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參數資料
型號： PCF5083
廠商： NXP Semiconductors N.V.
英文描述： STEEL COVER
中文描述： GSM信號處理IC
文件頁數： 84/136頁
文件大小： 602K
代理商： PCF5083
1996 Oct 29
84
Philips Semiconductors
Objective specification
GSM signal processing IC
PCF5083
SP_decoder_TCHFS
GSM full-rate speech decoder as defined in
“GSM Rec. 06.01, 06.10, 06.11, 06.12, 06.31 and 06.32” The following
tasks are performed:
Speech decoding algorithm.
Frame repetition and muting, in the event of a Bad Frame Indication (BFI)
and/or bad receive quality.
SID frame detection and Comfort Noise Insertion (CNI) in the event of
discontinuous transmission (DTX).
Integrated handsfree algorithm using a weighting balance and comfort
noise insertion.
The speech parameters in SCRATCH_BUFF are decoded. The audio
output data (see Table 32) is returned in SCRATCH_BUFF.
The three input parameters determine the operating mode of the speech
decoder. The dl_dtx_flag enables DTX in down link when set. Note that the
dl_dtx_flag should always be set to 1 except for test purposes.
The operation_mode consists of 3 fields: TMODE, HF and ATT. These
fields are shown in Table 62.
The TMODE field is copied to the audio output data (bits TM0 to TM2
according to Table 36) in accordance with “GSM recommendation 11.10,
section III.1.2.4.7” TMODE can take the following values:
TMODE = 0; normal operation.
TMODE = 1; test of speech decoder. In this test mode an automatic reset of
the internal state variables is performed if a rising edge of the RESD bit
contained in the audio input data (defined in Table 36) is detected.
TMODE = 2; test of speech encoder.
TMODE = 4; test of acoustic devices.
The HF fields enables (HF = 1) or disables (HF = 0) the handsfree mode of
the speech codec.
The ATT field has only a meaning in handsfree mode. It informs the
handsfree program about the attenuation between loudspeaker an
microphone in 3 dB steps. ATT = 0 means 0 dB, ATT = 7 means 21 dB. For
proper operation the ATT field has to be adjusted according to the volume
control of the loudspeaker. The arrangement of loudspeaker and
microphone has to be such that the attenuation at maximum volume level
does not exceed 0 dB.
The binary taf (time alignment flag) marks with taf = 1 those traffic frames
that are aligned with the SACCH multiframe structure defined in
“GSM Rec. 05.08”
51
dtx_flag
taf
operation_mode
DESCRIPTION
ID
PARAMETERS
RETURN
VALUES
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相關代理商/技術參數
參數描述
PCF5083H/001/F2 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:GSM signal processing IC
PCF5083H/5V2/F3 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:GSM signal processing IC
PCF5083H/F2 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:GSM signal processing IC
PCF51AC128ACFUE 功能描述:32位微控制器 - MCU 32 Bit 128K FLASH 32K RAM CAN EN RoHS:否 制造商:Texas Instruments 核心:C28x 處理器系列:TMS320F28x 數據總線寬度:32 bit 最大時鐘頻率:90 MHz 程序存儲器大小:64 KB 數據 RAM 大小:26 KB 片上 ADC:Yes 工作電源電壓:2.97 V to 3.63 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:LQFP-80 安裝風格:SMD/SMT
PCF51AC128ACLKE 功能描述:32位微控制器 - MCU 32 Bit 128K FLASH 32K RAM CAN EN RoHS:否 制造商:Texas Instruments 核心:C28x 處理器系列:TMS320F28x 數據總線寬度:32 bit 最大時鐘頻率:90 MHz 程序存儲器大小:64 KB 數據 RAM 大小:26 KB 片上 ADC:Yes 工作電源電壓:2.97 V to 3.63 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:LQFP-80 安裝風格:SMD/SMT
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