USBB13AP77016-XXX-B06 NEC Electronics, USBB13AP77016-XXX-B06 Datasheet - Page 18

• Manufacturer Part Number: USBB13AP77016-XXX-B06
• Description: DSP middleware(AMR voice CODEC)
• Manufacturer: NEC Electronics

2.2 Function Specifications
2.2.1 amr_InitEncoder function
function only once when using the encoder.
18
The amr_InitEncoder function initializes the constants, coefficient table, and buffers used for the encoder. Call this
[Classification]
[Function name]
[Summary of function] Initializes the RAM area necessary for processing the AMR speech CODEC encoder,
[Format]
[Argument]
[Return value]
[Registers used]
[Hardware resources] Maximum stack level:
Remark When calling this function, be sure to first secure static memory and scratch memory areas. For
details, refer to 2.3 Memory Structure.
DTX_OFF
DTX_ON_VAD1
DTX_ON_VAD2
DTX Mode
Encoder initialization function
amr_InitEncoder
sets the VAD mode, calls the amr_ResetEncoder function, and initializes parameters.
call amr_InitEncoder
None
R0, R1, DP0, DP1, DP4, DP5
Maximum loop stack level:
Maximum number of repetitions:
Maximum number of cycles:
Register
Type
CHAPTER 2 LIBRARY SPECIFICATIONS
Argument
Value
User’s Manual U15165EJ3V0UM
0
1
2
R0L
Table 2-1. DTX Mode
Silent compression function OFF
Silent compression function ON (VAD1 option)
Silent compression function ON (VAD2 option)
Turns ON/OFF DTX (silence compression function) (see Table 2-1)
1256
4
1
320
Description
Description