycles between frames. Each output sample has a corresponding set of control signals on the ctrl port.

Data Types: single | double | int8 | int16 | int32 | uint8 | uint16 | uint32 | Boolean | fixed point

Control signals accompanying the sample stream, returned as a samplecontrol bus. The bus includes the start, end, and valid control signals, which indicate the boundaries of the frame and the validity of the samples.

  • start — Indicates the start of the output frame

  • end — Indicates the end of the output frame

  • valid — Indicates that the data on the output data port is valid

For more detail, see Sample Control Bus.

Data Types: bus

Parameters

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Number of idle cycles to insert after each sample, specified as a scalar integer. The block returns a vector of Output size zeros for each idle cycle and sets all control signals to 0 (false).

Number of idle cycles to insert at the end of each frame, specified as a scalar integer. The block returns a vector of Output size zeros for each idle cycle and sets all control signals to 0 (false).

Number of values representing each sample, specified as a positive integer scalar. The block outputs a vector of Output size values. Each vector has one corresponding set of control signals. For example, you can use this parameter to serialize turbo-encoded samples. In the LTE standard, the turbo code rate is 1/3, so each sample is represented by one systematic value and two parity values: S_n, P1_n, and P2_n. In this case, set Output size to 3.

Order of output samples relative to input order, when more than one value represents each sample. For example, for 1/3 turbo-encoded samples, the input frame can be ordered [S_1 P1_1 P2_1 S_2 P1_2 P2_2] or [S_1 S_2 P1_1 P1_2 P2_1 P2_2]. In the first case, the output is two vectors, [S_1 P1_1 P2_1] and [S_2 P1_2 P2_2]. To achieve the same output in the second case, select Compose output from interleaved input samples.

Dependencies

This parameter applies when Output size is greater than one.

Extended Capabilities

Introduced in R2017b