KR940004979A - Band Division Coding Device - Google Patents

Abstract

The present invention relates to a band split encoder for dividing video and audio signals into a plurality of divided bands and encoding the divided bands according to band characteristics. The band split coder sets the signal-to-noise ratio (SNR) value of the quantizer according to the bit used by setting the signal-to-noise ratio necessary for the band-splitting coding of speech or music signals as an input variable. And an adaptive bit allocator 6 for allocating bits to the subdivided bands.

Description

Band and Division Coding Device

Since this is an open matter, no full text was included.

1 is a schematic block diagram of a band division encoding apparatus according to the present invention;

2 is a flowchart for explaining the operation of the adaptive bit allocation unit in FIG.

Claims (5)

A quantizer 4 for inputting and quantizing a signal obtained by dividing a predetermined length block of the signal into a plurality of divided bands N and a multiplexer 5 for sequentially transmitting the quantized band-divided signal to a channel In order to encode a video or audio digital signal, including the band-divided signals from the band-dividing pattern 1, the power values required for encoding the band-divided signals are provided. i], i = 0, ... N-1), the signal-to-noise ratio calculation section 3, the number of bits (T) available for the predetermined length block of the signal, and the quantizer 4 The signal-to-noise ratio (SNR [j], j = 0, ..., M-1) is stored for each number of bits per sample, and the power value (pow [i], i = 0 from the signal-to-noise ratio calculation section 3 is stored. ,... N-1) to obtain the number of bits per sample of the quantizer 4 for each of the divided bands. An adaptive bit allocation unit (6) for adaptively selecting, wherein N and M are positive integers. 2. The signal block according to claim 1, wherein the adaptive bit allocation unit (6) includes the number of bits per sample (i, i = 0, ..., M-1) included in the quantizer (4). And a specialty table having respective band bits determined by the size of the partition and the predetermined number of divided bands (N). 3. The adaptive bit allocation unit (6) according to claim 2, wherein the adaptation bit allocation section (6) is configured for the signal-to-noise ratio (SNR [j]) for the number of bits per sample at the respective power values (pow [i], i = 0, ... N-1). calculate the deviation (D [j], j = 0, ..., M-1) by subtracting, j = 0, ..., M-1), obtain a preset index as the deviation, A band division encoding apparatus for classifying a pattern based on set criteria. 4. The first index of claim 3, wherein the index is the number of bits per first sample k ₁ of the deviation having the smallest absolute value among the deviations D [0] to D [M-1]. INDEX1 [i]) and the deviation (D [0] to D [M-1]) can be the first two bits per sample of the smallest the difference the things that are of larger than 0 (k ₂₎ of the second index (INDEX2 [I]) and a third index of the number of bits per third sample k ₃ of the deviation having the largest absolute value among the deviations D [0] to D [M-1] that are smaller than zero. (INDEX3 [i]) and, with the first number of bits per sample may fourth bit per sample by subtracting 1 from the (k ₂₎ of the fourth index (INDEX4 [i]) (k ₂ -1), wherein 3 may be a fifth bit bits per sample plus one from the (k ₃₎ per sample band split encoding apparatus including a fifth index (INDEX5 [i]) (k ₃ +1). The method according to claim 4, wherein the panel is determined in relation to the first to fifth total number of bits AMOUNT1 to AMOUNT5 determined by the first to fifth indexes, and the maximum bit B assignable to the block. Band Division Coding Apparatus. ※ Note: The disclosure is based on the initial application.