Brazil adopted ISDB-T transmission system. Brazil transmission system is same as Japanese system except transmission spectrum mask and receiver IF frequency.
For other area, Brazil adopts MPEG-4 as video coding system, and also adopts GINGA, Brazilian data casting system, which had been developed by Brazil.
For handheld service named “One-seg”, field frequency is different. In addition, the SBR (Spectral Band Replication) is available for audio coding in Brazil.

In case of ISDB-T system, it is slightly complicate to calculate bit rate because hierarchical transmission is possible.
An example of bit rate for fixed reception and mobile/ handheld reception
HD fixed reception + One-seg service in one 6MHz bandwidth
(a) HD service for fixe reception: 12segment, 64QAM, r=3/4, bit rate=16.85 Mbps
(b) One-seg service for portable reception: 1 segment, QPSK, r=2/3, bit rate=416 kbps

• For the calculation procedure of bit rate of ISDB-T are written on following document.

In generally, digital communication system adopts error correction system with interleave technology. The error correction system shows best performance in case of random error pattern.
Time interleave technology is adopted to randomize many degradation factors, such as man-made noise, multi-path fading, interference to get best error correction process.
In this respect, time interleave technology is very effective to improve receiving performance and it much contribute to the realization for mobile/ portable reception and indoor fixed reception.

• See, for details

Because ATSC adopts single carrier system, it is quite difficult for ATSC to work in SFN.
On the other hand, ISDB-T and DVB-T adopt multi-carrier system, named OFDM, therefore, basically both systems can work in SFN.
DVB-T does not adopt a time interleave technology, therefore, mobile/ indoor reception performance of DVB-T is inferior to that of ISDB-T in SFN.

Yes, each segment composing ISDB-T signal has same band-width/number of carrier/carrier spacing. (note)
(note) the number of carrier/channel spacing is different depends on “mode”, but these parameters of each segment are same.

• See, for details

Japan adopts MPEG2-AAC and Brazil adopts MPEG4-AAC for audio coding system respectively. These coding systems support monaural, stereo, multi-channel stereo, dual and multi-audio service.
This is the reason for supporting multi-lingual service in ISDB-T system.

Both Japan and Brazil digital broadcasting system support both HD and Multi-SD service.
If your country adopt ISDB-T based on Japan/Brazil system, you can enjoy select any of HD, Multi-SD or compound service of HD/SD. In case of DVB-T system, many countries adopt Multi-SD service only.

ISDB-T adopts MPEG-2 systems for service multiplexing system. The number of service in a channel should be decided as a operational guideline considering a trade off of service request and service quality.
In Japan, broadcasting companies usually provide One HD program and sometimes up to 3 SD programs.

The most important factor for STB price is its performance, especially video coding system and input/output video format.
The following table shows a segmentation of STB performance.

The Cheapest type in above table is case (a), the most expensive type is case (f). In Japan, digital terrestrial service is provided in the format of both HD and Multi-SD, therefore, current STB in market is case (e).
It is said that STB price depends on transmission system, such as DVB-T, ISDB-T, ATSC. However, this is not correct but just misunderstanding. Because the difference of STB hardware based on transmission system is very small part, this factor does not influences to STB price.
The market size is also an considerable factor on STB price. However, It is expected that when the size of the market is over 1 million, the STB price is not much affected by that of the market. Nowadays, any of transmission system (ISDB-T,DVB-T, ATSC) has larger market than 1 million, therefore, market size is not so important factor on STB price.

The STB, for ISDB-T system, both Japan and Brazil, has a function to receive/decode any both HDTV and SDTV.